中硫化浅成热液系统中黄铁矿微量元素地球化学特征及其意义——以正光金锌矿为例

IF 3.3 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Journal of Geochemical Exploration Pub Date : 2025-05-30 DOI:10.1016/j.gexplo.2025.107810

Zhang-Wei Qin , Le Wang , Ke-Zhang Qin , Guang-Ming Li , Sheng-Chao Xue , Guo-Xue Song

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引用次数: 0

摘要

随着人们对中硫化浅成热液矿床的兴趣日益浓厚，主要含金矿物黄铁矿（FeS2）的矿物地球化学研究日益受到重视。本研究结合详细的岩石学分析和原位激光烧蚀电感耦合等离子体质谱法测量了正光中硫化浅成热液金锌矿(Au >；13.23 Mt @ 2.59 g/t, Zn >；7.08 Mt @ 1.05 wt%, Ag >；7.09公吨@ 12.03克/吨)。该矿床位于中亚造山带东段多宝山矿田东南部。本研究旨在全面表征典型微量元素（如Te、Co、Ni）在成矿过程中的行为，并对流体演化有深入的了解。正光矿床分为斑岩期（Py1）、浅成热液矿化期（Py2）和变形期（Py3） 3个矿石阶段和对应的黄铁矿阶段。黄铁矿与脉石共生矿物的微量元素比值（Ag/Co、Se/Te）和显微结构表明，早期斑岩型黄铁矿（Py1）普遍为自面体，原始，微量元素含量较低，形成于相对稳定的温和沸腾条件下，在岩浆流体主导下结晶。浅成热液黄铁矿（Py2）主要多孔且富含包裹体，微量元素含量升高，表明剧烈沸腾事件和大气流体的加入促使其快速结晶。与早期黄铁矿和浅成热液黄铁矿相比，晚期黄铁矿（Py3）中Se、Te、As、Tl、Au等元素变化明显，表明多宝山矿田整个矿带经历了区域变质作用。本研究明确了中硫化浅成热液系统中富金流体的演化过程，为浅成热液矿床的找矿提供了理论依据。

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Geochemistry of trace elements of pyrite and its implications in intermediate sulfidation epithermal systems: Case study based on the Zhengguang Au–Zn deposit, North-East China

With the growing interest in intermediate sulfidation epithermal deposits, the mineral geochemistry of pyrite (FeS₂), the main gold-bearing mineral, has received increasing attention. This study integrates detailed petrographic analysis and in situ laser ablation inductively coupled plasma mass spectrometry–based trace element measurements of pyrite grains from the Zhengguang intermediate sulfidation epithermal AuZn deposit (Au > 13.23 Mt @ 2.59 g/t, Zn > 7.08 Mt @ 1.05 wt%, Ag > 7.09 Mt @ 12.03 g/t). This deposit is located in the southeastern part of the Duobaoshan orefield in the eastern part of the Central Asian Orogenic Belt. This study aims to comprehensively characterize the behaviour of typical trace elements (e.g., Te, Co, Ni) during ore-forming processes and to derive insights into the fluid evolution. Three ore stages and corresponding pyrites are identified in the Zhengguang deposit: early porphyry stage (Py1), epithermal mineralized stage (Py2), and late deformed-stage (Py3). The ratios of certain trace elements (e.g., Ag/Co, Se/Te) and micro-textures of pyrite and coexisting gangue minerals suggest that early porphyry pyrites (Py1) are generally euhedral, pristine, and trace-element-poor, suggesting formation under relatively steady gentle boiling conditions and crystallization under a dominant magmatic fluid. Epithermal pyrites (Py2) are mainly porous and inclusion-rich and display elevated concentrations of trace elements, indicating rapid crystallization driven by vigorous boiling events and the addition of meteoric fluids. Compared with early pyrite and epithermal pyrite, late-stage pyrite (Py3) exhibits significant changes in several elements (Se, Te, As, Tl, and Au), indicating that the entire ore zone of the Duobaoshan orefield underwent regional metamorphism. This research clarifies the evolution processes of Au-rich fluids in the intermediate sulfidation epithermal system, and the outcomes can facilitate the exploration of epithermal deposits.

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来源期刊

Journal of Geochemical Exploration 地学-地球化学与地球物理

CiteScore

7.40

自引率

7.70%

发文量

148

审稿时长

8.1 months

期刊介绍： Journal of Geochemical Exploration is mostly dedicated to publication of original studies in exploration and environmental geochemistry and related topics. Contributions considered of prevalent interest for the journal include researches based on the application of innovative methods to: define the genesis and the evolution of mineral deposits including transfer of elements in large-scale mineralized areas. analyze complex systems at the boundaries between bio-geochemistry, metal transport and mineral accumulation. evaluate effects of historical mining activities on the surface environment. trace pollutant sources and define their fate and transport models in the near-surface and surface environments involving solid, fluid and aerial matrices. assess and quantify natural and technogenic radioactivity in the environment. determine geochemical anomalies and set baseline reference values using compositional data analysis, multivariate statistics and geo-spatial analysis. assess the impacts of anthropogenic contamination on ecosystems and human health at local and regional scale to prioritize and classify risks through deterministic and stochastic approaches. Papers dedicated to the presentation of newly developed methods in analytical geochemistry to be applied in the field or in laboratory are also within the topics of interest for the journal.