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《Scientia Geologica Sinica》 2001-02
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CONSTRAINTS OF GEOLOGY AND GEOCHEMISTRY ON PALEOPROTEROZOIC PRE-OROGENIC DEEP PROCESSES IN JIAO-LIAO MASSIF

Li Sanzhong\ Han Zongzhu (Ocean University of Qingdao, Qingdao\ 266003) Liu Yongjiang\ Yang Zhensheng (College of Earth Sciences, Jilin University, Changchun\ 130061)  
Systematic analyses of geology and geochemistry revealed that the Paleoproterozoic pre\|orogenic deep processes in the Jiao\|Liao Massif might be mainly magma underplating, which was characterized with episodic activities, asymmetric patterns and southward tectonic migration. To be controlled by this deep process occurred the mafic magma emplacement yielding an age about 2.4 Ga, the bimodal volcanism of rift\|type during 2.4 Ga to 1.9 Ga, and emplacement of the large monzogranitic magma during 2.2 Ga to 1.9 Ga. The emplacement of monzogranite triggered bedding\|parallel sliding deformation of the sedimentary cover during 2.2 Ga to 1.9 Ga, which was accompanied with the pegmatitic veins of lit\|par\|lit injection, the lower\|pressure and higher\|temperature metamorphism, and the vertical bedding\|parallel progressive metamorphism (a special metamorphic phenomenon related to extension).
【Fund】: 国家自然科学基金!项目 (编号 :4 0 0 0 2 0 1 5)成果之一
【CateGory Index】: P542;P59
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