本文關(guān)鍵詞： 古近紀(jì) 特提斯洋 浮游有孔蟲 生物地層 亞東　出處：《中國(guó)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】：青藏高原是在中生代以來(lái)印度板塊與亞洲板塊碰撞作用下形成的,并成為全球地學(xué)界普遍關(guān)注的課題。但迄今為止學(xué)者們?nèi)圆荒軠?zhǔn)確確定它們碰撞的起始時(shí)間,特別是這一過(guò)程中特提斯洋的閉合時(shí)間。其原因是多方面的,本文認(rèn)為碰撞符合通行的陸 陸碰撞模式,研究特提斯洋閉合時(shí)間,可為印度板塊與亞洲板塊的碰撞演化過(guò)程提供一個(gè)重要的時(shí)間約束,因此就可以通過(guò)對(duì)浮游有孔蟲生物地層學(xué)的研究來(lái)尋找研究區(qū)的海相地層消失的時(shí)間,進(jìn)而為特提斯洋的封閉和碰撞的起始時(shí)間提供時(shí)間約束。在我國(guó)古近紀(jì)沉積類型主要是陸相的,只有在西藏、新疆以及臺(tái)灣的部分地區(qū)才發(fā)育有海相古近紀(jì)地層(萬(wàn)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(duì)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(jì)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(jìn)行極為詳細(xì)的浮游有孔蟲生物地層學(xué)的研究,共鑒定出浮游有孔蟲25屬121種,劃分出7個(gè)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(duì)古魯浦剖面中浮游有孔蟲的研究,認(rèn)為研究區(qū)內(nèi)遮普惹組砂巖頁(yè)段頂部沉積時(shí)代可達(dá)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(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】：2015
【分類號(hào)】：Q915

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本文編號(hào)：1507721