本文關(guān)鍵詞： 古近紀 特提斯洋 浮游有孔蟲 生物地層 亞東　出處：《中國地質(zhì)大學(北京)》2015年碩士論文　論文類型：學位論文

【摘要】：青藏高原是在中生代以來印度板塊與亞洲板塊碰撞作用下形成的,并成為全球地學界普遍關(guān)注的課題。但迄今為止學者們?nèi)圆荒軠蚀_確定它們碰撞的起始時間,特別是這一過程中特提斯洋的閉合時間。其原因是多方面的,本文認為碰撞符合通行的陸 陸碰撞模式,研究特提斯洋閉合時間,可為印度板塊與亞洲板塊的碰撞演化過程提供一個重要的時間約束,因此就可以通過對浮游有孔蟲生物地層學的研究來尋找研究區(qū)的海相地層消失的時間,進而為特提斯洋的封閉和碰撞的起始時間提供時間約束。在我國古近紀沉積類型主要是陸相的,只有在西藏、新疆以及臺灣的部分地區(qū)才發(fā)育有海相古近紀地層(萬曉樵,1987)。藏南地區(qū)保存有連續(xù)的海相古新世到始新世地層,這些地層中保存著在特提斯海具有廣泛分布特性的化石,它們不僅種類多、而且數(shù)量豐富,其生物演化序列能夠與歐洲阿爾卑斯經(jīng)典特提斯研究區(qū)相對比。藏南亞東地區(qū)曾是特提斯演化晚期殘留海的居留地,具有很高的研究意義。本文選擇位于特提斯喜馬拉雅南亞帶、古近紀海相地層發(fā)育連續(xù)、微體化石豐富的亞東堆納古魯浦地區(qū)進行極為詳細的浮游有孔蟲生物地層學的研究,共鑒定出浮游有孔蟲25屬121種,劃分出7個化石帶:Morozovella formosa formosa帶、Morozovella aragonensis帶、Acarinina pentacamerata帶、Morozovella spinulosa Acarinina bullbrooki帶、Globigerina officinalis Turborotalia cerroazulensis cerroazulensis帶、Truncorotaloides rohri帶、Globigerinatheka semiinvoluta帶。根據(jù)對古魯浦剖面中浮游有孔蟲的研究,認為研究區(qū)內(nèi)遮普惹組砂巖頁段頂部沉積時代可達Priabonian中期。
[Abstract]:The Qinghai-Xizang Plateau was formed by the collision of the Indian plate and the Asian plate since Mesozoic, and has become a subject of general concern in the global geosciences. But so far, scholars have not been able to determine exactly when the collision began. In particular, the closing time of the Tethys ocean in this process is due to many reasons. In this paper, it is considered that the collision accords with the prevailing continental collision model, and the closing time of the Tethys ocean is studied. It can provide an important time constraint for the collision and evolution of the Indian plate and the Asian plate, so we can find the time of the marine strata disappearing in the study area through the study of planktonic foraminiferal biostratigraphy. Thus providing time constraints for the start time of the closure and collision of the Tethys Ocean. In China, the Paleogene sedimentary types are mainly continental, only in Tibet, It was only in Xinjiang and parts of Taiwan that marine Paleogene strata were developed (Wan Xiaoqiao and 19870.The southern Tibetan area has a series of marine Paleocene to Eocene strata, in which fossils with widespread distribution in the Tethys Sea are preserved. They are not only abundant in species, but also abundant in quantity, and their biological evolution sequences can be compared with those of the European Alps classic Tethys study area. The southern and eastern regions of Tibet were once the residence sites of the residual seas in the late Tethys evolution. In this paper, a detailed study of planktonic foraminiferal biostratigraphy in the southern Asian belt of the Tethys Himalayas with continuous development of Paleogene marine strata and abundant microfossils in the Nagurupu area of Yadongdui has been carried out. A total of 121 species belonging to 25 genera of planktonic foraminifera were identified, and 7 fossilized zones, Morozovella formosa formosa, Morozovella aragonensis, Acarinina pentacamerata, Morozovella spinulosa spinulosa Acarinina bullbrooki, Globigerina officinalis Turborotalia cerroazulensis cerroazulensis, Truncorotaloides rohri, Globigerinatheka semiinvoluta, were identified. It is considered that the top depositional age of sandstone in the Zapuyakarta formation in the study area can reach the middle of Priabonian.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：Q915

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本文編號：1507721