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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2003-05
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IDENTIFICATION OF ADAKITE-LIKE ROCKS IN THE MIDDLE JURASSIC VOLCANIC ROCKS FROM HAIFANGGOU FORMATION IN WEST LIAONING AREA AND ITS GEOLOGICAL SIGNIFICANCE

WU Guang1,2, LI Zhongquan3, LI Zhitong2(1.College of Earth Sciences, Jilin University, Changchun, China;2.Shenyang Institute of Geology and Mineral Resources, CGS, China;hengdu University of Technology, China)  
In West Liaoning of northeast China, the Middle Jurassic volcanic rocks of Haifanggou Formation are important members of the Mesozoic rocks, which consist of trachyandesiteandesitedacitetrachydacite. The volcanic rocks belong to highK calcalkaline and calcalkaline series. By studing the major elements in volcanic rocks, rare earth elements and trace elements, the authors found that the volcanic rocks of Haifanggou Formation have similar petrography and geochemical characteristics to adakite. They are recognized as adakitelike rocks. The volcanic rocks were derived from the partial melting of ancient basaltic rocks in the lower crust, and the depth of volcanic sourcerocks is very large. The identification of adakitelike rocks in Haifanggou Formation have an important geological significance in discussing magma derivation, crustmantle process, the obvious transformation of Mesozoic tectonic stress field and formation of a plentiful of fault basins in West Liaoning, northeast China.
【Fund】: 辽河石油勘探局基础研究项目(LYK19930622-01)
【CateGory Index】: P588.14
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