Genesis of the Baiyangping Cu–Co and Pb–Zn Mineralizations in Lanping Basin, SW China
Genesis of the Baiyangping Cu–Co and Pb–Zn Mineralizations in Lanping Basin, SW China
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兰坪盆地白杨坪铜钴铅锌矿化成因
DOI：
10.3390/app12042129
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发表时间：
2022-02
期刊：
影响因子：
--
通讯作者：
Rong Hu
中科院分区：
文献类型：
--
作者：
Jiaxuan Zhu;Hongyu Duan;Lifei Yang;Qi Chen;Lijun Liu;Kangxing Shi;Jinlong Qian;Qiaoxin Li;Rong Hu
渐新世-中新世白秧坪铜钴铅锌矿化是在印度大陆与亚洲大陆碰撞过程中沉积的。成矿作用赋存于断层碳酸盐岩和碎屑岩中的脉中，这些脉充当流体通道。详细报道了流体包裹体分析和C-O-S同位素研究，重点讨论了成矿流体的来源和成矿过程。石英和碳酸盐岩中流体包裹体的显微测温表明，铜钴和铅锌矿化的流体峰值温度分别为160 ~ 200 °C和120 ~ 160 °C。在这些成矿热液事件中，盐度从2.7wt%NaCl当量演化到24.8wt%NaCl当量。闪锌矿和砷黝铜矿的δ 34 S值介于+5.2‰ ~+9.5‰之间，表明硫来自于以热化学硫酸盐还原（TSR）为特征的储层。碳酸盐岩样品的碳氧同位素值表明，流体主要来源于盆地卤水。铜钴和铅锌矿化的碳、硫同位素组合指示了盆地的沉积物源。成矿作用受断层、热化学硫酸盐还原作用和流体物理化学条件的控制。
The Oligocene to Miocene Baiyangping Cu–Co and Pb–Zn mineralization was deposited during the collision of the India and Asia continents. The mineralization is hosted in veins in faulted carbonate and clastic rocks, which act as fluid pathways. A detailed fluid-inclusion analysis and C–O–S isotopic study are reported, focusing on the origin of the mineralizing fluids and mineralizing processes. The microthermometry of fluid inclusions hosted in quartz and carbonates indicate that the fluid peak temperature for both Cu–Co and Pb–Zn mineralizations ranges from 160 to 200 °C and from 120 to 160 °C, respectively. During these metallogenic hydrothermal events, salinity evolved from 2.7 wt% NaCl equiv to 24.8 wt% NaCl equiv. The δ34S values measured on sphalerite and tennantite range from +5.2‰ to +9.5‰, which indicates that sulfur originated from a reservoir characterized by thermochemical sulfate reduction (TSR). The C–O isotopic values obtained from the carbonate samples suggest that the fluid mainly originates from basinal brines. The combination of C and S isotopic values of the Cu–Co and Pb–Zn mineralization indicate the sedimentary source of the basin. Mineralization is controlled by faults, thermochemical sulfate reduction, and the physicochemical conditions of the fluid.
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