کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9451115 | 1307364 | 2005 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Geochemical and isotopic characteristics and evolution of the Jurassic volcanic arc between Arica (18°30â²S) and Tocopilla (22°S), North Chilean Coastal Cordillera
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Most of the investigated samples have high Ba, Zr, and Th concentrations compared to island arc mafic volcanic rocks. About 20% of the Jurassic arc volcanics comprise of dacitic to rhyolitic rocks. These characteristics combined with the Pb isotopic composition that shows the influence of a Palaeozoic (or partly older) basement point to a continental margin setting for the North Chilean Jurassic arc. The distribution of the magmatic rocks throughout time, their textures, and the character of intercalated sedimentary rocks reflect westward movement of the magma sources and of the arc/back-arc boundary relative to the current coast line during the Early Bajocian on a broad front between 19°30Ⲡand 21°S.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemie der Erde - Geochemistry - Volume 65, Issue 1, 21 February 2005, Pages 47-78
Journal: Chemie der Erde - Geochemistry - Volume 65, Issue 1, 21 February 2005, Pages 47-78
نویسندگان
Wolfgang Kramer, Wolfgang Siebel, Rolf L. Romer, Günther Haase, Martin Zimmer, Ralph Ehrlichmann,