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Sedimentology, paleontology, and sta...

Packer, Bonnie Marcia.

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Sedimentology, paleontology, and stable isotope geochemistry of selected formations in the 2.7-billion-year-old Fortescue Group, western Australia.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Sedimentology, paleontology, and stable isotope geochemistry of selected formations in the 2.7-billion-year-old Fortescue Group, western Australia./
作者:	Packer, Bonnie Marcia.
面頁冊數:	206 p.
附註:	Source: Dissertation Abstracts International, Volume: 51-07, Section: B, page: 3292.
Contained By:	Dissertation Abstracts International51-07B.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9034005

Sedimentology, paleontology, and stable isotope geochemistry of selected formations in the 2.7-billion-year-old Fortescue Group, western Australia.
Packer, Bonnie Marcia.

Sedimentology, paleontology, and stable isotope geochemistry of selected formations in the 2.7-billion-year-old Fortescue Group, western Australia. - 206 p.

Source: Dissertation Abstracts International, Volume: 51-07, Section: B, page: 3292.

Thesis (Ph.D.)--University of California, Los Angeles, 1990.

The environment of deposition for the Meentheena Carbonate Member of the Tumbiana Formation was sub- to supralittoral, based on the association of sedimentary structures.Subjects--Topical Terms:

516570
Geology.

Sedimentology, paleontology, and stable isotope geochemistry of selected formations in the 2.7-billion-year-old Fortescue Group, western Australia.
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100 1 $a Packer, Bonnie Marcia. $3 1904959
245 1 0 $a Sedimentology, paleontology, and stable isotope geochemistry of selected formations in the 2.7-billion-year-old Fortescue Group, western Australia.
300 $a 206 p.
500 $a Source: Dissertation Abstracts International, Volume: 51-07, Section: B, page: 3292.
500 $a Chair: Raymond V. Ingersoll.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 1990.
520 $a The environment of deposition for the Meentheena Carbonate Member of the Tumbiana Formation was sub- to supralittoral, based on the association of sedimentary structures.
520 $a Sedimentary structures and detrital content indicate that chert from the lowermost Jerrinah Formation (Woodiana Sandstone Member) was formed by silica replacement of clastic and carbonate rocks. Ladder ripples and probable pseudomorphs after gypsum suggest a shallow-water paleoenvironment. These cherts have five subfacies, which are laterally discontinuous and brecciated to various degrees. Lateral variation in lithology is due to: sediment deposition in shallow water, undulating surface topography of underlying basalt, and limited areal extent of silica replacement. Brecciation of these rocks may have been the result of silica replacement (which may have been hydrothermal) and/or tectonic deformation.
520 $a Based on the description of six distinct stromatolite types (A-F) from the Meentheena Carbonate and the Woodiana Sandstone, a diverse assemblage of microorganisms was extant 2.7 Ga, although their affinities remain uncertain.
520 $a Stable isotopes from the Meentheena Carbonate, Woodiana Sandstone chert, and Jerrinah Formation shales reflect biological, post-depositional, and sedimentological influences. Kerogen values ( $\ delta\sp{13} $\ sb{\rm PDB} $) range between $- $3 9.16 and $- $5 9.38 and average $- $4 7.11 per mil.. These light values are primary, and support the theory that methanotrophs may have been part of the Archean biosphere. Variations in kerogen $\ delta\sp{13} $\ delta\sp{13} $\ sb{\rm PDB} $ values for the Meentheena Carbonate average 0.03 with a standard deviation of 1.22; they show no biological influence. Values either represent primary marine values or a secondary homogenization by a large reservoir of water.
520 $a Sulfur-isotope values ( $\ delta\sp{34} $- $0 .54 per mil., with a standard deviation of 1.83, supporting post-2.7 Ga emergence for dissimilatory sulfate reduction.
590 $a School code: 0031.
650 4 $a Geology. $3 516570
650 4 $a Paleontology. $3 518862
650 4 $a Geochemistry. $3 539092
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690 $a 0418
690 $a 0996
710 2 0 $a University of California, Los Angeles. $3 626622
773 0 $t Dissertation Abstracts International $g 51-07B.
790 1 0 $a Ingersoll, Raymond V., $e advisor
790 $a 0031
791 $a Ph.D.
792 $a 1990
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