| Abstract: | An analysis of the abundances and distributions of silt-sized heavy minerals from the U.S. mid-Atlantic outer continental shelf, slope, and rise shows that heavy minerals constitute a substantially greater weight percent of the silt fraction than that of the sand fraction regardless of environment and sediment texture. Concentrations of silt-sized heavy minerals progressively decrease from the shelf where they average 6.94%, to the slope and rise where they average 4.45% and 3.45%, respectively. A mixed amphibole-garnet+staurolite-epidote-pyroxene association dominates the silt-sized heavy mineral assemblage on the slope and rise; an ilmenite-amphibole-epidote association predominates on the shelf. Downslope trends in detrital nonmicaceous silt-sized heavy mineral abundances are related to hydraulic sorting rather than to chemical weathering. Elevated concentrations of the authigenic pyrite, siderite, dolomite+ankerite, and, possibly, phosphorite in the surficial slope sediment suggests that formation of silt-sized heavy minerals by diagenetic processes is relatively more important there than on the continental shelf or rise. ?? 1992. |
| Genre: | Article |
| ProdID: | 70016565 |
| Citation Author: | Poppe, L. J.; Commeau, J. A. |
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| Citation End Page: | 197 |
| Citation Issue: | 1-3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Marine Geology |
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| Citation Number Of Pages: | 13 |
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| Citation Search Results Text: | Mineralogy of the silt fraction in surficial sediments from the United States mid-Atlantic shelf, slope and rise; 1992; Article; Journal; Marine Geology; Poppe, L. J.; Commeau, J. A. |
| Citation Start Page: | 185 |
| Citation Volume: | 103 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | Mineralogy of the silt fraction in surficial sediments from the United States mid-Atlantic shelf, slope and rise; 1992; Article; Journal; Marine Geology; Poppe, L. J.; Commeau, J. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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