Research Article| January 01, 2003 Very high density CO2 associated with ultrahigh-temperature metamorphism in the Eastern Ghats granulite belt, India Sushmita Sarkar; Sushmita Sarkar 1Department of Geological Sciences, Jadavpur University, Kolkata-700 032, India Search for other works by this author on: GSW Google Scholar M. Santosh; M. Santosh 2Faculty of Science, Kochi University, Akebono-cho 2-5-1, Kochi 780-8520, Japan Search for other works by this author on: GSW Google Scholar Somnath Dasgupta; Somnath Dasgupta 3Department of Geological Sciences, Jadavpur University, Kolkata-700 032, India Search for other works by this author on: GSW Google Scholar M. Fukuoka M. Fukuoka 4Department of Earth and Planetary Sciences, Hiroshima University, Higashi-Hiroshima, Japan Search for other works by this author on: GSW Google Scholar Geology (2003) 31 (1): 51–54. https://doi.org/10.1130/0091-7613(2003)031<0051:VHDCAW>2.0.CO;2 Article history received: 30 May 2002 rev-recd: 19 Sep 2002 accepted: 22 Sep 2002 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Sushmita Sarkar, M. Santosh, Somnath Dasgupta, M. Fukuoka; Very high density CO2 associated with ultrahigh-temperature metamorphism in the Eastern Ghats granulite belt, India. Geology 2003;; 31 (1): 51–54. doi: https://doi.org/10.1130/0091-7613(2003)031<0051:VHDCAW>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Spinel-bearing high Mg-Al granulites of the Vizianagram area in the Eastern Ghats granulite belt show textural features clearly establishing that the association spinelss + quartz + Fe-Ti oxide solid solution ± sillimanite ± porphyroblastic orthopyroxene was stable during peak metamorphic conditions. Pressure-temperature (P-T) conditions estimated from both mineralogical thermobarometry and phase-equilibrium limitations indicate that the peak metamorphism occurred under ultrahigh-T conditions (>1000 °C) at 8–9 kbar pressure. Retrograde P-T conditions of 750–800 °C, 6–7 kbar are deduced from the compositions of coronal garnet and orthopyroxene, which have rims of spinel against quartz, indicating significant cooling with slight lowering of pressure. Quartz associated with the ultrahigh-T assemblage at Vizianagram contains ubiquitous single-phase carbonic inclusions as isolated clusters that belong to two categories. Group I shows extremely high density (homogenization temperature: −51 ± 1.8 °C; density 1.15 g/cm3) and group II trapped relatively lower density fluids (homogenization temperature: −18.4 ± 2.4 °C; density 1.05 g/cm3). The iso chores for group I inclusions pass through the peak metamorphic P-T conditions, whereas those for group II coincide with the P-T conditions of the formation of coronal garnet and orthopyroxene. Our study is the first report of very high density CO2 associated with the Eastern Ghats granulite belt rocks and provides a strong case for the presence of CO2-rich fluids during ultrahigh-T metamorphism at lower crustal levels. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.