DOI: 10.1016/j.palaeo.2014.06.014
论文题名: Geographically different oceanographic responses to global warming during the Cenomanian-Turonian interval and Oceanic Anoxic Event 2
作者: Thomas D.J. ; Tilghman D.S.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 411 起始页码: 136
结束页码: 143
语种: 英语
英文关键词: Cretaceous
; Nd isotopes
; Ocean drilling
; Oceanic Anoxic Events
英文摘要: Oceanic Anoxic Event (OAE) 2 coincided with the Cenomanian-Turonian boundary ~ 93.9 Ma, and was one of the two most prominent and globally significant of the major mid-Cretaceous OAEs. A confluence of global warming, major large igneous province volcanism, and intensified hydrologic cycling preconditioned the earth system for widespread preservation of organic matter during OAE2; however the ultimate necessary ingredient was enhanced nutrient availability in oceanic surface waters. Here we present new Cenomanian-Turonian interval seawater Neodymium isotope data from the proto-Indian Ocean that demonstrates increased water column stratification during the pre- and post-OAE2 interval, punctuated by a transient decrease in this stratification immediately prior to the onset of OAE2 recorded at Ocean Drilling Program Site 763. The direct oceanographic responses to climate change on both longer- and short-term time scales observed in this region are distinct from those recorded in the northern, tropical and southern Atlantic basins. The transient de-stratification of the water column in the eastern proto-Indian Ocean likely did not contribute to the accumulation of organic-rich sediments in the region, indicating that weathering and/or hydrothermal inputs promoted enhanced surface water nutrient levels and hence primary productivity. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69238
Appears in Collections: 过去全球变化的重建
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作者单位: Texas A and M University, Department of Oceanography, United States; Texas A and M University, Department of Geology and Geophysics, United States
Recommended Citation:
Thomas D.J.,Tilghman D.S.. Geographically different oceanographic responses to global warming during the Cenomanian-Turonian interval and Oceanic Anoxic Event 2[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,411