amba dongar
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2021 ◽  
pp. 1-29
Author(s):  
Shrinivas G. Viladkar ◽  
Natalia V. Sorokhtina
Keyword(s):  

Geochemistry ◽  
2020 ◽  
Vol 80 (1) ◽  
pp. 125534 ◽  
Author(s):  
Tomáš Magna ◽  
Shrinivas Viladkar ◽  
Vladislav Rapprich ◽  
Ondřej Pour ◽  
Jens Hopp ◽  
...  
Keyword(s):  

2020 ◽  
Author(s):  
Vladislav Rapprich ◽  
Tomáš Magna ◽  
Shrinivas Viladkar ◽  
Ondřej Pour ◽  
Jens Hopp ◽  
...  

2019 ◽  
Vol 60 (6) ◽  
pp. 1119-1134 ◽  
Author(s):  
Jyoti Chandra ◽  
Debajyoti Paul ◽  
Andreas Stracke ◽  
François Chabaux ◽  
Mathieu Granet

Abstract There are disparate views about the origin of global rift- or plume-related carbonatites. The Amba Dongar carbonatite complex, Gujarat, India, which intruded into the basalts of the Deccan Large Igneous Province (LIP), is a typical example. On the basis of new comprehensive major and trace element and Sr–Nd–Pb isotope data, we propose that low-degree primary carbonated melts from off-center of the Deccan–Réunion mantle plume migrate upwards and metasomatize part of the subcontinental lithospheric mantle (SCLM). Low-degree partial melting (∼2%) of this metasomatized SCLM source generates a parental carbonated silicate magma, which becomes contaminated with the local Archean basement during its ascent. Calcite globules in a nephelinite from Amba Dongar provide evidence that the carbonatites originated by liquid immiscibility from a parental carbonated silicate magma. Liquid immiscibility at crustal depths produces two chemically distinct, but isotopically similar magmas: the carbonatites (20% by volume) and nephelinites (80% by volume). Owing to their low heat capacity, the carbonatite melts solidified as thin carbonate veins at crustal depths. Secondary melting of these carbonate-rich veins during subsequent rifting generated the carbonatites and ferrocarbonatites now exposed at Amba Dongar. Carbonatites, if formed by liquid immiscibility from carbonated silicate magmas, can inherit a wide range of isotopic signatures that result from crustal contamination of their parental carbonated silicate magmas. In rift or plume-related settings, they can, therefore, display a much larger range of isotope signatures than their original asthenosphere or mantle plume source.


2018 ◽  
Vol 54 (6) ◽  
pp. 3438-3454 ◽  
Author(s):  
Benjamin R. Fosu ◽  
Prosenjit Ghosh ◽  
David M. Chew ◽  
Shrinivas G. Viladkar
Keyword(s):  

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