DOI: 10.1073/pnas.0504878102
论文题名: The paleoproterozoic snowball Earth: A climate disaster triggered by the evolution of oxygenic photosynthesis
作者: Kopp R.E. ; Kirschvink J.L. ; Hilburn I.A. ; Nash C.Z.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2005
卷: 102, 期: 32 起始页码: 11131
结束页码: 11136
语种: 英语
英文关键词: Cyanobacteria
; Huronian glaciations
; Makganyene glaciation
; Oxygen
Scopus关键词: carbonic acid
; cyanocobalamin
; gallium
; hopanoid
; iron
; lead
; manganese
; methane
; oxygen
; silicate
; snow
; squalene monooxygenase
; sterol 14alpha demethylase
; sulfate
; sulfur
; trace element
; Archaebacterium
; biogeochemical cycling
; biosphere
; Canada
; cholesterol synthesis
; climate
; Cyanobacterium
; Dinoflagellate
; evolution
; fossil
; Geobacter
; glacier
; greenhouse
; Huronian glaciation
; Makganyene glaciation
; methanotrophic bacterium
; Methylobacterium organophilum
; nonhuman
; oxidation reduction potential
; Paleoproterozoic
; Paleozoic
; photosynthesis
; photosystem II
; phototrophic bacterium
; Pongola glaciation
; priority journal
; review
; South Africa
; stratigraphy
; Carbon
; Climate
; Cyanobacteria
; Earth (Planet)
; Evolution
; Fossils
; Geology
; Ice Cover
; Iron
; Manganese
; Models, Biological
; Oxygen
; Phosphorus
; Photosynthesis
; Sulfur
; Time Factors
; Triterpenes
; Cyanobacteria
英文摘要: Although biomarker, trace element, and isotopic evidence have been used to claim that oxygenic photosynthesis evolved by 2.8 giga-annum before present (Ga) and perhaps as early as 3.7 Ga, a skeptical examination raises considerable doubt about the presence of oxygen producers at these times. Geological features suggestive of oxygen, such as red beds, lateritic paleosols, and the return of sedimentary sulfate deposits after a ≈900-million year hiatus, occur shortly before the ≈2.3-2.2 Ga Makganyene "snowball Earth" (global glaciation). The massive deposition of Mn, which has a high redox potential, practically requires the presence of environmental oxygen after the snowball. New age constraints from the Transvaal Supergroup of South Africa suggest that all three glaciations in the Huronian Supergroup of Canada predate the Snowball event. A simple cyanobacterial growth model incorporating the range of C, Fe, and P fluxes expected during a partial glaciation in an anoxic world with high-Fe oceans indicates that oxygenic photosynthesis could have destroyed a methane greenhouse and triggered a snowball event on timescales as short as 1 million years. As the geological evidence requiring oxygen does not appear during the Pongola glaciation at 2.9 Ga or during the Huronian glaciations, we argue that oxygenic cyanobacteria evolved and radiated shortly before the Makganyene snowball. © 2005 by The National Academy of Sciences of the USA. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162481
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Kopp, R.E., Division of Geological and Planetary Sciences, California Institute of Technology 170-25, Pasadena, CA 97725, United States; Kirschvink, J.L., Division of Geological and Planetary Sciences, California Institute of Technology 170-25, Pasadena, CA 97725, United States; Hilburn, I.A., Division of Geological and Planetary Sciences, California Institute of Technology 170-25, Pasadena, CA 97725, United States; Nash, C.Z., Division of Geological and Planetary Sciences, California Institute of Technology 170-25, Pasadena, CA 97725, United States
Recommended Citation:
Kopp R.E.,Kirschvink J.L.,Hilburn I.A.,et al. The paleoproterozoic snowball Earth: A climate disaster triggered by the evolution of oxygenic photosynthesis[J]. Proceedings of the National Academy of Sciences of the United States of America,2005-01-01,102(32)