| Abstract: | This fraction, which is enriched in heavy minerals relative to the sand fraction, is mainly detrital but contains a strong authigenic component. The authigenic silt heavy-mineral fraction is largely a product of the lateritic weathering and dominated by iron oxides and alterites. Grains of bladed rutile and leached ilmenite are common. Spatial variability in silt-fraction mineralogy is considerable. Within the Rio Cibuco system variability is related to compositional differences in rapidly eroding source rocks. On the shelf, silt heavy-mineral abundances are greatest at the river mouths and decrease seaward. Variability in the shelf samples is controlled primarily by source rivers and shelf sorting processes. -from Authors |
| Genre: | Article |
| ProdID: | 70019612 |
| Citation Author: | Poppe, L. J.; Commeau, J. A.; Luepke, G. |
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| Citation End Page: | 268 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Sedimentary Geology |
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| Citation Number Of Pages: | 18 |
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| Citation Search Results Text: | Silt fraction heavy-mineral distributions in a lateritic environment: the rivers and insular shelf of north-central Puerto Rico; 1995; Article; Journal; Sedimentary Geology; Poppe, L. J.; Commeau, J. A.; Luepke, G. |
| Citation Start Page: | 251 |
| Citation Volume: | 95 |
| Citation Year: | 1995 |
| Type: | citation/reference |
| Text: | Silt fraction heavy-mineral distributions in a lateritic environment: the rivers and insular shelf of north-central Puerto Rico; 1995; Article; Journal; Sedimentary Geology; Poppe, L. J.; Commeau, J. A.; Luepke, G. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1995 00:00 -0600 |
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