Forming Age of the Volcanic Rocks of the Yaolinghe Group from Wudang Block,Southern Qinling Mountain:Constraint from Grain-Zircon U-Pb Dating
Forming Age of the Volcanic Rocks of the Yaolinghe Group from Wudang Block,Southern Qinling Mountain:Constraint from Grain-Zircon U-Pb Dating
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发表时间：
2007
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通讯作者：
Cai Zhiyong
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作者：
Cai Zhiyong
南秦岭武当地块腰岭河群火山岩的形成时代一般认为在700 ~ 1000 Ma之间，其成因与Rodinia超大陆的演化密切相关。本文从腰岭河群火山岩中采集了13个锆石颗粒，经U-Pb年龄测定，火山岩的年龄为632±1 Ma，其中以1000 ~ 1000 Ma的年龄最大。作者认为，锆石U-Pb测年结果是可信的，632± 1 Ma应代表耀岭河群火山岩的形成年龄，因此，颗粒锆石U-铅定年结果表明，耀岭河群火山岩形成于晚震旦世，对研究其地质意义具有一定的参考价值可能影响到有关秦岭带Rodinia超大陆分裂的一些观点。
The forming age of volcanic rocks of the Yaolinghe Group from Wudang block,Southern Qinling Mountain was previously thought to be between 700 and 1000 Ma and its origin is closely related with the evolution of the supercontinent Rodinia in common.We collected 13 zircon grains from the volcanic rocks of the Yaolinghe Group.U-Pb dating of these grain zircons shows that the age of the volcanic rocks is 632±1 Ma,indicating a difference from the age previously suggested.The authors argue that the zircon U-Pb dating result is credible and the 632±1Ma should represent the forming age of the volcanic rocks of the Yaolinghe Group.Hence,the grain-zircon U-Pb dating constrains the volcanic rocks of the Yaolinghe Group to be formed during the late Sinian Period.This study may have certain reference value to study the geological meanings of the volcanic rocks of the Yaolinghe Group,and may influence some standpoints about Rodinia super continent split in Qinlin belt.