【摘要】：位于青藏高原東北緣的祁連山由一系列平行的山系及其山間盆地相間組成,其新生代山體隆升與盆地演化是關(guān)系到青藏高原隆升擴(kuò)展乃至中國(guó)一二級(jí)階梯地勢(shì)形成的關(guān)鍵問題.本文以祁連山腹地及外圍新生代沉積盆地為研究對(duì)象,綜合考慮區(qū)域位置、盆地形成與演化等要素,基于不同盆地區(qū)域地層對(duì)比,進(jìn)行動(dòng)態(tài)地層區(qū)劃,進(jìn)而恢復(fù)祁連山地區(qū)構(gòu)造-沉積演化過程.結(jié)果表明,古近紀(jì)早期(古-始新世)祁連山地區(qū)為一隆起帶,南北兩側(cè)的柴達(dá)木盆地與酒泉盆地以及腹地蘭州-西寧盆地獨(dú)立演化;漸新世青藏高原隆升并向東北方向擴(kuò)張逆沖,西秦嶺北緣貴德-西寧-蘭州-臨夏壓陷盆地形成,祁連山東部地區(qū)壓陷盆地全面接受沉積,祁連山西部地區(qū)的南祁連古隆起與北祁連古隆起之間蘇里盆地開始形成并接受沉積.中新世祁連山地區(qū)陸內(nèi)擠壓造山與盆地裂解,拉脊山、青海南山、積石山、六盤山等山體相繼隆起,將古近紀(jì)統(tǒng)一大型壓陷盆地分割為貴德、共和、青海湖、西寧、蘭州、臨夏及天水等盆地,分別歸屬新近紀(jì)貴德-西寧-蘭州地層區(qū)中各地層分區(qū),疏勒南山隆起將蘇里盆地裂解為多個(gè)小盆地,同歸新近紀(jì)蘇里地層區(qū).與此同時(shí),南、北祁連開始向外逆沖擴(kuò)展,柴達(dá)木盆地與酒泉盆地范圍較古近紀(jì)縮小,且在盆地邊緣形成次一級(jí)沉降中心,分屬新近紀(jì)柴達(dá)木地層區(qū)和肅北-酒泉地層區(qū).
[Abstract]:The Qilian Mountains, located in the northeastern margin of the Qinghai-Tibet Plateau, consist of a series of parallel mountain systems and their intermountain basins. The Cenozoic uplift and basin evolution are the key problems related to the uplift and extension of the Qinghai-Tibet Plateau and the formation of the first and second steps of China's stepped topography. Taking the Cenozoic sedimentary basins in the hinterland and periphery of Qilian Mountains as the research object, the dynamic stratigraphic regionalization is carried out based on the regional stratigraphic correlation of different basins, considering the regional location, formation and evolution of the basins, and so on. Then the tectonic-sedimentary evolution process in Qilian Mountain area was restored. The results show that the early Paleogene (Paleo-Eocene) Qilian Mountains area is a uplift belt with the Qaidam basin and Jiuquan basin on both sides of the north and south and the Lanzhou Xining basin in the hinterland independently evolving. The Oligocene Qinghai-Xizang Plateau uplifted and thrust northeast, the Guide-Xining Lanzhou Linxia depression basin was formed in the northern margin of the West Qinling Mountains, and the depression basin in the eastern part of the Qilian Mountains accepted the deposits. The Su Li basin between the South Qilian paleouplift and the North Qilian paleouplift in the western Qilian Mountains began to form and accept the deposits. In the Miocene Qilian Mountains, the intracontinental compressional orogeny and basin splitting, the Laki Mountains, the Southern Qinghai Mountains, the Jishi Mountains and the Liupan Mountains have been uplifted one after another, dividing the Paleogene unified large depression basins into Guide, Gonghe, Qinghai Lake, Xining and Lanzhou. Linxia and Tianshui basins belong to the stratigraphic zones of the Neogene Jigui De-Xining Lanzhou stratigraphic area respectively. The uplift of Sunan Mountain splits Su Li basin into several small basins and belongs to the Neogene Gisuri stratigraphic area. At the same time, the south and north Qilian began to extend outward thrust, the range of Qaidam basin and Jiuquan basin was smaller than that of Paleogene, and the secondary subsidence center was formed in the margin of the basin, belonging to the Neogene Qaidam stratigraphic area and Subei Jiuquan stratigraphic area.
【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;國(guó)土資源部巖漿作用成礦與找礦重點(diǎn)實(shí)驗(yàn)室中國(guó)地質(zhì)調(diào)查局西安地質(zhì)調(diào)查中心;
【基金】：中國(guó)地質(zhì)調(diào)查局工作項(xiàng)目(編號(hào):DD20160345-16) 國(guó)家自然科學(xué)基金項(xiàng)目(批準(zhǔn)號(hào):40382039,41372020,41372036,41472035)資助
【分類號(hào)】：P534.6;P542

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