Environmental perturbations during the latest Permian: Evidence from organic carbon and mercury isotopes of a coal-bearing section in Yunnan Province, southwestern China
Environmental perturbations during the latest Permian: Evidence from organic carbon and mercury isotopes of a coal-bearing section in Yunnan Province, southwestern China
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二叠纪末期的环境扰动：来自中国西南部云南省煤层的有机碳和汞同位素的证据
DOI：
10.1016/j.chemgeo.2020.119680
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发表时间：
2020-09
期刊：
影响因子：
3.9
通讯作者：
Ruoyu Sun
中科院分区：
文献类型：
--
作者：
Xue Zheng;Shifeng Dai;Victor Nechaev;Ruoyu Sun
二叠纪末大灭绝（EPME）是突然的，但在此之前，生态恢复力已经减弱。晚二叠世是华南及邻区重要的成煤地质时期，与广泛的火山活动密切相关。本文对云南连营煤田含煤剖面的有机碳、汞同位素、元素地球化学和矿物学进行了系统分析。火山碎屑岩夹矸岩有机碳δ 13 C值负移了−25.22‰ ~ −25.99‰，与Eu负异常（0.48-0.52）、Hg显著富集（130-352 ppb）和Δ 199 Hg接近于零（−0.08-0.07‰）几乎同步。这些C和Hg同位素异常以及相关的地球化学特征（由特征Al 2 O3/TiO 2、Zr/TiO 2和Nb/Yb比表现出来）可能是由俯冲或碰撞相关的火山作用引起的。我们的研究为EPME出现之前的火山活动提供了证据，EPME在强调环境方面发挥了重要作用，从而减少了最新二叠纪的生态恢复力。
The end-Permian mass extinction (EPME) is sudden, but prior to which, the ecological resilience has diminished. The Late Permian is an important geologic period for coal formation associated with extensive volcanic activities in South China and adjacent regions. Here we present a systematic analysis of organic carbon and mercury isotopes as well as elemental geochemistry and mineralogy of a coal-bearing section from the Lianying Coalfield in Yunnan Province, South China. The data show that organic carbon δ13C values are negatively shifted by −25.22‰ to −25.99‰ in pyroclastic tonstein partings, which are near-synchronous with the negative Eu anomaly (0.48–0.52), significant Hg enrichment (130–352 ppb) and near-zero Δ199Hg (−0.08–0.07‰). These C and Hg isotope anomalies and associated geochemical signatures, which are manifested by characteristic Al2O3/TiO2, Zr/TiO2, and Nb/Yb ratios, are likely caused by subduction or collision-related volcanism. Our study provides evidence for the occurrences of volcanism before the advent of EPME, which played a significant role in stressing the environment and consequently diminishing the ecological resilience in the latest Permian.
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影响因子：
3.3
作者：
Fenlian Wang;C. Wang;T. Zhao
通讯作者：
Fenlian Wang;C. Wang;T. Zhao
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影响因子：
3.9
作者：
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通讯作者：
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影响因子：
5.3
作者：
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通讯作者：
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影响因子：
3.9
作者：
Dai, Shifeng;Wang, Xibo;Zou, Jianhua
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最近二叠纪生物大灭绝前的华南海洋环境火山扰动及其生物效应
影响因子：
3.7
作者：
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通讯作者：
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