本文選題：塔里木盆地 + 震旦紀(jì)　； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：震旦紀(jì),在塔里木盆地上震旦統(tǒng)奇格布拉克組發(fā)育有一套出露較好的疊層石,雖然對(duì)于塔里木盆地疊層石的研究前人已經(jīng)有所涉及,但是絕大多數(shù)都是限于對(duì)疊層石的分布及類(lèi)型做出了研究,并沒(méi)有一個(gè)針對(duì)于震旦紀(jì)時(shí)期的系統(tǒng)的全面的疊層石的認(rèn)識(shí)。本文通過(guò)大量的野外露頭地質(zhì)和室內(nèi)薄片鑒定,分析了該區(qū)疊層石的特征、沉積環(huán)境及其演化,并利用研究疊層石,從另一種新的方法來(lái)探討該區(qū)的沉積環(huán)境演化。該研究區(qū)位于塔里木盆地西北緣阿克蘇、烏什、柯坪之間,研究區(qū)主要進(jìn)行了三條剖面的研究,烏什剖面、奇格布拉克組剖面、什艾日克剖面。按照疊層石沉積環(huán)境的不同,分為四個(gè)大類(lèi),十幾種不同類(lèi)型的疊層石,這些疊層石包括:層狀疊層石(繼承體)、波狀疊層石(非繼承體)、丘狀疊層石、具核疊層石、圓筒狀朱魯沙疊層石(相似體)、林尼爾疊層石、柱狀疊層石(彭縮體)、柱狀疊層石(棒狀體)、柱狀疊層石(規(guī)則體)、錐狀疊層石、卷心菜狀疊層石。本文在通過(guò)野外觀察,室內(nèi)分析,以及對(duì)該區(qū)震旦紀(jì)通過(guò)三個(gè)剖面的疊層石橫向、縱向?qū)Ρ确治鰜?lái)得出結(jié)論。不同類(lèi)型的疊層石,其成因意義也各不相同,本文利用其形態(tài)的差異來(lái)推測(cè)其沉積環(huán)境,然后進(jìn)行橫向、縱向的分析�？v向?qū)Ρ确治鲇^察發(fā)現(xiàn):烏什剖面地區(qū)附近海平面是由淺到深,再由深到淺,最后再次加深的過(guò)程;而蘇蓋特布拉克剖面地區(qū)附近海平面是由淺到深再快速變淺的過(guò)程;什艾日克剖面地區(qū)附近海平面是地勢(shì)較高,海平面變化不大,基本保持在潮間帶-潮上帶過(guò)渡的過(guò)程。該區(qū)震旦紀(jì)通過(guò)三個(gè)剖面疊層石的橫向?qū)Ρ扔^察分析發(fā)現(xiàn):在震旦紀(jì)早期,從塔里木盆地西北緣的北側(cè)烏什剖面,延伸至西側(cè)的蘇蓋特布拉克剖面,再延伸至東側(cè)的什艾日克剖面,海水為從西南側(cè)向東北側(cè)逐漸變淺的變化;在震旦紀(jì)中期,海水深度大致相同,都處在潮間帶-潮上帶的部位;在震旦紀(jì)晚期,海水為由北向南逐漸變淺的環(huán)境,烏什剖面處于潮下帶的位置,什艾日克剖面處于潮間帶-潮上帶的位置。
[Abstract]:In the Sinian, there was a set of stromatolites developed in the Upper Sinian Chigebrak formation of the Tarim Basin, although the previous studies of stromatolites in the Tarim Basin have been involved. However, most of them are limited to the distribution and type of stromatolites, and there is no comprehensive understanding of stromatolites in the Sinian system. In this paper, the characteristics, sedimentary environment and evolution of stromatolites in this area are analyzed by means of a large number of outcrop geology and laboratory sheet identification, and the evolution of sedimentary environment in this area is discussed from another new method by studying stromatolites. The study area is located between Aksu, Wushi and Keping on the northwest margin of Tarim Basin. Three sections have been studied in the study area: the Wushi section, the Chigebrak formation section, and the Shiijek section. According to the different sedimentary environments of stromatolites, they can be divided into four categories. There are more than a dozen different types of stromatolites. These stromatolites include: layered stromatolites (inheriting bodies), wavy stromatolites (non-inheriting bodies), hillock stromatolites, nuclear stromatolites, Cylindrical Jurusa stromatolites (similar bodies, Linnier stromatolites, columnar stromatolites, regular bodies, tapered stromatolites, cabbage-like stromatolites. In this paper, a conclusion is drawn by field observation, laboratory analysis and comparative analysis of stromatolites from three sections of the Sinian in this area. Different types of stromatolites have different genetic significance. In this paper, the sedimentary environment of stromatolites is estimated by their morphological differences, and then analyzed horizontally and longitudinally. The longitudinal comparative analysis shows that the sea level near the Wushi section is from shallow to deep, then from deep to shallow, and finally deepens again, while the sea level near Sugetebrak section is a process from shallow to deep and rapidly becoming shallow. The sea level near the Shijic section is relatively high, and the sea level changes little, and is basically maintained in the process of transition between the intertidal zone and the upper tidal zone. The horizontal correlation analysis of stromatolites in three sections in this area shows that in the early Sinian period, from the northern Wushi section of the northwestern margin of the Tarim Basin to the west Sugait-Bulak section, The sea water is gradually shallower from the southwest to the northeast. In the middle of the Sinian, the depth of the sea water is about the same, which is located in the intertidal zone and the upper tidal zone; in the late Sinian period, the depth of the sea water is similar to that of the upper tidal zone, and in the late Sinian period, The sea water is gradually shallower from north to south, the Wushi section is located in the subtidal zone, and the Shiijk section is located in the intertidal zone and the upper tidal zone.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：P534.31
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本文編號(hào)：1959444