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Organic matter preservation along a ...

Nuwer, Jonathan Mark.

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Organic matter preservation along a dynamic continental margin: Forms and fates of sedimentary organic matter.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Organic matter preservation along a dynamic continental margin: Forms and fates of sedimentary organic matter./
作者:	Nuwer, Jonathan Mark.
面頁冊數:	176 p.
附註:	Adviser: Richard G. Keil.
Contained By:	Dissertation Abstracts International69-02B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3303398
ISBN:	9780549496953

Organic matter preservation along a dynamic continental margin: Forms and fates of sedimentary organic matter.
Nuwer, Jonathan Mark.

Organic matter preservation along a dynamic continental margin: Forms and fates of sedimentary organic matter. - 176 p.

Adviser: Richard G. Keil.

Thesis (Ph.D.)--University of Washington, 2008.

Burial of organic carbon in marine sediments is a long-term sink in the global carbon cycle, effectively isolating this material from rapidly cycling carbon pools over geologic time scales. The mechanisms that control both the remineralization and preservation of sedimentary organic carbon remain elusive. This dissertation contributes to current understanding of sedimentary organic matter dynamics by helping to explain how, where, and why sedimentary organic matter degrades, is transported, and is ultimately preserved along the continental margin of Washington State and Vancouver Island, British Columbia. Fjord estuaries of Vancouver Island act as a microcosm for many continental margin processes. These protected basins are able efficiently trap the fine-grained lithogenic minerals and terrestrial organic matter normally dispersed across the margin after entering the marine environment. Interactions between organic matter and minerals are dynamic during lateral particle transport across the margin. Organic-mineral aggregates serve as both a long-term protection mechanism and a temporary conduit for the degradation and offshore transport of both marine and terrestrial organic matter. The heterogeneity of offshore geochemical transformations observed along the margin is likely due to regionally unique sources of organic and mineral components to the sediment. Although the observed degradation of organic matter in surface sediments may be enhanced by physical perturbations, aerobic degradation alone causes an orderly evolution of the biochemical composition.

ISBN: 9780549496953Subjects--Topical Terms:

545717
Biogeochemistry.

Organic matter preservation along a dynamic continental margin: Forms and fates of sedimentary organic matter.
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520 $a Burial of organic carbon in marine sediments is a long-term sink in the global carbon cycle, effectively isolating this material from rapidly cycling carbon pools over geologic time scales. The mechanisms that control both the remineralization and preservation of sedimentary organic carbon remain elusive. This dissertation contributes to current understanding of sedimentary organic matter dynamics by helping to explain how, where, and why sedimentary organic matter degrades, is transported, and is ultimately preserved along the continental margin of Washington State and Vancouver Island, British Columbia. Fjord estuaries of Vancouver Island act as a microcosm for many continental margin processes. These protected basins are able efficiently trap the fine-grained lithogenic minerals and terrestrial organic matter normally dispersed across the margin after entering the marine environment. Interactions between organic matter and minerals are dynamic during lateral particle transport across the margin. Organic-mineral aggregates serve as both a long-term protection mechanism and a temporary conduit for the degradation and offshore transport of both marine and terrestrial organic matter. The heterogeneity of offshore geochemical transformations observed along the margin is likely due to regionally unique sources of organic and mineral components to the sediment. Although the observed degradation of organic matter in surface sediments may be enhanced by physical perturbations, aerobic degradation alone causes an orderly evolution of the biochemical composition.
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