| 吕小军,周勇,王玉山,程仕俊,金飞,陈泽军.冕宁尤黑木铁铜铅锌多金属矿床成矿时代探讨——基于磷灰石LA-ICP-MS U-Pb定年[J].地质找矿论丛,2023,38(3):309-318 |
| 冕宁尤黑木铁铜铅锌多金属矿床成矿时代探讨——基于磷灰石LA-ICP-MS U-Pb定年 |
| Apatite LA-ICP-MS U-Pb dating-based discussion on metallogenic epoch of Youheimu Fe-Cu-Pb-Zn polymetallic deposit in Mianning county, Sichuan province |
| 投稿时间：2022-11-28 |
| DOI：10.6053/j.issn.1001-1412.2023.03.006 |
| 中文关键词: 铁铜铅锌多金属矿床 磷灰石U-Pb定年 成矿时代 尤黑木地区 四川省 |
| 英文关键词:Fe-Cu-Pb-Zn polymetallic deposit apatite U-Pb dating Metallogenic epoch Youheimu area Sichuan province |
| 基金项目:“四川省攀枝花—凉山州地区铜、镍、铅锌、金、萤石矿产资源勘察选区”项目资助。 |
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| 中文摘要: |
| 扬子板块西缘的康滇铁铜成矿带是我国重要的富铜和富铁矿石产地之一,但其多个矿床的成矿时代和矿床成因仍存在争议。位于四川冕宁的尤黑木铁铜铅锌多金属矿为一小型矿床,前人对它的研究与报道极少,其成矿时代问题尚未解决。本文对该矿床铁铜矿体中的磷灰石进行了地球化学及原位LA-ICP-MS U-Pb定年研究。结果表明,尤黑木铁铜矿体中的磷灰石多呈不规则粒状,在磷灰石SiO2-FeO和SiO2-MnO成因判别图解中,均分布于热液磷灰石区域,表明为典型的热液磷灰石,其LA-ICP-MS U-Pb下交点年龄为698 Ma±15 Ma,代表铁铜矿体的成矿年龄。综合分析认为研究区东部酸性岩浆带来的热液流体顺着围岩层间破碎带流入,与围岩发生交代作用及矽卡岩化,形成尤黑木铁铜矿矿体;矿床成因为岩浆热液-矽卡岩成因。 |
| 英文摘要: |
| Kang-Dian Fe, Cu polymetallic ore belt at West margin of Yangtze block is one of the producing areas of rich Fe and Rich Cu ore in China. However metallogenic epoch and genesis of many such deposits here are still controversial. Youheimu Fe-Cu-Pb-Zn deposit is a small one in Mianning county. About study and report of the deposit is rare and it's metallogenic epoch is problematic up to now. This paper deals with geochemistry of the apatite and the in situ apatite LA-ICP-MS Pb dating. The apatite generally occur in irregular grain and the values of SiO2-FeO and SiO2-MnO fall in the field of hydrothermal apatite in the discrimination diagram. It is a typical hydrothermal apatite. The lower LA-ICP-MS U-Pb intersection point age is 698 Ma±15 Ma. The age is the Metallogenic age. It is comprehensively considered that hydrothermal fluid from magma in the east of the study area move along interformational fractural zone of the wall rock and react with the wall rock etasomatically and skarn and Youheimu Fe-Cu-Pb-Zn polymetallic deposit formed. It is genetically a hydrothermal-skarn type deposit. |
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