کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4717409 | 1638745 | 2009 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Geochemistry and Sm-Nd and Rb-Sr isotopic composition of eclogite in the Lhasa terrane, Tibet, and its geological significance
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Geochemistry and Sm-Nd and Rb-Sr isotopic composition of eclogite in the Lhasa terrane, Tibet, and its geological significance Geochemistry and Sm-Nd and Rb-Sr isotopic composition of eclogite in the Lhasa terrane, Tibet, and its geological significance](/preview/png/4717409.png)
چکیده انگلیسی
A new occurrence of eclogite has been discovered in the Lhasa terrane, northeast of Lhasa, Tibet along the northern margin of the Gangdese magmatic arc. The eclogite occurs as a 500-1000 m-wide belt that extends over 60 km in an E-W direction, and consists of coarse-grained, massive, rutile eclogite, quartz eclogite and phengite eclogite. Whole-rock geochemistry and relatively high εNd(t) for the eclogites suggest that their protoliths were low-K oceanic tholeiites, similar to typical N-MORB, derived from a depleted mantle source. However, all analyzed samples have negative Nb anomalies in MORB-normalized trace element patterns suggesting a suprasubduction zone influence. Zircon SHRIMP U-Pb ages of the eclogite ranging from 242 ± 15 Ma to 291 ± 13 Ma are interpreted as the age of peak metamorphism. a Sm-Nd isochron age of 306 ± 50 Ma (2Ï) likely reflects the protolith age. These data suggest that the Paleo-Tethyan ocean existed along the northern margin of the Gangdese island arc until the early Permian.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Lithos - Volume 109, Issues 3â4, May 2009, Pages 240-247
Journal: Lithos - Volume 109, Issues 3â4, May 2009, Pages 240-247
نویسندگان
Zhaoli Li, Jingsui Yang, Zhiqin Xu, Tianfu Li, Xiangzhen Xu, Yufeng Ren, Paul T. Robinson,