26al10be dating

1986; Peltzer & Tapponnier 1988a; England & Molnar 1990; Avouac & Tapponnier 1993). An accurate knowledge of the slip-rates along these faults of northern Tibet is essential to assess the large-scale mechanical behaviour of the crust and mantle beneath the plateau, and to test the predictions of various controversial models (e.g.

Their great lateral extent and spatial relationship to high-angle shortening features large thrusts and growing mountain ranges suggest that they play a major role in accommodating Indo-Asian convergence (e.g. England & Houseman 1986; Avouac & Tapponnier 1993; England & Molnar 1997; Meyer Seismotectonic map of northern Tibet.

At two sites along the Dongxi– Anyemaqin segment of the fault, near 99u E, terrace riser offsets ranging from 57 to 400 m with 14C ages ranging from 5400 to 37 000 yr BP yield a minimum slip-rate of ∼10 mm yr.At one site, the 1937 January 7, M=7.5 and the penultimate earthquakes produced 4 m of left-slip and 0.4 m of reverse-slip.This two-staged burial model would thus allow a younger age for the fossil, consistent with the sedimentology of the deposit.This alternative age is also not in contradiction to available faunal and palaeomagnetic data.Similarly, its slip-rate remains poorly constrained. The Quaternary average slip-rate at the Kunlun Pass (Fig.2) has long been estimated to be between 10 and 20mm yr. In a preliminary study in which we pioneered the use of cosmogenic exposure dating to determine the ages of terrace risers offset by the fault, we obtained, at one site east of the Kunlun Pass (site 1, Fig.2), a Late Holocene mean slip-rate of 12±2.6mm yr Large-scale segmentation of Kunlun Fault. Min Shan segment (103°E to 105°E) steps about 50km to the north.

West of 91°E, several segments, with strikes between N70°E and N140°E, linked with normal faults form the broad western horsetail termination. D.- University of California-Berkeley Research Interests Tectonic geomorphology, landscape evolution, cosmogenic nuclides applied to geomorphology and surficial processes, environmental geosciences.Al in quartz grains, and apply it to a sequence of intercalated tills and paleosols in central Missouri, USA, that record Plio-Pleistocene advances of the Laurentide Ice Sheet.Inset shows the location of the map within the India-Asia collision framework.Northern Tibet is bounded by three major left-lateral strike-slip faults: the Altyn Tagh, Kunlun and Haiyuan faults. Inset shows the location of the map within the India-Asia collision framework.1989) ruptured the central stretch of the Kunlun Fault.