Wallrock Alteration and Metallogenic Stages of Pb-Zn Deposits in the Sichuan-Yunnan-Guizhou Border Area Southwest China

Long, Jian; Gao, Jin-Hua; Dao, Yan; Tan, Qing Li

doi:10.4028/www.scientific.net/amr.807-809.2120

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“…The Sichuan-Yunnan-Guizhou Pb-Zn polymetallic metallogenic triangle area (SYGT) is situated on the southwestern margin of the Yangtze Block (Figure 1a) and is an important component of the large low-temperature metallogenic domains in southwest China [1][2][3]. The SYGT is the largest Pb-Zn metallogenic area in China, with over 500 Pb-Zn deposits (spots) distributed in the area [4,5]. These are controlled by fault structures and distributed in a beaded shape along larger-scale fault zones.…”

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confidence: 99%

Metallogenesis and Formation of the Maliping Pb-Zn Deposit in Northeastern Yunnan: Constraints from H-O Isotopes, Fluid Inclusions, and Trace Elements

et al. 2023

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The Maliping large-scale Pb-Zn deposit is located in the Sichuan-Yunnan-Guizhou Pb-Zn polymetallic metallogenic triangle area (SYGT), where the Pb-Zn ore body is hosted in the interlayer fracture zone at the interface between siliceous cataclastic dolomite and clastic rocks in the Lower Cambrian Yuhuchun Formation and is tectonically driven. Unlike other Pb-Zn de-posits hosted in the Sinian and Carboniferous carbonate rocks in the area, the metallogenic mechanism and deep and peripheral ore prospecting prediction research require further exploration. In this study, representative samples of a typical orebody profile were systematically collected, and microthermometry of fluid inclusions and H-O isotopes and metal sulfide trace element analyses were performed. The main findings were as follows: (1) The fluid inclusion study showed that the ore-forming fluids have vapor-rich phase reduction characteristics of medium-low temperature, salinity, and density. (2) H-O isotopic studies showed that the ore-forming fluids are derived from the mixing of deep-source fluids flowing through the deep fold basement (Kunyang Group) and or-ganic-containing basin brine. (3) Rare earth element (REE) characteristics indicate that the ore-forming materials were primarily derived from the folded basement (Kunyang Group). (4) The trace element study showed that sphalerite is relatively enriched in Cu, Cd, Ga, and Ge, while depleted in Fe, Mn, Sn, and Co, similar to the typical Huize-type (HZT) Pb-Zn deposit in the area. Therefore, it is suitable to explore the deposit using a large-scale “four step style” ore prospecting method for ore prospecting and prediction. Moreover, the results provide a reference for the study of Pb-Zn metallogenic systems and new ideas for the deep and peripheral prospecting of Pb-Zn deposits in this area.

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