大火成岩省及其在古大陆重建及裂解研究中的应用
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本文为国家自然科学基金资助项目(编号: 41725011, 41920104004)的成果


A review on large igneous provinces (LIPs) and their implications for paleogeographic reconstruction and continental breakup
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    摘要:

    大火成岩省是地质历史上与地球深部过程(如地幔柱)密切相关的极端地质事件,以相对较短时期内形成规模宏大的板内幔源基性岩浆活动为主要特征,对研究全球性大气—海洋环境的巨变与生物灭绝、大规模成矿及超大陆的重建和裂解均有重要意义。从潘吉亚超大陆的裂解过程可以看出,尽管不是所有的大火成岩省都与大陆裂解有关,但几乎每一次重要的裂解事件都伴有大火成岩省的出现,因此大火成岩省对于研究前潘吉亚超大陆,特别是对于缺少古生物等重建标志,古地磁数据偏少的前寒武纪超大陆重建及裂解研究有重要价值。近20多年来随着年代学技术的进步及研究工作的不断深入,大火成岩省在古大陆重建及裂解方面取得了一些重要进展,并发挥了越来越重要的作用。前寒武纪大火成岩省由于经历了多次裂解事件改造及后期抬升剥蚀或覆盖的影响,现今保留的是一些分散在不同大陆上的大火成岩省残片或碎片。用大火成岩省开展古大陆重建及裂解的目标就是通过不同陆块大火成岩省或大规模基性岩浆活动的年代学、岩石学及地球化学对比,结合其他证据,恢复大火成岩省形成时的时空分布特征,据此来确定这些陆块在超大陆中的相对或绝对位置。与其他前寒武纪大陆重建标志相似,大火成岩省也有一些局限性及不确定性,因此应用大火成岩省开展古大陆重建及裂解研究中要与前岩浆期沉积地层中的特殊事件层(如冰碛岩、火山灰、黑色页岩、不整合面、古生物等)对比、岩墙几何学产状、基性岩浆事件序列对比、古地磁、大型构造(如造山带)对比及深部地球物理等多学科方法相结合。

    Abstract:

    Large igneous provinces (LIPs) represent extreme geological events in Earth’s history and are usually related to deep processes such as mantle plumes. They are composed of large volumes of intraplate mafic magmatic rocks (sills, dykes or flood lavas) formed during relatively short duration and are of great significances for studying global atmosphere—ocean climate change and mass extinction, large- scale metallogeny as well as paleogeographic reconstruction and continental breakup. The dispersal history of Pangea supercontinent from ~200 Ma shows that although not all LIPs were related to continental breakup, almost every major breakup event was accompanied by LIP. Therefore, LIPs can be used as an important tool for studying the paleogeographic reconstruction and continental breakup of pre- Pangea supercontinents, especially for the Precambrian supercontinents that lack other reliable evidence such as paleontology, glacial deposits and abundant paleomagnetic results. From last 20 years, more and more LIPs have been identified from different cratons, and comparisons of these LIPs have provided important constraints on paleogeographic reconstruction and breakup history of the Precambrian supercontinents. Due to multiple stages of continental breakup, erosion or covered by young basins, the Precambrian LIPs usually occur as LIP fragments/remnants as represented by intraplate mafic events consisting of mafic dykes, sills or occasionally mafic lavas. Geochronogical, petrological and geochemical comparisons of LIP fragments/remnants in different cratons combined with other evidence can be used to recover the original temporal and spatial distributions of LIPs across different cratons, and can therefore provide important constraints on paleo- positions of these cratons in the Precambrian supercontinents. Similar to other tools for Precambrian paleogeographic reconstruction, there are some restrictions or uncertainness in using LIPs as tools for paleogeographic reconstruction and continental breakup. Therefore, when using LIPs as robust tools for Precambrian paleogeographic reconstruction and continental breakup, other evidence such as paleomagnetic data, geometry of mafic dykes, similarities between special geological events (glacial deposits, black shales, tuff layers, fossils, disconformity or unconformity, etc. ) recorded in pre- LIPs strata, comparisons of mafic magmatic sequences and large deformation belts and lithosphere structures revealed by geophysical methods should also be considered as possible.

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张拴宏,赵越,裴军令,王宏宇,胡国辉,张琪琪,蔡瑜杭,孔令昊,王森,王开.2022.大火成岩省及其在古大陆重建及裂解研究中的应用[J].地质论评,68(5):1634-1652,[DOI].
ZHANG Shuanhong, ZHAO Yue, PEI Junling, WANG Hongyu, HU Guohui, ZHANG Qiqi, CAI Yuhang, KONG Linghao, WANG Sen, WANG Kai.2022. A review on large igneous provinces (LIPs) and their implications for paleogeographic reconstruction and continental breakup[J]. Geological Review,68(5):1634-1652.

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  • 收稿日期:2022-06-07
  • 最后修改日期:2022-07-03
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  • 在线发布日期: 2022-09-19
  • 出版日期: 2022-09-15