HR: 11:25h
AN: T31E-11
TI: New Conductivity Models, and their Implications, of the India-Asia Collision Zone
AU: * Jones, A G
EM: ajones@cg.nrcan.gc.ca
AF: Geological Survey of Canada, 615 Booth St., Room 218 , Ottawa, ON K1A 0E9 Canada
AU: Unsworth, M J
AF: University of Washington, Geophysics Program - 351650, Seattle, WA 98195 United States
AU: Booker, J R
AF: University of Washington, Geophysics Program - 351650, Seattle, WA 98195 United States
AU: Chen, L
AF: China University of Geosciences - Beijing, Dept. of Applied Geophysics, 29 Xueyuan Road, Beijing, K1A 0E9 China
AU: Wei, W
AF: China University of Geosciences - Beijing, Dept. of Applied Geophysics, 29 Xueyuan Road, Beijing, K1A 0E9 China
AB: During 1995, magnetotelluric measurements were made at 49 locations along a 500-km-long north-south profile traversing from the crest of the Himalaya to the centre of the Lhasa block in southern Tibet. Both broadband and long period measurements were made using two different acquisition systems. Preliminary modelling of the initial responses revealed three main features: \1) No strong anomaly associated with the Zangbo suture, \2) High conductivity north of Kangmar, and \3) Deep crustal high conductivity. The data have since been reprocessed, using new variants of the algorithms, and a magnetometer calibration error corrected, to yield more accurate and precise MT response functions. Models derived from these response functions, using different inversion approaches and codes, will be shown, and their geological implications discussed.
UR: http://www.cg.NRCan.gc.ca/staff/jones/tibet/tibet.html
DE: 8015 Local crustal structure
DE: 8045 Role of fluids
DE: 8102 Continental contractional orogenic belts
DE: 8110 Continental tectonics--general (0905)
SC: T
MN: 1999 AGU Fall Meeting