Early cretaceous granitoids and their implications for the collapse of the Dabie orogen, eastern China: SHRIMP zircon U-Pb dating and geochemistry
文献类型：期刊论文
| 作者 | Xu, Haijin; Ma, Changqian; Ye, Kai |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2007-06-15 |
| 卷号 | 240期号:3-4页码:238-259 |
| 关键词 | early Cretaceous granitoids extensional collapse the Dabie orogen |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2007.02.018 |
| 文献子类 | Review |
| 英文摘要 | Two stages of early Cretaceous post-orogenic granitoids are recognized in the Dabie orogen, eastern China, which recorded processes of extensional collapse of the orogen. The early stage granitoids (similar to 132 Ma) are foliated hornblende quartz monzonites and porphyritic monzogranites. They are of high-K calc-alkaline series and metaluminous to weakly peraluminous, with high KO and low MgO contents (Mg-# values: 32.0-46.0), they contain high Sr, low Y and heavy rare earth elements (HREE), and have high Sr/Y and (La/Yb)(N) ratios, without clear negative Eu, Sr and Ti anomalies. The early stage deformed granitoids have adakitic geochemical compositions and are equilibrated with residues rich in garnet and poor in anorthite-rich plagioclase, and thus indicate the existence of an over-thickened (>50 km) crustal root beneath the orogen at similar to 132 Ma. The later stage granitoids (similar to 128 Ma) are undeformed fine-grained monzogranites, fine-grained K-feldspar granites and coarse-grained K-feldspar granite-porphyry. They belong to a peraluminous and high-K calc-alkaline to shoshonite series, and display a flat HREE pattern and have strong negative Eu, Sr and Ti anomalies, with low Sr/Y and (La/Yb)N ratios. The late stage granitoids are equilibrated with residues rich in anorthite-rich plagioclase, hornblende, ilmenite/titanite and poor in garnet, indicating that the crust of the Dabie orogen became thinner (<35 km) at similar to 128 Ma. SHRIMP zircon U-Pb ages and changing compositional trends for these two stages of granitoids indicate that the over-thickened crust formed by the Triassic continental subduction/collision under the Dabie orogen remained until the early Cretaceous, and collapsed quickly in a few million years during the early Cretaceous. (C) 2007 Elsevier B.V. All rights reserved. |
| WOS关键词 | LOWER CONTINENTAL-CRUST ; PRESSURE METAMORPHIC TERRANE ; MAFIC-ULTRAMAFIC INTRUSIONS ; UNDERPLATED BASALTIC CRUST ; CORE COMPLEX-FORMATION ; TRANS-HUDSON OROGEN ; ISOTOPE EVIDENCE ; SOUTHERN TIBET ; IGNEOUS ROCKS ; LITHOSPHERIC MANTLE |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000247057700004 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67820]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Ye, Kai |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Haijin,Ma, Changqian,Ye, Kai. Early cretaceous granitoids and their implications for the collapse of the Dabie orogen, eastern China: SHRIMP zircon U-Pb dating and geochemistry[J]. CHEMICAL GEOLOGY,2007,240(3-4):238-259. |
| APA | Xu, Haijin,Ma, Changqian,&Ye, Kai.(2007).Early cretaceous granitoids and their implications for the collapse of the Dabie orogen, eastern China: SHRIMP zircon U-Pb dating and geochemistry.CHEMICAL GEOLOGY,240(3-4),238-259. |
| MLA | Xu, Haijin,et al."Early cretaceous granitoids and their implications for the collapse of the Dabie orogen, eastern China: SHRIMP zircon U-Pb dating and geochemistry".CHEMICAL GEOLOGY 240.3-4(2007):238-259. |
入库方式： OAI收割
来源：地质与地球物理研究所
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