Lipeng Zhang , Yuxiao Chen , Rongqing Zhang , Kun Wang , Yongjun Luo , Congying Li , Jinlong Liang
{"title":"The Jurassic Gangmei Mo-W deposit in Guangdong Province and its implication for Mo-W mineralization in South China","authors":"Lipeng Zhang , Yuxiao Chen , Rongqing Zhang , Kun Wang , Yongjun Luo , Congying Li , Jinlong Liang","doi":"10.1016/j.sesci.2022.03.001","DOIUrl":null,"url":null,"abstract":"<div><p>South China developed large-scale Mesozoic magmatism and polymetallic mineralization, especially Jurassic W-Sn and Mo-W mineralization. Compared with W-Sn deposits, Mo-W deposits in South China have received less attention. The recently discovered Gangmei Mo-W deposit, which occurred in Guangdong Province, is the southernmost Jurassic Mo-W mineralization in South China. Here, we report the molybdenite Re-Os isotopic age of the Gangmei deposit and compile the Mo-W- and W-Sn-associated deposits in South China and their Re concentrations in molybdenites, aiming at constraining the ore-forming age of the Gangmei deposit, the scope of Mo-W mineralization in South China and the possible controlling factors of different mineralization types. Four molybdenite samples from the Gangmei deposit were chosen for Re-Os isotopic dating. The Re-Os model ages vary from 162.6 ± 1.6 Ma to 164.1 ± 1.6 Ma with a weighted mean age of 163.1 ± 1.4 Ma and yield an isochron age of 162.2 ± 4.1 Ma (MSWD = 1.01), consistent with the emplacement age of the Gangmei intrusion, indicating a genetic relationship between magmatic activity and mineralization. This age also agrees well with the large-scale Jurassic Mo-W- and W-Sn-associated mineralization in South China, suggesting that the scope of Jurassic Mo-W-associated mineralization can reach the southernmost part of South China. Rhenium concentrations in molybdenites from Jurassic Mo-W-associated and W-Sn-associated deposits in South China suggest that their magma sources are different, and Mo-W-associated deposits may involve more mantle-derived materials. In addition, oxygen fugacity may be another factor controlling different types of mineralization in South China.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":null,"pages":null},"PeriodicalIF":2.0000,"publicationDate":"2022-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X22000101/pdfft?md5=57afab5cdd479626bbc1383a16cf6a99&pid=1-s2.0-S2451912X22000101-main.pdf","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solid Earth Sciences","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2451912X22000101","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 2
Abstract
South China developed large-scale Mesozoic magmatism and polymetallic mineralization, especially Jurassic W-Sn and Mo-W mineralization. Compared with W-Sn deposits, Mo-W deposits in South China have received less attention. The recently discovered Gangmei Mo-W deposit, which occurred in Guangdong Province, is the southernmost Jurassic Mo-W mineralization in South China. Here, we report the molybdenite Re-Os isotopic age of the Gangmei deposit and compile the Mo-W- and W-Sn-associated deposits in South China and their Re concentrations in molybdenites, aiming at constraining the ore-forming age of the Gangmei deposit, the scope of Mo-W mineralization in South China and the possible controlling factors of different mineralization types. Four molybdenite samples from the Gangmei deposit were chosen for Re-Os isotopic dating. The Re-Os model ages vary from 162.6 ± 1.6 Ma to 164.1 ± 1.6 Ma with a weighted mean age of 163.1 ± 1.4 Ma and yield an isochron age of 162.2 ± 4.1 Ma (MSWD = 1.01), consistent with the emplacement age of the Gangmei intrusion, indicating a genetic relationship between magmatic activity and mineralization. This age also agrees well with the large-scale Jurassic Mo-W- and W-Sn-associated mineralization in South China, suggesting that the scope of Jurassic Mo-W-associated mineralization can reach the southernmost part of South China. Rhenium concentrations in molybdenites from Jurassic Mo-W-associated and W-Sn-associated deposits in South China suggest that their magma sources are different, and Mo-W-associated deposits may involve more mantle-derived materials. In addition, oxygen fugacity may be another factor controlling different types of mineralization in South China.
华南发育大规模中生代岩浆活动和多金属成矿作用,尤以侏罗纪W-Sn和Mo-W成矿作用最为突出。与钨锡矿床相比,中国南方的钼钨矿床受到的关注较少。新近发现的广东港美钼钨矿是华南最南端的侏罗系钼钨矿化。本文报道了刚美矿床辉钼矿Re- os同位素年龄,整理了华南钼矿Mo-W-和w - sn伴生矿床及其在辉钼矿中的Re含量,旨在约束刚美矿床的成矿年龄、华南钼矿的成矿范围以及不同成矿类型可能的控制因素。选取港美矿床的4个辉钼矿样品进行了Re-Os同位素定年。Re-Os模型年龄变化范围为162.6±1.6 Ma ~ 164.1±1.6 Ma,加权平均年龄为163.1±1.4 Ma,等时线年龄为162.2±4.1 Ma (MSWD = 1.01),与岗美岩体侵位年龄一致,表明岩浆活动与成矿作用存在成因关系。这一时代也与华南侏罗系Mo-W-和w - sn -成矿作用吻合较好,表明侏罗系Mo-W-成矿作用范围可达华南最南端。华南侏罗系mo - w -伴生矿床和w - sn -伴生矿床中辉钼矿的铼含量表明它们的岩浆来源不同,mo - w -伴生矿床可能涉及更多的幔源物质。此外,氧逸度可能是控制华南不同矿化类型的另一个因素。