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Gold Science and Technology >

2024 , Vol. 32 >Issue 1: 41 - 54

DOI: https://doi.org/10.11872/j.issn.1005-2518.2024.01.091

Mineral Exploration and Resource Evaluation

Occurrence State and Enrichment Mechanism of Gold in Nanlü-Xinmu Gold Deposit，Shandong Province

  • Lei SHI , 1 ,
  • Xirong WANG , 2, 3 ,
  • Xiaofeng NING 3 ,
  • Fengbin LU 3 ,
  • Yanbo XU 3 ,
  • Yanan LI 4, 5
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  • 1. Anhui Technical College of Industry and Economy, Hefei 230051, Anhui, China
  • 2. Anhui Provincial Geological Experimental Research Institute (Hefei Mineral Resources Supervision and Testing Center of the Ministry of Land and Resources), Hefei 230001, Anhui, China
  • 3. Shandong Gold Group Geological and Mineral Exploration Co. , Ltd. , Laizhou 261400, Shandong, China
  • 4. School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China
  • 5. Northern Engineering Design and Research Institute Co. , Ltd. , Shijiazhuang 050000, Hebei, China

Received date: 2023-06-13

  Revised date: 2023-09-05

  Online published: 2024-03-22

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Abstract

The Nanlü-Xinmu gold deposit is a super large gold deposit since explored.In order to discuss the occurrence status and enrichment mechanism of gold，rock and ore samples were collected in this study.The ore structure，mineral composition，mineral generation sequence，mineralization stage division，and the morphology，particle size，fineness，occurrence status，and enrichment mechanism of gold were obtained by using optical thin section identification，energy spectrum，and electron probe microanalysis（EPMA） methods.The mineralization stage of Nanlü-Xinmu gold deposit can be divided into four stages，namely pyrite-quartz（Ⅰ），gold-pyrite-quartz（Ⅱ），gold-quartz-polymetallic sulfide （Ⅲ）and quartz-carbonate（Ⅳ）.The main mineralization stage of gold is the second and third stages.The existence modes of gold include interstitial gold（49.87%），fissure gold（42.81%），and inclusion gold（7.31%）.The size of crack gold is 7~20 μm.The fineness of gold is between 886 and 943，the average fineness is 845.10，and the coefficient of variation is 11.72%.The correlation analysis results show that the most significant correlations are gold-silver and iron-sulfur.The correlation between gold and other elements is in the order of Au-Ag-Cr-Fe-S，with little correlation with Pb，Cu，Zn，etc.Pyrite is a gold bearing mineral.Gold is leached out from the ore source bed（ancient Metamorphic rock and Linglong composite rock body） and migrated as simple chlorides and complexes.Gold mineralization is concentrated in the superposition of two mineralization stages.This study provides basic data for revealing the occurrence and genesis of regional gold.

Key words： occurrence state of gold; metallogenic and enrichment mechanism; metallogenic stage; gold fineness; Nanlü-Xinmu gold deposit

Cite this article

Lei SHI , Xirong WANG , Xiaofeng NING , Fengbin LU , Yanbo XU , Yanan LI . Occurrence State and Enrichment Mechanism of Gold in Nanlü-Xinmu Gold Deposit，Shandong Province[J]. Gold Science and Technology, 2024 , 32(1) : 41 -54 . DOI: 10.11872/j.issn.1005-2518.2024.01.091

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北秦岭高岭沟—五里川成矿带找锑获进展

据2月5日消息，中国地质调查局西安矿产资源调查中心（以下简称西安矿产中心）在陕西省商洛市大落日沟地区新发现锑矿化蚀变带1条，圈定锑矿体1条，取得找矿新进展。

2023年以来，西安矿产中心聚焦推进新一轮找矿突破战略行动，牵头实施“金锑锂铍矿产找矿靶区调查评价”二级项目，坚持科技创新，拓展找矿思路，在总结北秦岭高岭沟—五里川锑金成矿带成矿规律基础上，突出近SN向控矿构造调查研究，圈定锑金找矿靶区3处；在蔡凹中型锑矿南侧大落日沟地区新发现锑矿化蚀变带1条，长约1 000 m、宽约4 m，钻探工程控制圈定锑矿体1条，初步估算锑潜在资源3 500 t，其走向和倾向延伸方向找矿潜力较大，具中型找矿远景，进一步扩大了成矿带内锑金找矿前景。相关找矿成果为引导拉动矿区后续商业性投资奠定了良好基础。

下一步，西安矿产中心将持续加强成果集成，加大科技攻关，扩大找矿成果，促进成果转化，力争在新一轮找矿突破战略行动中作出新的贡献。

中国自然资源报）

http://www.goldsci.ac.cn/article/2024/1005-2518/1005-2518-2024-32-1-41.shtml

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