Vol.3 No.6 (December 2013)
Developing of Late Permian Coal-Bearing Marine Basins in South-Southwest Mongolia and Regularities of Coalbed Occurrence
残留海盆发育； 煤层赋存规律； 塔温陶勒盖组； 同生正断层； 晚二叠世； 南戈壁盆地； 蒙古西南部； Residual Marine Basin’s Developing； Coalbed Occurrence Regularities； The Tavan Dolgoi Formation； Contemporaneous Normal Faults； Late Permian； The South Gobi Basin； Southwest Mongolia
One of the main features of evolution of the south branch of the Paleo-AsianOceanwas that there developed residual marine basins after disappearance of the oceanic crust. In southMongoliaand its neighboring areas, the residual marine basins experienced two developing stages: Early-Middle Permian and Late Permian. Correspondingly, two main sedimentary cycles could be recognized, and each one was an upward-fining succession composed of the basal conglomerates and upper fine clastic rocks. The Late Permian coal-bearing strata in theSouthGobiBasinis named the Tavan Dolgoi Formation, which can be separated into three members lithologically. Five coal seams occurred during Late Permian, called the basal, the lower, the middle, the upper and the top seams respectively, which showed a tendency that the coal-forming process might be earlier in the east and reversal of the marine basins earlier in the west. Based on analyses of the stratigraphic columns and distribution of coal-bearing strata in the main orefields, the regularities of coalbed occurrence were summarized, which pointed out the roles of depositing locations and contemporaneous normal faults in the coal-forming process. To be an extensional basin related to collapse of the collisional orogenic belt, superimposed the rifting of the latitudinal faults and the transtension of NE-striking faults, resulted in the South Gobi region to keep on a wide marine basin during Late Permian, and the peat marsh developed repeatedly in the open littoral plain for a long time, which made it become a coal-rich basin. The transgression occurred in SW Mongolia and theSouthGobiBasinexpanded during deposition phase of the middle coal seam, so that the deposition phase of the upper coal seam was a flourished time for coal-forming process.
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