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sandstones and mudstones. The Xiyu Formation is mainly composed of grey thick-bedded cobblestones with a few sandstone lenticular bodies, characterized by a rapid accumulated feature. The Wusu Formation is composed of fluvial terrace conglomerates. Field measurements of ratio of conglomerate units in stratigraphic layer show a rapid increase of the ratio occurred in the lower part of the Wuqia Formation. The lower part of the section is dominated by fine-grain sandstone or siltstone, while the upper one is dominantly composed of coarse-grained conglomerates. If we suggest a stable sedimentary velocity in a geological time-period and take 35 Ma and 5 Ma as the beginning and end ages of the sedimentation of the Wuqia Formation (because the paleomagnetic data are still in the lab), the boundary age of the lower part with the upper should be ca. 25 Ma. And according to the thickness of the stratigraphic units, sedimentary velocities could be calculated out: 4.8m/Ma during the Cretaceous, 12m/Ma during the Paleocene to Eocene, 19.7m/ Ma during the Oligocene to Miocene, 180.9m/Ma during the Pliocene, and 651.9m/Ma during the Early Pleistocene. Composition of detritus in sandstone and conglomerate clast 44 samples are selected to analyze the composition of detritus in sandstone by point-counting of more than 300 grains per thin section. Overall, sandstone samples are quartzolithic arenites (Qm=55, F=20, Lt=25). However, lithic fragments (Lt) are less than 20% in sandstone from the Kezilesu(K) to Wuqia Formation and larger than 20% in sandstones from the uppermost part of the Wuqia Formation, while monocrystalline and polycrystalline quartz fragments (Qt=Qm+Qp) decrease from >50 into <50 at the same time. The rapid decrease of volcanic lithic fragments (Lv) occurred between the lower part and upper part of the Wuqia Formation (from 8 down to 5). The metamorphic lithic fragments (Lm), dominated by metamorphic-sedimentary lithic grains, increase from the bottom of the upper Wuqia Formation, and reach its peak at the uppermost part of the Quqia Formation(33). They are also major kind of detritus in sandstone of the Atushi Formation, but Lm is usually less than 5 in Xiyu Formation. Sedimentary lithic fragments (Ls) begin to increase in the uppermost part of the Wuqia Formation and become the dominant composition in Early Quaternary Xiyu conglomerate. 47 sites for point counting analysis of clast composition in conglomerate were completed in the field in 2003. The results show that clast composition in conglomerate is dominated by metamorphic rocks. The content is usually larger than 60%. sedimentary clast and is mainly composed of limestones. The rapid increase of its content occurred in the bottom of the Atushi Formation. The granitic clast is usually less than 10% in content and a few clast is sour or basic volcanic rocks in this section. The ecologite clasts can only be found in the Middle Pleistocene Wusu Formation.

Sedimentation of the Jianggalesayi basin and its response to the unroofing history of the Altyn Tagh, northern Tibetan Plateau