| 孙永亮,海连富,赵少卿,魏向成,梅超,陶瑞,母彩霞.宁夏西华山地区马场金矿床物质来源及矿床成因：来自S同位素证据[J].矿产勘查,2023,14(11):2039-2048 |
| 宁夏西华山地区马场金矿床物质来源及矿床成因：来自S同位素证据 |
| Material source and genesis of Machang gold deposit in Xihuashan area， Ningxia： Evidence from S isotope |
| 投稿时间：2023-02-21 修订日期：2023-06-26 |
| DOI：10.20008/j.kckc.202311003 |
| 中文关键词: 矿床成因 成矿物质来源 S同位素 马场金矿床 西华山地区 |
| 英文关键词: ore genesis source of ore-forming materials S isotope Machang gold deposit Xihuashan region |
| 基金项目:本文受宁夏回族自治区自然科学基金项目（2021AAC03447）、宁夏回族自治区重点研发计划项目（2021BEG03003）联合资助。 |
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| 中文摘要: |
| 西华山地区是宁夏自治区内重要的金多金属矿成矿远景区之一，区内构造活动强烈，各种矿化与热液蚀变现象明显，其中马场金矿床是该地区目前发现的规模最大的金矿床，矿（化）体主要由含金煌斑岩脉、碎裂云母钠长石英片岩及石英脉构成。为了探讨马场金矿床成矿物质来源和矿床成因，文章在系统总结前人资料基础上，对研究区S同位素进行了研究。研究表明：马场金矿床矿物组合较简单，成矿流体中不同价态的硫之间硫的同位素分馏较弱。S同位素数据显示，2件黄铜矿δ34S值平均为＋7.35‰，4件黄铁矿δ34S值平均为＋6.87‰，2件蚀变地层全岩δ34S值平均为＋4.09‰，反映出硫具有地层来源特点。中元古界海原群与金矿床的形成具有密切关系，为主要矿源层；区域变质作用过程中Au等成矿元素含量显著提升，但对成矿的贡献有限。晚奥陶世—早志留世区域岩浆活动为地层中矿质的再次活化、富集提供了动能和热力条件，从而形成现有规模的金矿床。通过与典型造山型金矿床进行对比，认为马场金矿床为北祁连造山带造山运动的产物，为造山型金矿床。 |
| 英文摘要: |
| Xihuashan area is one of the important gold-polymetallic ore-forming prospect areas in Ningxia， with strong tectonic activity and obvious mineralization and alteration phenomena. Machang gold deposit is the largest gold deposit found in the region at present. The ore （mineralized） body is mainly composed of gold-bearing lamprophyre vein， cataclastic mica albite quartz schist and quartz vein. In order to explore the source of ore-forming materials and genesis of the Machang gold deposit， the paper systematically summarized the previous data and studied the S isotope in the study area. The study show that the mineral assemblage of the Machang gold deposit is relatively simple， and the sulfur isotope fractionation between different valence sulfur in the ore-forming fluid is weak. S isotope data shows that 2 chalcopyrite samples δ34S average value is +7.35‰， 4 pyrite samples δ34S average value is +6.87‰， and 2 whole rock samples of altered formation δ34S average value is +4.09‰， reflecting that the sulfur has the characteristics of mixed source of strata and magma sulfur. The Middle Proterozoic Haiyuan Group is closely related to the formation of gold deposits and is the main source bed. The content of Au and other ore-forming elements increased significantly during the process of regional progressive metamorphism， but their contribution to mineralization was limited. Regional magmatic activities provided kinetic energy and thermal conditions for the reactivation and migration of minerals in the strata. At the same time， with the evolution of magma， the ore-forming materials in the magma also participated in the mineralization， and they were superimposed or separately mineralized in the form of various hydrothermal fluids and derived veins. By comparing with the characteristics of typical orogenic gold deposits， it is considered that the genetic type of the Machang gold deposit belongs to orogenic gold deposits. |
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