Conference proceeding
Early Deccan Traps CO (sub 2) budget & degassing history constrained from melt inclusions
American Geophysical Union Fall Meeting, Vol.2018
Dec 2018
Abstract
The climatic significance of CO (sub 2) release from flood basalt magmas remains controversial, in part because the CO (sub 2) budget of these magmas is poorly constrained. A warming episode that preceded the K-Pg mass extinction has been linked with emplacement of the opening phases of the Deccan Traps. Here, we measure CO (sub 2) concentrations in glassy, bubble-bearing melt inclusions from early picritic lavas to assess the CO (sub 2) budget of early Deccan magmatism and their expected climatic consequences. These melt inclusions are hosted in high-Fo (Fo>85) olivines from two lavas recovered from the Botad drill core of Gujarat (NW Deccan), which is interpreted as among the earliest products of Deccan volcanism. Glassy inclusions trapped in picrite basalts represent the best option for understanding primitive mantle characteristics in flood basalt provinces because these magmas have experienced the least amount of crustal processing before eruption. We report initial CO (sub 2) concentrations from secondary ion mass spectrometry and Raman spectroscopy on vapor bubbles. Because these measurements reflect only dissolved CO (sub 2) at the time of melt inclusion entrapment, they represent a minimum CO (sub 2) estimate. We compare these results with CO (sub 2) contents estimated from trace element ratios to infer the deep degassing history of these magmas.
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Details
- Title
- Early Deccan Traps CO (sub 2) budget & degassing history constrained from melt inclusions
- Creators
- Andres Hernandez Nava - City University of New York Graduate Center New York, NY USA United StatesB. A. Black - University of California, BerkeleyS. A. Gibson - University of CambridgeR. J. Bodnar - Virginia TechP. R. Renne - Berkeley Geochronology CenterL. Vanderkluysen - Arizona State UniversityAnonymous
- 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
- 991021015345804721