Black shale deposition and faunal overturn in the Devonian Appalachian basin: Clastic starvation, seasonal water-column mixing, and efficient biolimiting nutrient recycling

被引:357
作者
Murphy, AE [1 ]
Sageman, BB
Hollander, DJ
Lyons, TW
Brett, CE
机构
[1] Northwestern Univ, Dept Geol Sci, Evanston, IL 60208 USA
[2] Univ Missouri, Dept Geol Sci, Columbia, MO 65211 USA
[3] Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA
来源
PALEOCEANOGRAPHY | 2000年 / 15卷 / 03期
关键词
D O I
10.1029/1999PA000445
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Integrated geochemical data suggest that black shale deposition in the Devonian Genesco Formation of western New York was initiated by the coincidence of siliciclastic starvation and the intensification of seasonal water column stratification and mixing. Once established, however, black shale deposition was maintained through efficient recycling of biolimiting nutrients which enhanced primary productivity. Recycling efficiency was achieved through a positive feedback loop of oscillating benthic redox conditions that enhanced N and P regeneration from sediments, sustained high primary productivity by returning nutrients to the photic zone during mixing, and ensured a downward flux of organic matter that drove or enhanced the episodic development of benthic anoxia during stratification. This feedback was ultimately disrupted by rising siliciclastic influx, which diluted organic matter and restored benthic redox stability. The abrupt overturn of diverse, long-standing Appalachian basin marine communities may have been the result of trophic resource destabilization during Geneseo deposition.
引用
收藏
页码:280 / 291
页数:12
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