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The Late Mesozoic Granodiorites from the southwest Basin in the south china sea and Its tectonic implication

Journal of Earth Science 2012年第3期23卷 268-276页

作者：张振国杜远生高莲凤方念乔杨胜雄刘坚宋成兵 Faculty of Earth Sciences China University of Geosciences College of Mining Engineering Hebei United University Key Laboratory of Mineral Development and Security Technology of Hebei Province School of Ocean Sciences China University of Geosciences Guangzhou Marine Geological Survey of the Ministry of Land and Resources of china

The southwest basin is a key to study the origin and development of the south china sea（SCS）.We do not know much about its boundaries,geological history,and the formation of its sea floor because it has a complex and highly re-gional structural background,notable sediment activity,and yet few floor *** a grano-diorite sample was collected from the southern margin of the southwest basin of the south china *** results indicated that the 40ar-39ar ages of biotites in the sample are 110.3±0.5 Ma,suggesting that they were prod-ucts of magmatic intrusion during the Early Cretaceous *** sample＇s geochemistry showed it had high SiO2,K2O,and Al2O3 but low TiO2 *** discriminant diagrams suggested that the sample might represent extrusion-related magmatism,either in an arc or forearc setting in the SCS area and that the sample mainly belonged to the syncollision type,whose formation was related to *** sample may be part of the main rock that made up the boundaries of rift *** process of tension cracking was similar to the development of the Red sea,in which the rifting and sagging occurred in the continental *** southwest basin may not be an original ocean,but a rift developed through finite extension on continental crust *** oceanic crust came into being when the width and depth of the rift valley reached a certain *** granodiorite sample we collected provides a means of determining the boundary of the southwest basin and the clues that may help researchers expand relevant *** constitutes an important datum regarding the analysis of the formation and development of the SCS.

关键词： Late Mesozoic granodiorite the southwest basin the south china sea, ^40ar/^39ar age,tectonic implication.

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