DOI: 10.1038/ngeo2632
论文题名: Snowball Earth ocean chemistry driven by extensive ridge volcanism during Rodinia breakup
作者: Gernon T.M. ; Hincks T.K. ; Tyrrell T. ; Rohling E.J. ; Palmer M.R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 3 起始页码: 242
结束页码: 248
语种: 英语
Scopus关键词: continental breakup
; deglaciation
; hyaloclastite
; oxygen
; Proterozoic
; Rodinia
; submarine volcano
; volcanism
; water chemistry
英文摘要: During Neoproterozoic Snowball Earth glaciations, the oceans gained massive amounts of alkalinity, culminating in the deposition of massive cap carbonates on deglaciation. Changes in terrestrial runoff associated with both breakup of the Rodinia supercontinent and deglaciation can explain some, but not all of the requisite changes in ocean chemistry. Submarine volcanism along shallow ridges formed during supercontinent breakup results in the formation of large volumes of glassy hyaloclastite, which readily alters to palagonite. Here we estimate fluxes of calcium, magnesium, phosphorus, silica and bicarbonate associated with these shallow-ridge processes, and argue that extensive submarine volcanism during the breakup of Rodinia made an important contribution to changes in ocean chemistry during Snowball Earth glaciations. We use Monte Carlo simulations to show that widespread hyaloclastite alteration under near-global sea-ice cover could lead to Ca2+ and Mg2+ supersaturation over the course of the glaciation that is sufficient to explain the volume of cap carbonates deposited. Furthermore, our conservative estimates of phosphorus release are sufficient to explain the observed P:Fe ratios in sedimentary iron formations from this time. This large phosphorus release may have fuelled primary productivity, which in turn would have contributed to atmospheric O2 rises that followed Snowball Earth episodes. © 2016 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106063
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: Ocean and Earth Science, University of Southampton, European Way, Southampton, United Kingdom; School of Earth Sciences, University of Bristol, Bristol, United Kingdom; Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia
Recommended Citation:
Gernon T.M.,Hincks T.K.,Tyrrell T.,et al. Snowball Earth ocean chemistry driven by extensive ridge volcanism during Rodinia breakup[J]. Nature Geoscience,2016-01-01,9(3)