Melt extraction and mineralization: A case study from the Shuangjianzishan supergiant Ag-Pb-Zn deposit (208 Mt), Inner Mongolia, NE China

IF 4.6 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
China Geology Pub Date : 2023-10-01 DOI:10.31035/cg2022044
Meng Dai , Guang-sheng Yan , Yong-sheng Li , Wen-bin Jia , Fan-yu Qi , Xing Ju
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引用次数: 0

Abstract

The supergiant Shuangjianzishan (SJZ) Ag-Pb-Zn deposit is in the southern segment of the Great Hinggan Range (SGHR), northeast China. Previous studies suggest the ore-forming material and fluid originated from the magmatic system, and the mineralization age was consistent with the diagenetic age. However, the relationship between granitic magmatism and mineralization is still unclear in the SJZ. In this study, C-H-O-He-Ar and in-situ S-Pb isotope analyses were conducted to determine the sources of ore-forming fluids and metals, which were combined with geochemistry data of SJZ granitoids from previous studies to constrain the relationship between the magmatism and the mineralization. The C-H-O-He-Ar-S-Pb isotopic compositions suggested the SJZ ore-forming material and fluids were derived from a magmatic source, which has mixed a small amount of mantle-derived materials. In addition, the disseminated sulfide from the syenogranite has comparable S-Pb isotopic composition with the sulfide minerals from ore veins, suggesting that the generation of the SJZ ore-forming fluids has a close relationship with the syenogranite magmatism. Combining with the geochemical characters of the syenogranite, the authors proposed that the mantle-derived fingerprint of the SJZ ore-forming fluid might be caused by the parent magma of the syenogranite, which was derived from partial melting of the juvenile lower crust, and underwent the residual melts segregated from a crystal mush in the shallow magma reservoir. The extraction of the syenogranite parent magma further concentrated the fertilized fluids, which was crucial to mineralization of the SJZ Ag-Pb-Zn deposit.

©2023 China Geology Editorial Office.

熔融萃取与成矿作用:中国东北内蒙古双尖子山超大型银铅锌矿床(208 Mt)案例研究
超大型双尖子山银铅锌矿床位于中国东北大兴安岭南段。以往的研究表明,成矿物质和流体来源于岩浆系统,成矿时代与成岩时代一致。然而,上海金东区花岗岩岩浆与成矿之间的关系尚不清楚。本研究开展了C-H-O-He-Ar和原位S-Pb同位素分析,以确定成矿流体和金属的来源,并结合以往研究中SJZ花岗岩的地球化学数据,对岩浆与成矿之间的关系进行了约束。C-H-O-He-Ar-S-Pb同位素组成表明,SJZ的成矿物质和流体来自岩浆源,其中混合了少量地幔源物质。此外,正长岩中的浸染状硫化物与矿脉中的硫化物矿物具有相似的S-Pb同位素组成,表明SJZ成矿流体的生成与正长岩岩浆作用有着密切的关系。结合正长花岗岩的地球化学特征,作者提出,SJZ成矿流体的地幔源性指纹可能是由正长花岗岩的母岩浆引起的,它来源于幼年下地壳的部分熔融,并经历了浅部岩浆储层中晶泥分离出的残余熔体。正长岩母岩的提取进一步浓缩了肥沃流体,这对SJZ银铅锌矿床的成矿至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
China Geology
China Geology GEOLOGY-
CiteScore
7.80
自引率
11.10%
发文量
275
审稿时长
16 weeks
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