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Book Chapter

Early Diagenesis of Fatty Acids in Mangrove Peats, St. Croix, U.S. Virgin Islands

By
Robert Sassen
Robert Sassen
Department of Geological Sciences, Lehigh. University Bethlehem, Pennsylvania 18015
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Published:
January 01, 1977

Abstract

Samples of fresh leaves, stems, and seeds of the mangroves Rhizophora mangle, Avicennia nitida, and Laguncularia racemosa were analyzed in an attempt to evaluate their potential contribution of fatty acids to the associated peats. In plant tissues, the C18:3 C18:1andC18:2 fatty acids occur in higher percentages than the long-cnain fatty acias derived primarily from the mangrove waxes (n-C20:0 to n-C32:0) Some long-chain unsaturated and branched-chain fatty acids are also present in mangrove tissues. Comparison of fatty acid distributions of mangrove litter and peats with those of the living mangroves suggests that preferential preservation of the normal long–chain fatty acids occurs during early diagenesis. The relative abundances of short-chain saturated, and expecially unsaturated, fatty acids decrease, whereas the relative abundances of normal long-chain fatty acids increase.

Mangroves have been cited as possible progenitors of coals, but the relative stability of long-chain fatty acids in associated depositional environments may be significant also with respect to the gensis of high- wax petroleum.

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Contents

GSA Microform Publications

Interdisciplinary Studies of Peat and Coal Origins

P. H. Given
P. H. Given
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A. D. Cohen
A. D. Cohen
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Geological Society of America
Volume
7
ISBN electronic:
9780813759074
Publication date:
January 01, 1977

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