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Purpose: To improve the production of a novel exopolysaccharide (EPS)

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Continentsontinent collision is the most important driving mechanism for the occurrence of various geological processes in the continental lithosphere. How to recognize and determine continent-continent collision. especially its fourdimensional temporal-spatial evolution, is a subject that geological communities have long been concerned about and studied, Continent-continent collision is mainly manifested by strong underthrusting (subduction) of the underlying block along an intracontinental subduction zone and continuous obduction (thrusting propagation) of the overlying block along the intracontinental subduction zone, the occurrence of a basin-range tectonic framework in a direction perpendicular to the subduction zone and the flexure and disruption of the Moho. On the basis of numerical modeling, the authors discuss in detail the couplings between various amounts and rates of displacement caused by basin subsidence, mountain uplift and Moho updoming and downflexure during obduction (thrusting propagation) and subduction and the migration pattern of basin centers. They are probably indications or criteria for judgment or determination of continent-continent collision. 2 Calculated Initial Model and RemeshingRemeshing is based on the conventional crustal structure model (Wu et al., 1989;Ding, 1991; Yuan, 1996;Wang et al., 1997;Teng et al., 1999). the 35 km thick crust above the Moho is divided into the upper, middle and lower layers, namely, an 8 km thick sedimentary cover (the upper layer of the upper crust), a 12 km thick granitic layer (the lower layer of the upper crust) and a 15 km thick basaltic layer (the lower crust). The number of the initial elements of the remeshing is 12 and the number of the nodes is 20. On calculation, the actual number of the elements is 468 and the total number of the nodes is 520. , 2002. GPS velocity field and active crustal deformation in and around the Qinghai-%bet Plateau. Earth Science Frontiers, 9(2): 442450 (in Chinese with English abstract). 69-80.