發(fā)布時(shí)間：2018-03-11 18:34

  本文選題：二疊系　切入點(diǎn)：佳木河組　出處：《長(zhǎng)安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以新疆西準(zhǔn)噶爾哈拉阿拉特山地區(qū)二疊系沉積地層及火山巖為研究對(duì)象,通過剖面實(shí)測(cè)及路線填圖,對(duì)二疊系的空間展布、巖石組合特征、基本層序、古生物化石以及相互間的接觸關(guān)系等基本特征進(jìn)行詳細(xì)研究,取得了以下認(rèn)識(shí):1.通過對(duì)哈拉阿拉特山地區(qū)二疊系系統(tǒng)全面的研究,理清了研究區(qū)二疊系,自下而上依次為重新厘定的佳木河組、本次新建的白楊河組。2.佳木河組為一套典型的磨拉石建造,巖性主要有淺灰綠色、淺紫紅色、灰褐色、棕色、雜色厚層狀礫巖、粗礫巖、透鏡狀礫巖、礫巖夾含礫長(zhǎng)石砂巖、含礫砂巖、長(zhǎng)石巖屑粗砂巖、中厚層狀礫巖夾灰綠色薄層砂巖、含巨礫中粗礫礫巖、含礫粗砂巖、長(zhǎng)石巖屑中砂巖與雜色中細(xì)礫礫巖互層,局地見粗砂巖透鏡體。下與晚石炭世阿臘德依克賽組海相細(xì)碎屑巖夾火山巖為超覆不整合,上與白楊河組陸相噴發(fā)相中基性火山熔巖、火山碎屑巖為角度不整合,與火山通道相輝綠(玢)巖株、巖脈等為侵入關(guān)系,在該組中采集到保存較完好的植物化石莖稈,細(xì)肋副蘆木Paracalamites stenocostatus、鱗木Lepidodendron,結(jié)合與上下地層的接觸關(guān)系,將該組時(shí)代限定在早二疊世。3.白楊河組為哈拉阿拉特山地區(qū)最晚一次火山活動(dòng)的產(chǎn)物,至今仍保存較完整的火山機(jī)構(gòu)形態(tài),該組巖石組合齊全,火山通道相(集塊巖)—噴出相(火山角礫巖、凝灰?guī)r及少量沉凝灰?guī)r)—溢流相(玄武巖、安山巖)—次火山巖相(輝綠巖墻),噴發(fā)不整合在佳木河組之上,并在玄武巖中獲得鋯石U-Pb年齡為279Ma,將其時(shí)代限定為早二疊世晚期。4.古構(gòu)造環(huán)境分析,研究區(qū)在石炭系由于哈薩克斯坦板塊與準(zhǔn)噶爾洋殼的俯沖與碰撞,西準(zhǔn)噶爾洋盆開始閉合且造山帶開始形成,早二疊世由于造山帶大規(guī)模的自北西向南東推覆,形成一套具前陸盆地性質(zhì)的磨拉石建造,之后由于NW—SE向進(jìn)一步的擠壓,促使地層擠壓變形形成褶皺,并在擠壓松弛期玄武質(zhì)巖漿噴出地表,形成現(xiàn)在我們看到的白楊河組陸相火山機(jī)構(gòu)。
[Abstract]:In this paper, the Permian sedimentary strata and volcanic rocks in the Hara Arrate Mountain area of West Junggar, Xinjiang are taken as the research objects. The spatial distribution of Permian system, the characteristics of rock assemblages, and the basic sequence of the Permian system are studied by the measured section and route mapping. The basic characteristics of paleontological fossils and their contact relations are studied in detail, and the following understandings are obtained: 1.Through the comprehensive study of the Permian system in the Hara Arrate Mountains, the Permian system in the study area has been clarified. The order from bottom to top is the redefined Jiamihe formation, and the newly built Baiyang River formation. 2. The Jiamuhe formation is a typical morlite formation. The lithology is mainly light grayish green, light purplish red, grayish brown, brown, mixed color thick layered conglomerate, coarse conglomerate, etc. Lenticular conglomerate, conglomerate, gravelly sandstone, feldspathic coarse sandstone, medium thick layered conglomerate interbedded with grayish green sandstone, conglomerate conglomerate, conglomerate coarse sandstone, interbedded sandstone and variegated medium and fine gravelly conglomerate in feldspathic lithology. The marine fine clastic rocks of the lower and late Carboniferous Arardisai formation are supersuperimposed unconformities, the basic volcanic lava in the upper and upper continental eruptive facies of the Baiyang River formation, and the pyroclastic rocks are unconformable from the angle of the continental eruptive facies of the Baiyanhe formation. In this group, relatively well-preserved fossil plant stems, Paracalamites stenocostatus and Lepidodendron were collected from the volcanic channel facies, phenophanite (phenophane) plants, veins, etc., which combined the contact relationship with the upper and lower strata. The Baiyanghe formation is the product of the latest volcanic activity in the Hara Arrate Mountains area, and still preserves a relatively complete volcanic structure and assemblage, and its rock assemblage is complete. Volcanic passageway facies (assemblage rock / ejection facies (volcanic breccia, tuff and a small amount of sunk tuff / overflow facies) (basalt, andesite / subvolcanic facies) (diabase dike), erupting unconformity above Jiamuhe formation, A zircon U-Pb age of 279 Ma was obtained from the basalt, and its age was limited to the late early Permian. 4. Paleotectonic environment analysis. The study area in the Carboniferous is due to the subduction and collision between Kazakstan plate and Junggar oceanic crust. The western Junggar ocean basin began to close and the orogenic belt began to form. The early Permian orogenic belt, due to the large-scale northwest-south-east nappe of the orogenic belt, formed a set of mollast-bearing formations with the character of a Foreland basin, and then due to the further compression of NW-SE, During the compressional relaxation period Black Tortoise magma ejected out of the surface and formed the continental volcanic mechanism of Baiyang River formation.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P534.46

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本文編號(hào)：1599393