Silt fraction heavy-mineral distributions in a lateritic environment: The rivers and insular shelf of north-central Puerto Rico
Sedimentary Geology
By: L.J. Poppe, J.A. Commeau, and G. Luepke
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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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Silt fraction heavy-mineral distributions in a lateritic environment: The rivers and insular shelf of north-central Puerto Rico |
| Series title | Sedimentary Geology |
| DOI | 10.1016/0037-0738(94)00114-A |
| Volume | 95 |
| Issue | 3-4 |
| Year Published | 1995 |
| Language | English |
| Contributing office(s) | Woods Hole Coastal and Marine Science Center |
| Description | 18 p. |
| Larger Work Title | Sedimentary Geology |
| First page | 251 |
| Last page | 268 |
| Country | United States |
| State | Puerto Rico |