| 大兴安岭南段锡多金属矿床成矿岩体全岩地球化学、锆石U-Pb年龄、Hf同位素特征及其地质意义—以边家大院、毛登、宝盖沟矿床为例 |
| 投稿时间：2024-01-02 修订日期：2024-05-08 |
| 关键词:Southern Greater Xing`an Tin deposits Highly fractionated granite Early Cretaceous |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）92062218, 41672095 |
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| 摘要: |
| Zircon U-Pb ages, whole-rock geochemistry and Hf isotope characteristics of ore-related intrusions in tin deposits, southern Great Xing`an and their geological significance |
| The southern Great Xing’an Range is the most important tin-polymetallic mineralization zone in Northern China, highlighted by the Bianjiadayuan, Baogaigou, and Maodeng deposits. These deposits are closely spatially associated with Yanshanian granitic intrusions. Precision zircon U-Pb isotopic dating of ore-bearing intrusions reveal emplacement ages of 136.9±0.8 Ma, 143.6±0.8 Ma, and 135.0±1.4 Ma for the Bianjiadayuan quartz porphyry, the Baogaigou granite, and the Maodeng granitic porphyry, respectively. According to detailed major element analyses, these granitic intrusions are classified as metaluminous to weak peraluminous, high-K calc-alkaline granites. Trace element studies show an enrichment in LILE and a depletion in HFSE of these intrusions, and they are characterized by pronounced negative Eu anomalies. We classified these granites as highly differentiated I-type granites, based on their whole-rock geochemical characteristics and Zr saturation temperature (753°C~796°C). Zircon Hf isotope analysis(εHf(t)=-0.86~13.7，TDM2=307~1240Ma) suggests that these granitic predominantly originated from partial melting of Neoproterozoic juvenile lower crust. Geochemical and geochronological studies suggest that early Cretaceous highly differentiated I-type granites in the southern Da Hinggan Range show significant potential for tin exploration. |
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