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《Journal of Jilin University(Earth Science Edition)》 2006-01
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Dismemberment of Bailazi Formation of the Qinghezhen Group

CHEN Yue-jun~1,PENG Yu-jing~2,LIU Yue-wen~2,SUN Gang~2 1.Research Center of Palaeontology & Stratigraphy, Jilin University, Changchun 130026, China 2.Regional Geological & Mineral Survey of Jilin Province,Changchun 130022,China  
“The Qinghezhen Group” was composed of the Siheshun, Beidagou, Wujiapuzi and Bailazi Formations. In the group, the Bailazi Formation was at the top of the group and was believed to be distributed to the south and north of the Qinghe fault. The formation was once discussed for the presence of microfossils of the deep water facies. The new results from present geological field work show that: to the north of the Qinghe fault, “the Bailazi Formation” is composed of calc-marble and of the metamorphosed volcanics of the alkalic-basalt, monzonitic andesite-quartz keratophyre series and contains the Sinian micro-flora fossils. To the south of the Qinghe fault, “the Bailazi Formation” is composed of the magnesian marble, continental clast-bearing quartz sandstone and the metamorphosed lavas of dacite-rhyolite series. The strata contain no stromatolites and micro-flora fossils which have been discovered in the middle Proterozoic strata in the adjacent Fanhe area to the west and were more intensively metamorphosed and deformed. Thus the strata are supposed to be the Paleo-Proterozoic. Hence, the strata of the so-called Bailazi Formation to the north and south of the Qinghe fault should belong to different strata composed of different rocks and formed in different tectonic units of different natures and in different sedimentary basins, thus should be dismembered. Now the Bailazi Formation to the north and south of the Qinghe fault can be called the Lujiapuzi and the Xibaoan Formation-complex temporarily.
【Fund】: 中国地质调查局项目(200113000047)
【CateGory Index】: P534.3
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