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The lack of mineralization research on metamorphic rocks in Java, especially in the Jiwo area, is part of the research interest. The host rock of ore mineralization in the Jiwo area is Cretaceous metamorphic rock located in the hilly area of Jiwo, Klaten, Central Java. The presence of chlorite, actinolite, quartz, epidote, and garnet minerals indicates the metamorphic facies of greenschist. Meanwhile, the presence of glaucophane, quartz, and epidot minerals is a metamorphic facies of blueschist. The metamorphic rock research method was carried out in several stages: 1. Observation; 2. Field data collection, including mapping of metamorphic rock distribution, general geological conditions and rock sampling; and 3. Laboratory analysis. Laboratory analysis testing consists of petrography, ore microscopy, geochemistry (AAS), and fluid inclusion. Alterations that develop in the researched area are in the form of propylitic (chlorite, calcite, epidote), argillic, and silicification (quartz, graphite, calcite, carbonate minerals). Ore microscopy analysis has identified the presence of mineral sulfide such as pyrite, chalcopyrite, bornite, galena, and covellite. In addition, galena was found covered with chalcopyrite. Based on AAS analysis on mineralized metamorphic rocks, Au levels are 0.001 - 0.008 g/t, Ag 0.1 - 2.4 g/t, Cu 4 - 75 g/t, Zn 14 - 166 g/t, and Pb 11 - 60 g/t. The inclusion of fluid from the discordant vein was obtained with a homogenization temperature (Th) of 312 - 435 0C, with a salinity of 1.95 - 5.05 wt. % eq. with isothermal mixing and heating depressurization conditions. The isothermal mixing process is a mixture of meteoric fluids and metamorphic fluids. Meanwhile, heating depressurization occurs during subduction, so that the temperature is relatively high. The homogenization temperature (Th) of the concordant vein ranges from 168.5 - 296.55 °C, with a salinity of 1.95 -12.6 wt% NaCl eq. A salinity of 12 wt% NaCl is formed due to liquids that are aquos trapped at high pressure and temperature conditions and the devolatilization process that occurs during subduction. Based on the plotting of the homogenization temperature range and the salinity of fluid inclusion, which is 168.5 - 4350C and 1.95 - 12.6 wt% NaCl eq, the type of deposits in the study area is in the range of Au lode or orogenic deposits. The existence of two homogenization clusters in the Jiwo Hill is estimated to be part of the process of forming the blueschist facies with greenschist which is shown in the retrograde actinolite in the glaucophane epidote schist rock which is part of the blueschist facies. [ABSTRACT FROM AUTHOR]

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By summarizing the metallogenic regularity of gold deposits in Jilin Province, the study provides a new reference for gold prospecting in the area. Based on the metallogenic series theory and method, the main gold deposits in Jilin are assigned to 6 metallogenic series, including 11 metallogenic subseries with 19 deposit types. Combined with the development history of regional tectonics in Jilin, the paper discusses the spatiotemporal evolution rule of gold metallogenesis, and establishes the regional metallogenic pedigree of gold deposits. The results show that the formation of gold deposits in Jilin is unbalanced in time and space, with the most important gold mineralization period in Yanshanian, followed by Wutaian, Zhongtiao, Variscan and Indosinian periods, and the most significant gold metallogenic belt of Jiapigou metallogenic belt, followed by Ji'an-Laoling, central Jilin, and Yanbian metallogenic belts. [ABSTRACT FROM AUTHOR]

Gold is one of the dominant minerals in eastern Jilin and Heilongjiang provinces, with abundant resources and multiple types. Through systematic collection and sorting of the existing geological data of gold deposits, the paper comprehensively summarizes the resources endowment, deposit types, ore-controlling factors, spatiotemporal distribution rule, metallogenic evolution and resources potential of gold deposits in eastern Jilin and Heilongjiang provinces. The gold deposits in the area can be classified into 6 genetic types, with 48 main prediction types in 5 metallogenic periods. The gold deposits are mainly occurred in such tectonic units as active continental margin and island (volcanic) arc which have experienced multistage tectonic movements and frequent magmatic activities, especially the Variscan-Yanshanian large-scale tectonic and magmatic activities are important controlling factors for gold deposit formation. By summarizing the above results, 34 important prospecting potential areas for gold deposits are identified in the study area, and the gold resources potential and prospecting direction are defined. It is proposed the way to achieve prospecting breakthrough by strengthening exploration in key prospective areas and beneath and around the known gold deposits. [ABSTRACT FROM AUTHOR]

Since the Cenozoic, Qaidam Basin has developed a complex tectonic system and a series of relatively independent tectonic and metallogenic units. Within specific spatiotemporal ranges including the shallow salt lake area in Quaternary, the alluvial-proluvial fan area in Pleistocene, and the trap structural area of Paleogene-Neogene, the different tectonic units in Qaidam Basin have brought minerals with relatively unique occurrence statuses and mineral compositions because of variations in the sedimentary environment and metallogenic conditions. The inductive research on the spatiotemporal distribution characteristics, mineralization, and metallogenic geological background of basin salts and groundwater resources, along with the classification of metallogenic series for basin salt and groundwater mineral deposits, holds great significance in guiding future exploration, ore prospecting, and resource development and utilization, as well as ensuring the smooth construction of a world-class salt lake industrial base. Guided by the metallogenic series theory, the basin evolution, salt metallogenic units, spatiotemporal distribution of mineral resources, and metallogenic types are systematically collated based on the latest exploration and research findings on Qaidam Basin. As a result, the salt and groundwater mineral deposits in Qaidam Basin are classified into three metallogenic series, six metallogenic sub-series, and fifteen ore deposit types. Moreover, utilizing the natural classification of deposits and the predictive mindset of inevitable mineralization in certain spatiotemporal dimensions and prospecting/research of unexplored or unpredicted deposits, the effective prospecting directions for salt and groundwater mineral deposits in Qaidam Basin are presented. [ABSTRACT FROM AUTHOR]

With the adjustment of China's economic structure and industrial transformation and upgrading, kaolin, included in 15 kinds of minerals, has been suggested to be strategic non-metallic minerals in China. Therefore, it is urgent to study the types and causes of kaolin mineral resources. A new genetic classification scheme of kaolin deposits in China was proposed based on the research results on the genesis of kaolin(rock)deposits and the compound naming principle of parent rock type(or source of ore-forming original material)+ formation + ore type. Kaolin deposits can be divided into 4 genetic types, 8 genetic subtypes and 12 deposit types. On the basis of the existing 6 ore deposit types, 6 new types of ore deposits are proposed, including 3 subtypes of weathered eluvial kaolin ore deposits, which are the weathered eluvial subtype knag soil deposits, rich long sand(rock)weathered eluvial and molding sand quality kaolin ore deposit, and kaolin rocks weathered eluvial subtype aluminum water stone-halloysite-kaolin ore deposit. The origin of hard clay, soft clay and semi-soft clay in refractory clay deposits is attributed to terrigenous clastic and colloidal chemical sedimentary diagenetic subtype kaolin(soil)deposits. For the Carboniferous-Permian coal-bearing rock series in North China, part of coal seam gangue and roof and floor kaolin rocks are formed by descending pyroclastic sedimentary diagenesis. This type of kaolin rocks is unique to China and is classified as descending pyroclastic sedimentary diagenesis subtype. In addition, the variable kaolin subtype deposit is a special type of deposit, and the(thermal)fluid alteration subtype sandstone kaolin deposit is rare, but it is a kaolin deposit with potential economic value. [ABSTRACT FROM AUTHOR]

Based on results of geological survey and mineral resources research over the past decades, the authors have systematically summarized the metallogenic geologic settings of Laos, Cambodia, Vietnam, Thailand, Myanmar, Malaysia, Indonesia, and the Philippines in Southeast Asia. Mineral geological database has been established, regional geological maps, geotectonic units with division maps, magmatic rock distribution maps and metallogenic regularities of some important metallogenic belts in Southeast Asia have been compiled. The distribution characteristics of major minerals such as copper, gold, aluminum, potassium, nickel, chromium, tungsten and tin, lead and zinc, iron, manganese and antimony, and the genetic types of these minerals are summarized. Meanwhile, twenty metallogenic belts are divided and nine main metallogenic epochs are summarized. We also analyze the influence of the tectonic evolution of the East Tethys, as well as the subduction and collision between the Indian-Australian plate, the Pacific plate, the Philippine sub-plate and the Eurasian plate on the mineralization in Southeast Asia. This study provides a number of valuable data and geological information for understanding the spatial distribution and temporal evolution of minerals, and the prospecting targets in Southeast Asia.

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Copyright of World Nuclear Geoscience is the property of World Nuclear Geoscience Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

By the end of 2020, 83 silver deposits (or ore occurrences), including four super-large-scale deposits, nine large-scale deposits, 33 medium-scale deposits and 37 small-scale deposits or ore occurrences, have been proved. The amount of silver metal exceeds 86000 t with average grade of 100 g/t, which makes Daxing’ anling region one of the the most important silver ore belt in China. However, the metallogenic characteristics and metallogenesis need to be clarified. The silver deposits in the study area are classified into three main types, which are magmatic hydrothermal vein type, continental volcano-subvolcanic type and skarn type, respectively. The supergiant deposits include the Shuangjianzishan deposit (silver metal amount of 15214 t with average grade of 138 g/t), the Baiyinchagandongshan deposit (silver metal amount of 9446 t with average grade of 187 g/t), the Huaobaote deposit (silver metal amount of 6852 t with average grade of 170 g/t), and the Fuxingtun deposit (silver metal amount of 5240 t with average grade of 196 g/t). The silver deposits are mainly distributed in the central and south of the Daxing’anling area, and mainly formed in the Yanshanian period. The silver polymetallic deposits in the Daxinganling area are significantly controlled by regional faults and the junction zone of volcanic rock basins and their margins. The north-east trending deep faults are the most important ore-controlling structures in this area. The distribution of silver polymetallic deposits along the main faults is obvious, and the intersection area of multiple groups of faults often form important mine catchments. The Permian is the most important ore-bearing formation in this area, but some important silver polymetallic deposits occur in Mesozoic volcanic basins or pre-Mesozoic strata. The magmatic rocks related to mineralization are mainly intermediate acidic or acidic intrusions, intermediate acidic lavas, pyroclastic rocks, and small intrusions of ultra-shallow or shallow facies of the Yanshanian Period. The mineralization element combination is mainly determined by the elemental geochemical background of surrounding rocks or source layers. In addition, the type of deposit, the distance from the mineralization center, and the degree of differentiation of ore-forming rock mass are also important influence factors. The article analyzes the prospecting prospects of each silver deposit type in the study area, discusses the relationship between mineralization center and deep prospecting, and proposes that porphyry silver deposits should be paid attention to. In the prospecting and exploration of silver deposits, comprehensive evaluation and multi-target prospecting need to be strengthened because silver can coexist or be associated with a variety of metals.©2022 China Geology Editorial Office.

China is rich in abundant lithium resources characterized by considerable reserves and a concentrated distribution of metallogenic zones or belts, with proven reserves of 4046.8×103 t (calculated based on Li2O) by 2021. China is also a big consumer of lithium. By 2019, China ’s lithium consumption in the battery sector alone had reached 99×103 t, with an average annual growth rate of nearly 26%. China has become the world ’s largest importer of lithium resources, showing a severely unbalanced relationship between supply and demand for lithium resources. Therefore, there is an urgent need for the prospecting, exploitation, and study of lithium resources in China. This study collected, organized, and summarized the data on the major lithium deposits in China, analyzed and compared the spatial-temporal distribution patterns, geological characteristics, and metallogenic regularity of these lithium deposits, and summarized the prospecting and research achievements over the last decade. The major lithium deposits in China are distributed in provinces and regions such as Qinghai, Jiangxi, Sichuan, Tibet, and Xinjiang. These deposits are mostly small in scale. According to different genetic types, this study divided lithium deposits into granitic pegmatite type, granite type, saline lake brine type, underground brine type, and sedimentary type, as well as new types including hot spring type and magmatic-hydrothermal type, and summarized the characteristics and key metallogenic factors of these different types of deposits. Sixteen metallogenic prospect areas of lithium deposits were delineated according to the deposit types and the distribution patterns of metallogenic belts. The paper introduced the research progress in major metallogenic models and lithium extraction techniques made over the past decade. Based on the comprehensive analysis of the prospecting potential of lithium deposits, the authors concluded that the future prospecting of lithium resources in China should focus on lithium metallogenic belts, the deep and peripheral areas of currently determined large-scale pegmatite-type lithium deposits, geophysical-geochemical anomalous areas with mineralization clues, and areas with developed large-scale low-grade associated granite-type and sedimentary lithium resources. The study aims to serve as a guide for the future prospecting of lithium deposits in China.©2022 China Geology Editorial Office.

East Tianshan metallogenic belt, which is one of the important metallogenic belts in China, is characterized by large-scale mineralization during Paleozoic. In recent years, a number of Indosinian age data have been reported in East Tianshan metallogenic belt, which have attracted a lot of attention. The geological characteristics, genetic types and metallogenic regularity of Indosinian deposits in East Tianshan were summarized. The results show that Indosinian deposits in East Tianshan contain not only large-superlarge scale Au, Mo, W, Re, and Rb deposits, but also Li, Be, Nb, Ta, V, Ti, Fe and other metal deposits, indicating the importance of Indosinian mineralization in East Tianshan. The genetic types of Indosinian deposits include magmatic deposits, i.e., magmatic V-Ti magnetite deposit, granite-type Rb deposit and pegmatite-type Li-Be-Nb-Ta deposit, and hydrothermal deposits, i.e., porphyry-type Mo-Re deposit, skarn-type W-Mo-Rb deposit, quartz vein-type W deposit, orogenic-type and epithermal-type Au deposits. Indosinian deposits in East Tianshan are mainly distributed in Kanggu'er ductile shear zone, Central Tianshan terrane, and their southeastern margin, but there is little metallogenic information in other tectonic units. The distribution of Indosinian deposits is similar in time and space, but the key ore-controlling factors are obviously different. Skarn-type W deposit is obviously controlled by Precambrian basement of Central Tianshan terrane; V-Ti magnetite deposit, granite-type Rb deposit, pegmatite-type Li-Be-Nb-Ta deposit and porphyry-type Mo deposit are controlled by different intrusive rocks; and orogenic-type Au deposit is obviously controlled by ductile shear zone and fault structure. Therefore, the resource potential of Indosinian orogeny in East Tianshan has been preliminarily shown, and more attention should be paid to the study on Indosinian mineralization and ore exploration in East Tianshan and even Xinjiang in the future. [ABSTRACT FROM AUTHOR]

This article reviews information from published papers and studies by the authors about placer diamond deposits. Original data were obtained in result of field and laboratory-analytical work carried out in various countries of Africa and South America. The main types of placer diamond deposits - fluvial, fluvioglacial, eolian, and man-made - have been considered and characterized. The main attention is given to fluvial continental placers, which are the most diverse, well-studied and have the greatest industrial importance. Primary, secondary and mixed deposits are distinguished according to the method of feeding; short, moderate and long transport deposits - according to the distance of the diamond-bearing material movement. It is noted that although the short transport placers (deluvial-proluvial and beds of short watercourses) have not industrial value, they are very informative for the searching for root sources. It is important to reliably diagnose these deposits by lithological-facies and mineralogical features during prospecting works. The concepts about the conditions for the formation of diamond placers in various landscape and geological conditions are developed and clarified. Alluvial-proluvial-lacustrine and proluvial-lacustrine types of placers studied in Yakutia and Brazil are characterized in detail. Their characteristic feature is that their productive strata, being re-deposited products of crustal weathering, themselves underwent a hypergenic change at the place of occurrence, which significantly masks the primary conditions of formation. Continental alluvial redeposition and long transport placers, as well as marine, yield the most high-quality expensive diamonds, the average value of which can reach $300-400 per carat. Often, such placers are formed due to the erosion of ancient Proterozoic placers, which belong to the category of fossils. The article summarizes the genetic and morphological types of diamond placers in the form of a principle diagram of the distribution of sedimentary reservoirs of kimberlite minerals. The landscape-dynamic zones of sedimentation are highlighted. A classification scheme of sedimentary reservoirs containing diamond placers has been developed. Continental, transitional and marine environments are distinguished, with further detalization of sedimentation environments - peneplain, alluvial-lacustrine accumulative plain, alluvial-deltaic plain and shelf zones of sea basins. It is shown that the formation of valley placers, their internal structure, thickness, granulometric composition and diamond content of alluvium are influenced by the dynamic phases of the formation of annual valleys. Visualization of the mutual relationship of different morpho-genetic types of placer diamond deposits is given. [ABSTRACT FROM AUTHOR]

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The Dalong tin deposit, located in the Luziyuan polymetallic ore field of the southern Baoshan block, Southwest China, is composed of lenticular and bedded orebodies hosted in a Cambrian slate-marble sequence. As the only tin deposit in the orefield, the genesis of the Dalong deposit is of great significance to the understanding of regional metallogenic regularity. Based on a systematic field survey and petrographic observation, EPMA and LA-ICP-MS major/trace element analyses of cassiterite were carried out in this study. The enrichment of Fe, W, and Ti in cassiterite, as well as the depletion of Nb, Ta, and Mn, reveal cassiterite's features in granitic magmatic-hydrothermal deposits. The Dalong deposit can be categorized as a magmatic-hydrothermal vein-type deposit because of its sulfur isotopic properties, and the main sources of ore-forming fluid and minerals are thought to be buried intermediate-acid intrusions in the mining area's depths. [ABSTRACT FROM AUTHOR]

The northern Qaidam metallogenic belt in Qinghai province has superior metallogenic conditions, and is the continuation of national important mineral resources only second to East Kunlun metallogenic belt. Gold, lead, zinc, coal, asbestos, limestone, boron and other important minerals in the metallogenic belt are mainly distributed in Tanjianshan magmatic arc (IV 24-2 Xitieshan-Buguoteshan Pb-Zn-Au-Cu-Mn-coal-salt metallogenic sub-belt), Oulongbrooke block (IV 24-3 Dameigou Coal-U-clay metallogenic sub-belt) and the ophiolitic melange belt in the northern matrgin of Qaidam Basin (IV 24-5 Luliangshan-A'ercituoshan Pb-Zn-Au-Mn-Cr-Fe-W-rare metal-rutile-limestone-clay metallogenic sub-belt). The spatial distribution of mineralresources shows that the occurence of Tanjianshan magmatic arc is represented by magmatic hydrothermal Qinglonggou-type Au deposit and marine volcanic Xitieshan-type Pb-Zn deposit, while the ophiolitic melange belt in the northern margin of Qaidam Basin is mainly characterized by contact metamsomatic polymetallic deposits related to Indosinian intermediate acid intrusive rocks. With crystalline basement in Pre-Nanhua Period (2.50-0.78 Ga), continental breakup collision orogeny in Nanhua Period-Devonian (780.0-359.6 Ma), Paleotethyan ocean evolution in Carboniferous-Triassic (359.6-199.6 Ma), intracontinental evolution in Jurassic-Cretaceous (199.6-65.5 Ma) and plateau uplift in Cenozoic (65.5-0 Ma), the evolution of metallogenic geological structure environment has formed endogenetic minerals dominated by marine volcanic rock type of Pb, Zn and Mn and magmatic chromium and metamorphic type of quartzite, and exogenous minerals dominated by biochemical sedimentary type of coal,chemical sedimentary type of limestone and evaporative sedimentary type of salt lake. The genetic types of 53 minerals in the study area mainly belong to the deposits with magmatism and sedimentation, and the metallogenic epochs are mainly Early Paleozoic and Mesozoic, and secondly Late Paleozoic and Quaternary. Based on the geological tectonic evolution and metallogenic temporal-spatial characterictics, according to the theory of metallogenic sub-series and 23 metallogenic types in the northern margin of Qaidam Basin were determined. The relationshio between major tectonic activities and key metallogenic events in Early Paleozoic and Early Mesozoic was analyzed, and the constraints of structure on mineralization from the perspective of regional geological evolution were discussed. It is considered that the structural environment controls the types of deposits and metallogenesis intensity [ABSTRACT FROM AUTHOR]

ABSTRACT: Fluorite is one of the important mineral raw materials in the industry. In China, it is mainly distributed in the provinces and regions such as Hunan, Zhejiang, Jiangxi, Inner Mongolia, Fujian, and Henan provinces, boasting huge reserves and large numbers of deposits. However, most of the fluorite deposits are on a small or medium scale. The main fluorite deposits in China were studied in this paper. Their geological features and metallogenic regularity were summarized and compared. Meanwhile, based on their main genetic factors including metallogenic fluid sources and main metallogenic geological processes, they were divided into two groups, namely meso-epithermal deposits and magmatic-hydrothermal deposits. Furthermore, based on the prospecting achievements and research progress obtained in fluorite deposits in recent years, prospecting potential predictions were made for the metallogenic prospect areas and major prospecting areas of fluorite in China. This aims to provide a theoretical basis and direction for future fluorite prospecting in China.

In this paper, based on the analysis of 1572 small and above-scale gold deposits in China, the gold deposits are divided into four types for prediction purposes: sedimentary, volcanic rock, magmatic hydrothermal and shear zone types. The spatial and temporal distribution of gold deposits in China is non–uniform, as 60% of the deposits are distributed in the land block and Mesozoic deposits account for 71.5% of the national total. It is found that intrusive and sub-volcanic rocks are the main ore–forming geological bodies. Here, the method for accurately identifying the spatial positions of concealed rocks is summarized. Through the geological profile study of 450 representative gold deposits, this paper suggests that there are mainly two kinds of gold deposits in China. One is characterized as an association of Au and Ag, with formation temperatures of approximately 250°C; it has very low concentrations of As and Sb. The fineness of the gold is generally below 900. Unequal proportions of K–feldsparization and albitization formed in the early stage. The other is an association of Au, As and Sb with a formation temperature below 250°C; the fineness of the gold is generally higher than 900; it has low Ag and high As and Sb concentrations. Alterations were mainly in the form of silicon with some secondary quartz formed in the early mineralization stage. Taking into account the elemental geochemical characteristics, the mechanism of gold migration and precipitation in the transient transition process from fluid to solid minerals in the ore-forming structure is discussed. The discussion provides a reference for future gold prospecting. [ABSTRACT FROM AUTHOR]

Copyright of Bartin University Journal of Faculty of Economics & Administrative Sciences / Bartın Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi is the property of Bartin University, Faculty of Economics & Administrative Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on the studies of the geological evolution, field investigation of the ore-bearing rock series, zircon U-Pb isotope chronology and typical iron ore deposits of Taxkorgan Block in West Kunlun, the characteristics and forming ages of regional ore-bearing formation, ore deposit type and metallogenic regularity were summarized. The results show that the previously defined “Bulunkuole Group” actually contains Paleoproterozoic (2 100-2 500 Ma) and Early Cambrian (510-540 Ma) sedimentary metallogenic events, which are suffered to the intensely metamorphism and deformation in both Middle-Late Proterozoic (800-1 800 Ma) and Hercynian-Indosinian (200-410 Ma). Moreover, the genesis of the local high-grade ores may be related to the later hydrothermal activities. The regional iron deposits can be divided into two types. The first one is the meta-sedimentary type iron deposit that is superimposed and transformed by the later hydrothermal fluids; taking Zankan, Mokaer and Jiertiekegou as examples, they form in weakly oxic to reducing marine sedimentary environment of Early Proterozoic active continental margin and the metallogenetic materials are derived from the leaching of basic volcanic rocks by seafloor hydrothermal fluids and a small amount of terrigenous sediments input. The second type is the Early Cambrian marine volcanic exhalative sedimentary iron deposit, such as Kalaizi, Laobing and Yeleke sulfate-iron deposit; their depositional environment should be bathyal-neritic facies weakly oxic to suboxic faulted basin; and the ore-forming materials come from the submarine hydrothermal sedimentary and terrigenous materials input. According to the regional metallogenic regularity, it is speculated that Kalaben-Kalaizi-Molahe belt is the favorable area for prospecting the iron-polymetallic deposits, which associate with the Early Cambrian marine exhalative metallogenic system. While, Jiertiekegou-Zankanbei area, Mokaer and its southern area, which are the northward and southward extensional zones of Zankan iron ore belt, are both the favorable areas for prospecting the meta-sedimentary type of Paleoproterozoic iron deposits. [ABSTRACT FROM AUTHOR]

Among the abundant aluminum ore resources in China, bauxite is dominated, which is mainly distributed in 19 provinces and regions, including Shanxi, Henan, Guizhou and Guangxi. The major deposit type of bauxite is paleo-weathering crust sedimentary type, and the other one is the accumulation type. The main metallogenic period is the late Paleozoic Era followed by the Cenozoic Era. The metallogenic tectonic background is characterized by a cratonic environment. This paper summarizes the bauxite metallogenic regularity based on the characteristics of bauxite resources, bauxite deposit type, bauxite metallogenic belt and metallogenic series in China, and 15 bauxite metallogenic belts, 8 bauxite metallogenic series and 7 bauxite ore concentrated areas were identified in the study. This paper also provides a theoretical basis for the evaluation of the potential of bauxite resources. [ABSTRACT FROM AUTHOR]

Lead and zinc resources are abundant in China, with the reserves of 100 million tons ranking only second in the world. There are more than 3000 lead-zinc mine areas nationwide. The classification of lead-zinc (Pb-Zn) deposits has been a highly controversial issue. From the standpoint of evaluating the potential of mineral resources, we construct a Pb-Zn deposit predictive type of classification scheme, and propose a Pb-Zn deposit comprehensive classification scheme (including 5 classes and 13 sub-types) that regards mineralization as the primary factor and the ore rock as secondary. According to the temporal and spatial distribution of Pb-Zn deposits, we conclude that a multi-period, multi-cycle orogenic environment is the most favorable for lead-zinc deposit growth, that the Proterozoic is the major eon for the growth of igneous-type deposits, the Paleozoic is an important development era for sedimentary Pb-Zn deposits, and the Mesozoic and Cenozoic are the heyday eras of magmatic type lead-zinc deposits. On this basis, we analyse the relationship between tectonic evolution and Pb-Zn metallogenic, and propose that the key factors determining geological mineralization are the metallogenic epoch of mineralization and tectonic environment, which determine the temporal and spatial distribution. [ABSTRACT FROM AUTHOR]

[Display omitted] • The Early, middle and late Yanshanian mineralization was related to the flat subduction, mantle melting plume and trench retreat, respectively. The connection between the Mesozoic metallogenic explosion and the tectonic evolution in the Western Pacific Continental Margin (WPCM) is a frontier theme of research. The wide-scale mineralization is the product of an extensive tectono-magmatic-hydrothermal event where the distribution of mineral deposit types is linked to the geodynamic evolution of the region. The rock associations and ore deposits of Zhejiang Province provide a window into processes of ocean slab subduction, continental marginal magmatism, generation of magmas and fluids, and mineralization in the WPCM. Based on a comparative analysis of the geochemistry, genetic type and metallogenic characteristics of the mineral deposits, we evaluate the relationship between shallow mineralization and deep dynamic processes of the WPCM in the Yanshanian Period (~165–80 Ma). The early Yanshanian mineral deposit types comprise mainly skarn Fe deposits and mesothermal Pb-Zn deposits, and the magmas responsible for metallognesis originate from continental crust and depleted mantle, produced by flat subduction of the Pacific Plate and the foundering of the subducted oceanic slab. Porphyry Mo deposits are the main deposit type of the mid-Yanshanian, and the mineralized intrusions were derived from melting of old continental crust and mixing within mantle-derived magmas produced by destruction and thinning of the lithospheric mantle by mantle melting above a steep subduction zone. The late Yanshanian deposit types are mainly greisen W-Sn deposits, and the magmas producing this style of mineralization originated from small volumes of mantle-derived magmas produced during eastward retreat of the subduction-related trench. [ABSTRACT FROM AUTHOR]