DOI: 10.1002/2015GB005241
Scopus记录号: 2-s2.0-84960441996
论文题名: The long-term impact of magnesium in seawater on foraminiferal mineralogy: Mechanism and consequences
作者: Van Dijk I ; , De Nooijer L ; J ; , Hart M ; B ; , Reichart G ; -J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 3 起始页码: 438
结束页码: 446
语种: 英语
英文关键词: foraminifera
; foraminiferal evolution
; seawater Mg/Ca
Scopus关键词: abundance
; aragonite
; calcite
; calcium
; calcium carbonate
; community dynamics
; dominance
; environmental conditions
; extinction
; foraminifera
; fossil record
; magnesium
; mineralogy
; paleoecology
; Phanerozoic
; protist
; seawater
; Foraminifera
; Protista
英文摘要: Foraminifera are unicellular protists, primarily known for their calcium carbonate shells that provide an extensive fossil record. This record, ranging from Cambrian to present shows both major shifts and gradual changes in the relative occurrence of taxa producing different polymorphs of carbonate. Here we present evidence for coupling between shifts in calcite- versus aragonite-producing species and periods with, respectively, low and high seawater Mg/Ca throughout the Phanerozoic. During periods when seawater Mg/Ca is <2 mol/mol, low-Mg calcite-producing species dominate the foraminiferal community. Vice versa, high-Mg calcite- and aragonite-producing species are more abundant during periods with relatively high seawater Mg/Ca. This alteration in dominance of the phase precipitated is due to selective recovery of groups producing the favorable polymorph after shifts from calcite to aragonite seas. In addition, relatively high extinction rates of species producing the mineral phase not favored by the seawater Mg/Ca of that time may be responsible for this alteration. These results imply that the current high seawater Mg/Ca will, in the long term, favor prevalence of high-Mg and aragonite-producing foraminifera over calcite-producing taxa, possibly shifting the balance toward a community in which calcite production is less dominant. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77866
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Ocean Systems, NIOZ-Royal Netherlands Institute for Sea Research and Utrecht University, Den Burg, Netherlands; School of Geography, Earth and Environmental Sciences, Plymouth University, Plymouth, United Kingdom; Faculty of Geosciences, Earth Sciences Department, Utrecht University, Utrecht, Netherlands
Recommended Citation:
Van Dijk I,, De Nooijer L,J,et al. The long-term impact of magnesium in seawater on foraminiferal mineralogy: Mechanism and consequences[J]. Global Biogeochemical Cycles,2016-01-01,30(3)