广东陶锡湖锡多金属矿床花岗斑岩锆石U-Pb年代学、地球化学、Hf同位素组成及其地质意义

发布时间：2018-05-14 00:05

本文选题：锆石U-Pb年龄 + 地球化学　；参考：《大地构造与成矿学》2017年03期

【摘要】：陶锡湖锡多金属矿床是粤东锡多金属成矿带内一个与花岗斑岩有关的矿床。本文对与矿化有关的陶锡湖花岗斑岩进行了岩石地球化学、锆石U-Pb年代学和Hf同位素研究。LA-ICP-MS锆石U-Pb定年显示,花岗斑岩侵位年龄为141.8±1.0 Ma,是早白垩世岩浆作用的产物。岩石地球化学特征显示,花岗斑岩属于弱过铝质高钾钙碱性系列,强烈富集Rb、Th、U、K、Pb,亏损Ba、Sr、Ti、P、Nb、Ta,具有明显Eu负异常,属于高分异I型花岗岩。花岗斑岩成矿金属元素丰度值高,属于典型的含锡花岗岩。花岗斑岩锆石εHf(t)从-6.67变化到-2.32,二阶段模式年龄(tDM2)为1343~1615 Ma,表明其成岩物质主要来自古老地壳,可能有少量地幔物质的加入。根据所得地球化学和年代学数据,结合区域构造演化,陶锡湖花岗斑岩及相关的锡多金属矿床形成于古太平洋板块向欧亚大陆俯冲作用有关的区域伸展的动力学背景。
[Abstract]:The Taoxihu tin polymetallic deposit is a granitic porphyry deposit in the tin polymetallic metallogenic belt of eastern Guangdong. In this paper, the mineralization-related granitic porphyry was studied by geochemistry. Zircon U-Pb chronology and HF isotopic study. LA-ICP-MS zircon U-Pb dating shows that the granitic porphyry emplacement age is 141.8 卤1.0Ma. it is the product of early Cretaceous magmatism. The petrogeochemical characteristics show that the granitic porphyry belongs to the weak peraluminous high potassium calc-alkaline series, strongly enriched in the RbSh UKK Pb, and depleted in Bajiu SrTitiao Pao NbPU Ta.It has obvious negative EU anomaly and belongs to the high differentiation I-type granite. Granitic porphyry is a typical tin bearing granite because of its high abundance of metallogenic elements. The zircon 蔚 Hft2) of granitic porphyry varies from -6.67 to -2.32, and the two-stage model age is 13430.1615 Ma, indicating that the diagenetic material mainly comes from the ancient crust and may be joined by a small amount of mantle material. Based on the geochemical and geochronological data and the regional tectonic evolution, the granitic porphyry and the associated tin polymetallic deposits were formed in the regional extensional dynamic setting related to the subduction of the paleo-Pacific plate to the Eurasian continent.
【作者单位】：中国科学院广州地球化学研究所矿物学与成矿学重点实验室;中国科学院大学;广东省有色金属地质局;广东省有色金属地质局931队;
【基金】：中国地质调查局整装勘查关键基础地质研究项目(12120114015901)资助
【分类号】：P597;P618.2

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