Abstract
Although relatively little is known about basin formation north of the Himalayas, recent stratigraphic studies of several sedimentary basins (Tarim, Dzhungaria, Tsaidam) have demonstrated a common pattern of subsidence in post-Triassic times1. All these basins show rapid subsidence concurrent with the onset of Himalayan orogenesis, presumably reflecting both tectonic loading and increased sediment supply. Before that time, however, subsidence curves have the characteristic ‘concave-up’ shape of rifted-margin sedimentary environments2. Although data from these basins are not sufficiently detailed to justify a more thorough investigation, the Tadjik Depression, a sedimentary basin comprising the southwestern portion of the Soviet republic of Tadjikistan (Fig. 1), contains a continuous and relatively well documented record of post-Jurassic sedimentation, analysis of which suggests deposition in a rifted-margin environment, on crust thinned by ∼50%.
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