Zircon SHRIMP U-Pb Dating and Lu-Hf Isotopic Composition for Early Cretaceous Plutonic Rocks in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:City w:st="on">Tengchong Block</st1:City>, <st1:State w:st="on">Southeastern</st1:State> <st1:country-region w:st="on">Tibet</st1:country-region></st1:place>, and Its Tectonic Implications

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Zircon SHRIMP U-Pb Dating and Lu-Hf Isotopic Composition for Early Cretaceous Plutonic Rocks in amespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />ace w:st="on">Tengchong Block, ate w:st="on">Southeasternate> Tibetace>, and Its Tectonic Implications

详细信息

责任者：Qi Xuexiang (State Key Laboratory of Continental Tectonics and Dynamics ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Zhu Luhua
刊名：Acta Petrologica Sinica
出版年：2011
卷期：27(11)
关键词：火成岩 ; igneous rocks ; 铀—铅计时 ; U-Pb dating ; 镥同位素 ; lutetium isotopes ; 铪同位素 ; hafnium isotopes ; 青藏高原 ; Qinghai-Tibetan Plateau
页码：p.3409-3421
图表：8 illus., 3 tables, 56 refs.
分类号：0801
issnNo：ISSN1000-0569
isbnNo：CN11-1922/P

摘要

AN id=EnChDivSummary name="EnDivSummary">The Early Cretaceous granodiorite and quartz monzonite are the main types of igneous rocks in Tengchong block. The characteristics of I-type plutonic rocks are shown by the mineral assemblages, and high Na₂O and low K₂O contents and A/CNK values. Zircon SHRIMP U-Pb dating show the granodiorite and quartz monzonite emplaced at (122±1.3) Ma and (125±1.3) Ma, respectively. The zircon εHf(t) values for granodiorite and quartz monzonite range from -9.6 to -4.8 (average -6.7±0.7) and -7.8 to -4.7 (average -6.3±0.6), with corresponding single-stage model ages ranging from 979 to 1 190 Ma and 975 to 1 113 Ma, respectively.

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