KMS Nanjing Institute of Geology and Palaeonotology,CAS
Demise of Ediacaran dolomitic seas marks widespread biomineralization on the Siberian Platform | |
R.A. Wood1; A.Yu. Zhuravlev2; S.S. Sukhov3; M. Zhu (朱茂炎)4; F. Zhao (赵方臣)4 | |
2017-01 | |
发表期刊 | Geology |
ISSN | 0091-7613 |
卷号 | 45期号:1页码:27-30 |
摘要 | The trigger for biomineralization of metazoans in the terminal Ediacaran, ca. 550 Ma, has been suggested to be the rise of oxygenation or an increase in seawater Ca concentration, but geochemical and fossil data have not been fully integrated to demonstrate cause and effect. Here we combine the record of macrofossils with early marine carbonate cement distribution within a relative depth framework for terminal Ediacaran to Cambrian successions on the eastern Siberian Platform, Russia, to interrogate the evolution of seawater chemistry and biotic response. Prior to ca. 545 Ma, the presence of early marine ferroan dolomite cement suggests dominantly ferruginous anoxic "aragonite-dolomite seas", with a very shallow oxic chemocline that supported mainly soft-bodied macrobiota. After ca. 545 Ma, marine cements changed to aragonite and/or high-Mg calcite, and this coincides with the appearance of widespread aragonite and high-Mg calcite skeletal metazoans, suggesting a profound change in seawater chemistry to "aragonite seas" with a deeper chemocline. By early Cambrian Stage 3, the first marine low-Mg calcite cements appear, coincident with the first low-Mg calcite metazoan skeletons, suggesting a further shift to "calcite seas". We suggest that this evolution of seawater chemistry was caused by enhanced continental denudation that increased the input of Ca into oceans so progressively lowering Mg/Ca, which, combined with more widespread oxic conditions, facilitated the rise of skeletal animals and in turn influenced the evolution of skeletal mineralogy. |
DOI | 10.1130/g38367.1 |
收录类别 | SCI |
语种 | 英语 |
WOS研究方向 | Geology |
WOS类目 | Geology |
WOS记录号 | WOS:000396124000009 |
出版者 | GEOLOGICAL SOC AMER, INC |
文献类型 | 期刊论文 |
条目标识符 | http://ir.nigpas.ac.cn/handle/332004/12827 |
专题 | 中国科学院南京地质古生物研究所 其他 |
通讯作者 | R.A. Wood |
作者单位 | 1.Univ Edinburgh, Sch GeoSci, James Hutton Rd, Edinburgh EH9 3FE, Midlothian, Scotland; 2.Lomonosov Moscow State Univ, Fac Biol, Dept Biol Evolut, Leninskie Gory 1 12, Moscow 119234, Russia; 3.Siberian Sci Res Inst Geol Geophys & Mineral Reso, Krasny Prospekt 67, Novosibirsk 630091, Russia; 4.Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | R.A. Wood,A.Yu. Zhuravlev,S.S. Sukhov,et al. Demise of Ediacaran dolomitic seas marks widespread biomineralization on the Siberian Platform[J]. Geology,2017,45(1):27-30. |
APA | R.A. Wood,A.Yu. Zhuravlev,S.S. Sukhov,M. Zhu ,&F. Zhao .(2017).Demise of Ediacaran dolomitic seas marks widespread biomineralization on the Siberian Platform.Geology,45(1),27-30. |
MLA | R.A. Wood,et al."Demise of Ediacaran dolomitic seas marks widespread biomineralization on the Siberian Platform".Geology 45.1(2017):27-30. |
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