Conference proceeding
Spatial-temporal trends in deccan volcanism
American Geophysical Union Fall Meeting, Vol.2019
Dec 2019
Abstract
The eruptive history of terrestrial tholeiitic lavas of the Deccan Traps (DT) of India has been under scrutiny due to its overlap with the Cretaceous - Paleogene boundary (KPB) mass extinction event. Spatial limitation in the availability of precisely dated flows has made any overarching statements regarding the progression of eruptions ambiguous. Abundant pre-KPB lavas from Saurashtra, the Malwa Plateau, and the Mandla Lobe stand in contrast to what is currently known within the Western Ghats (WG). We report here on the status of a comprehensive (super 40) Ar/ (super 39) Ar dating program based on plagioclase separated from lavas. Our results thus far generally support the notion of a northward migration of the Indian subcontinent over the Reunion hotspot and imply the DT were active much earlier than has often been assumed based on results from the WG. It is becoming clear that the geochemical stratigraphy established for the WG cannot be straightforwardly extended to the more distal subprovinces. Also clear is that significant volumes of magma were erupted north of the WG prior to 66.4 Ma, when a global climate warming event recorded in benthic foraminifera (e.g., Barnet et al., 2017) began. Accordingly, models associating the onset of the warming event with inception of the DT volcanism are overly simplistic and need to be modified based on these findings.
Metrics
9 Record Views
Details
- Title
- Spatial-temporal trends in deccan volcanism
- Creators
- Andrew Tholt - University of California, BerkeleyPaul R. RenneKanchan PandeStephen SelfCourtney SprainLoyc VanderkluysenAnonymous
- Publication Details
- American Geophysical Union Fall Meeting, Vol.2019
- Conference
- American Geophysical Union Fall Meeting (2019)
- Publisher
- American Geophysical Union
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES)
- Identifiers
- 991021015347304721