Zircon U-Pb ages and Hf isotopic systematics of charnockite gneisses from the Ediacaran–Cambrian high-grade metamorphic terranes, southern India: Constraints on crust formation, recycling, and Gondwana correlations

2016 ◽  
Vol 129 (5-6) ◽  
pp. 625-648 ◽  
Author(s):  
T. Vijaya Kumar ◽  
Y.J. Bhaskar Rao ◽  
Diana Plavsa ◽  
Alan S. Collins ◽  
J.K. Tomson ◽  
...  
Keyword(s):  
Southern India ◽  
High Grade ◽  
Crust Formation ◽  
Metamorphic Terranes

Sr, Nd, and Pb Isotopic Systematics in the Archean Low- to High-Grade Transition Zone of Southern India: Syn-Accretion vs. Post-Accretion Granulites

1989 ◽  
Vol 97 (5) ◽  
pp. 537-549 ◽  
Author(s):  
J. J. Peucat ◽  
P. Vidal ◽  
J. Bernard-Griffiths ◽  
K. C. Condie
Keyword(s):  
Transition Zone ◽  
Southern India ◽  
High Grade ◽  
Grade Transition

Geochemistry of bimodal amphibolitic—felsic gneiss complexes from eastern Massif Central, France

1995 ◽  
Vol 132 (3) ◽  
pp. 321-337 ◽  
Author(s):  
Bernard Briand ◽  
Jean-Luc Bouchardon ◽  
Houssa Ouali ◽  
Michel Piboule ◽  
Paul Capiez
Keyword(s):  
Crustal Contamination ◽  
Igneous Rocks ◽  
Chemical Characteristics ◽  
Continental Margins ◽  
High Grade ◽  
Transitional Stage ◽  
Crust Formation ◽  
Massif Central ◽  
Mantle Sources ◽  
Two Populations

AbstractHigh-grade basic and acidic meta-igneous rocks are widespread in the bimodal amphibolitic—felsic gneiss complexes, which are characteristic formations of the ‘Middle Allochthonous Unit’ from eastern and southern French Massif Central. The metabasites from the Lyonnais and Doux complexes are chemically diverse and range from N-MORB type tholeiitic to transitional types. The two populations are not related by fractional crystallization or crustal contamination processes and their chemical characteristics reflect differences in their mantle sources. An ensialic setting is supported by the crustally-derived character of some of the associated felsic rocks, but the presence of N-MORB-type metabasites argues for an extensional environment. This bimodal association compares well with the magmatism of rifted continental margins and may reflect a transitional stage between continental rifting and oceanic crust formation during the Cambro-Ordovician spreading event.

Origin of granites in an Archean high-grade terrane, southern India

1986 ◽  
Vol 92 (1) ◽  
pp. 93-103 ◽  
Author(s):  
K. C. Condie ◽  
G. P. Bowling ◽  
P. Allen
Keyword(s):  
Southern India ◽  
High Grade
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