發(fā)布時間：2018-04-15 02:27

  本文選題：原巖建造 + 巖石地球化學(xué)特征��； 參考：《東華理工大學(xué)》2017年碩士論文

【摘要】：早期古大陸的重建、早期大陸地殼的性質(zhì)和演化已成為現(xiàn)代地球科學(xué)的重要前沿課程之一(范志偉,2013)。而烏拉山巖群處于地殼發(fā)展早期高級變質(zhì)地區(qū),其特征和成因的研究對查明該地區(qū)早期地殼形成和演化過程,具有重要的科學(xué)意義。論文依托“內(nèi)蒙古1:50000德布斯格廟、達(dá)拉蓋高勒、廟口幅”區(qū)域地質(zhì)調(diào)查項目。選題為《內(nèi)蒙古中部烏拉山巖群巖石地球化學(xué)特征和原巖建造》。研究區(qū)位于內(nèi)蒙古中部烏拉山地區(qū),大地構(gòu)造位置屬于華北克拉通北緣西部,燕山—陰山中生代板內(nèi)造山帶西段,具有復(fù)雜的大地構(gòu)造背景。本文在充分了解和掌握前人資料和研究成果的基礎(chǔ)上,通過對內(nèi)蒙古中部烏拉山巖群系統(tǒng)的分析研究,查明了烏拉山巖群的空間分布規(guī)律、巖石組合特征、地層層序和巖石學(xué)特征,并以巖石地球化學(xué)數(shù)據(jù)為依據(jù),利用各種原巖恢復(fù)圖解,恢復(fù)了烏拉山巖群的原巖建造,取得了以下認(rèn)識和成果:1、采用“構(gòu)造—巖石—事件”方法,通過野外地質(zhì)勘探以及典型實測剖面,根據(jù)特征標(biāo)志層,結(jié)合巖石組合、分布、顏色、接觸關(guān)系及礦物組成等特征,將烏拉山巖群劃分為五個巖組,從下至上依次為角閃片麻巖巖組、黑云片麻巖巖組、榴云片麻巖巖組、石榴淺粒巖巖組和大理巖巖組。2、角閃片麻巖巖組以斜長角閃巖為標(biāo)志層,主要巖石類型為:黑云角閃斜長片麻巖和角閃斜長片麻巖;黑云片麻巖巖組以石英巖為標(biāo)志層,主要巖石類型為:黑云斜長片麻巖和黑云角閃斜長片麻巖;榴云片麻巖巖組是以富石榴石、矽線石、堇青石為特征的富鋁片麻巖,主要巖石類型為:石榴黑云斜長片麻巖、石榴黑云二長片麻巖、黑云斜長片麻巖;石榴淺粒巖巖組以顏色和礦物含量上存在明顯差異有別于榴云片麻巖巖組,主要巖石類型為:淺灰色黑云石榴二長淺粒巖、石榴斜長淺粒巖、矽線石榴變粒巖;大理巖巖組以蛇紋石化大理巖為特征。3、通過對地層特征、巖石類型、變質(zhì)原巖恢復(fù)圖解等方面綜合分析,認(rèn)為角閃片麻巖巖組原巖建造為火山巖夾一定量的碎屑沉積組成的火山—沉積建造;黑云片麻巖巖組為火山—沉積建造;榴云片麻巖巖組是以復(fù)礦物砂巖、雜砂巖、泥巖、陸相粘土巖為主的細(xì)碎屑沉積建造;石榴淺粒巖巖組原巖為雜砂巖的粗碎屑沉積建造;大理巖巖組為化學(xué)沉積建造�？傮w呈現(xiàn)出火山碎屑沉積—化學(xué)沉積的沉積旋回。
[Abstract]:The reconstruction of the early paleocontinent and the nature and evolution of the early continental crust have become one of the most important courses in modern geoscience.The study of the characteristics and genesis of the high grade metamorphic area in the early crustal development of the Wulashan rock group is of great scientific significance to the study of the formation and evolution of the early crust in this area.The paper relies on the regional geological survey project, I. e., Inner Mongolia 11: 50000 Debusig Temple, Dala Gegol, Miaokouzhuang.The selected topic is "petrogeochemical characteristics and original rock formation of the Wulashan rock group in central Inner Mongolia".The study area is located in the Wulashan area of central Inner Mongolia. The tectonic location is located in the western part of the northern margin of North China Craton and the western part of the Mesozoic intraplate orogenic belt of Yanshan-Yinshan, which has a complex tectonic background.On the basis of fully understanding and mastering the previous data and research results, the spatial distribution law and rock assemblage characteristics of the Wulashan rock group in the central part of Inner Mongolia have been found out through the analysis and study of the rock group system in this paper.Based on the stratigraphic sequence and petrological characteristics, and based on the petrogeochemical data, the original rock formation of the Wulashan rock group was restored by using various original rock restoration diagrams. The following knowledge and results were obtained: 1. The tectonic-rock-event method was adopted.By means of field geological exploration and typical measured profiles, according to the characteristic marker layer, combined with the characteristics of rock assemblage, distribution, color, contact relationship and mineral composition, the Wulashan rock group is divided into five rock formations.From the bottom to the top are hornblende gneiss formation, black cloud gneiss formation, eclogite gneiss formation, pomegranite formation and marble formation. The amphibolite is the marker layer of hornblende gneiss formation.The main rock types are: hornblende long gneiss and hornblende gneiss, the black cloud gneiss formation is marked by quartzite, and the main rock types are: black cloud amphibolite gneiss and black cloud hornblende plagioclase gneiss;The eclogite gneiss is aluminum-rich gneiss characterized by rich garnet, sillimanite and cordierite. The main rock types are: pomegranate black cloud plagiocline gneiss, pomegranate black cloud bigneiss, black cloud plagioclase gneiss;There are obvious differences in color and mineral content between the pomegranite formation and the eclogite gneiss formation. The main rock types are: light gray black cloud pomegranate, pomegranate plagioclase, siliceous pomegranate granulite;The marble formation is characterized by serpentinized marble. Through the comprehensive analysis of stratigraphic characteristics, rock types, metamorphic original rock restoration diagrams, etc.,It is considered that the original formation of hornblende gneiss is volcanic sedimentary formation composed of volcanic rocks with a certain amount of clastic deposits, the black cloud gneiss formation is volcanic-sedimentary formation, and the eclogite gneiss formation is composed of composite mineral sandstone, complex sandstone and mudstone.The continental claystone is dominated by fine clastic sedimentary formation; the pomegranate shallow-grained rock formation is composed of coarse clastic sedimentary formation of complex sandstone; and the marble formation is chemically sedimentary formation.There is a sedimentary cycle between pyroclastic and chemical deposits.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P587

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