【作者】 崔庆岗；

【导师】 李旭平；

【作者基本信息】 山东科技大学 ， 矿产普查与勘探， 2011， 硕士

【摘要】 三塘湖盆地位于新疆东北部的,是北疆古生代造山带的重要组成部分,与阿尔泰构造带、乌伦古-库普坳陷带、克拉麦里构造带相间分布,并共同构成北疆盆山构造带。本文对三塘湖盆地石炭纪火山岩作了全面的矿物学、岩石学、构造学、年代学、古生物学等方面的研究工作,结合前人研究成果,运用最新勘探资料,对三塘湖盆地石炭纪火山岩的矿物岩石学特征和地球化学特点进行探讨。三塘湖盆地总体上呈北西向“两隆夹一拗”的宏观格局,即东北冲断隆起带、西南逆冲推覆隆起带与中间所夹持的中央拗陷带,中央拗陷带自西往东依次分为汉水泉凹陷、石头梅凸起、条湖凹陷、岔哈泉凸起、马朗凹陷、方梁凸起、淖毛湖凹陷、苇北凸起、苏鲁克凹陷等九个二级构造单元。盆地石炭纪地层分为上石炭统的巴塔玛依内山组、哈尔加乌组、卡拉岗组和下石炭统姜巴斯套组。盆地火山岩相可分为溢流相、爆发相及火山-沉积相,溢流相大量发育。溢流相和火山-沉积相相对较少。盆地火山岩岩石类型主要有火山碎屑岩、火山熔岩。其中火山碎屑岩有凝灰岩、火山角砾岩、火山集块岩等；火山熔岩有玄武岩、玄武安山岩,不同岩性在纵向上具有明显的韵律性,气孔玄武岩、玄武安山岩主要分布在熔岩流的顶板和底板。主要岩石类型为辉长岩、辉绿岩、辉绿玢岩、橄榄玄武岩、闪长岩、安山岩、安山玢岩、流纹质凝灰岩、熔结质凝灰岩等。对主要元素、微量元素和稀土元素的地球化学研究,依据前人研究成果,大陆玄武岩经过大陆地壳或岩石圈的混染作用,会呈现出似消减带的信号,而使受到混染的大陆玄武岩误判为岛弧玄武岩。通过对特征元素的分析处理,可推断三塘湖地区原始岩浆产生的大地构造环境应该是陆壳板块内部,至少在石炭纪时已经演化为大陆板内环境。更多还原

【Abstract】 The Santanghu Basin takes on a northwest structural framework macroscopically, that is, the center is located the northeast thrust and nappe tectonic and the southwest one,and the center geotectogence is divided into nine sub-tectonic units from east to west, is Hanshuiquan depression, Shitoumei preiection, Tiaohu depression, Chahaquan preiection, Malang depression, Fangliang preiection, Naomaohu depression, Weibei preiection, Suluke depression.Carboniferous stratum partition of the Santanghu basin could be divided into the Batamayinei group, the Haerjiawu group, the Kalagang group and the Jiangbasitao group. Carboniferous volcanic facies of the Santanghu Basin contents overflow facies, outbreak facies and volcanic-sedimentary facies, outbreak facies is most one, then overflow facies and volcanic-sedimentary facies. The main volcanic rocks are pyroclastic rocks and lavas. The volcanic pyroclastic rocks are composed of tuff, volcanic agglomerate, while the lavas are composed of basalt and basaltic andesite. Vesicular basalt and basaltic andesite mainly distributed in roof and floor of the flow unit. The volcanic rocks are gabbro, diabase, diabase porphyrite, olivine basalt, diorite, andesite, andesite, rhyolitic tuff, Melt qualitative tuff and so on. The Santanghu Basin, which is located in the northeast of Xinjiang, is the important part of palezoic orogenic belt in northern Xinjiang. It’s lined with Aermantai, Wukungu-KuPu depression and Kelamaili tectonie zon, and they together made up the north-western basin and mountain tectonic zone. With detailed studies on mineralogy, petrology, geochronology and geochemical together with previous research results and the latest exploration data, this paper presents the new data of mineral petrology and geochemical of rocks from the Sangtanghu Basin, Heilongjian province.Contamination by continental crust or lithosphere can yield subduction type signatures and lead to the misidentification of contaminated continental basalts as arc related ones. Through investigating the geochemical characteristics, we conclude that ingneous rocks from Santanghu region should origin from the tectonic environment of the continental intraplate setting, at least in the time of Carboniferous.更多还原