Silt fraction heavy-mineral distributions in a lateritic environment: The rivers and insular shelf of north-central Puerto Rico
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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.
Suggested Citation
Poppe, L., Commeau, J., Luepke, G., 1995, Silt fraction heavy-mineral distributions in a lateritic environment: The rivers and insular shelf of north-central Puerto Rico: Sedimentary Geology, v. 95, no. 3-4, p. 251-268, https://doi.org/10.1016/0037-0738(94)00114-A.
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 |