Mineralization age and genesis of the makeng-style iron deposits in the Paleo-Pacific tectonic domain of South China: In situ LA-ICPMS garnet U-Pb chronological and geochemical constraints
Mineralization age and genesis of the makeng-style iron deposits in the Paleo-Pacific tectonic domain of South China: In situ LA-ICPMS garnet U-Pb chronological and geochemical constraints
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DOI：
10.3389/feart.2022.1027620
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发表时间：
2023-01
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影响因子：
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通讯作者：
Sen Wang;K. Cao;Da Zhang;Jinjun Yi;Bojie Hu;Jing Yang;Meng-Ying Cai;Yaoyao Zhang;Yuan Yuan-Yuan;Tian-Wang Pan
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文献类型：
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作者：
Sen Wang;K. Cao;Da Zhang;Jinjun Yi;Bojie Hu;Jing Yang;Meng-Ying Cai;Yaoyao Zhang;Yuan Yuan-Yuan;Tian-Wang Pan
为揭示古太平洋构造域中国东南部马坑式铁多金属矿床的成因，对马坑、洛阳、大牌和潘田矿床进行了LA-ICPMS石榴石U-Pb定年和稀土元素分析的新分析方法。对矿床中9个石榴石夕卡岩样品的U-Pb定年结果表明，马坑式铁多金属矿床主要形成于137~130 Ma，这与锆石U-Pb和辉钼矿Re-Os年龄一致。与以往对矿田花岗岩的锆石U-Pb定年研究相比，本研究为成矿时代以及成矿与花岗岩的关系提供了更直接的证据。马坑、洛阳、大牌和潘田矿床的4个代表性石榴石样品的稀土元素(REE)分析结果和稀土元素模式表明，它们与典型的矽卡岩矿床相似，但稀土元素分布类型的明显差异表明，这些马坑式矿床的成矿流体可能因不同的成矿流体而不同。我们新的石榴石U-Pb测年和稀土元素分析结果不仅为马坑式矿床的成矿时代和成因提供了新的证据，而且对于推动U-Pb测年方法在矽卡岩型矿床研究中的应用具有重要意义。
To reveal the genesis of Makeng-style iron polymetallic deposits from SE China in the paleo-Pacific tectonic domain, a new analytical method of LA-ICPMS garnet U-Pb dating and rare Earth element analysis was conducted for the Makeng, Luoyang, Dapai and Pantian deposits. The U-Pb dating results of nine garnet skarn samples from these deposits suggested that the Makeng-style iron polymetallic deposits mainly formed during 137–130 Ma, which is consistent with the zircon U-Pb and molybdenite Re-Os ages. This study provides more direct evidence of the mineralization age and the relationship between mineralization and granite, compared with previous studies on the zircon U-Pb dating for granites in the ore fields. Rare Earth element (REE) analysis results and REE patterns of four representative garnet samples from the Makeng, Luoyang, Dapai and Pantian deposits show that they are similar to typical skarn deposits, but obvious differences in the REE distribution types indicate that the ore-forming process may be distinct due to different mineralizing fluid for these Makeng-style deposits. Our new garnet U-Pb dating and rare Earth element analysis result not only provides new evidence for the mineralization age and genesis of the Makeng-style deposits but is also of great significance to promote the application of U-Pb dating methods to research skarn type deposits.