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Chaudhri, Naveen
- Record of Post-Collisional A-Type Magmatism in the Alwar Complex, Northern Aravalli Orogen, NW India
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1 Centre of Advanced Study in Geology, Panjab University, Chandigarh-160 014, IN
1 Centre of Advanced Study in Geology, Panjab University, Chandigarh-160 014, IN
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Current Science, Vol 112, No 03 (2017), Pagination: 608-615Abstract
The Alwar complex is situated in the northern part of the Aravalli orogen, NW India and contains A-type granites of late Palaeoproterozoic age. The current study focusses on the Harsora and Dadikar plutons to characterize and constrain the tectonic setting of Palaeoproterozoic felsic A-type magmatism in this crustal segment using whole-rock geochemical data. The rocks studied are metaluminous to slightly peraluminous A-type ferroan granites. The granites are generally characterized by strongly fractionated LREE patterns with nearly flat HREE profiles and show moderate to strong negative Eu anomalies, in addition to prominent negative anomalies in Ba, Nb, Sr, P and Ti. The results show the post-collisional setting of A-type granites in the northern Aravalli orogen and signify that A-type granites may not only form in anorogenic setting. This study provides a new dimension to the understanding of palaeoproterozoic geodynamic evolution in the Aravalli orogen.Keywords
A-Type Granites, Post-Collision, Aravalli Orogen, Alwar Complex, Whole-Rock Geochemistry.Full Text
- First Record of Circa 970 Ma Post-Collisional A-Type Magmatism in the Sendra Granitoid Suite, Central Aravalli Orogen, Northwest India
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PDF Views:85
Authors
Affiliations
1 Centre of Advanced Study in Geology, Panjab University, Chandigarh 160 014, IN
1 Centre of Advanced Study in Geology, Panjab University, Chandigarh 160 014, IN
Source
Current Science, Vol 118, No 5 (2020), Pagination: 801-808Abstract
This study provides the first record for the emplacement of post-collisional A-type granites in extensional regime during the late Grenvillian period in northwest India. The ca. 970 Ma granites of the Sendra Granitoid Suite (Chang pluton) intrude calc-silicate rocks of the South Delhi Supergroup in the central Aravalli orogen. The Chang pluton is composed of granite sensu stricto; the granites are metaluminous, ferroan, calc-alkalic, and are characterized by high Ga/Al (>2.5), Nb + Y (>60 ppm), Ta + Yb (>6 ppm), REE, HFSE and zircon saturation temperatures, typical of A-type granites. The Y/Nb >1.2 further classified the rocks as A2-subtype, signifying their derivation from crustal sources in a post-collisional setting. The crustal source is also supported by their high LILE (Rb, K and Ba), and Pb, Th and REE. The geochronological data and tectonics of the region indicate that the granites were emplaced about 30 Myr after the Grenvillian collisional orogeny. This scenario likely resulted due to delamination of the lower part of the thickened orogenic lithosphere. These results are expected to have significant implications for the assembly tectonics of the Rodinia supercontinent.Keywords
A-Type Granites, Post-Collisional Extension, Whole-Rock Geochemistry, Magmatism.Full Text
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