Journal ArticleDOI
Mesoproterozoic rifting and Pan-African continental collision in SE India: evidence from the Khariar alkaline complex
Dewashish Upadhyay,Dewashish Upadhyay,Michael M. Raith,Klaus Mezger,Abhijit Bhattacharya,Peter D. Kinny +5 more
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In this article, the suture zone between the Bhandara craton and the granulite-facies rocks of the Eastern Ghats Province in SE India contains a number of deformed alkaline and tholeiitic intrusives.Abstract:
The suture zone between the Bhandara craton and the granulite-facies rocks of the Eastern Ghats Province in SE India contains a number of deformed alkaline and tholeiitic intrusives. The Khariar alkaline complex is one of the several occurrences which intruded in the Mesoproterozoic (1,480±17 Ma, 2σ) and was deformed during the Pan-African tectonothermal event. The geochemical signatures indicate a rift-related setting for the magmatic activity. The nepheline syenite parent magma may have been produced by in-mantle fractionation of clinopyroxene and Ti-rich amphibole from a basanitic primary magma derived from an enriched spinel lherzolite mantle source in the sub-continental lithosphere. Geochemical variations in the Khariar alkaline suite can be modeled by the fractionation of clinopyroxene, amphibole, titanite, zircon, apatite and allanite. The Mesoproterozoic alkaline magmatism at Khariar marks the initiation of a NE-SW rift which formed several craton margin basins and opened an ocean towards the south. The sediments of the cratogenic basins and the Eastern Ghats Province were deposited in these rift-related basins. A K-Ar age of 1,330±53 Ma from glauconites in sandstone suggests that the NW-SE trending Godavari–Pranhita graben formed at approximately the same time as the rift at the craton margin. If the two are related, the Godavari–Pranhita graben may represent the failed arm of a rift system in which the NE-SW arm was the active segment. The granulite-facies deformation and metamorphism of the Eastern Ghats Province sediments may be related to an episode of Grenvillian basin inversion. The Mesoproterozoic rifting and Grenvillian basin closure may thus represent two well-defined parts of a Wilson cycle i.e. the opening and closure of an ocean. The Khariar and other alkaline bodies were, however, deformed during a Pan-African collisional event associated with the westward thrusting of the Eastern Ghats Province granulites over the cratonic foreland.read more
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Extraordinary transport and mixing of sediment across Himalayan central Gondwana during the Cambrian–Ordovician
Paul M. Myrow,Nigel C. Hughes,John W. Goodge,C. Mark Fanning,Ian S. Williams,Shanchi (彭善池) Peng,O N Bhargava,S. K. Parcha,Kevin R. Pogue +8 more
TL;DR: In this paper, detrital zircon samples from Cambrian and Lower to Middle Ordovician strata were taken across and along the strike of the Hima-laya from Pakistan to Bhutan (~2000 km).
Journal ArticleDOI
U–Th–Pb monazite geochronometry of the Eastern Ghats Belt, India: Timing and spatial disposition of poly-metamorphism
Ralf Simmat,Michael M. Raith +1 more
TL;DR: In this paper, the authors used the electron microprobe chemical dating technique to identify the timing and regional distribution of tectonothermal events within the Eastern Ghats belt of peninsular India.
Journal ArticleDOI
Integrated in situ zircon U–Pb age and Hf–O isotopes for the Helanshan khondalites in North China Craton: Juvenile crustal materials deposited in active or passive continental margin?
TL;DR: In this paper, an integrated analysis of U-Pb age and Hf-O isotopes for detrital zircons from the Helanshan Complex in the westernmost part of the Khondalite Belt was carried out.
Journal ArticleDOI
Mesoproterozoic ophiolitic mélange from the SE periphery of the Indian plate: U–Pb zircon ages and tectonic implications
TL;DR: In this article, laser ablation-ICP-MS age data and REE geochemistry of zircons from the gabbro and granite are reported. But the results are limited to the Kanigiri ophiolite components.
Journal ArticleDOI
Timing and dynamics of the juxtaposition of the Eastern Ghats Mobile Belt against the Bhandara Craton, India: A structural and zircon U-Pb SHRIMP study of the fold-thrust belt and associated nepheline syenite plutons
TL;DR: In this paper, sensitive High Resolution Ion MicroProbe (SHRIMP) U-Pb dating of zircon from basement granite gneisses and nepheline syenites of the Sinapalli Nappe, occurring along the northwestern margin of the Eastern Ghats Mobile Belt, indicate high grade regional metamorphism and associated folding accompanying juxtaposition of the nappe with the Bhandara Craton, to have taken place between 617 ± 85 Ma and 517 Ma (age of the youngest syenite).
References
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