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.
| 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 |
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