Conference proceeding
On the spatial and temporal distribution of geochemically distinct lavas in the Deccan large igneous province
American Geophysical Union Fall Meeting, Vol.2018
Dec 2018
Abstract
The Deccan Traps was one of the first LIPs to be divided into geochemically defined and stratigraphically ordered lava sequences, in this case termed "sub-groups and formations". The resulting nomenclature, based on data from the geographically restricted Western Ghats (WG), has been applied with varied success to more distal portions of the Deccan Province (e.g., Rajahmundry, Mandla Lobe, Malwa Plateau, Gujarat, and Kutch). In the WG, it is increasingly well established that the various geochemically-defined formations are isochronous within geochronologic resolution, implying the operation of consistent and coeval petrogenetic processes, including a dramatic transition at the Cretaceous/Paleogene boundary (KPB), over this large region. Beyond the WG, there has been insufficient geochronological control to test whether volcanism underwent similar and synchronous evolution. Improved lava chronostratigraphy is critical to sequencing important paleontological occurrences that are concentrated on the fringes of the WG. It is clear that the distal regions reveal more complex chemical stratigraphy than in the WG, and that magmatism initiated earlier in the northern subprovinces. It remains unclear whether general trends in mantle melt composition persist with variable assimilation of heterogeneous lithosphere over a similar timespan, or magma evolution trends were similar but diachronous. At issue among other things is whether the state shift manifest in the WG at KPB time was province-wide, as might be expected if the Chicxulub impact was a driver of abrupt magma production and/or ascent on a regional scale. We address these questions using high-precision geochronology, major and trace element compositions, and Sr-Nd-Pb-Os isotope geochemistry.
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Details
- Title
- On the spatial and temporal distribution of geochemically distinct lavas in the Deccan large igneous province
- Creators
- Paul R. Renne - Berkeley Geochronology CenterS. A. Gibson - University of California at Berkeley USA United StatesA. Marzoli - University of CambridgeD. Mohabey - ITAK. Pande - Geological Survey of IndiaL. C. Reisberg - Indian Institute of Technology BombayB. Samant - Centre de Recherches Pétrographiques et GéochimiquesS. Self - Nagpur University IND IndiaC. J. Sprain - University of LiverpoolLoyc Vanderkluysen - Drexel UniversityM. Widdowson - University of HullAnonymous
- Publication Details
- American Geophysical Union Fall Meeting, Vol.2018
- Conference
- American Geophysical Union Fall Meeting (2018)
- Publisher
- American Geophysical Union
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES)
- Identifiers
- 991021015348004721