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碳酸盐型铅锌矿的铀铅地质年代学揭示了早古生代东亚的板块构造演化。

U-Pb geochronology of carbonate-hosted Pb-Zn ores reveals plate-tectonic evolution of eastern Asia during the early Paleozoic.

作者信息

Li Bin, Zhang Wen-Dong, Zhao Jian-Xin, Liu Peng, Feng Jing-Ping, Feng Yue-Xing, Xiao Yang

机构信息

Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Ministry of Education), School of Geosciences and Info-Physics, Central South University, Changsha, 410083, China.

College of Geology and Mining Engineering, Xinjiang University, Urumqi, 830047, China.

出版信息

Sci Rep. 2024 Oct 25;14(1):25313. doi: 10.1038/s41598-024-76170-x.

DOI:10.1038/s41598-024-76170-x
PMID:39455659
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11511925/
Abstract

The Mississippi Valley-type (MVT) deposits reached their maximum abundance during the final assembly of Pangea. The intense orogenic activity during this assembly in relatively low latitudes created abundant opportunities for the migration of sedimentary brines into the interior carbonate platforms landward of the orogenic belts, leading to the formation of MVT deposits. Thus, dating the MVT deposits can potentially aid in the reconstruction of the plate tectonic evolution during the assembly of Pangea. The Yangtze Craton hosts significant carbonate-hosted Zn-Pb deposits (> 60 Mt Pb + Zn metals), accounting for 30% of China's Zn-Pb resources. However, determining the timing of zinc and lead mineralization in these reservoirs is challenging. This study employs LA-ICP-MS U-Pb geochronology on calcites to date Zn-Pb deposits hosted in Lower Cambrian limestone in the Huayuan orefield. Three generations of calcite formation were dated: the first recorded the pre-ore deposition of Lower Cambrian limestone at 517 ± 10 Ma, the second marked a hydrothermal event linked to stratiform sphalerite ore formation at 501.4 ± 8.4 Ma, and the third was associated with discordant breccia-hosted Zn-Pb mineralization at 397.5 ± 9.6 Ma. Our results indicate that Paleozoic carbonate-hosted Pb-Zn mineralization in the Yangtze Craton is linked to (1) the final assembly of Gondwana in the late Cambrian-early Ordovician (520-480 Ma); and (2) the intracontinental orogeny response to Jiangnan Uplift (420-400 Ma). This study highlights the temporal relationship between low temperature carbonate-hosted mineralization and orogenic events that are consistent with classic MVT models worldwide. It also contributes geochronological data for the reconstruction of plate-tectonic evolution during Pangea assembly. Furthermore, it demonstrates the potential of in situ U-Pb calcite geochronology to date ore deposits lacking syn-ore minerals suitable for traditional dating methods.

摘要

密西西比河谷型（MVT）矿床在泛大陆最终聚合期间达到了最大丰度。在相对低纬度地区的这次聚合过程中，强烈的造山活动为沉积卤水向造山带内陆方向的内部碳酸盐台地迁移创造了大量机会，从而导致了MVT矿床的形成。因此，确定MVT矿床的年代可能有助于重建泛大陆聚合期间的板块构造演化。扬子克拉通拥有大量以碳酸盐岩为容矿岩石的锌铅矿床（铅锌金属量>6000万吨），占中国锌铅资源的30%。然而，确定这些矿床中锌和铅矿化的时间具有挑战性。本研究采用激光剥蚀电感耦合等离子体质谱（LA-ICP-MS）U-Pb年代学方法对花垣矿田下寒武统石灰岩中的锌铅矿床进行方解石测年。确定了三代方解石的形成时间：第一代记录了下寒武统石灰岩在517±10Ma的成矿前沉积，第二代标志着与层状闪锌矿矿石形成相关的热液事件，时间为501.4±8.4Ma，第三代与不协调角砾岩型锌铅矿化有关，时间为397.5±9.6Ma。我们的结果表明，扬子克拉通古生代以碳酸盐岩为容矿岩石的铅锌矿化与（1）寒武纪晚期-奥陶纪早期（520-480Ma）冈瓦纳大陆的最终聚合；以及（2）对江南造山运动的陆内造山响应（420-400Ma）有关。本研究突出了低温碳酸盐岩容矿矿化与造山事件之间的时间关系，这与全球经典的MVT模型一致。它还为重建泛大陆聚合期间的板块构造演化提供了地质年代学数据。此外，它展示了原位U-Pb方解石年代学在对缺乏适合传统测年方法的同矿矿物的矿床进行测年方面的潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef13/11511925/9f63b17f3578/41598_2024_76170_Fig9_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef13/11511925/918885bd17d0/41598_2024_76170_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef13/11511925/038147c84a7e/41598_2024_76170_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef13/11511925/be356120474a/41598_2024_76170_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef13/11511925/1489c5d63c4f/41598_2024_76170_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef13/11511925/9f63b17f3578/41598_2024_76170_Fig9_HTML.jpg

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