Large Meteorite Impacts and Planetary Evolution IV

First SHRIMP U-Pb and 40Ar/39Ar chronological results from impact melt breccia from the Paleoproterozoic Dhala impact structure, India
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Published:September 01, 2010
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Jayanta Kumar Pati, Fred Jourdan, Richard Austin Armstrong, Wolf Uwe Reimold, Kuldeep Prakash, 2010. "First SHRIMP U-Pb and 40Ar/39Ar chronological results from impact melt breccia from the Paleoproterozoic Dhala impact structure, India", Large Meteorite Impacts and Planetary Evolution IV, Roger L. Gibson, Wolf Uwe Reimold
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The ~11-km-wide Dhala impact structure, in north-central India, is located in Archean granitoids of the Bundelkhand craton and is partially exposed beneath Paleoproterozoic sediments belonging to the Vindhyan Supergroup, which place the age of the structure between ca. 2.5 Ga and ca. 1.7 Ga. Field mapping and extensive drill-core observations show that an originally coherent impact melt sheet up to 130 m thick was spread over more than 12 km2. Confirmation of the impact origin of the structure is based on the recognition of diagnostic shock metamorphic features in clasts in impact melt rock. In order to better...
- absolute age
- Ar/Ar
- Archean
- Asia
- breccia
- Bundelkhand
- Cambrian
- chronology
- dates
- hydrothermal alteration
- impact breccia
- impact craters
- impact features
- impact melts
- impactites
- India
- Indian Peninsula
- ion probe data
- mass spectra
- melts
- metamorphic rocks
- metamorphism
- metasomatism
- Neoarchean
- nesosilicates
- orthosilicates
- overgrowths
- overprinting
- Paleoproterozoic
- Paleozoic
- Precambrian
- Proterozoic
- Semri Series
- shock metamorphism
- SHRIMP data
- silicates
- spectra
- U/Pb
- upper Precambrian
- Vindhyan
- zircon
- zircon group
- Dhala Crater