Search

Copyright of Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) 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.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering 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.)

Copyright of Rock & Mineral Analysis is the property of Editorial Board of Rock & Mineral Analysis 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.)

BACKGROUND: The main types of copper deposits are porphyry and skam types. Dacite porphyry is a rock type commonly developed in the porphyry Cu - Mo - Au system. The rock can be used for prospecting sign and ore - forming rock when there is well - developed hydrothermal alteration. The Dabaoshan deposit is currently the largest copper polymetallic deposit in South China Block. Previous studies have shown that the dacite porphyry of the mining area is not only the ore - forming parent rock, but also a favorable ore - bearing wall rock. However, there are some debates about the relationship between dacite porphyry and mineralization in this mining area. With the breakthrough of prospecting for medium and large dacite porphyry ore bodies in recent years, the relationship between dacite porphyry and mineralization has once again become a concern. OBJECTIVES : In order to understand the relationship between dacite porphyry alteration and mineralization of the Dabaoshan deposit. METHODS: Based on field work and indoor analysis, this paper uses X - ray fluorescence spectrometry ( XRF) and inductively coupled plasma - mass spectrometry ( ICP - MS) to determine copper, tungsten, silicon, aluminum and calcium in Dabaoshan dacite porphyry samples. The isotope composition, metal element contents and alteration characteristics of the dacite porphyry in the mining area were used to discuss the relationship between alteration and prospecting direction. RESULTS: The copper content changes from 107 to 6909 µg/ g, which is consistent with the copper ore grade of 0. 3% - 0. 5% in the mining area. The LOI and other geochemical indicators that can represent the degree of alteration are positively correlated with copper. Hydrothermal alteration is widely developed in dacite porphyry, including potassium, prophyliticition and quartz - sericitization from early to late stage. Among different stages of alterations, the copper content of quartz - sericitization is 2 to 5 times higher than other alteration types, indicating that quartz - sericitization is closely related to copper mineralization and is an important prospecting sign. CONCLUSIONS: The deep alteration intensity of the dacite porphyry ( below the 270m elevation) has not been weakened, suggesting a great prospecting potential. In addition, the contact zone between dacite porphyry and the Jurassic strata, and the xenoliths in the dacite porphyry are also important prospecting directions, which may host skarn - type copper - rich deposits. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Computer Engineering & Applications is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. 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.)