新疆阿勒泰地区二叠系煤层赋存特征及聚煤成因分析

Permian Coal Seam Hosting Features and Coal Accumulation Genesis in Altay Prefecture, Xinjiang

阿勒泰地区哈尔交煤矿是新疆二叠系含煤的典型矿区,含煤地层为下二叠统卡拉岗组,岩性为凝灰质的砂岩、泥岩、砂砾岩、沉凝灰岩夹煤层及凝灰岩。煤层赋存于第三段,含全区可采煤层4层,平均可采总厚为11.06 m。研究区在早二叠世早期火山喷发之后出现了短暂的宁静期,开始了含煤地层沉积,适宜的沉积环境使聚煤作用发生,后期岩浆活动破坏了聚煤作用的持续,同时受热液的影响,区内煤变质程度较高,约90%为无烟煤。

The Kharjo coalmine in Altay Prefecture is a typical Permian coal-bearing mine area in Xinjiang. Coal-bearing strata belongto the lower Permian Karagon Formation, lithology is tuffaceous sandstone, mudstone, sandy conglomerate, tuffite intercalated with coalseams and tuff. Coal seams hosted in the third member, including regionally mineable 4 coal seams, average mineable total thickness11.06 m. After earlier Early Permian Epoch volcanic eruption, a short stillstand appeared in the study area, thus started coal-bearingstrata deposition. Preferable sedimentary environment made coal accumulation happening. Consequent periodic magmatic activities in-terrupted coal accumulation sustaining, meanwhile because of impacts from hydrotherm or geotherm made high degree of coal metamor-phism, about 90% coal turned into anthracite.