RADIOLARIAN FOSSILS FROM CHERT GRAVELS OF TRIASSIC CONGLOMERATE IN NW MARGIN OF THE TARIM BASIN AND THEIR GEOLOGICAL SIGNIFICANCE
Li Yuejun1, Sun Longde2, Wu Haoruo1, Wang Guolin2, Su Yushan3, Huang Zhibin2
1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029; 2. Tarim Oil Field Branch Company, China National Petroleum Corp., Korla, Xinjiang 841000; 3. China University of Geosciences, Beijing 100083
Kurgan is a frontier station at the western terminal of Chinese South Tianshan, NW margin of the Tarim Basin, where the Mesozoic coal-bearing molasse formation well developed. 30 specimens of chert gravel were collected from the bottom of conglomerate of the Middle Upper Triassic Kelamayi Formation, from which 46 individual radiolarian fossils were found from 12 specimens. The fossils included Albaillella paradoxa Deflandre, Albaillella sp. cf. Albaillella paradoxa Deflandre, Albaillella sp., Latentifistula sp., Latentifistulidae gen. et sp. indet., Follicucullus sp. aff. Follicucullus bipartitus Caridroit et De Wever, Follicucullus sp. and Spumellaria gen. et sp. indet. Two radiolarian assemblages could be identified: one being early Early Carboniferous assemblage represented with Albaillella paradoxa and Albaillella sp. cf. Albaillella paradoxa, another being Middle Late Permian assemblage represented with Follicucullus sp. and Follicucullus sp. aff. Follicucullus bipartitus. This new discovery indicated the Carbono Permian chert provenance for Triassic deposits in Kurgan region, which might be from ophiolitic m閘ange of the Chinese South Tianshan orogenic belt.
Li Yuejun,Sun Longde,Wu Haoruo et al. RADIOLARIAN FOSSILS FROM CHERT GRAVELS OF TRIASSIC CONGLOMERATE IN NW MARGIN OF THE TARIM BASIN AND THEIR GEOLOGICAL SIGNIFICANCE[J]. Chinese Journal of Geology, 2004, (2): 153-158.