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Volumn 311, Issue 5766, 2006, Pages 1446-1449

Late precambrian oxygenation; inception of the clay mineral factory

Author keywords

[No Author keywords available]

Indexed keywords

CARBON; CLAY MINERALS; DEPOSITION; ORGANIC MINERALS; SEDIMENTS;

EID: 33644867554     PISSN: 00368075     EISSN: 10959203     Source Type: Journal    
DOI: 10.1126/science.1118929     Document Type: Article
Times cited : (249)

References (39)
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    • Princeton Univ. Press, Princeton, NJ
    • A. H. Knoll, Life on a Young Planet (Princeton Univ. Press, Princeton, NJ, 2003), p. 247.
    • (2003) Life on a Young Planet , pp. 247
    • Knoll, A.H.1
  • 19
    • 85011363757 scopus 로고
    • Developments in Sedimentology, Elsevier, New York
    • C. E. Weaver, Clays, Muds and Shales (Developments in Sedimentology, Elsevier, New York, 1989), p. 819.
    • (1989) Clays, Muds and Shales , pp. 819
    • Weaver, C.E.1
  • 23
    • 33644873057 scopus 로고    scopus 로고
    • note
    • The Schultz ratio is an uncalibrated, dimensionless number that specifically indicates the relative amount of total phyllosilicates versus quartz by using the x-ray peak intensities for the sum of all phyllosilicates (020 peak, 19.8° 2 Θ, Cu Ka radiation) and quartz (100 peak, 20.8° 2Θ) on random powder mounts. For a granite or clean sandstone, this number would be <0.2. For mudstones and pelitic metamorphics (clay shales, mudstones, slates, and mica schists), it typically is between 0.2 and 2.0. Sediment derived from fine grinding of granite to clay size does not change the Schultz ratio unless dissolution and reprecipitation as a clay mineral has occurred. It is an indicator of available clay minerals in the provenance area, both recycled, and newly formed by soil processes. Later clay diagenesis (such as illitization) does not change the Schultz ratio because it typically converts one phyllosilicate to another.
  • 28
  • 30
    • 0035839062 scopus 로고    scopus 로고
    • D. S. Heckman et al., Science 293, 1129 (2001).
    • (2001) Science , vol.293 , pp. 1129
    • Heckman, D.S.1
  • 39
    • 33644872171 scopus 로고    scopus 로고
    • note
    • We thank S. Jensen, T. Bristow, G. Jiang, J. Gehling, and M. Fuller for help in the field. This work was sponsored by NASA grant NWG04GJ42G and NSF-EAR grants 0223198 and 0345207.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.