کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5785976 1640328 2017 55 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
Late Paleozoic rift-related basalts from central Inner Mongolia, China
ترجمه فارسی عنوان
بازالت های وابسته به ریف پالئوزوئیک متعارف در مغولستان مرکزی چین
کلمات کلیدی
کمربند اوراسیایی آسیای مرکزی، مغولستان داخلی، کمی بعد کربن سیاه اولیه پرمین، بازالت، بریدگی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی
Late Paleozoic basaltic volcanism widely occurred in central Inner Mongolia, the southeastern part of the Central Asia Orogenic Blet (CAOB). Three volcanic pulses are identified by ion microprobe (SHRIMP II) zircon U-Pb analysis, which are Late Carboniferous (ca. 315 Ma), the latest Carboniferous (ca. 303 Ma) and early Permian (ca. 284 Ma). Basalts in the earliest stage are characterized by flat HREE, depletion in Nb and Ta, MORB-like Th/Yb ratios and depleted mantle (DM)-like Hf isotopic ratios. These are similar to forearc basalts, that have been generated by melting of a fluxed depleted mantle in an extensional environment. The latest Carboniferous basalts (sample D1363) have no Zr-Hf anomalies, relatively radiogenic Hf isotopic ratios (εHf(t) = +12.1 to +19.7) and high δ18O values up to 8.5‰, VSMOW. These are likely to be magmas originated from decompressional melting of a depleted mantle that interacted with ocean floor pillow basalts during their ascending through the crust. The early Permian sample D1380 have variable 206Pb/238U zircon ages with an interpreted magma crystallization age of 284.4 ± 2.5 Ma. These zircons have scattered Hf isotope (εHf(t) = +5 to +14) and δ18O (1.8-11.0‰, VSMOW), which suggest the involvement of a relatively enriched mantle source. Overall the temporal evolution of the Late Paleozoic basaltic volcanism from central Inner Mongolia suggests a rift-related tectonic setting.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 144, 15 August 2017, Pages 155-170
نویسندگان
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