DOI: 10.1038/NGEO3028
论文题名: A molybdenum-isotope perspective on Phanerozoic deoxygenation events
作者: Dickson A.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 10 起始页码: 721
结束页码: 726
语种: 英语
Scopus关键词: climate modeling
; Eocene
; isotopic composition
; marine environment
; marine sediment
; molybdenum
; Phanerozoic
; redox conditions
; sediment chemistry
英文摘要: The expansion and contraction of sulfidic depositional conditions in the oceans can be tracked with the isotopic composition of molybdenum in marine sediments. However, molybdenum-isotope data are often subject to multiple conflicting interpretations. Here I present a compilation of molybdenum-isotope data from three time intervals: the Toarcian Oceanic Anoxic Event about 183 million years ago, Oceanic Anoxic Event 2 about 94 million years ago, and two early Eocene hyperthermal events from 56 to 54 million years ago. A comparison of data from sites located in different hydrographic settings tightly constrains the molybdenum cycle for these intervals, allowing a direct comparison of the expanse of sulfidic conditions in each interval compared to today. Nonetheless, tracing rates of redox change over such rapid climatic events using molybdenum isotopes remains challenging. Future efforts to achieve this goal might be accomplished by analysing specific mineral phases, using complementary redox-sensitive geochemical techniques and by linking isotopic observations with Earth system modelling. Such improvements will make it possible to more fully assess the links between ocean deoxygenation, climatic and oceanographic changes, and biotic turnover. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105695
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, United Kingdom; Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey, United Kingdom
Recommended Citation:
Dickson A.J.. A molybdenum-isotope perspective on Phanerozoic deoxygenation events[J]. Nature Geoscience,2017-01-01,10(10)