کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9528982 | 1637786 | 2005 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Os isotope systematics in Fogo Island: Evidence for lower continental crust fragments under the Cape Verde Southern Islands
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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چکیده انگلیسی
As with Pb, Sr and He, the Os and Nd isotopic compositions of the moderate HIMU end-member are explained by the mixing of 1.6 Ga recycled oceanic crust (ROC) and lower mantle material (LM) and interpreted to represent the Cape Verde mantle plume expression. For the EM1-like end-member, the high 187Os / 188Os ratios that are measured in mafic lavas preclude the sub-continental lithospheric mantle from being its origin, as previously proposed based on trace element and Pb, Sr and Nd isotopic compositions. Our new isotopic and trace element data still indicate that the enriched component is related to continental lithospheric material incorporated in the oceanic lithosphere during the opening of the Atlantic Ocean but requires the involvement of lower continental crust fragments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 219, Issues 1â4, 15 June 2005, Pages 93-113
Journal: Chemical Geology - Volume 219, Issues 1â4, 15 June 2005, Pages 93-113
نویسندگان
Stéphane Escrig, Régis Doucelance, Manuel Moreira, Claude Jean Allègre,