Other
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002e%26psl.203...45s&link_type=abstract
Earth and Planetary Science Letters, Volume 203, Issue 1, p. 45-57.
Other
2
Scientific paper
In metacarbonates of the Lesser (LH) and Tethyan (TH) Himalayas of Kumaon/Garhwal (N-India) characteristic remanent magnetisations carried by pyrrhotite (unblocking temperatures: 250-330°C) and magnetite (demagnetising spectra: 15-50 mT) have been identified. Negative fold tests indicate remanence acquisition after the main folding phase, which is of short-wavelength character and occurs during the early orogenese of the Himalayas. A thermal or thermochemical origin of magnetisation is likely and the age of remanence acquisition is indicated to be about 40 Ma by 40K/39Ar cooling and 40Ar/39Ar crystallisation ages. In the Kumaon LH a long-wavelength tilting is indicated by a distribution of the remanence directions along a small-circle in N-S direction. Steepening of the remanence directions in the TH related to ramping on the Main Central Thrust (MCT) was not observed, in contrast to other related studies. In the Alaknanda valley of LH a 38+/-8 Ma age of remanence acquisition is supported by comparison of observed inclinations to the apparent polar wander path of India. Clockwise rotation of 20.3+/-11.7° (LH/Alaknanda valley) and 11.3+/-8.5° (TH) with respect to the Indian plate is observed, indicating that there is no significant evidence for rotational shortening along the MCT since about 40 Ma. Our results suggest that most of rotational underthrusting and oroclinal bending has not been accommodated by the MCT, but by the main thrusts south of it. The latest Miocene/Pliocene age of the Main Boundary Thrust indicates that oroclinal bending is a late-orogenic process.
Appel Erwin
Crouzet Catherine
Gautam Pratima
Schill E.
Singh Vineet K.
No associations
LandOfFree
Where did rotational shortening occur in the Himalayas? - Inferences from palaeomagnetic remagnetisations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Where did rotational shortening occur in the Himalayas? - Inferences from palaeomagnetic remagnetisations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Where did rotational shortening occur in the Himalayas? - Inferences from palaeomagnetic remagnetisations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1421820