scholarly journals Three‐dimensional vorticity and time‐constrained evolution of the Main Central Thrust zone, Garhwal Himalaya (NW India)

Terra Nova ◽  
2020 ◽  
Vol 32 (3) ◽  
pp. 215-224 ◽  
Author(s):  
Chiara Montemagni ◽  
Rodolfo Carosi ◽  
Nicoletta Fusi ◽  
Salvatore Iaccarino ◽  
Chiara Montomoli ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Garhwal Himalaya ◽  
Main Central Thrust ◽  
Constrained Evolution ◽  
Thrust Zone

scholarly journals Dating protracted fault activities: microstructures, microchemistry and geochronology of the Vaikrita Thrust, Main Central Thrust zone, Garhwal Himalaya, NW India

2018 ◽  
Vol 481 (1) ◽  
pp. 127-146 ◽  
Author(s):  
Chiara Montemagni ◽  
Chiara Montomoli ◽  
Salvatore Iaccarino ◽  
Rodolfo Carosi ◽  
Arvind K. Jain ◽  
...  
Keyword(s):  
Electron Microprobe ◽  
Garhwal Himalaya ◽  
Main Central Thrust ◽  
Content Type ◽  
Mylonitic Foliation ◽  
Link Type ◽  
Thrust Zone ◽  
Supplementary Material ◽  
Structural Boundary

AbstractThe timing of shearing along the Vaikrita Thrust, the upper structural boundary of the Main Central Thrust Zone in the Garhwal Himalaya, was constrained by combined microstructural, microchemical and geochronological investigations. Three different biotite–muscovite growth and recrystallization episodes were observed: a relict mica-1; mica-2 along the main mylonitic foliation; and mica-3 in coronitic structures around garnet during its breakdown. Electron microprobe analyses of biotite showed chloritization and a bimodal composition of biotite-2 in one sample. Muscovite-2 and muscovite-3 differed in composition from each other. Biotite and muscovite 39Ar–40Ar age spectra from all samples showed both inter- and intra-sample discrepancies. Biotite step-ages ranged between 8.6 and 16 Ma and muscovite step-ages between 3.6 and 7.8 Ma. These ages cannot be interpreted as ‘cooling ages’ because samples from the same outcrop cooled simultaneously. Instead, the Ar systematics reflect sample-specific recrystallization markers. Intergrown impurities were diagnosed by the Ca/K ratios. The age data of biotite were interpreted as a mixture of true biotite-2 (9.00 ± 0.10 Ma) and two alteration products. The negative Cl/K–age correlation identified a Cl-poor muscovite-2 (>7 Ma) and a Cl-rich, post-deformational, coronitic muscovite-3 grown at ≤5.88 ± 0.03 Ma. The Vaikrita Thrust was active at least from 9 to 6 Ma at c. 600°C; its movement had ended by 6 Ma.Supplementary material: Thermometric and 39Ar–40Ar data are available at https://doi.org/10.6084/m9.figshare.c.4069076

The Main Central Thrust zone along the Alaknanda and Dhauli Ganga valleys (Garhwal Himalaya, NW India): Insights into an inverted metamorphic sequence

Lithos ◽  
2020 ◽  
Vol 372-373 ◽  
pp. 105669
Author(s):  
Salvatore Iaccarino ◽  
Chiara Montomoli ◽  
Chiara Montemagni ◽  
Hans-Joachim Massonne ◽  
Antonio Langone ◽  
...  
Keyword(s):  
Garhwal Himalaya ◽  
Main Central Thrust ◽  
Thrust Zone

Fluid events and exhumation history of the main central thrust zone Garhwal Himalaya (India)

2001 ◽  
Vol 19 (1-2) ◽  
pp. 207-221 ◽  
Author(s):  
H.K. Sachan ◽  
R. Sharma ◽  
A. Sahai ◽  
N.S. Gururajan
Keyword(s):  
Garhwal Himalaya ◽  
Main Central Thrust ◽  
Thrust Zone ◽  
History Of ◽  
Exhumation History

Measurements of radon flux and soil-gas radon concentration along the Main Central Thrust, Garhwal Himalaya, using SRM and RAD7 detectors

2013 ◽  
Vol 61 (4) ◽  
pp. 950-957 ◽  
Author(s):  
Abhay Anand Bourai ◽  
Sunita Aswal ◽  
Anoop Dangwal ◽  
Mukesh Rawat ◽  
Mukesh Prasad ◽  
...  
Keyword(s):  
Radon Concentration ◽  
Soil Gas ◽  
Garhwal Himalaya ◽  
Main Central Thrust ◽  
Radon Flux ◽  
Soil Gas Radon
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