dC Variations in Late Jurassic Carbonates, Jaisalmer Formation, Western India
2003; Elsevier BV; Volume: 6; Issue: 4 Linguagem: Inglês
10.1016/s1342-937x(05)71038-8
ISSN1878-0571
Autores Tópico(s)Groundwater and Isotope Geochemistry
ResumoThe carbon isotope measurements, carried out on subsurface carbonate samples from Oxfordian Jaisalmer Formation, western India, yield positive d13C values up to +3.17%. The most positive Oxfordian C-isotope value corresponds to the carbon isotope excursion measured in samples from from other late Jurassic basins of world. The latest Oxfordian C-isotope values of Jaisalmer Basin fluctuate around 2% while the C-isotope values of 1.50% mark the base of Kimmeridgian. The Oxfordian C-isotope excursion appears to correspond to a time of overall increased organic carbon burial triggered by increased nutrient transfer from continents to oceans during a time of rising global sea level.
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