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Zhuxi W-Cu deposit in northern Jiangxi Province is a recently found super large skarn W deposit. The formation of this deposit is closely related to granitic intrusions. The mining area is located in the central Jiangxi Taqian-Fuchun ore belt in Qin(zhou)-Hang(zhou) joint zone. The discovery of this deposit is further evidence for the model of the Southern tungsten North expansion. However, due to the lack of systematic geochemistry and geochronology of ore-related intrusions, the knowledge of this model is limited. Ore-related fine-grained muscovite granite was chosen as the research object for the study reported on in this paper. LA-ICP-MS zircon U-Pb dating of granite yielded a 206Pb/238U weighted average age of 146.90±0.97 Ma (MSWD=0.55). These granitic rocks have high silicon, alkali and potassium, and are strongly peraluminous, which belongs to the typical S-type granite. This study has indicated that ore-related magmatism occurred at the late Jurassic in Jiangnan uplift and provides new evidence for the genesis of Zhuxi W-Cu deposit and metallogenic regularity of the Taqian-Fuchun metallogenic belt.

A new tungsten-copper deposit with large-super mineralization potential was recently discovered in the Zhuxi area, Jingdezhen city of Jiangxi Province. The primary halo research plays a very important guiding role in further exploration work. By using Polarized Energy Dispersive X-ray Fluorescence Spectrometry, Inductively Coupled Plasma-Mass Spectrometry/Atomic Emission Spectrometry, large amounts of sample analyses have been conducted. According to the contents of elements W, Sn, Bi, Mo, Pb, Zn, Cu, As, Sb and Ag, these are served as the indicators of the primary halo. The primary halo of Zhuxi tungsten-copper deposit shows that Cu, Zn, Ag and Pb have good correlation as well as W, Bi, Sn and Mo. W is also correlated with Cu. The ore-forming elements have some characteristics in space. In the same section, high temperature elements such as W are more enriched at the northwest, whereas in the plane, this performance appeared at the southwest. Overall, W-oriented high-temperature elements are more enriched at lower depths. By comparison, Cu-oriented middle-temperature elements are shallower than W. This study indicates that the Cu deposit is distributed in the medium deep part (-1400--1500 m), W deposit in the deep part (-1400--1900 m) and Ag, As, Sb at the surface (-1100--1200 m). This study provides a theoretical basis for mineralization forecast and further exploration.

It is a fatal challenge to the traditional cognition, which the W and Cu deposits distribute in the south and north regions of Jiangxi Province respectively, when the super Cu-W deposit in Zhuxi area was discovered recently, which attracts domestic researchers' attention and their interests in restudying geology of Taqian-Fuchun metallogenic belt in Zhuxi area that provides pivotal proofs for phenomenon of the south W deposit extends to the north region of the area. The recent discovery of the super Cu-W deposit in the Zhuxi area of northeast Jiangxi has challenged the belief that W and Cu deposits are distributed in the south and north regions of the province respectively and has led to a renewed interest in analyzing these areas again. The metallogenesis types in the Taqian-Fuchun metallogenic belt are complicated with multiple ores. For instance, Cu, W, Mo and Au are related to various igneous rocks, with some diagenesis. To address geological issues, such as the tectonic evolutional setting and ore material origins, which need to be solved urgently, the zircon U-Pb isotopic method of LA-ICP-MS was utilized and is reported in this paper in order to date the ore-related magmatic rocks. The results show that there were at least three periods of magmatism and two stages of metallogenesis in the belt. The three periods of magmatism include 850 Ma and 160 Ma granodiorites and for the lamprophyre veins, 146 Ma granites. Two stages of metallogenesis are the Taqian skarn-type W-Mo deposit and the Yuexing skarn-type Cu polymetallic deposit related to the 160 Ma granites, and the Zhuxi skarn-type Cu-W deposit related to the 146 Ma granites. Thus, considering previous regional data, the hypothesis from this study is that the ore-related magmas of Neoproterozoic and Jurassic in the belt were derived from the same magma chamber and the latter was inherited from the former. The porphyry granite and aplite veins formed in 145 Ma are the indicators of Cu-W deposit.

The Zhuxi deposit is a new discovery of copper-tungsten dominated large-super-large ore deposit with great mineralization potential situated in the Zhuxi Area, Jingdezhen City, Jiangxi Province. However, present research is somewhat limited for some of the geological characteristics. Further study on genetic types and geochemical characteristics for this deposit is necessary. A bench-top type Polarized Energy Dispersive X-Ray Fluorescence Spectrometer, coupled with directly pressed powder samples has been used to analyze drill core samples of the Cu-W ore body. The instrument used in the experiments has a high detection ability for measuring major elements (SiO2, CaO and MgO) and trace elements (Cu, W, Zn and Ag), compositions with low detection limit, small error, good stability and other characteristics. The experimental results show that the major elements of SiO2, CaO and MgO have strong metasomatism characteristics. The SiO2 and CaO have a negative correlation. Trace elements Cu, W, Zn and Ag also exhibit symbiotic features, and Cu, W contents are high in the middle and low on both sides spatially. All evidence explains the metasomatism characteristics controlled by structures. The element variations and related mineral compositions also indicate that ore-forming materials were derived from granodiorite, porphyry, granite porphyry and diorite. These results provide a theoretical basis for mineralization forecast and further exploration goals.

A new tungsten-copper deposit with large-super mineralization potential was recently discovered in the Zhuxi area, Jingdezhen city of Jiangxi Province. The primary halo research plays a very important guiding role in further exploration work. By using Polarized Energy Dispersive X-ray Fluorescence Spectrometry, Inductively Coupled Plasma-Mass Spectrometry / Atomic Emission Spectrometry, large amounts of sample analyses have been conducted. According to the contents of elements W, Sn, Bi, Mo, Pb, Zn, Cu, As, Sb and Ag, these are served as the indicators of the primary halo. The primary halo of Zhuxi tungsten-copper deposit shows that Cu, Zn, Ag and Pb have good correlation as well as W, Bi, Sn and Mo. W is also correlated with Cu. The ore -forming elements have some characteristics in space. In the same section, high temperature elements such as W are more enriched at the northwest, whereas in the plane, this performance appeared at the southwest. Overall, W-oriented high-temperature elements are more enriched at lower depths. By comparison, Cu-oriented middle-temperature elements are shallower than W. This study indicates that the Cu deposit is distributed in the medium deep part (-1400--1500 m), W deposit in the deep part ( -1400--1900 m) and Ag, As, Sb at the surface (-1100--1200 m). This study provides a theoretical basis for mineralization forecast and further exploration. [ABSTRACT FROM AUTHOR]

The three-dimensional finite element model of linear friction welding (LFW) of TC4 titanium alloy was established on the basis of DEFORM software. The material flow behavior during the welding process was numerically simulated. The results show that the flow velocity of material near the edge of friction surface is bigger than that in the middle of friction surface. In the friction stage, the flow of material in the friction surface happens both parallel to and perpendicular to the vibration direction of weldment. In the forging stage, the material near edge line of friction surface undergoes big flow velocity and low temperature value, which makes the axial shortening of weldment increasing. The displacement of material perpendicular to the vibration direction decreases with the increase of distance away from the edge of friction surface, which shows that the self-cleaning of linear friction welding may happen in the whole friction surface only in the case of large axial shortening of weldment. [ABSTRACT FROM AUTHOR]

The test of anoxic phosphate uptake of denitrifying phosphorous removal bacteria (DPB) which was cultivated during the anaerobic/ anoxic/aerobic processes was conducted at the various situations of electron acceptors. The various concentrations of nitrate or nitrite were added during the anoxic stage respectively. The conclusions stated that the anoxic phosphate uptake of DPB was rarely influenced by the concentration of nitrate with the adequate nitrate as electron acceptors. It takes 1 mg PO4(3-) -P when the consumption of NO3(-) -N is 1 mg. The nitrite could be regarded as the electron acceptor to participate into the activities of denitrifying phosphorous removal. Compared with the nitrate, the phosphorous uptake rate of DPB with nitrite was rather higher at a low concentration (NO2(-) -N with the concentration range of 5 - 20 mg/L). Furthermore, the rate of anoxic phosphorous uptake was increased with the decreased concentration of NO2(-) -N. The restraining effects related to the anoxic phosphors uptake of DPB was increased as the increase of nitrite concentration. Hence, the anoxic phosphorous uptake of DPB was entirely inhibited when the concentration of NO2(-) -N was higher than 35 mg/L.

The inheritance of an ultra-dwarf plant mutant from upland cotton (Gossypium hirsutum L.) was studied, which showed that the mutant was controlled by single recessive quality gene. This gene was denominated as du tentatively. No similar mutant has been found in upland cotton. The mutation could not normally flower and produce bolls under natural conditions, and its mature height was only 10.5 cm. When treated with exogenous GA3, it could normally flower and boll, and plant height could reach 57.8 cm finally.

A high ammonia micropolluted source water advanced treatment for ammonia removal by biological activated carbon filter was tested. The removal rate of ammonia was high than 95% when influent concentration was under 1.0 mg/L. The removal rate decreased with the influent concentration increased when the ammonia concentration was in range of 1.5 - 4.9 mg/L and the influent DO was under 10 mg/L, and the minimum removal rate was about 30%. The key factor of restrict nitrification in BACF was the influent DO. When the influent ammonia concentration was high, the DO in water was depleted quickly by nitrify and hetetrophic bacteria in 0.4 m deep of filter and the filter layer was divided to aerobic zone and anoxic zone. The denitrification was occurred in the anoxic zone, and because of very low concentration of electron donor led to accumulation of the denitrification intermediates such as NO2-. Aerobic bacteria was existed in the anoxic zone.