Physics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..94..329b&link_type=abstract
Earth and Planetary Science Letters, Volume 94, Issue 3-4, p. 329-343.
Physics
19
Scientific paper
The northwest termination of the Himalayan arc is marked by two large antiformal structures, termed syntaxes, and a NW-SE zone of intermediate depth earthquakes which have yielded both strike-slip and thrust-sense fault-plane solutions. This contribution presents new structural data from the Nanga Parbat area, the northern syntaxis, one of the fastest rising portions of the orogen (7 mm yr-1). Our studies show uplift related to syntaxis growth to be accommodated by structures located along its western margin. Fault kinematics in the southern part of the margin indicate NW-directed thrusting along a shear zone and high level cataclastic faults, termed the Liachar thrust zone. This carries amphibolite facies basement rocks out onto Quaternary sediments. Further north along the western margin active faults are dominantly dextral strike-slip, oriented north-south (e.g. the Shahbatot fault). Overprinting relationships suggest that the strike-slip fault zone has migrated southwards into the NW-directed thrust zone. These relationships are consistent with the northwest termination of the arcuate Himalayan thrust belt at a lateral tip generating folding and radial thrust directions. Faulting patterns at Nanga Parbat suggest that this tip zone has migrated southwards. Active faulting is now concentrated in the northwest continuation of the Hazara (southern) syntaxis, along a seismogenic strike-slip and thrust zone. These deep level tips lie on the crustal stacking thrusts which cut through the higher level, SSE-directed thrusts of Pakistan.
Butler Robert W. H.
Knipe Robert J.
Prior David J.
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