کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8906844 1634662 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Controls on the iron isotopic composition of global arc magmas
ترجمه فارسی عنوان
کنترل ترکیبات ایزوتوپ آهن ماگماهای قوس جهانی را کنترل می کند
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی
Data from intra-arc to back-arc rifts in the western Pacific show that these arc signatures are rapidly dispersed by influx of DMM or OIB mantle once intra- and back-arc rifting and slab rollback gains momentum. We suggest that the characteristic light arc signatures only form when the source is lodged under arcs where sub-arc mantle undergoes corner flow forming an isolated roll. This process of heavy iron depletion is most efficient in the high ϕ arcs of the western Pacific and least prevalent in the low ϕ arcs of the eastern Pacific where δ57Fe values are MORB-like. This implies that there is a fundamental change in character of sub-arc mantle melting between east and west Pacific, percolative and fluid fluxed in the west and diapiric and decompressional in the east.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 494, 15 July 2018, Pages 190-201
نویسندگان
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