Latitudinal selectivity of foraminifer extinctions during the late Guadalupian crisis
Latitudinal selectivity of foraminifer extinctions during the late Guadalupian crisis
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DOI：
10.1666/0094-8373-35.4.465
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
D. Bond;P. Wignall
中科院分区：
文献类型：
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作者：
D. Bond;P. Wignall
摘要根据75个瓜达卢皮期和62个洛平纪地区的文献，编制了全球中上二叠统有孔虫属数据库，分别划分为32个和19个可操作的地理单元。聚类分析显示，在东潘塔拉萨省消失后，洛平纪有5个不同的瓜达卢比亚省减少到4个。瓜达鲁比亚/洛平纪(G/L)界线上的灭绝幅度表明，在其余省份，低纬度地区的损失存在强烈的区域差异。与东部和北部特提斯省相比，中部和西部特提斯省在省级和全球一级的灭绝幅度明显较小。潘塔拉萨经历了地方性物种的高度灭绝，但全球灭绝幅度与中西部特提斯的记录相似。这种地区性的倾向性在有孔虫和非有孔虫中都可以看到，尽管有孔虫遭受的灭绝程度要高得多。在随后的洛平吉亚期辐射期间，区域选择性也持续存在，中西部特提斯省记录到的震级最大。因此，在洛平纪全球记录的35个新属中，有27个是在中特提斯和西特提斯记录的，而在潘塔拉萨和东特提斯和北特提斯分别记录了5个和12个属。峨眉山大火成岩省在特提斯省东部和北部喷发，可能是该地区高消光-低辐射体制的一个因素。退化(以及随之而来的浅海生境丧失)似乎也是一个重要因素。在那些遭受最大灭绝损失的地区，瓜达卢皮亚晚期发生了一次重大但短暂的回归。
Abstract A global database of middle–upper Permian foraminiferal genera has been compiled from the literature for 75 Guadalupian and 62 Lopingian localities, grouped into 32 and 19 operational geographical units respectively. Cluster analysis reveals that five distinct Guadalupian provinces were reduced to four in the Lopingian, following the disappearance of the Eastern Panthalassa Province. Extinction magnitudes across the Guadalupian/Lopingian (G/L) boundary reveal that, in the remaining provinces, there is a strong regional variation to the losses at low paleolatitudes. The Central and Western Tethys Province experienced a markedly lower extinction magnitude, at both provincial and global levels, than the Eastern and Northern Tethys Province. Panthalassa experienced a high extinction magnitude of endemics, but a global extinction magnitude similar to that recorded in Central and Western Tethys. This regional bias is seen in both the fusulinacean and non-fusulinacean foraminifera, although fusulinaceans suffered much higher magnitudes of extinction. The regional selectivity also persisted during the subsequent Lopingian radiations, with the Central and Western Tethys Province recording the greatest magnitudes. Thus, of 35 new genera recorded globally from the Lopingian, 27 of these are recorded in Central and Western Tethys, compared to five and 12 genera respectively in Panthalassa and in Eastern and Northern Tethys. The Emeishan large igneous province erupted within the Eastern and Northern Tethys Province and may have been a factor in the high extinction–low radiation regime of this region. Regression (and consequent shallow-marine habitat loss) also appears to have been a significant factor. A major, but brief, late Guadalupian regression is best seen in those areas that suffered the greatest extinction losses.