Biomarker evidence for photosynthesis during Neoproterozoic glaciation

被引：97

作者：

Olcott, AN ^{[1
]}

Sessions, AL

Corsetti, FA

Kaufman, AJ

de Oliviera, TF

机构：

[1] Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA

[2] CALTECH, Pasadena, CA 91125 USA

[3] Univ Maryland, College Pk, MD 20742 USA

来源：

SCIENCE | 2005年 / 310卷 / 5747期

关键词：

D O I：

10.1126/science.1115769

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Laterally extensive black shales were deposited on the Sao Francisco craton in southeastern Brazil during low-latitude Neoproterozoic glaciation similar to 740 to 700 million years ago. These rocks contain up to 3.0 weight % organic carbon, which we interpret as representing the preserved record of abundant marine primary productivity from glacial times. Extractable biomarkers reflect a complex and productive microbial ecosystem, including both phototrophic bacteria and eukaryotes, living in a stratified ocean with thin or absent sea ice, oxic surface waters, and euxinic conditions within the photic zone. Such an environment provides important constraints for parts of the "Snowball Earth" hypothesis.

引用

页码：471 / 474

页数：4

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