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Global correlation of Cenomanian (upper Cretaceous) sequences: evidence for Milankovitch control on sea level
- Source :
- Geology. April, 2002, Vol. 30 Issue 4, p291, 4 p.
- Publication Year :
- 2002
-
Abstract
- We have investigated the sequence stratigraphy of two widely separated marine Cenomanian successions in southeast India and northwest Europe, and used high-resolution ammonite biostratigraphy to demonstrate that sea-level changes are globally synchronous and therefore must be eustatically controlled. Sequence-scale sea-level changes in the Cenomanian were driven by the long eccentricity cycle (400 k.y.) in the Milankovitch band. We hypothesize that, during pre-Quaternary time, the third-order sequences of Vail and Haq are essentially a sediment response to sea-level changes driven by the 400 k.y. cycle. Construction of a relative sea-level curve for the marginal marine succession in India demonstrates that the short-term sea-level changes are rapid (10-100 m/m.y.) and have a magnitude of 2-20 m. Glacioeustasy is a possible but unproven driving mechanism. Keywords: sequence stratigraphy, ammonite biostratigraphy, eustasy, Cenomanian (Cretaceous), Europe, India.
Details
- ISSN :
- 00917613
- Volume :
- 30
- Issue :
- 4
- Database :
- Gale General OneFile
- Journal :
- Geology
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.96501928