【作者】 杨鸣一；

【导师】 李永军；

【作者基本信息】 长安大学 ， 构造地质学， 2009， 硕士

【摘要】 本文以中天山尼勒克胡吉尔台一带二叠纪沉积地层为研究对象,从野外产出状态、岩相学、岩石组合、沉积环境、生物化石分析、上下地层接触关系、构造环境等方面,对研究区该套沉积地层作了比较系统的研究。通过野外调查及综合研究,取得了如下认识:1.通过调查,厘清了二叠纪地层与上覆地层的接触关系类型,及其内部各组段间的接触关系。其与上覆的下侏罗统八道湾组为断层接触,下部被岩体侵吞,未见底。2.经过调查研究,新发现了乌兰萨依组的存在,确立了其时代为早二叠世。3.早二叠世乌兰萨依组见有波痕、雨痕及泥裂等重要沉积标志。从区域上看,由西向东,地层厚度变化很大,巩留龙口水电站最薄,仅出露21m,向东至尼勒克胡吉尔台地区最厚,达到813.77m,再向西到新源县八音居力克一带又变薄,经分析认为,该组为一套稳定的泛湖相沉积。4.早二叠世乌朗组主体为双峰式火山岩系,证明了后碰撞的松弛拉张使伊犁盆地拉伸再现陆壳火山裂谷。5.晚二叠世晓山萨依组碎屑岩依据其岩石组合、颜色、结构、构造、砾石的分选性、磨圆度等和原生沉积构造等特征,以及所含化石特征,可以初步确定其为干旱、炎热气候的氧化条件下的河流相—湖泊相沉积。更多还原

【Abstract】 This dissertation is object on the sedimentary stratum of Permian period of Central Tianshan. Studying the features of strata in our researching area synthetically, including the field character, lithofacies, rock association,organic fossil analysis,contact relationship between the stratum and tectonics environment, et al. Through the several years of field survey and general research, gained the achievement as follows:1. We have not only clarified the relationship of contaction between the Permian strata and it’s overlying strata, but also have understood the relationship of formations within Permian after field explorationIt and ba dao wan formation of Jurassic, which lays over it, contact With a fault and the rocks intruded the Permian at the bottom.2. A new formation named wulansayi has been found which belongs to the Early Permian.3. The wulansayi formation mainly formed the environment of shallow-water where ripples, rain and mud crack scar and other important deposition signs can be seen.The thickness of strata varys from west to east in region. The thinnest area is Longkou Station in gongliu which only exposed 21m, and the most thickness area lays huji’ertai in Nileke reaching 813.77m towards the east, then to the west(bayinjvlike in xinyuan county),it becomes thin. We think that the formation belongs the stable lacustrine deposits of the pan.4. The wulan formation of early Permian mainly contains the bimodal volcanic rocks which declare that the Yili basin was extruded and volcanic rift in continental crust appearsbecause of the post-collisional extension of the slack.5. Xiaoshansayi formation of Late Permian can be determined to belong to hot climate conditions of the oxidation of the river-the lake sediments temporarily according to the combination of it’s clastic rocks , as well as the color, structure, construction, gravel sorting, rounding, primary sedimentary structures and secondary features.更多还原