Dating of prograde metamorphic events deciphered from episodic zircon;growth in rocks of the Dabie-Sulu UHP complex, China | |
Liu, Dunyi4; Jian, Ping; Kroener, Alfred; Xu, Shutong | |
刊名 | EARTH AND PLANETARY SCIENCE LETTERS
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2006 | |
卷号 | 250期号:3-4页码:650-666 |
关键词 | Dabie-Sulu SHRIMP eclogite and peridotite zircon UHP metamorphism |
ISSN号 | 0012-821X |
DOI | 10.1016/j.epsl.2006.07.043 |
英文摘要 | The timing of ultra-high pressure (UHP) metamorphism has been difficult to determine because of a lack of age constraints on crucial events, especially those occurring on the prograde path. New Sensitive High-Resolution Ion Microprobe (SHRIMP) U-Pb age and rare-earth element (REE) data of zircon are presented for UHP metamorphic rocks (eclogite, garnet peridotite, garnet pyroxenite, jadeite quartzite and garnet gneiss) along the Dabie-Sulu UHP complex of China. With multiphase metamorphic textures and index mineral inclusions within zircon, the Dabie data define three episodes of eclogite-facies metamorphism, best estimated at 242.1 +/- 0.4 Ma, 227.2 +/- 0.8 Ma and 219.8 +/- 0.8 Ma. Eclogite-facies zircons of the Sulu UHP complex grew during two major episodes at 242.7 +/- 1.2 and 227.5 +/- 1.3 Ma, which are indistinguishable from corresponding events in the Dabie UHP complex. A pre-eclogite metamorphic phase at 244.0 +/- 2.6 Ma was obtained from two Sulu zircon samples which contain low pressure-temperature (plagioclase, stable below the quartz/Ab transformation) and hydrous (e.g., amphibole, stable below similar to 2.5 Gpa) mineral inclusions. In terms of Fe-Mg exchange of trapped garnet-clinopyroxene pairs within zircon domains, we are able to determine the Pressure-Temperature (PT) conditions for a specific episode of metamorphic zircon growth. We suggest that mineral phase transformations and associated dehydration led to episodic eclogite-facies zircon growth during UHP metamorphism (similar to 2.7 Gpa) began at 242.2 +/- 0.4 Ma (n = 74, pooling the Dabie-Sulu data), followed by peak UHP metamorphism (> similar to 4 Gpa) at 227.3 +/- 0.7 Ma (n=72), before exhumation ( |
学科主题 | 变质岩岩石学 |
WOS关键词 | ULTRAHIGH-PRESSURE METAMORPHISM ; EAST-CENTRAL CHINA ; U-PB ZIRCON ; COESITE-BEARING ECLOGITE ; WESTERN GNEISS REGION ; SM-ND AGES ; GARNET ; PERIDOTITE ; TECTONIC IMPLICATIONS ; MINERAL INCLUSIONS ; CONTINENTAL-CRUST |
WOS研究方向 | Geochemistry & Geophysics |
语种 | 英语 |
出版者 | ELSEVIER SCIENCE BV |
WOS记录号 | WOS:000242195100017 |
内容类型 | 期刊论文 |
源URL | [http://119.78.100.197/handle/2HKVOGP0/38207] ![]() |
专题 | 中国地质科学院地质研究所 |
作者单位 | 1.Chinese Acad Geol Sci, SHRIMP Unit, Inst Geol, Beijing 100037, Peoples R China. 2.Univ Mainz, Inst Geowissensch, D-55099 Mainz, Germany. 3.Anhui Inst Geol, Hefei 23001, Anhui, Peoples R China. 4.中国地质科学院地质研究所 |
推荐引用方式 GB/T 7714 | Liu, Dunyi,Jian, Ping,Kroener, Alfred,et al. Dating of prograde metamorphic events deciphered from episodic zircon;growth in rocks of the Dabie-Sulu UHP complex, China[J]. EARTH AND PLANETARY SCIENCE LETTERS,2006,250(3-4):650-666. |
APA | Liu, Dunyi,Jian, Ping,Kroener, Alfred,&Xu, Shutong.(2006).Dating of prograde metamorphic events deciphered from episodic zircon;growth in rocks of the Dabie-Sulu UHP complex, China.EARTH AND PLANETARY SCIENCE LETTERS,250(3-4),650-666. |
MLA | Liu, Dunyi,et al."Dating of prograde metamorphic events deciphered from episodic zircon;growth in rocks of the Dabie-Sulu UHP complex, China".EARTH AND PLANETARY SCIENCE LETTERS 250.3-4(2006):650-666. |
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