Frequent euxinia in southern Neo-Tethys Ocean prior to the end-Permian biocrisis: Evidence from the Spiti region, India

Frequent euxinia in southern Neo-Tethys Ocean prior to the end-Permian biocrisis: Evidence from the Spiti region, India
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二叠纪末生物危机之前,新特提斯洋南部频繁出现赤潮:来自印度斯皮蒂地区的证据

DOI:
10.1016/j.palaeo.2018.11.030
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发表时间:
2019
期刊:
Palaeoecology
影响因子:
--
通讯作者:
Hannigan, Robyn
Hannigan, Robyn
中科院分区:
--
文献类型:
--
作者:
Stebbins, Alan;Williams, Jeremy;Brookfield, Michael;Nye, Steven W.;Hannigan, Robyn

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在这项研究中,我们重建水柱氧的可用性在晚二叠世页岩沉积(吴家坪至约早期长兴)使用沉积黄铁矿(FeS 2)的地球化学和形态。沉积的页岩发生在二叠纪末大规模灭绝之前,在南部新特提斯洋(Spiti地区,喜马偕尔邦,印度)。我们发现,黄铁矿硫与有机碳的比值(Spyr/Corg)和黄铁矿硫同位素组成(δ 34 Spyr)并没有记录Spiti剖面氧可用性的变化。这是由于现代氧化风化作用和成岩黄铁矿形成作用去除了原始黄铁矿硫,使原始δ 34 Spyr值被淹没。然而,黄铁矿framoboid大小分布是一个可靠的记录古氧化还原条件。氧限制的程度随着多次短暂的缺氧事件而变化,这些事件中断了贡日组上段顶部附近(大约是Wuchiapingian晚期到Changhsingian早期)的主要氧-氧异常趋势。这些短暂的富氧间隔提供了重要的见解和区域证据的环境压力和不稳定的南部新特提斯以及二叠纪末大规模灭绝之前。
In this study, we reconstruct water-column oxygen availability during the deposition of Late Permian shales (Wuchiapingian to approximately early Changhsingian) using the geochemistry and morphology of sedimentary pyrite (FeS2). Deposition of the shales occurred prior to the end-Permian mass extinction within the southern Neo-Tethys Ocean (Spiti region, Himachal Pradesh, India). We found that the variability of pyritic sulfur to organic carbon (Spyr/Corg) and the pyritic sulfur isotopic composition (δ34Spyr) did not record changes in oxygen availability at Spiti sections. This was due to the removal of original pyritic sulfur by modern oxidative weathering and diagenetic pyrite formation which overwhelmed the original δ34Spyrvalues. However, pyrite framboid size distributions was a reliable recorder of paleoredox conditions. The degree of oxygen limitation varied with multiple transient euxinic events interrupting a predominantly oxic-dysoxic trend near the top of the Gungri Formation upper member (approximately late Wuchiapingian to early Changhsingian). These transient euxinic intervals provide important insight and regional evidence of environmental stress and instability in the southern Neo-Tethys well prior to the end-Permian mass extinction.
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