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ON THE INDOSINIAN MOVEMENT OF CHINA’S PERI-PACIFIC TECTONIC BELT

Cui Shengqin;Li Jinrong Chinese Academy of Geological Sciences  
The indosinian Tectonism, which was proposed for the first time by Prof. T. K. Huangin 1945 to embrace tectonic movements ranging in age from Middle Triassic to Early Juras-sic. has a great significance in the tectonic evolution of peri-Pacific Belt within the territoryof China. The Geographical Distribution of the Indosinian Movement: In the past little atten-tion has been paid to the presence of tectonic movements of this stage in the North andNortheast China. The successive discovery of the fossiliferous Triassic strata, deformation,magmatism, and metamorphism of the Indosinian stage in Western Peri-Pacific TectonicBelt. The Indosinian Tectonism and Geological Processes: In the aspect of paleodeforma-tion, the Indosinian Movement is represented by folding associated with faulting; in theaspect of magmatic activity, represented by eruptions and intrusions of basic, alkaline andmostly intermediate to acidic rocks; in the aspect of metamorphism, it may comprise initialand superimpositional types; in the aspect of sedimentation, the Indosinian stage has pla-yed an important role in the evolution of paleogeographic environment; in the field of me-tallogenesis, the ore occurreces of this period in the particular regions exhibit some distinctcharacteristics. The Subdivision and Designation of the Indosinian Movement: On the basis of the pa-leogeographic and paleotectonic development, the Indosinian Tectonic Cycle may be divi-ded into the early stage (T_(1-2))and the late stage (T_3), two regional orogenic episodes(or main episodes) and some local orogenic episodes (or subordinate episodes). The Indo-sisian Orogeny served as a turning point in geological history for the Peri-Pacific TectonicBelt within the territory of China, with fundamental change in tectonic pattern taking placein it. It is a new stage of the tectonomagmatic development in these regions. In summary, theIndosinian Cycle may be regarded as the beginning of Meso-Cenozoic tectonic stage. Attached to the present paper are also some maps showing the paleodeformation of In-dosinian times, the relations of the magmatism and metamorphism to the Indosinian struc-tural deformation and the regional background of the Indosinian Tectonism.
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