A magmatic-hydrothermal indium-bearing polymetallic vein mineralization belt in the western Jiangnan Orogen: Evidence from zinc and cadmium isotopes of sphalerite
A magmatic-hydrothermal indium-bearing polymetallic vein mineralization belt in the western Jiangnan Orogen: Evidence from zinc and cadmium isotopes of sphalerite
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江南造山带西部岩浆热液含铟多金属脉成矿带：来自闪锌矿锌、镉同位素的证据
DOI：
10.1016/j.oregeorev.2020.103843
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发表时间：
2021-04
影响因子：
3.3
通讯作者：
Hanjie Wen
中科院分区：
文献类型：
--
作者：
Zhengbing Zhou;Hanjie Wen
江南造山带西部板溪群上部产出高铟锌铅（铜）多金属矿脉。多金属脉型矿床中的铟赋存于闪锌矿和黄铜矿中。Cu ~（++）、In ~（3+）、Zn ~（2+）、Fe ~（2+）是这些沉积物中最可能的In替代机制。成矿后期热液富集Cu、In、Co、Mn、Fe。矿石、闪锌矿和白云岩矿物显示出类似的Ce、Eu异常和Zn/Cd比值，但与寄主岩石有明显差异，表明矿化金属不是来自寄主岩石。闪锌矿中Zn、Cd同位素变化相对较窄（δ 66 ZnJMC = +0.01‰ ~+0.28‰; δ 114 CdSpex =-0.14 ‰ ~+0.11‰），但在成矿过程中表现出增加的趋势，且与Cd浓度呈负相关，瑞利蒸馏可能是闪锌矿的分馏机制。Zn/Cd比值和Zn、Cd同位素变化表明，脉状多金属矿床为岩浆热液成因。这些热液流体可能来自花岗岩岩浆中Zn、Cd、Cu、In和Sn的分馏作用。这是由广西造山带陆内造山事件中地壳增厚和下地壳沿沿着江南造山带滑脱所触发的。该期花岗质岩浆活动可能是华南地区又一重要的铟成矿期。
Polymetallic veins of Zn-Pb (Cu) deposits containing elevated levels of indium are hosted within the upper part of the Banxi Group in the western Jiangnan Orogen. The indium in the polymetallic vein deposits is hosted within sphalerite and chalcopyrite. Cu++In3+↔Zn2++Fe2+is the most plausible indium substitution mechanism for ZnS in these deposits. Hydrothermal fluids were enriched in Cu, In, Co, Mn and Fe in the later mineralization stage. Ores, sphalerite and dolomite minerals displayed analogous Ce and Eu anomalies, and Zn/Cd ratios, while being noticeably different from its host rocks, that provided its mineralized metals were not derived from its host rock. Despite the Zn and Cd isotopic variations in sphalerite being relatively narrow (δ66ZnJMC= +0.01‰–+0.28‰; δ114CdSpex= −0.14‰–+0.11‰), they display increase during mineralization and are negatively correlated to Cd concentrations; the Rayleigh distillation might be the fractionation mechanism. Zn/Cd ratios and Zn-Cd isotopic variations suggest the magmatic-hydrothermal origin of the polymetallic vein-type deposits. These hydrothermal fluids might derive from the fractionation of Zn, Cd, Cu, In and Sn in the granitic magma. This is triggered by crust thickening and the detachment of the lower crust along the Jiangnan Orogen during the intracontinental orogenic events of the Guangxi orogeny. This period of granitic magmatism might be another important indium mineralization episode in South China.
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