Title: New results and major progress in regional geological survey of the Ulan Ul Lake Sheet
Abstract: By geological survey, the authors found that the strata originally assigned to the Rola Kangri Group contain Permian exotic blocks, and Late Permian Changxingian foraminifera is present in tectonic lenticular limestones. A large number of fossil plants are present in the Late Triassic Goulushankecuo Formation, in which Hyrcanopteris of Pteridospermopsida is dominant. This is somewhat different from the case with the Gyiza Group and Tumengela Group of the Tanggula Mountains and the Jiapeila Formation and Bagong Formation of eastern Tibet, in which the Late Triassic flora is dominated by Neocalamites and Equisetites of ferns. Jurassic strata are of the widest distribution and have the most complete succession in this area. Two assemblages, three assemblage zones and three assemblage sub-zones have been established. A highly precise paleomagnetic data-controlled stratigraphic section has been constructed, providing a basis for the determination and correlation of the ages of Tertiary terrestrial red beds. New geochronological results of Cenozoic volcanic lavas covering the largest area in northern Tibet confirm its ages ranging from 40.1 to 44.6 Ma. Isotopic and geochemical analysis clearly indicate an enriched EMⅡ mantle source. The discovery of the Ulan Ul Lake tectonic melange belt provides a new ground for regional tectonic correlation.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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