Negative C-isotope excursions at the Permian-Triassic boundary linked to volcanism

Negative C-isotope excursions at the Permian-Triassic boundary linked to volcanism
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二叠纪-三叠纪边界的负C同位素偏移与火山活动有关

DOI:
10.1130/g33329.1
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发表时间:
2012-11
期刊:
影响因子:
5.8
通讯作者:
Qinglai Feng
Qinglai Feng
中科院分区:
地球科学1区
文献类型:
--
作者:
Jun Shen;Thomas J Algeo;Qing Hu;Ning Zhang;Lian Zhou;Wenchen Xia;Qinglai Feng

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来自中国南方的两个二叠纪-三叠纪界线(PTB)剖面提供了有关碳酸盐和有机碳同位素记录中与地球历史上最大规模灭绝相关的负偏移起源的见解。Xiakou,碳酸盐斜坡部分,显示三角洲C-13(碳水化合物)偏移高达千分之-2,新民,深陆架部分,显示三角洲C-13(有机物)偏移高达千分之-6。在这两个部分中,这些偏移与火山灰层有关,偏移大小与灰层厚度成比例。这些关系记录了PTB危机期间火山活动对地球表面碳循环的直接影响。以往对华南PTB剖面火山灰层的研究都认为是东特提斯区域俯冲带火山作用的来源,但我们的分析表明,这些火山灰层可能代表西伯利亚圈闭大规模爆发的远源沉积。如果通过进一步的调查证实,这一假设将有重要的意义,无论是在PTB危机的杀伤机制,以及细化的西伯利亚圈闭的喷发历史。
Two Permian-Triassic boundary (PTB) sections from south China provide insights regarding the origin of negative excursions in carbonate and organic carbon isotope records associated with the largest mass extinction in Earth history. Xiakou, a carbonate ramp section, exhibits delta C-13(carb) excursions of up to -2 parts per thousand, and Xinmin, a deep-shelf section, exhibits delta C-13(org) excursions of up to -6 parts per thousand. In both sections, these excursions are associated with volcanic ash layers, and excursion size scales with ash layer thickness. These relationships document the direct influence of volcanism on the Earth-surface carbon cycle during the PTB crisis. Previous studies of ash layers in south China PTB sections have invoked a source in regional subduction-zone volcanism in the eastern Tethys, but our analysis suggests that these ash layers may represent distal deposits from large-scale explosive eruptions of the Siberian Traps. If confirmed by further investigation, this hypothesis would have important implications both for kill mechanisms during the PTB crisis as well as for refinement of the eruption history of the Siberian Traps.
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