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  本文選題：全吉群　切入點：全吉地塊　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：柴達(dá)木盆地北緣前寒武紀(jì)沉積蓋層全吉群角度不整合覆蓋在由德令哈雜巖和達(dá)肯大坂巖群組成的全吉地塊變質(zhì)基底之上。前人主要認(rèn)為全吉群時代為南華紀(jì)-震旦紀(jì),底界年齡在760 Ma左右,是新元古代Rodinia超大陸裂解的產(chǎn)物;全吉地塊是從塔里木陸塊裂離出來的一個克拉通碎塊(片),新太古代至古元古代構(gòu)造熱事件及其性質(zhì)與華北陸塊相同或相似,共同響應(yīng)全球Columbia超大陸匯聚事件,其構(gòu)造屬性可能親緣于華北陸塊,但是自新元古代以來,全吉地塊和其塔里木母陸塊與揚子陸塊地質(zhì)演化歷史極其相似。本文選擇全吉地塊之上全吉山、石灰溝南和歐龍布魯克山三處剖面的前寒武紀(jì)沉積蓋層全吉群進行研究,確認(rèn)了全吉群內(nèi)部存在兩個平行不整合面。通過放射性同位素測年、古生物化石和沉積特征的區(qū)域?qū)Ρ鹊鹊姆治?將全吉群解體,厘定后的全吉群包含麻黃溝組、枯柏木組、石英梁組與紅藻山組等四個組,時代歸屬長城紀(jì)。將全吉群底界年齡限定在1.78 Ga左右。認(rèn)為全吉地塊是華北板塊西南緣的一部分,全吉群為Columbia超大陸初始裂解階段的一套裂陷槽沉積序列。
[Abstract]:The angle unconformity of Quanji Group of Precambrian sedimentary caprock in the northern margin of Qaidam Basin is overlaid by the metamorphic basement of the Quan Ji block composed of Delingha complex and Dacken Osaka rock group. The bottom boundary age is about 760Ma, which is the product of Rodinia supercontinent cracking in Neoproterozoic. The whole Kyrgyzstan block is a craton fragment (NeoArchaeo-#china_person0#) tectonic heat event separated from the Tarim continent block, and its characteristics are the same or similar to those of the North China block, and respond jointly to the global Columbia supercontinental convergence event. The tectonic attributes may be related to the North China block, but since the Neoproterozoic, the geological evolution history of the Quan Ji block and its Tarim block is very similar to that of the Yangtze block. In this paper, the Precambrian Sedimentary caprock Quanji Group in three sections of south Liogou and Oulong Brook Mountain is studied, and it is confirmed that there are two parallel unconformities in Quanji Group. Based on the analysis of the regional correlation of paleontological fossils and sedimentary characteristics, the Quanji group was disintegrated. The determined group consists of four groups: mahuanggou formation, Kubamu formation, quartz-liang formation and Hongzaoshan formation. The age belongs to the Great Wall. The age of the bottom boundary of Quanji Group is about 1.78 Ga. It is considered that the Quanji block is a part of the southwestern margin of the North China plate, and the Quanji Group is a set of rift trough sedimentary sequence in the initial pyrolysis stage of Columbia supercontinent.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P534.41

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本文編號：1606383