本文選題：東昆侖東段南坡 + 洪水川組��； 參考：《長安大學(xué)》2015年碩士論文

【摘要】：造山帶沉積巖,是探討造山帶構(gòu)造演化一個(gè)不可忽視的研究對象。造山帶沉積巖物源屬性的研究能為造山帶研究提供較為連續(xù)的構(gòu)造演化證據(jù)。本文通過沉積巖石學(xué)、礫巖礫石統(tǒng)計(jì)、砂巖碎屑組分統(tǒng)計(jì)、巖石地球化學(xué)、碎屑鋯石同位素年代學(xué)等手段,對出露于東昆侖造山帶東段南坡下三疊統(tǒng)洪水川組的物源屬性進(jìn)行綜合研究,并反演東昆侖南緣古特提斯洋早三疊世俯沖造山演化過程,為東昆侖南緣古特提斯洋演化提供沉積學(xué)證據(jù),并取得以下認(rèn)識和進(jìn)展。1、東昆侖南坡下三疊統(tǒng)洪水川組由底至頂可分為6段:一段為紅綠相間碎屑巖組合,二段為淺灰-灰綠色碎屑巖組合,三段為灰黑-深灰色薄層灰?guī)r組合,四段為灰色-灰黑色灰?guī)r與細(xì)碎屑巖組合,五段為深水濁積巖組合,六段為細(xì)碎屑巖組合。其中一、二段為扇三角洲沉積體系,三、四段為淺�；旆e陸棚沉積體系,五段為半深海-深海濁積扇沉積體系,六段為淺海-濱淺�；旆e陸棚沉積體系。2、礫巖礫石統(tǒng)計(jì)結(jié)果顯示,北帶洪水川組a段沉積時(shí)水體較淺,南帶洪水川組第二段沉積時(shí)水體較深,反映沉積盆地北淺南深,物源可能來自北側(cè)。南帶洪水川組第二段礫巖源區(qū)巖石類型主要為變質(zhì)巖、花崗巖及脈石英,具隆升基底特征,初步反映源區(qū)構(gòu)造背景為活動大陸邊緣。3、砂巖碎屑組分統(tǒng)計(jì)顯示,洪水川組下部地層(一、二段)砂巖源區(qū)構(gòu)造背景為活動大陸邊緣;洪水川組上部地層(四、五、六段)源區(qū)構(gòu)造背景為大陸島弧。對應(yīng)的源區(qū)分別為隆升的基底和大陸島弧。4、巖石地球化學(xué)特征顯示,洪水川組下部地層(一、二段)砂巖源區(qū)構(gòu)造背景為活動大陸邊緣,源區(qū)巖石類型包括成熟大陸石英巖、花崗巖、花崗閃長巖及長英質(zhì)火山巖等。洪水川組上部地層(四、五、六段)源區(qū)構(gòu)造背景為大陸島弧,源區(qū)巖石類型包括花崗閃長巖、安山巖、長英質(zhì)火山巖等。5、洪水川組一段LA-ICP-MS碎屑鋯石U-Pb年齡譜顯示,其源區(qū)為加里東期巖漿弧,但洪水川組下部地層地球化學(xué)特征顯示其與活動大陸邊緣相近,因此推測其物源除巖漿弧外,源區(qū)大面積出露有前寒武紀(jì)變質(zhì)巖,因此其物源主要為東昆侖加里東期巖漿弧和前寒武紀(jì)變質(zhì)基底。6、綜合上述資料分析洪水川組物源顯示,洪水川組下部地層(一、二段)砂巖源區(qū)構(gòu)造背景為活動大陸邊緣;洪水川組上部地層(四、五、六段)源區(qū)構(gòu)造背景為大陸島弧。洪水川組下部地層(一、二段)砂巖源區(qū)為東昆侖加里東期巖漿弧與前寒武紀(jì)變質(zhì)基底的混合源區(qū);洪水川組上部地層(四、五、六段)源區(qū)主要為東昆侖早印支期陸緣弧與加里東期巖漿弧,含一定比例的的前寒武紀(jì)變質(zhì)基底。洪水川組源區(qū)下部地層(一、二段)砂巖源區(qū)巖石類型包括石英巖、花崗巖、花崗閃長巖、長英質(zhì)火山巖等;洪水川組上部地層(四、五、六段)源區(qū)巖石類型包括長英質(zhì)火山巖、花崗閃長巖、安山巖以及石英巖、花崗質(zhì)片麻巖等。
[Abstract]:Sedimentary rock of orogenic belt is an important research object in structural evolution of orogenic belt. The study of source properties of sedimentary rocks in orogenic belts can provide more continuous evidence of tectonic evolution for the study of orogenic belts. By means of sedimentary petrology, gravel statistics, sandstone clastic component statistics, rock geochemistry, zircon isotopic chronology, etc. The provenance properties of the Lower Triassic Flood Chuan formation on the south slope of the eastern part of the East Kunlun orogenic belt are studied synthetically, and the early Triassic subduction orogenic evolution of the PaleoTriassic in the southern margin of East Kunlun is inversed. It provides sedimentary evidence for paleoTethys ocean evolution in the southern margin of East Kunlun, and obtains the following knowledge and progress. 1. The Lower Triassic Flood Sichuan formation on the southern slope of East Kunlun can be divided into 6 sections: one is the red and green interfacies clastic rock assemblage, the other is the red and green interfacies clastic rock assemblage. The second member is composed of shallow grayish-grey-green clastic rock assemblage, the third member is gray-dark gray thin layer limestone assemblage, the fourth member is gray-black limestone association with fine clastic rock, the fifth member is deep-water turbidite assemblage, and the sixth member is fine clastic assemblage. The first and second member are fan delta sedimentary system, the third and fourth member are shallow sea mixed shelf sedimentary system, and the five member are semi-deep-sea turbidite fan system. The sixth member is a shallow-shore-shallow-sea mixed shelf sedimentary system. The statistical results of gravel and gravel show that the water body of member a of the North Flood Chuan formation is shallow when it is deposited, and that of the second member of the South Flood Chuan formation is deeper than that of the second member of the South Belt, which reflects the shallow and southern depth of the sedimentary basin. The provenance may come from the north side. The source rocks of the second member conglomerate of the southern belt are mainly metamorphic rocks, granite and vein quartz, with uplift basement features. The tectonic setting of the source area is active continental margin .3. the statistical analysis of sandstone clastic components shows that, The tectonic setting of the sandstone-source area in the lower part of the Hongchuan formation is the active continental margin, and the tectonic setting of the upper strata (fourth, fifth, sixth member) of the flood Sichuan formation is the continental island arc. The corresponding source areas are uplift basement and continental island arc. The petrogeochemical characteristics show that the tectonic setting of the sandstone source area is active continental margin, and the source rocks include mature continental quartzite. Granite, granodiorite and felsic volcanic rocks. The tectonic setting of the source area of the upper strata (member 4, 5, 6) is continental island arc. The source rock types include granodiorite, andesite, felsic volcanic rock, etc. The LA-ICP-MS zircon age spectrum of the first member of the Fongchuan formation shows that the source rocks are composed of granodiorite, andesite, feldspar volcanic rock and so on. The source area is Caledonian magmatic arc, but the geochemical characteristics of the lower part of the Flood Chuan formation show that it is close to the active continental margin. Therefore, it is assumed that the provenance of the source area, except for the magmatic arc, is a large area of Precambrian metamorphic rocks. Therefore, its provenance is mainly Caledonian magmatic arc and Precambrian metamorphic basement. The tectonic setting of the source area of the upper strata (member 4, 5, and 6) of the Hunghuanchuan formation is continental island arc. The source area of the sandstone source area in the lower part of the Hongchuan formation is the mixed source of Caledonian magmatic arc and Precambrian metamorphic basement in East Kunlun. (6) the source region is mainly composed of the early Indosinian continental margin arc and Caledonian magmatic arc in East Kunlun with a certain proportion of Precambrian metamorphic basement. The rock types of the sandstone-source area in the source area of the Sungongchuan formation include quartzite, granite, granodiorite, feldspathic volcanic rocks, etc. The source rocks include felsic volcanic rocks, granodiorite, andesite and quartzite, granitic gneiss, etc.
【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】：P548

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