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Discovery of a New Middle Jurassic Dinosaur Site in Sichuan,China

Acta Geologica Sinica(English Edition) 2022年第1期96卷 52-60页

作者： HAO Baoqiao ZHANG Qiannan PENG Guangzhao YE Yong Institute of Deep Time Terrestrial Ecology Yunnan UniversityKunming 650091China Research Center of Jurassic Stratigraphy and Paleontology Zigong Dinosaur MuseumZigongSichuan 643013China Key Laboratory of Stratigraphy and Paleontology Ministry of Natural ResourcesBeijing 100050China Beijing Museum of Natural History Beijing 100050China

The Sichuan Basin,also known as the‘Red Basin’,is famous for its abundance of Mesozoic dinosaur fossils,especially in the Zigong area during the Jurassic era;the Middle Jurassic Shunosaurus and the Late Jurassic Mamenchisaurus faunal assemblages are the most *** qinglongshan dinosaur fossil site is located in Fuxing,to the northwest of Rong County,Zigong *** new site is situated within the Middle Jurassic Xiashaximiao Formation,and geologically is roughly equivalent to the well-known Dashanpu dinosaur fossil *** than 600 dinosaur fossils were found concentrated in the excavation area,including teeth;cervical,dorsal and caudal vertebrae;and various parts of appendicular *** fossil site is also most significant as it provides new information on non-avian dinosaur life during the poorly understood Middle Jurassic.

关键词： vertebrate paleontology Dinosauria Xiashaximiao Formation Middle Jurassic qinglongshan Sichuan Province

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SHRIMP Dating and Recrystallization of Metamorphic Zircons from a Granitic Gneiss in the Sulu UHP Terrane

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Acta Geologica Sinica(English Edition) 2004年第1期78卷 146-154页

作者： LI HongyanInstitute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037 Geosciences Rennes, Universite de Rennes 1, 35042 Rennes Cedex, France Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 Géosciences Rennes Université de Rennes 1 35042 Rennes Cedex France *Correspondence: LI Hongyan *Correspondence: E-mail: hyli@***

An unusual zircon SHRIMP dating result of a granitic gneiss from the qinglongshan eclogite-gneiss roadcut section is presented in this paper. The very peculiar and complicated internal structures, as well as the very low Th/U ratios (0.01-0.08) of the zircons indicate that they were formed by metamorphic recrystallization. Strongly in contrast with previously published zircon U-Pb ages of the Dabie-Sulu UHP metamorphic rocks where protolith ages of 600-800 Ma are commonly recorded, only metamorphic age of 218±5 Ma, defined by 18 analytical spots either in rim or in core of zircons, are recorded in this granitic gneiss. This age represents the time of the complete metamorphic recrystallization overprint on primary magmatic zircons. The recrystallization was derived by the UHP metamorphism, and was strengthened by the early stage of retrograde metamorphic fluid activity.

关键词： recrystallization of zkcon metamorphic fluid SHRIMP dating granitic gneiss qinglongshan Sulu China

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