【作者】 岳艳；

【导师】 柳益群；

【作者基本信息】 西北大学 ， 矿物学、岩石学、矿床学， 2010， 硕士

【摘要】 觉罗塔格造山带位于吐哈盆地和中天山地块之间,造山带宽30-50km,长600m以上。该造山带石炭纪处于海陆转换、构造变革的重要时期。由于与其相邻的吐哈盆地钻遇石炭系的井位较少且分布范围局限,前人对于该地区的研究比较匮乏,因而对于其地层划分、构造属性等问题争议较大,岩相古地理方面的研究成果几乎没有。本文以地层学、沉积学、地球化学、古生物学及大地构造学的原理和基本研究方法为指导,采用多学科综合、盆山结合的方法对觉罗塔格造山带及吐哈盆地南缘石炭系进行了体现活动论思想的构造-岩相古地理研究。通过野外剖面实测,建立了觉罗塔格造山带及吐哈盆地南缘石炭纪的基准剖面,结合古生物及同位素测年分析进行了地层划分和对比,在此基础上依据相标志、沉积构造及剖面结构进行了沉积相的划分及横向对比,确立了沉积相模式,主要有海相三角洲--滨浅海-陆棚相组合及三角洲-潮坪-浅海-次深海相组合。在底坎尔和西大沟剖面晚石炭世底坎尔组首次发现西伯利亚板块石炭—二叠纪的代表化石巴恰特匙叶(Noeggrathiopsis batschatensis)植物化石,以此判断准噶尔地块(包括吐哈盆地)与西伯利亚板块已碰撞对接,古亚洲多岛洋已不复存在。再结合对雅满苏东大沟晚石炭世底坎尔组枕状熔岩的地球化学特征及火山岩岩石组合类型,研究表明该区晚石炭世火山岩系具有大陆裂谷火山岩系的岩石地球化学特点,晚石炭世研究区东部处于大规模造山后板内裂谷拉张的构造背景。通过编制研究区石炭纪构造-岩相古地理图,认为研究区早石炭世经历了逐渐海侵的过程,沉积类型多样,主要以滨浅海相沉积为主,早石炭世早期岩性主要为中性火山岩及火山碎屑岩,早石炭世晚期岩性主要为灰、灰黑色碳酸盐岩夹凝灰质碎屑岩沉积,含丰富的浅海相动物化石；晚石炭世,伴随部分地区海退,滨浅海相沉积类型范围缩小,海相三角洲范围扩大,岩性主要为凝灰质碎屑岩为主夹泥岩、灰岩、硅质岩等。更多还原

【Abstract】 Jueluotage tectonic belt located in the middle of the Turpan-Hami Basin and the Tianshan tectonic belt, the belt width of 30-50km, more than 600km long. The Carboniferous orogenic is an important period of structural change. Because the Turpan-Hami basin and adjacent Carboniferous lack of studies of the region, and thus for the stratigraphic classification and controversial issues have little research. In this paper, use the stratigraphy, sedimentology, geochemistry, paleontology and tectonics theory and basic research methods as a guide, approach to the southern margin of the Turpan-Hami basin and mountain belt Jueluotage, Carboniferous reflect the activities carried out on the thinking of the structure - lithofacies paleogeography.The investigation and measure of the four outcrops in research region, combined with paleontology and isotopic dating of the sedimentary facies analysis division and lateral contrast, established a facies model, mainly marine delta - neritic - Combination shelf and delta - tidal - shallow water - plays deep - deep-sea basin faciesIn the Dikaner and Xidagou section firstly found Permian fossils Bartschat key representatives of leaves (Noeggrathiopsis batschatensis) plant fossils, to judge the Junggar block (including vomit Hami Basin) collision between the Siberian plate has docked, the ancient Asian archipelagic ocean no longer exists. Combined with the major groove of the Ya-Man Soviet Union and Eastern end of the Late Carboniferous Canale Group pillow lava and geochemistry of volcanic rock assemblage types, studies show that the Later Carboniferous volcanic rocks in the area has a continental rift volcanic rock geochemical characteristics, Later Carboniferous in the eastern part of the study area after a large-scale orogenic extensional plate rift tectonic setting.Through the study of the paleogeography that in the Early Carboniferous transgression through a gradual process, and volcanic, sedimentary types of diversity, mainly in littand shallow marine facies, the early Carboniferous rocks include the acid volcanic rocks and pyroclastic rocks, the late Early Carboniferous lithology is gray, gray and black folder tuffaceous carbonate clastic sediments, with abundant shallow marine fossils; Late Carboniferous, accompanied by some area regression, littoral and shallow marine facies types is reduced, and marine tidal delta phase expanded main lithology is dominated by clastic tuffaceous mudstone, limestone, siliceous rocks.更多还原