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Texture and trace element geochemistry of quartz in skarn system: perspective from Jiguanzui Cu-Au skarn deposit, Eastern China
Zhang, Y and Cheng, J and Tian, J and Pan, J and Sun, S and Zhang, L and Zhang, S and Chu, G and Zhao, Y and Lai, C, Texture and trace element geochemistry of quartz in skarn system: perspective from Jiguanzui Cu-Au skarn deposit, Eastern China, Ore Geology Reviews, 109 pp. 535-544. ISSN 0169-1368 (2019) [Refereed Article]
© 2019 Elsevier B.V. All rights reserved.
The Jiguanzui Cu–Au deposit is an important skarn deposit in the Edong ore district of the Middle–Lower Yangtze River Valley Metallogenic Belt (MLYRB), Eastern China. The skarn mineralization occurs dominantly in the intrusive contact between quartz diorite and marble of the Lower-Middle Triassic Jialingjiang Formation. The main mineralization stage (quartz-sericite-pyrite-chalcopyrite) is characterized by abundant quartz, which can be grouped as quartz in orebodies (Qtz1), quartz in quartz-pyrite hydrothermal veins in hornfels of the Middle Triassic Puqi Formation and quartz diorite (Qtz2 and Qtz3, respectively). Cathodoluminescent (CL) imaging reveals core-rim texture in Qtz1 and oscillatory zoning in Qtz2 and Qtz3, suggesting that Qtz1 was formed under low crystallization rate, in a relatively stable closed system, whereas Qtz2 and Qtz3 were formed under high crystallization rate, in an open system with oscillatory physicochemical fluctuations. As the main trace element in the Jiguanzui quartz, aluminum is incorporated into quartz as trivalent Al3+ to substitute Si4+. Monovalent alkali metal (esp. Li+) and divalent cations (Ge2+, Sr2+) act as charge compensators for the Al3+ substitution. Titanium concentrations (mostly <10 ppm) and the clear positive Al vs. Li correlation indicate the main mineralization at Jiguanzui formed under low temperature (<350 °C). Additionally, CL reflectivity of Qtz1 increases from core to rim, suggesting neutralization of the acidic ore fluids, which is interpreted to be an important cause of metal sulfide precipitation at Jiguanzui.
|Item Type:||Refereed Article|
|Keywords:||Quartz texture and geochemistry; Skarn system; Jiguanzui Cu-Au deposit; Middle-Lower Yangtze River Valley; Metallogenic Belt; Eastern China|
|Research Division:||Earth Sciences|
|Research Field:||Exploration geochemistry|
|Objective Division:||Mineral Resources (Excl. Energy Resources)|
|Objective Group:||Mineral exploration|
|Objective Field:||Copper ore exploration|
|UTAS Author:||Zhang, L (Dr Lejun Zhang)|
|Web of Science® Times Cited:||21|
|Deposited By:||Plant Science|
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