铁同位素作为矿流体示踪剂——以辽宁青城子Pb - Zn - Au(‐Ag)矿田为例

IF 1.1 4区 地球科学 Q3 GEOLOGY
Resource Geology Pub Date : 2021-06-17 DOI:10.1111/rge.12261
Dedong Li, Yuwang Wang, Jingbin Wang, Chunkit Lai, J. Qiu, Wei Wang, Shenghui Li, Zhichao Zhang
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引用次数: 0

摘要

青城子Pb - Zn - Au (- Ag)矿田位于华北克拉通东北缘。通过对黄铁矿非常规铁同位素的分析,揭示了黄铁矿的矿物来源和矿流体的运移途径。采集了矿区不同矿床的矿石和围岩的黄铁矿样品,并用MC - ICP - MS对溶液进行了分析。结果表明,大多数黄铁矿样品含有比国际黄铁矿标准IRMM‐014更重的铁同位素。在一个特定的矿床中,铁同位素随着深度的增加而变轻。例如,镇子沟矿床黄铁矿δ56Fe值从0.216 ~ 0.408‰(150‐m水平)降至- 0.284 ~ - 0.132‰(210‐m水平)。矿区金矿床也具有相似的特征:在白云(黄店子),硅/钾蚀变岩型矿石(130‐m)的黄铁矿δ56Fe值(0.394 ~ 0.627‰)显著高于石英脉型矿石(440‐m)的黄铁矿δ56Fe值(0.359‰)。不同矿床的煌斑岩δ56Fe值基本相似(0.040 ~ 0.024‰),而围岩的δ56Fe值差异较大(0.144 ~ 1.238‰)。综合该区许多重要的沉积/变质岩单元及世界各地岩浆热液矿床的黄铁矿δ56Fe值,认为青城子Pb - Zn - Au(- Ag)矿床属于侵入岩浆热液型。流体同位素空间变化模式及早期形成的硫化物比晚期形成的硫化物同位素轻的特征表明,青城子矿流体可能起源于镇子沟—滇南(热液中心),并流出至小通家铺子、古家铺子—白云和二道—西渠沟地区。空间流体同位素变化模式也提示白云—古家埔子可能存在另一个热液中心。热液中心的识别和流体运移路径的描绘表明,黄铁矿铁同位素可作为贵金属和贱金属找矿的工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Iron isotopes as an ore‐fluid tracer: Case study of Qingchengzi Pb‐Zn‐Au(‐Ag) orefield in Liaoning, NE China

Iron isotopes as an ore‐fluid tracer: Case study of Qingchengzi Pb‐Zn‐Au(‐Ag) orefield in Liaoning, NE China
The Qingchengzi Pb‐Zn‐Au (‐Ag) orefield (eastern Liaoning province, NE China) is located in the northeastern margin of the North China Craton. The unconventional Fe isotopes of pyrites were analyzed to unravel the ore‐material source and migration pathway of the ore fluids. Pyrite samples of ores and wallrocks from various deposits in the orefield were collected and the solutions were analyzed by MC‐ICP‐MS. The results show that most pyrite samples contain heavier Fe isotopes than the international pyrite standard IRMM‐014. Within a particular deposit, Fe isotopes become lighter with depth. For example, the pyrite δ56Fe values drop from 0.216 ~ 0.408‰ (150‐m level) to −0.284 to −0.132‰ (210‐m level) at the Zhenzigou deposit. Gold deposits in the orefield also have similar features: At Baiyun (Huangdianzi), the pyrite δ56Fe values (0.394 ~ 0.627‰) of the silicic‐/potassic‐altered rock‐type ore (130‐m level) are significantly higher than that (0.359‰) of the quartz vein‐type ore (440‐m level). The lamprophyre δ56Fe values from different deposits are largely similar (0.040 ~ 0.024‰), whereas those in the wallrocks vary considerably (0.144 ~ 1.238‰). Compiling the pyrite δ56Fe values from many important sedimentary/metamorphic rock units in the region and magmatic‐hydrothermal deposits around the world, we concluded that the Qingchengzi Pb‐Zn‐Au(‐Ag) deposits belong to intrusion‐related magmatic‐hydrothermal type. The spatial fluid isotope variation pattern, and the fact that early‐formed sulfides have lighter isotopes than later ones, suggest that the Qingchengzi ore fluids may have originated from Zhenzigou‐Diannan (hydrothermal center) and outflown to Xiaotongjiapuzi, Gujiapuzi‐Baiyun and Erdao‐Xiquegou areas. The spatial fluid isotope variation pattern also suggests another possible hydrothermal center at Baiyun‐Gujiapuzi. The ability to identify hydrothermal center(s) and delineate fluid migration pathways suggests that pyrite Fe isotopes can serve as a tool for precious and base metals prospecting.
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来源期刊
Resource Geology
Resource Geology 地学-地质学
CiteScore
2.30
自引率
14.30%
发文量
18
审稿时长
12 months
期刊介绍: Resource Geology is an international journal focusing on economic geology, geochemistry and environmental geology. Its purpose is to contribute to the promotion of earth sciences related to metallic and non-metallic mineral deposits mainly in Asia, Oceania and the Circum-Pacific region, although other parts of the world are also considered. Launched in 1998 by the Society for Resource Geology, the journal is published quarterly in English, making it more accessible to the international geological community. The journal publishes high quality papers of interest to those engaged in research and exploration of mineral deposits.
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