發(fā)布時(shí)間：2018-03-26 09:19

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

【摘要】：東昆侖的形成經(jīng)歷了長(zhǎng)期的構(gòu)造演化、地體拼貼、碰撞及復(fù)合造山的動(dòng)力過(guò)程。奧陶紀(jì)—志留紀(jì)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(tái)群物質(zhì)組成復(fù)雜,也是該帶主要的組成物質(zhì)。通過(guò)野外詳細(xì)調(diào)查,發(fā)現(xiàn)納赤臺(tái)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(yuǎn)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(fù)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(qiáng)烈,不同巖塊間時(shí)代跨度大,所處的構(gòu)造環(huán)境迥異。在長(zhǎng)期俯沖過(guò)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(guó)地質(zhì)調(diào)查局項(xiàng)目《青海1∶25萬(wàn)布倫臺(tái)、大灶火幅區(qū)調(diào)修測(cè)》(編號(hào):1212011121187)
【分類(lèi)號(hào)】：P587

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本文編號(hào)：1667282