Ostracod fauna across the Permian-Triassic boundary at Chongyang, Hubei Province, and its implication for the process of the mass extinction
Ostracod fauna across the Permian-Triassic boundary at Chongyang, Hubei Province, and its implication for the process of the mass extinction
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湖北崇阳二叠纪-三叠纪界线介形类动物群及其对大灭绝过程的意义
DOI：
10.1007/s11430-010-0045-8
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发表时间：
2010-04
期刊：
影响因子：
--
通讯作者：
Zhang Suxin
中科院分区：
文献类型：
--
作者：
Liu Hao;Wang Yongbiao;Yuan Aihua;Yang Hao;Song Haijun;Zhang Suxin
通过对崇阳剖面二叠-三叠系界线岩石样品进行热醋酸解，分离出440个化石标本，鉴定出介形虫10属30种。在长兴组灰岩中发现6属20种，在主要动物群灭绝层之上发现7属11种。崇阳剖面的介形虫组合与广西和重庆地区同期微生物岩中的介形虫组合有明显的不同，不仅介形虫的组成不同，而且滤食性介形虫相对于沉积食性介形虫的丰度也不同，这是海水含氧量的一个指标。介形虫组合的这种空间差异可能反映了二叠纪末生物大灭绝后海洋环境条件的多样性。介形虫分别在主灭绝层以下200 cm和附近以及微生物岩顶部消失，显示了崇阳剖面的幕式和渐进式塌陷过程。碳同位素组成出现在主灭绝层以下200 cm处，表明海洋环境开始恶化。碳同位素组成的波动与介形虫种类的幕式演化有明显的相关性，但与介形虫丰度的关系不大。
Thirty species of 10 ostracod genera were identified from 440 fossil specimens isolated through the hot acetolysis of the rock samples collected across the Permian-Triassic boundary at Chongyang section. Twenty species of 6 genera are found to occur in the limestone of Changxing Formation, and 11 species of 7 genera above the main faunal mass extinction horizon. The ostracod assemblages identified at the Chongyang section are obviously different from those previously reported in the contemporaneous microbialites in Guangxi and Chongqing regions, not only in the ostracod components but also in the abundance of filter-feeding ostracods relative to the deposit-feeding ostracods, an indicator of the oxygen level of the seawater. This spatial difference in ostracod assemblages might reflect the diversity of oceanic environmental conditions after the end-Permian mass extinction. Ostracods disappear at 200 cm below and near the main mass extinction horizon, and on the top of the microbialites, respectively, showing an episodic and gradual collapse process at the Chongyang section. The carbon isotope composition is found to appear at 200 cm below the main mass extinction horizon, indicating the initial deterioration of oceanic environment. Fluctuation of the carbon isotope composition is obviously related with the episodic evolution of ostracod species, but not with the abundance of ostracods.
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DOI：
10.1669/0883-1351(2003)018
发表时间：
2003-06
期刊：
--
影响因子：
--
作者：
Sean R. Cornell;C. Brett;C. Sumrall
通讯作者：
Sean R. Cornell;C. Brett;C. Sumrall
DOI：
--
发表时间：
2004
期刊：
--
影响因子：
--
作者：
Yi Wu
通讯作者：
Yi Wu
DOI：
10.1073/pnas.0802597105
发表时间：
2008-08-12
影响因子：
11.1
作者：
Alroy, John
通讯作者：
Alroy, John
影响因子：
1.6
作者：
BURNE R V;MOORE L S
通讯作者：
MOORE L S
影响因子：
1.9
作者：
F. Lethiers;R. Whatley
通讯作者：
F. Lethiers;R. Whatley