本文選題：東昆侖南坡俯沖增生雜巖　切入點：奧陶紀—志留紀　出處：《地質(zhì)通報》2017年Z1期

【摘要】：東昆侖的形成經(jīng)歷了長期的構(gòu)造演化、地體拼貼、碰撞及復合造山的動力過程。奧陶紀—志留紀昆中洋由南向北俯沖形成典型的東昆侖南坡俯沖增生雜巖楔,其中發(fā)育的納赤臺群物質(zhì)組成復雜,也是該帶主要的組成物質(zhì)。通過野外詳細調(diào)查,發(fā)現(xiàn)納赤臺群物質(zhì)由洋中脊-洋島環(huán)境下的含蛇綠巖殘片組分及遠洋泥鈣質(zhì)沉積、具有濁積巖特征的大陸斜坡次深海-深海相物質(zhì)、前陸盆地復理石沉積組合、火山島弧環(huán)境下的物質(zhì)組合等構(gòu)成。不同巖石組合間多為斷層后韌性剪切接觸,巖石構(gòu)造變形十分強烈,不同巖塊間時代跨度大,所處的構(gòu)造環(huán)境迥異。在長期俯沖過程中,將不同的物質(zhì)在東昆侖陸塊邊緣以不同規(guī)模,形態(tài)各異的巖片、巖塊樣式拼貼或堆垛在一起。
[Abstract]:The formation of East Kunlun has undergone a long period of tectonic evolution, orogenic collage, collision and composite orogeny. The Ordovicic-Silurian mid-Kun Ocean subducted from south to north to form a typical subduction and accretive complex wedge on the southern slope of East Kunlun. The material composition of the developed Nachitai group is complex, and it is also the main component of the belt. Through the detailed field investigation, it is found that the material of the Nachitai group is composed of ophiolite fragments and pelagic mudstone calcareous deposits in the mid-oceanic ridge-oceanic island environment. The subdeep-sea and deep-sea facies material of continental slope with turbidite characteristics, the assemblage of tectonite deposits in Foreland basin, and the material assemblage in volcanic island arc environment are all composed of subdeep-sea and deep-sea facies, and most of the different rock assemblages are post-fault ductile shear contact. The tectonic deformation of rock is very strong, the age span of different rock masses is large, and the tectonic environment is very different. In the long term subduction process, different materials are divided into different scales and different shapes at the edge of the East Kunlun land block. Pieces of rock form collage or stacking together.
【作者單位】： 青海省地質(zhì)調(diào)查局;青海省地質(zhì)調(diào)查院;
【基金】：中國地質(zhì)調(diào)查局項目《青海1∶25萬布倫臺、大灶火幅區(qū)調(diào)修測》(編號:1212011121187)
【分類號】：P587

【參考文獻】

相關(guān)期刊論文 前4條

1 倪晉宇;胡道功;周春景;;東昆侖造山帶納赤臺群形成的大地構(gòu)造環(huán)境探討[J];地質(zhì)力學學報;2010年01期

2 張耀玲;張緒教;胡道功;石玉若;陸露;;東昆侖造山帶納赤臺群流紋巖SHRIMP鋯石U-Pb年齡[J];地質(zhì)力學學報;2010年01期

3 劉照祥;彭耀全;;對納赤臺群的新認識[J];中國區(qū)域地質(zhì);1984年02期

4 李光岑;林寶玉;;昆侖山東段幾個地質(zhì)問題的探討[J];青藏高原地質(zhì)文集;1982年03期

【共引文獻】

相關(guān)期刊論文 前10條

1 裴磊;李瑞保;裴先治;劉俊來;李佐臣;劉成軍;陳有p，

本文編號：1667282