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| An Important Spreading Event of the Neo-Tethys Ocean during the Late Jurassic and Early Cretaceous: Evidence from Zircon U-Pb SHRIMP Dating on Diabase in Nagarze, Southern Tibet | |
| 作者姓名： | JIANG Sihong NIE Fengjun HU Peng and LIU Yan Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing |
| 作者单位： | JIANG Sihong，NIE Fengjun，HU Peng and LIU Yan Institute of Mineral Resources，Chinese Academy of Geological Sciences，Beijing 100037 |
| 摘 要： | Widely distributed in Gyangze-Chigu area, southern Tibet, NW- and nearly E-W-trending diabase(gabbro)-gabbro diorite dykes are regarded as the product of the large-scale spreading of the late Neo-Tethys Ocean. In order to constrain the emplacement age of these dykes, zircons of two samples from diabases in Nagarze were dated by using the U-Pb SHRIMP method. Two nearly the same weighted mean 206Pb/238U ages were obtained in this paper, which are 134.9±1.8 Ma (MSWD= 0.65) and 135.5±2.1 Ma (MSWD=1.40), respectively. They not only represent the crystallization age of the diabase, but also documented an important spreading event of the Neo-Tethys Ocean during the late Jurassic and early Cretaceous. This dating result is of great significance to reconstruct the temporal framework of the late Neo-Tethys Ocean in the Qinghai-Tibet Plateau. |
An Important Spreading Event of the Neo-Tethys Ocean during the Late Jurassic and Early Cretaceous: Evidence from Zircon U-Pb SHRIMP Dating on Diabase in Nagarze, Southern Tibet |
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| Authors: | JIANG Sihong NIE Fengjun HU Peng and LIU Yan Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing |
| Abstract: | |
| Keywords: | diabase zircon U-Pb SHRIMP dating spreading event Neo-Tethys Nagarz(e) southern Tibet |
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