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《Journal of Ocean University of Qingdao》 2001-01
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Tectonic lmplication and Metamorphism of Sanchazi Metagabbro from Mian Lue Suture Zone of Qinling Orogenic Belt

Li Sanzhong 1 Zhang Guowei 2 Li Yalin 2 Yao Anping 2(1 Ocean University of Qingdao, Qingdao, 266003)(2 Northwest University, Xi'an,710069 )  
In recent years, Mian Lue suture zone is revealed to represent a small ocean during the late Paleozoic existed in the Qinling orogen. This ophiolitic tectonic melange is composed of some complex slabs from different tectonic settings and structural levels, which underwent different metamorphism with different PTt paths and reworking. The PTt path study in this paper reveals that Sanchazi metagabbro from Mian Lue Suture zone of Qinling orogenic belt underwent two metamorphic and tectonic stages. The first is isothermal and fast decompressional metamorphism and uplifting of relict gabbro in the upper mantle under the extension setting. The subsequent stage is rapid cooling and slowly decompressional metamorphism. The early stage of metamorphism happened before deformation in the upper mantle at about 60 70km. Then metagabbro emplaced rapidly at about 40 km by diapirism and perhaps amalgamated with cool subducted oceanic crust. After that, rapid cooling retrograde metamorphism occurred. Early rapid ocean spreading was constrained because subduction appeared. Therefore, metagabbro continued to uplift under the slow extension. At last, it obducted and thrusted to outcrop on the surface. In addition, the metamorphic PTt path reflects that the thickness of oceanic crust of the Mian Lue small ocean is thinner than that of the standard oceanic crust.
【Fund】: 国家自然科学基金!重点项目 (4 9732 0 80 );; 青岛海洋大学青年教师基金
【CateGory Index】: P588.3
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