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Multiple-stage tungsten mineralization in the Silurian Jiepai W skarn deposit, South China: Insights from cathodoluminescence images, trace elements, and fluid inclusions of scheelite

Published on Sep 1, 2019in Journal of Asian Earth Sciences 2.76
· DOI :10.1016/j.jseaes.2019.103898
Jiadai Li (CAS: Chinese Academy of Sciences), Xiaofeng Li7
Estimated H-index: 7
(CAS: Chinese Academy of Sciences),
Rong Xiao
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Abstract
Abstract The Jiepai deposit, located in the northeastern part of the Miao’ershan-Yuechengling batholith, South China, is characterized by predominant skarn mineralization that formed near the contact between the Silurian biotite granites and the Upper Cambrian carbonate rocks. Jiepai scheelites are recognized as two main generations based on their occurrences, cathodoluminescence (CL) signatures, and REE systematics. Prograde skarn-hosted scheelite I has uniformly dark CL characteristics and LREE-enriched patterns. Retrograde skarn-hosted scheelite IIa is homogeneously dark under CL, and has a slightly MREE-enriched pattern, whereas quartz vein-hosted scheelite IIb is delineated by fine oscillatory CL zones and a relatively flat REE pattern. Additionally, the CL images reveal that both scheelite I and II were modified by later-stage hydrothermal overprints, which occur as ubiquitous overgrowth rims and cutting veins with bright CL signatures, low REE, but similar REE patterns to their precursors. The compositional variations and fluid inclusions in Jiepai scheelites identify episodic pulses of hydrothermal fluids with different properties. The ore-forming fluids with high Nb/Ta, but low Nb, Ta and REY in the early retrograde stage are featured by moderate to high temperature and low to moderate salinity. Under relatively oxidizing conditions, they interacted with the host rock and underwent boiling to precipitate scheelite I. By contrast, the fluids with higher Nb, Ta and REY, but lower Nb/Ta in the late retrograde stage have slightly lower temperature and higher salinity. We therefore speculate that scheelite II may deposit from later magmatic fluids that have experienced continued boiling in more reducing environment.
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References57
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Published on Apr 1, 2019in Mineralium Deposita 3.40
Shiwei Song1
Estimated H-index: 1
(PKU: Peking University),
Jingwen Mao33
Estimated H-index: 33
(PKU: Peking University)
+ 5 AuthorsYongpeng Ouyang2
Estimated H-index: 2
The Zhuxi W (Cu) skarn deposit is the largest W deposit in the Jiangnan porphyry–skarn tungsten belt in South China, and is also among the largest deposit of this type in the world. Titanite is a common mineral in the Zhuxi deposit, and occurs in three textural settings: titanite I associated with retrograde-altered exoskarn with weak mineralization; titanite II in retrograde-altered endoskarn with disseminated Cu ore; and titanite III from altered granite with disseminated W ore. Here, we prese...
Published on Apr 1, 2019in Ore Geology Reviews 3.39
Keke Sun (China University of Geosciences), Bin Chen26
Estimated H-index: 26
(SU: Southern University and A&M College),
Jun Deng31
Estimated H-index: 31
(China University of Geosciences)
Abstract Scheelite is the main ore mineral in skarn-type tungsten deposits, which can be used to track the ore-forming processes and sources. The Zhuxi W-Cu deposit (3.44 Mt WO 3 at 0.54% and 0.10 Mt Cu at 0.57%), located in the northern part of the Jiangnan orogen, is one of the largest tungsten deposits in the world. Skarn and orebodies occur mainly within the contact zone between the Mesozoic highly fractionated intrusions and Carboniferous carbonate sediments (Huanglong and Chuanshan formati...
Published on Mar 1, 2019in Mineralium Deposita 3.40
Guiqing Xie3
Estimated H-index: 3
,
Jingwen Mao33
Estimated H-index: 33
+ 2 AuthorsZhiyuan Zhang3
Estimated H-index: 3
The Caojiaba tungsten deposit (19.03 Mt@ 0.37 wt% WO3) is hosted by skarn along the contact between clastic and carbonate rocks in the Xiangzhong Metallogenic Province of southern China. The deposit is characterized by an early prograde skarn containing low andraditic garnet (Ad0.7–21.9) and hedenbergitic pyroxene (Hd52.9–77.3) overprinted by a retrograde biotite–chlorite assemblage and then by quartz–scheelite veins, similar to well-studied reduced tungsten skarns worldwide. Scheelite has low M...
Published on Aug 1, 2018in Ore Geology Reviews 3.39
Xiao-Yu Li1
Estimated H-index: 1
(NU: Nanjing University),
Jian-Feng Gao27
Estimated H-index: 27
(CAS: Chinese Academy of Sciences)
+ 3 AuthorsJin-Wei Wu2
Estimated H-index: 2
(NU: Nanjing University)
Abstract The Late Triassic Muguayuan W deposit is located in the middle of the Jiangnan Orogen, South China. This deposit is characterized by veinlet-disseminated W mineralization that developed in the Sanxianba granitic porphyry stock. The ore minerals are mainly scheelite with minor molybdenite and wolframite. Scheelite mineralization was closely related to greisenization and phyllic alteration, and took place in two stages. Stage I involved scheelite ± wolframite ± molybdenite + quartz veinle...
Published on Jul 1, 2018in Journal of Asian Earth Sciences 2.76
Chao Li2
Estimated H-index: 2
,
Li-min Zhou3
Estimated H-index: 3
+ 4 AuthorsWenjun Qu2
Estimated H-index: 2
Abstract Scheelite is one of the main ore minerals in tungsten deposits, and Sr isotopic compositions of scheelite can be used to examine the petrogenesis of igneous rocks and fluid metasomatism in mineralization processes. Both thermal ionization mass spectrometer (TIMS) and femsecond laser ablation multi-collector inductively coupled plasma mass spectrometer (fs-LA-MC-ICP-MS) have been applied to analyze Sr isotopic compositions in scheelite. Here we describe a LA-MC-ICP-MS technique which can...
Published on Mar 1, 2018in Ore Geology Reviews 3.39
Teng Ding4
Estimated H-index: 4
(Hohai University),
Dongsheng Ma5
Estimated H-index: 5
(NU: Nanjing University)
+ 1 AuthorsRongqing Zhang12
Estimated H-index: 12
(CAS: Chinese Academy of Sciences)
Abstract The Huangshaping W–Mo–Pb–Zn deposit in southern Hunan province, south China, contains multiple generations of garnet and scheelite in skarn and sulfide–carbonate altered rocks. Optical characteristics and chondrite-normalized rare earth element (REE N ) patterns obtained by in situ laser ablation–inductively coupled plasma–mass spectrometry analysis were used to distinguish different generations of garnet and scheelite. These data show a clear correspondence of garnet REE N patterns to ...
Published on Feb 1, 2018in Ore Geology Reviews 3.39
Wen Winston Zhao2
Estimated H-index: 2
(HKU: University of Hong Kong),
Mei-Fu Zhou69
Estimated H-index: 69
(HKU: University of Hong Kong)
Abstract The Baoshan scheelite deposit, located in the Nanling region, South China, is a skarn-type tungsten ore deposit. Orebodies occur in the contact zone between Carboniferous limestone and Baoshan granitic pluton. The pluton consists mostly of coarse-grained, porphyritic, and fine-grained biotite granites, which have zircon U-Pb ages of 172.4 ± 0.3 Ma, 166.6 ± 0.3 Ma, and 156.6 ± 1.4 Ma, respectively. These rocks have similar geochemical characteristics with high SiO 2 , total alkalis, high...
Published on Jan 1, 2018in Geology 5.01
Maximilian Korges1
Estimated H-index: 1
,
Philipp Weis11
Estimated H-index: 11
+ 1 AuthorsOscar Laurent10
Estimated H-index: 10
(ETH Zurich)
Published on Jan 1, 2018in Chemical Geology 3.62
Wen Winston Zhao3
Estimated H-index: 3
(HKU: University of Hong Kong),
Mei-Fu Zhou69
Estimated H-index: 69
(HKU: University of Hong Kong)
+ 1 AuthorsZheng Zhao4
Estimated H-index: 4
Abstract Scheelite is the main ore mineral in skarn-type tungsten deposits, and a common accessory mineral in a variety of rock-types. The Baoshan deposit in South China is one of the most important polymetallic scheelite skarn deposits in China, hosting 40,000 t of WO 3 with economic concentrations of Zn, Cu, and Ag. It is hosted by a calcic skarn that is zoned outwards mineralogically from garnet-clinopyroxene, through clinopyroxene-garnet, to wollastonite, and overprinted by retrograde minera...
Published on May 1, 2017in American Mineralogist 2.63
Keke Sun1
Estimated H-index: 1
(PKU: Peking University),
Bin Chen1
Estimated H-index: 1
(Hefei University of Technology)
The Shimensi deposit (South China) is a newly discovered W-Cu-Mo polymetallic deposit with a reserve of 0.76 million tones WO 3 , one of the largest tungsten deposits in the world. We report elemental and Sr-Nd isotopic data for scheelites from the giant deposit, to determine the source region and genesis of the deposit. Scheelite is the most important ore mineral in the Shimensi deposit. Trace elements (including REEs) and Nd-Sr isotopic compositions of scheelites were used to constrain the ori...
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