Enhanced continental weathering and large igneous province induced climate warming at the Permo-Carboniferous transition
Enhanced continental weathering and large igneous province induced climate warming at the Permo-Carboniferous transition
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DOI：
10.1016/j.epsl.2020.116074
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发表时间：
2020-03
影响因子：
5.3
通讯作者：
Jianghai Yang;Peter A. Cawood;I. Montañez;D. Condon;Yuansheng Du;Jiaxin Yan;Shaoquan Yan;Dong-xun Yuan
中科院分区：
文献类型：
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作者：
Jianghai Yang;Peter A. Cawood;I. Montañez;D. Condon;Yuansheng Du;Jiaxin Yan;Shaoquan Yan;Dong-xun Yuan
追踪气候变化及其与化学风化和大规模火山活动的深层关系，极大地提高了我们对地球气候系统的理解。二叠纪-石炭纪是百万年冰期-冰期旋回和大规模玄武岩火山活动的关键时期，如斯卡格拉克中心（也称为斯卡格拉克或日特兰）大火成岩省。为了探讨这一时期的火山-气候相互作用，我们对华北南部上宾夕法尼亚-下二叠世边缘海相序列的3个凝灰岩层进行了高精度CA-TIMS U-Pb锆石年龄测定。这些年龄校正了华北地区~ 301 ~ 296 Ma的二叠纪-石炭系生物地层。从这一岩心序列中筛选泥岩样品及其计算的风化指标值，对源区景观的风化趋势进行了约束，表明在~ 299 ~ 296.5 Ma期间，源区化学风化强度迅速增加，随后下降。这些趋势与南冈瓦纳冰川记录、低纬度温度变化、相对海平面变化和大气二氧化碳的变化相吻合，它们共同记录了二叠纪早期的气候变暖-变冷扰动，温度最大值在~ 298 Ma。二叠纪-石炭纪冰窖的气候变暖与以斯卡格拉克为中心的大火成岩省的就位有关，后者可能释放了大量的二氧化碳，导致了二叠纪-石炭纪过渡期间的气候变暖。紧随其后的降温可能是由于该省热带纬度地区大量玄武岩在火山爆发后的快速风化作用，这将隔绝大气中的二氧化碳，并促进回到更凉爽的冰窖条件。这项研究支持了这样一种断言，即大规模玄武岩火山活动可能首先导致气候迅速变暖，然后可能像之前对德干圈闭和中大西洋岩浆省提出的那样，产生总体净降温效应。
Tracking climate change and its relationships with chemical weathering and massive volcanic activity in deep-time greatly improves our understanding of the Earth's climate system. The Permo-Carboniferous period is a critical time interval with million year-scale glacial-deglacial cycles and massive basaltic volcanism, such as the Skagerrak-Centered (also named Skagerrak or Jutland) large igneous province. To explore the volcanism-climate interactions in this period, we obtained high precision CA-TIMS U-Pb zircon ages for three tuffaceous layers from a cored upper Pennsylvanian-lower Permian marginal marine succession in southern North China. These ages calibrate the Permo-Carboniferous biostratigraphy between ∼301–296 Ma in North China. From this dated core succession, mudrock samples and their calculated weathering index values were screened to constrain the weathering trends for the source landscapes and demonstrate a rapid increase with a subsequent decrease in source chemical weathering intensity during the period of ∼299 to 296.5 Ma. These trends coincide with the southern Gondwana glacial records, low latitude temperature changes, relative sea-level variations, and shifts in atmosphericpCO2that together document an earliest Permian climate warming-cooling perturbation with a temperature maximum at ∼298 Ma. This climate warming in the Permo-Carboniferous icehouse correlates with the emplacement of the Skagerrak-Centered large igneous province, which likely released voluminous CO2that led to climate warming during the Permo-Carboniferous transition. The immediately following cooling could possibly result from the rapid post-eruptional weathering of the massive basaltic rocks of this province in tropical latitudes, which would have sequestered atmospheric CO2and promoted return to cooler icehouse conditions. This study supports the assertation that massive basaltic volcanism could first cause rapid climate warming and then may have an overall net cooling effect as previously suggested for the Deccan Traps and the Central Atlantic Magmatic Province.