Magnetic polarity stratigraphy of the Upper Siwalik deposits, Pabbi Hills, Pakistan

Details Magnetic polarity stratigraphy of the Upper Siwalik deposits, Pabbi Hills, Pakistan Magnetic polarity stratigraphy of the Upper Siwalik deposits, Pabbi Hills, Pakistan

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..36..187k&link_type=abstract

Earth and Planetary Science Letters, Volume 36, Issue 1, p. 187-201.

Computer Science

10

Scientific paper

Over 1000 m of fluvial molasse, exhibiting a stable detrital remanent magnetization, is exposed in a mammal-bearing sequence in the Upper Siwalik Group of the Pabbi Hills, Pakistan. The magnetic polarity chronology reveals that the sequence records a time period of 2.6 m.y., extending from the early Gauss Normal Epoch into the Brunhes Normal Epoch. During this period, sedimentation rates increased upward in time from 0.25 m/1000 yr to 0.45 m/1000 yr. The sudden disappearance of red beds and a change in the lithoclastic composition of basal channel ands ssuggests that about 800,000 years ago the primary source area began shifting from the metamorphic terrane of the Himalayan Orogen to a more local sedimentary terrane on the folded margins of the Himalayan foredeep. About 500,000 years ago the anticlinal Pabbi Hills attained surface expression. Uplift continued at a minimum rate of 1 m/1000 yr. A local Pliocene/Pleistocene boundary based on the Olduvai Normal Event is clearly recognized. Local fossil finds reveal that Equus, diagnostic element of the Pinjor faunal zone, appeared locally about 1.8 m.y. ago and that Hipparion, a faunal element of the Tatrot and earlier faunal zones, persisted locally until at least 3.0 m.y. ago.

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