川西新元古代苏雄组层型剖面SHRIMP锆石U-Pb年龄及其地质意义
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摘要
对采自川西新元古代苏雄组层型剖面中上部的英安岩进行SHRIMP锆石U-Pb定年,获得了两组谐和年龄值:838±9 Ma(n=9,MSWD=0.80)和780±12Ma(n=5,MSWD=1.2)。其中780±12 Ma解释为苏雄组英安岩的喷发时限,代表康滇裂谷盆地强烈扩张时期的构造岩浆热事件;而838±9 Ma则可能代表康滇裂谷盆地开启前的构造岩浆热事件。综合研究认为,苏雄组位于康滇裂谷半地堑盆地的调节带,为华南新元古代幕式岩浆活动的产物;火山活动和沉积记录均表明,扬子周缘发育与地幔柱相关的裂谷盆地系统,且华南可能是Rodinia超大陆裂解的重要组成单元。
Objectives:The age and tectonic setting of extensive Neoproterozoic volcanic activities around the margin of Yangtze Block were of great significance for reconstructing the position of South China Block in the Rodinia supercontinent.At present,only a few precise ages were obtained from the volcaniclastics of Suxiong Formation in the western margin of Yangtze Block.Therefore,a dacite sample for the stratoype section was collected from Suxiong Formation,with the purpose of determinating the high-precise age in western Sichuan province.Methods:The zircon SHRIMP U-Pb analysis was used to determinate the age of the dacite sample from the Suxiong Formation,which was carried out by SHRIMP Ⅱ in Beijing SHRIMP Center,Chinese Academy of Geological Sciences.Results:Two precise ages of 838 ± 9 Ma and 780 ± 12 Ma were obtained.Conclusions:Among them,the younger one,780 ±12 Ma,was interpreted as the eruption age of the dacite sample,which could represented the tectonic—magma event of the Kangdian rift basin during the period of strong extension,and the older one,838 ± 9 Ma,represented the tectonic—magma event before the opening of the Kangdian rift basin.Through the comprehensive analysis,the Suxiong Formation was regarded as the product of episodic magmatic activity,locating at the accommodation zones of the Kangdian half graben.Consequently,a series of rift basins,which were related to the mantle plume that led to the breakup of Rodinia supercontinent,should be developed around the margin of Yangtze Block,while the South China Block could be a member of Rodinia supercontinent breakup,through the analysis of volcanic activities and sedimentary records.
Objectives:The age and tectonic setting of extensive Neoproterozoic volcanic activities around the margin of Yangtze Block were of great significance for reconstructing the position of South China Block in the Rodinia supercontinent.At present,only a few precise ages were obtained from the volcaniclastics of Suxiong Formation in the western margin of Yangtze Block.Therefore,a dacite sample for the stratoype section was collected from Suxiong Formation,with the purpose of determinating the high-precise age in western Sichuan province.Methods:The zircon SHRIMP U-Pb analysis was used to determinate the age of the dacite sample from the Suxiong Formation,which was carried out by SHRIMP Ⅱ in Beijing SHRIMP Center,Chinese Academy of Geological Sciences.Results:Two precise ages of 838 ± 9 Ma and 780 ± 12 Ma were obtained.Conclusions:Among them,the younger one,780 ±12 Ma,was interpreted as the eruption age of the dacite sample,which could represented the tectonic—magma event of the Kangdian rift basin during the period of strong extension,and the older one,838 ± 9 Ma,represented the tectonic—magma event before the opening of the Kangdian rift basin.Through the comprehensive analysis,the Suxiong Formation was regarded as the product of episodic magmatic activity,locating at the accommodation zones of the Kangdian half graben.Consequently,a series of rift basins,which were related to the mantle plume that led to the breakup of Rodinia supercontinent,should be developed around the margin of Yangtze Block,while the South China Block could be a member of Rodinia supercontinent breakup,through the analysis of volcanic activities and sedimentary records.
引文
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