Formation of the Shelf-edge Cretaceous-Tertiary contact off the southeastern U.S. Coast
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Abstract
Submarine erosion, associated with changes in position of the proto-Gulf Stream, was the dominant mechanism controlling the formation of the Cretaceous-Tertiary unconformity in AMCOR borehole 6004. Paleontologic evidence indicates that this unconformity, which is marked by a gravelly-sand enriched in glauconitic and phosphoritic concretions, represents a hiatus of about 7 m.y. Both Cretaceous and Paleocene sediments contain middle-outer neritic foraminiferal assemblages that become more diverse with distance from the contact. Of the elemental abundances measured, Al, Ba, Co, Fe, Ga, K, Mg/Ca, Mo, Ni, P, Sr/Ca, V, Y, and Zn show a strong positive correlation with proximity to the contact, probably as a result of the concentration of authigenic and heavy minerals present as lag sediments on the erosion surface.
Suggested Citation
Poppe, L., Hathaway, J., Hall, R., Commeau, R., 1986, Formation of the Shelf-edge Cretaceous-Tertiary contact off the southeastern U.S. Coast: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 57, no. 2-4, p. 117-135, https://doi.org/10.1016/0031-0182(86)90010-6.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Formation of the Shelf-edge Cretaceous-Tertiary contact off the southeastern U.S. Coast |
| Series title | Palaeogeography, Palaeoclimatology, Palaeoecology |
| DOI | 10.1016/0031-0182(86)90010-6 |
| Volume | 57 |
| Issue | 2-4 |
| Year Published | 1986 |
| Language | English |
| Publisher | Elsevier |
| Description | 19 p. |
| First page | 117 |
| Last page | 135 |
| Country | United States |
| State | Florida, Georgia, South Carolina |