globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2017.04.005
论文题名:
Paleo-seawater REE compositions and microbial signatures preserved in laminae of Lower Triassic ooids
作者: Li F.; Yan J.; Burne R.V.; Chen Z.-Q.; Algeo T.J.; Zhang W.; Tian L.; Gan Y.; Liu K.; Xie S.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
语种: 英语
英文关键词: Early Triassic ; Nanpanjiang Basin ; REE+Y ; South China ; Trace elements
英文摘要: Signals indicative of paleo-seawater rare earth element (REE) composition and microbial activity were identified in marine ooids from the Lower Triassic of South China using in situ laser ablation-inductively coupled plasma-mass spectroscopy (LA-ICP-MS) together with petrographic and isotope geochemical techniques. Quantitative trace element profiles were generated across successive growth laminae in the cortices of selected ooids. The shale-normalized REE and yttrium (Y) data of these layers show 1) light rare earth element depletion (mean LaSN/YbSN =0.36±0.14), 2) positive La anomalies (mean (La/La*)SN =2.02±1.25), and 3) high ratios of Y/Ho (mean 53±12), which are similar to modern seawater compositions and Bahamian ooids. These findings imply that ooids in the study samples faithfully record Early Triassic paleo-seawater chemical signals such as REE+Y distributions. Petrographic observations revealed dark-colored layers with intense fluorescence containing structures that resemble microbial filaments or extracellular polymeric substances. These layers also possess more enriched REE compositions and higher concentrations of nutrient-like elements (e.g., Zn and Ba) than adjacent recrystallized light-colored laminae. Most ooid laminae contain negative Ce anomalies indicative of a well-oxygenated environment of formation, but some laminae have minimal negative anomalies suggesting the influence of suboxic porewater conditions. The present study provides a new perspective on the role of microbes in ooid genesis and on the utility of ooids as proxies for paleo-seawater chemistry. © 2016 Elsevier B.V.
Citation statistics:
被引频次[WOS]:55   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68167
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China; Key Laboratory of Carbonate Reservoir of CNPC, Department of Sedimentology and Hydrocarbon Accumulation, Southwest Petroleum University, Chengdu 610500, China; Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia; School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD 4072, Australia; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China; Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013, USA

Recommended Citation:
Li F.,Yan J.,Burne R.V.,et al. Paleo-seawater REE compositions and microbial signatures preserved in laminae of Lower Triassic ooids[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Li F.]'s Articles
[Yan J.]'s Articles
[Burne R.V.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Li F.]'s Articles
[Yan J.]'s Articles
[Burne R.V.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Li F.]‘s Articles
[Yan J.]‘s Articles
[Burne R.V.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.