globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12071
Scopus记录号: 2-s2.0-84890229081
论文题名:
Putative domal microbial structures in fluvial siliciclastic facies of the Mesoproterozoic (1.09 Ga) Copper Harbor Conglomerate, Upper Peninsula of Michigan, USA
作者: Wilmeth D.T.; Dornbos S.Q.; Isbell J.L.; Czaja A.D.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2014
卷: 12, 期:1
起始页码: 99
结束页码: 108
语种: 英语
Scopus关键词: adhesion ; alluvial fan ; carbonate ; copper ; facies ; freshwater ; harbor ; Raman spectroscopy ; sandstone ; sedimentary sequence ; Michigan ; Midcontinent Rift ; United States ; Upper Peninsula ; fresh water ; article ; microbiology ; sediment ; United States ; Fresh Water ; Geologic Sediments ; Michigan
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: The Copper Harbor Conglomerate is a Mesoproterozoic (1.09 Ga) freshwater sedimentary sequence that outcrops in the Upper Peninsula of Michigan. The formation was deposited during infilling of the failed Midcontinent Rift and contains fluvial, lacustrine, and alluvial fan facies. This study describes and analyzes the formation of small domal structures preserved in fluvial sandstone facies within the lower portion of the formation. These domal structures range from millimeters to several centimeters in diameter and height, and are preserved in convex epirelief on fine-grained sandstone beds. The structures have a pustulose texture and a patchy distribution on bedding planes. Slabs containing the structures were collected in the field and analyzed in the laboratory through inspection of cut slabs, petrographic thin sections, X-radiographs, and RAMAN spectroscopy. Results of these analyses reveal that the domal structures often contain weak, wavy horizontal bedding and laminae, and lack any vertical structures. These results support a biogenic origin of the domal structures instead of through abiogenic processes such as loading, sand volcanoes, or adhesion warts. These structures are akin to what were traditionally labeled as 'sand stromatolites', but are now known as 'domal sand structures'. Along with previous descriptions of carbonate stromatolites, organic-rich paleosols, and microbial sand structures, our findings provide further evidence that mat-forming microbial communities thrived in the late Mesoproterozoic freshwater systems of the Midcontinent Rift. © 2013 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85170
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Geosciences, University of Wisconsin-Milwaukee, Milwaukee, WI, United States; Geology Department, Milwaukee Public Museum, Milwaukee, WI, United States; Department of Geology, University of Cincinnati, Cincinnati, OH, United States; Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States

Recommended Citation:
Wilmeth D.T.,Dornbos S.Q.,Isbell J.L.,et al. Putative domal microbial structures in fluvial siliciclastic facies of the Mesoproterozoic (1.09 Ga) Copper Harbor Conglomerate, Upper Peninsula of Michigan, USA[J]. Geobiology,2014-01-01,12(1)
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