【摘要】：巴基斯坦鹽嶺地區(qū)位于印度板塊北部,與其北部的波特瓦爾盆地一同接受了新生代早期沉積。區(qū)內(nèi)自古新世和始新世的濱海相-海相沉積起,經(jīng)漸新世抬升剝蝕,中新世以來(lái)轉(zhuǎn)為陸相前陸沉積,沉積了巨厚層河流-沖積相碎屑巖,至更新世后期開(kāi)始逆沖成山,而其北部波特瓦爾盆地相應(yīng)地進(jìn)入破裂前陸盆地演化期,在其南部形成新的前陸沉積區(qū)。鹽嶺新生代演化過(guò)程中兩個(gè)關(guān)鍵時(shí)間點(diǎn)分別為漸新世末和上新世末,前者完成了沉積環(huán)境由洋到陸的轉(zhuǎn)變,后者使鹽嶺隆升成山,改變了區(qū)域構(gòu)造格局,這兩個(gè)時(shí)間點(diǎn)對(duì)應(yīng)喜馬拉雅運(yùn)動(dòng)Ⅰ幕和Ⅱ幕。鹽嶺東部地區(qū)新生代的演化與印度-歐亞板塊的俯沖-碰撞息息相關(guān),且在演化的關(guān)鍵時(shí)間點(diǎn)上密切呼應(yīng),其新生代演化過(guò)程對(duì)我國(guó)青藏高原隆升意義重大。
[Abstract]:The Salt Ridge region of Pakistan, located in the northern part of the Indian Plate, received early Cenozoic deposits along with the Bolvar Basin in the north. Since Paleocene and Eocene, the littoral facies and marine facies have been deposited in the area, after the Oligocene uplift and denudation, they have been converted into continental Foreland deposits since the Miocene, and have deposited huge thick fluvial alluvial clastic rocks, which began to thrust into mountains during the late Pleistocene. The northern Bolvar basin correspondingly entered the evolution period of the fractured Foreland basin and formed a new Foreland sedimentary area in the southern part of the basin. The two key time points in the Cenozoic evolution of Yanling are the end of Oligocene and the end of Pliocene. The former has completed the transition of sedimentary environment from ocean to land, and the latter has made the Yanling uplift into a mountain and changed the regional tectonic pattern. These two time points correspond to the Himalayan movement acts I and II. The evolution of the Cenozoic in the eastern Yanling area is closely related to the subduction and collision of the Indo-Eurasian plate and is closely echoed at the critical time point of evolution. The Cenozoic evolution process is of great significance to the uplift of the Qinghai-Xizang Plateau in China.
【作者單位】： 西北大學(xué)地質(zhì)學(xué)系大陸動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)煤炭地質(zhì)總局航測(cè)遙感局;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41330315,91214301,90814005) 西北大學(xué)大陸動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室科學(xué)技術(shù)部專項(xiàng)
【分類號(hào)】：P542
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本文編號(hào)：2429727