Metal source of gold deposits in the Jiaoxibei area, Eastern China: Insights from trace element analysis of gold and pyrite

IF 1.1 4区地球科学 Q3 GEOLOGY

Resource Geology Pub Date : 2021-09-29 DOI:10.1111/rge.12278

Jilong Lu, Yuchao Fan, Yechang Yin, Yuxin Xiong, Jinke Guo, Wu Tian, Xinyun Zhao

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引用次数: 1

Abstract

The metal source of gold deposits in the Jiaoxibei area, eastern China, has been investigated by many researchers, but no consensus has been reached so far. In this study, three typical gold deposits, the Xinli, Jiaojia, and Dayingezhuang deposits, were selected for trace element analysis of gold and pyrite to constrain the metal source. Pyrite from these three deposits has similar morphological and compositional characteristics, and can be divided into three types: Py1 with euhedral to subhedral textures, Py2 with subhedral to anhedral textures with micro‐fractures, and Py3 with subhedral to anhedral textures and intergrowing polymetallic sulfides. Among them, Py2 and Py3 were formed in the main ore‐forming stage and they are the dominant host minerals of visible gold. In these deposits, visible gold occurs mainly in micro‐fractures or as inclusions in Py2 and Py3. Most of the pyrite has extremely low concentration of invisible gold, indicating that visible gold in the Jiaoxibei district is not a product of the remobilization of invisible gold from earlier pyrite. Both Py2 and Py3 are characterized by low Co concentration of <100 ppm and Co/Ni ratio of <1, which are similar to those of pyrite in sedimentary rocks. Therefore, ore‐forming metals of these gold deposits in the Jiaoxibei district may originate mainly from a sediment‐related metal source.

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中国东部焦西北地区金矿床的金属来源——来自金和黄铁矿微量元素分析的启示

中国东部焦西北地区金矿床的金属来源研究较多，但至今尚未达成共识。本文选取新里、焦家、大营尔格庄3个典型金矿床进行了金、黄铁矿微量元素分析，以约束金属来源。3个矿床的黄铁矿具有相似的形态和组成特征，可分为3种类型:Py1为自面体-亚面体结构，Py2为半面体-反面体结构，并有微裂缝，Py3为半面体-反面体结构，并有共生多金属硫化物。其中，Py2和Py3形成于主成矿阶段，是可见金的主要寄主矿物。可见金主要以微裂隙或包体形式赋存于Py2、Py3矿床中。大部分黄铁矿中不可见金的浓度极低，说明焦西北区的可见金不是早期黄铁矿中不可见金再活化的产物。Py2和Py3的Co浓度均较低，<100 ppm, Co/Ni比值<1，与沉积岩中的黄铁矿相似。因此，焦西北区金矿床的成矿金属可能主要来源于与沉积有关的金属源。

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来源期刊

Resource Geology 地学-地质学

CiteScore

2.30

自引率

14.30%

发文量

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.