新疆尼勒克县乌拉斯台勘查区沉积特征分析

Analysis on the sedimentary characteristics of Wulasitai exploration area in Nileke county of Xinjiang

伊利盆地是在天山造山带所夹持的微地块上发展演化而形成的山间叠合盆地,尼勒克断陷盆地位于伊利盆地东北部,从尼勒克县城西侧起,沿喀什河直至其源头一带,呈近东西向。乌拉斯台勘查区位于尼勒克断陷盆地的中西部、乌拉斯台乡南部一带,是以侏罗系为主的中新生代断陷盆地,物源来自南北两侧。因为这种近源快速堆积,使该矿区地层不同于伊犁盆地的其他地层,主要表现在:基底为三角洲相,因沉积源未经过长途搬运,就在山前发育冲积扇,使沉积基底不平;由河流、湖泊形成的沼泽相沉积的煤层稳定性较差,煤岩层在倾向、走向上变化大;盆地中心与边缘沉积环境差异明显,盆地中心沉积环境较温和,是主要的聚煤区域,盆地边缘主要沉积分选性差的砾岩。

Erie Basin is an mountain superimposed basin that developed, evolved and formed on the micro-massif clamped by Tianshan Orogenic Beh.Lileke fault basin is in the northeast of Erie Basin,starting from the west of Nileke County,along Kashi River until it＇s source, nearly east-west.Wulasitai Exploration area is located in the midwest of Nileke fault basin and the south of Wulasitai Town, and it is a Jurassic-primarily meso-cenozoic fault basin,the source of which came from north and south.Own to the near-source rapid accumulation, the strata of this mining area is different from other strata of Eric Basin, which nearly displays in： the basement is delta facies, because the deposition source has not been long-distance transport, and it developed alluvial fan in the piedmont, which makes sedimentary base uneven; swamp facies coal seam has poor stability, and the coal strata changes big in tendency and trend; the center of basin and edge sedimentary environment have obvious difference, the sedimentary environment of center is more moderate, and it is the main coal-accumulating area;and the edge mainly deposits the conglomerate with poor sorting characteristics.