亚洲一区亚洲二区亚洲三区,国产成人高清在线,久久久精品成人免费看,999久久久免费精品国产牛牛,青草视频在线观看完整版,狠狠夜色午夜久久综合热91,日韩精品视频在线免费观看

SHRIMP U-Pb zircon dating for Qiashi

時間:2023-05-02 17:49:58 天文地理論文 我要投稿
  • 相關(guān)推薦

SHRIMP U-Pb zircon dating for Qiashikansayi granodiorite, the Northern Altyn Tagh Mountains and its geological implicati

The Qiashikansayi granodiorite is foliated resulting in a granodioritic gneiss. Its geochemical features, such as alumina saturation index(A/CNK) of 0.81-0.99, Na2O/K2O values>1, TiO2 contents <1.0%, LREE enrichment with high fractionation factors, weakly negative or no Eu anomalies, and significant Ba and Ti negative anomalies, suggest that it is similar to a typical island arc pluton. The trace elements of the Qiashikansayi granodiorite are plotted in the island arc field in the tectonic setting discrimination diagrams as well. Cathodoluminescence images demonstrated that the zircons have clear rhythmic crystallized zoning, without any remnant core and new crystallized rim, suggesting the zircons be magmatic ones. Their U and Th contents vary in the range of 574-870μg/g, and 279-556 μg/g respectively, with the Th/U ratio in the range of 0.52-0.68. SHRIMP zircon U-Pb dating yielded the 481.5(5.3 Ma age for the intrusion of the granodiorite, which is coeval with the island arc volcanic rocks in the northern Qilian Mountain, and confirms that there is an early Paleozoic island arc in the Hongliugou- Lapeiquan area.

作 者: QI XueXiang LI Haibing WU Cailai YANG Jingsui ZHANG Jianxin MENG Fancong SHI Rendeng CHEN Songyong   作者單位: Laboratory of Continental Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China  刊 名: 科學(xué)通報(英文版)  SCI 英文刊名: CHINESE SCIENCE BULLETIN  年,卷(期): 2005 50(5)  分類號:   關(guān)鍵詞: northern Altyn Tagh mountains   granodiorite   island arc   SHRIMP U-Pb zircon dating  

【SHRIMP U-Pb zircon dating for Qiashi】相關(guān)文章:

SHRIMP U-Pb zircon dating for lamprophyre from Liaodong Peninsula: Constraints on the initial time of Mesozoic lithosphe04-27

Mineral inclusions in zircon domains and geological significance of SHRIMP U-Pb dating for coesite-bearing zircons of pa04-29

Zircon SHRIMP Dating for the Weiya Pluton, Eastern Tianshan: Its Geological Implications04-29

Zircon SHRIMP Dating for the Weiya Pluton, Eastern Tianshan: Its Geological Implications04-29

U-Pb dating of zircon from the bed parallel anatectic granitic intrusion in the Baoban group in Hainan Island and the te04-26

SHRIMP U-Pb zircon ages for the UHP metamorphosed granitoid gneiss in Altyn Tagh and their geological signifi-cance04-29

U-Pb zircon age for the Nanhua-Sinian boundary04-29

湖南印支期花崗巖SHRIMP鋯石U-Pb年齡及其成因啟示04-28

塔里木西南緣和田布雅花崗巖鋯石SHRIMP U-Pb年齡及地質(zhì)意義04-28

海南島變碎屑沉積巖鋯石SHRIMP U-Pb年齡及地質(zhì)意義04-29