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《Geological Bulletin of China》 2006-12
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Discovery of early Pleistocene gravels of the Jinsha River in the Daju basin, Yunnan, China, and its significance

Zhao X T, Zhang Y S, Hu D G, Qu Y X. 1. Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029, China; 2. Institute of Geomechanics, Chinese Academy of Geological Sciences,Beijing 100081, China  
This paper reports two beds of early Pleistocene gravels on the western bank of the lower ferry of the Jinsha River in the northern Daju basin, Yunnan. They are located at the base of a thick alluvial and proluvial gravel bed at the bottom of the basin. The gravels in the gravel bed are well sorted and rounded and partly cemented by calcareous materials, and their components are very complicated, most of which are absent in the study area, indicating that they were transported over a long distance by the Jinsha River. The ESR dates of two samples of calcareous cements and sands from the lower bed of gravels are 1950±230 kaBP and 1770±160 kaBP respectively, indicating an early Pleistocene age. The gravel bed is correlated with the gravel bed in the fifth terrace of the Jinsha River containing the mammal fauna of the early Pleistocene Wangbuding Formation at Wangbuding, Dega County, Sichuan Province, in the upper reaches of the river and the bed of alluvial well-sorted and -rounded gravels of complex composition underlain by the middle-late Pliocene lacustrine Xigeda Formation at Panzhihua City, Sichuan, in the lower reaches. The results show that all the sections of the Jinsha River had been joined up and become into a long river by the early Pleistocene and even the Pliocene.
【Fund】: 中国地质调查局国土资源调查项目《滇藏铁路沿线地壳稳定性调查评价》(编号1212010541404)资助
【CateGory Index】: P534.631
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