祁漫塔格造山帶——青藏高原北部地殼演化窺探
[Abstract]:Qimantag is a branch of the East Kunlun orogenic belt, located in the central and northern part of the Qinghai-Tibet Plateau, located between the Qaidam basin and the Kumukuli basin, and is located westward by the fault of the Altyn strike slip fault. From Proterozoic to early Mesozoic, the collision collage and continental accretion occurred between different terraces due to the influence of multi-stage and multi-stage ocean subduction and closure, and caused a series of magmatic events. The development of Neoproterozoic granites (1000 ~ 820 Ma) in the Qimantage orogenic belt is a response to the formation of the Rodinia supercontinent. The Ardatan and Baigan Lake thrust faults are divided into south and north Qimantag bodies. As the active continental margin, the North Qimantag terrane developed a large number of early Paleozoic subduction-related granite and VA ophiolite. The South Qimantage terrane was originally a primitive oceanic island arc formed by subduction of the ocean, and developed early Paleozoic SSZ ophiolite, island arc tholeiite and calc-alkaline volcanic rocks. With continuous subduction, young island arcs are accompanied by crustal thickening to mature island arcs. The collision between the South and North Qimantag terrains (arc-continent collision) may take place in the late Silurian (422Ma) and last until the early Devonian (398Ma). During this period (422~389Ma) a series of concollision granites were developed in the South Qimantag and a series of oceanic island arc granites were developed in the North Qimantag. South Qimantag as an alien terrane, collision collage is of great significance to continental margin and continental accretion. Later, the south and north Qimantag terrains entered the post-collision environment and developed a series of intra-plate granites. In addition, the extension caused the orogenic belt to collapse, and the developing Devonian molded rock formation. The collision caused the trench to recede and the blocking of the trench led to the weakening or even stopping of the subduction resulting in a gap in Carboniferous Permian magmatic activity. The final closure of the PaleoTethys Qimantag Ocean may have started in the late Permian, which led to the collage of the Kumukuri microplate on the continental margin, and the collision uplift resulted in the absence of the Upper Permian and Middle Triassic strata. In the early Middle Triassic (251C 237 Ma), the subduction oceanic plate rotated due to collision, then broke off, and the asthenospheric mantle material upwelled along the lithospheric mantle channel, which led to the partial melting of the new lower crust. By the late Triassic, large scale lithospheric mantle and lower crust materials desunk, resulting in the melting of ancient crustal materials and the formation of a series of calc-alkaline and alkaline granites in the background of post-collision.
【作者單位】: 中國地質(zhì)科學院礦產(chǎn)資源研究所國土資源部成礦作用與資源評價重點實驗室;北京大學地球與空間科學學院;中國地質(zhì)調(diào)查局西安地質(zhì)調(diào)查中心;青海省第三地質(zhì)礦產(chǎn)勘查院;長安大學地球科學與資源學院;
【基金】:國土資源部公益性行業(yè)科研專項經(jīng)費項目(編號:201411025) 中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項目(編號:1212011085528);中國地質(zhì)調(diào)查局高層次地質(zhì)人才培養(yǎng)計劃(編號:201309) 青年地質(zhì)英才計劃(編號:201112)資助的成果
【分類號】:P313
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