本文選題：泥盆系特征 + 沉積環(huán)境��； 參考：《長安大學(xué)》2015年碩士論文

【摘要】：本文以新疆巴里坤下澇壩-石灰窯一帶的泥盆系作為研究對象,在廣泛收集前人成果資料的基礎(chǔ),經(jīng)過充分的野外考察和室內(nèi)綜合分析對研究區(qū)泥盆系分布、層序、地層單元劃分、巖石組合、接觸關(guān)系、古生物化石、火山巖及地球化學(xué)特等基本特征進行了系統(tǒng)的研究,取得以下的認識:1調(diào)查區(qū)內(nèi)泥盆系發(fā)育有下泥盆統(tǒng)大南湖組(D1d)和上泥盆統(tǒng)康古爾塔格組(D3kg),大南湖組與下覆奧陶系廟爾溝組為不整合接觸;與上覆康古爾塔格組為不整合接觸;其間缺失中泥盆統(tǒng)。上泥盆統(tǒng)康古爾塔格組與上覆下石炭統(tǒng)黑山頭組為整合接觸。表明在研究區(qū)泥盆紀地層發(fā)育與天山南側(cè)的土哈盆地的泥盆系有明顯的不同。2上泥盆統(tǒng)康古爾塔格組的巖石特征在調(diào)查區(qū)東西部具有明顯的的變化,東部正常沉積碎屑巖較少,火山巖多,中部出現(xiàn)火山巖,西部以正常沉積碎屑巖為主。根據(jù)這個現(xiàn)象可以判斷出,晚泥盆世調(diào)查區(qū)內(nèi)由西向東火山活動呈增強的趨勢。3.通過對下泥盆統(tǒng)大南湖組的巖石成分、層理構(gòu)造、火山碎屑等特征等研究,揭示出大南湖組底部至中部的沉積地層顯示出一個海退序列。而該組上部主要為一套火山碎屑巖夾少量火山碎屑沉積巖及中基性火山巖,通過巖石化學(xué)等分析判斷該段火山巖的噴發(fā)環(huán)境應(yīng)該是洋島環(huán)境。4.通過對新疆八里坤下澇壩-石灰窯一帶泥盆紀地層的變質(zhì)變形特征和接觸關(guān)系的研究,劃分出早泥盆是構(gòu)造層和晚泥盆世-早石炭世的構(gòu)造。
[Abstract]:In this paper, the Devonian system in the area of Xiwei-Ba-Lime Kiln, Balikun, Xinjiang, is taken as the research object. On the basis of extensive collection of previous data, the distribution and sequence of Devonian system in the study area are studied through full field investigation and indoor comprehensive analysis. The basic characteristics of stratigraphic unit division, rock assemblage, contact relationship, paleontological fossils, volcanic rocks and geochemistry are systematically studied. The following understandings were obtained: the Devonian developed in the area of 1: 1: lower Devonian Dannanhu formation (D1d) and Upper Devonian Kangguertag formation (D3kg), the Dananhu formation and the Lower Ordovician Miaoergou formation were unconformable contacts, and the upper Devonian Kangguertag formation was unconformable contact with the upper Devonian Kangguertag formation, and the lower Ordovician Miaoergou formation was unconformable contact with the upper Devonian formation. The middle Devonian system is missing. The upper Devonian Kangguertag formation and the upper Carboniferous Keshantou formation are integrated contact. It shows that the Devonian stratigraphic development in the study area is obviously different from that in the Tuha basin on the south side of Tianshan Mountains. 2. The rock characteristics of the upper Devonian Kangguertag formation have obvious changes in the east and west of the investigation area, and the normal sedimentary clastic rocks in the eastern part of the study area are less. There are many volcanic rocks, there are volcanic rocks in the middle, and normal sedimentary clastic rocks dominate in the west. According to this phenomenon, the late Devonian survey area shows an increasing trend of volcanic activity from west to east. Based on the study of the rock composition, bedding structure and pyroclastic characteristics of the Dananhu formation in the Lower Devonian, it is revealed that the sedimentary strata from the bottom to the middle of the Dananhu formation show a regressive sequence. The upper part of the group is mainly composed of a set of pyroclastic rocks with a small amount of pyroclastic sedimentary rocks and medium-basic volcanic rocks. The eruption environment of the volcanic rocks in this section should be oceanic island environment by petrochemical analysis. Based on the study of the metamorphic deformation characteristics and contact relationship of Devonian strata in the area of Xianwei-Ba-Liyao in Balikun, Xinjiang, it is concluded that the early Devonian is a tectonic layer and the late Devonian to early Carboniferous structure.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P534.4

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