کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4730728 1640375 2014 22 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Intraplate geodynamics and magmatism in the evolution of the Central Asian Orogenic Belt
ترجمه فارسی عنوان
ژئودیناما و ماگماتیسم درون تکامل کمربندهای آسیای مرکزی آسیای میانه
کلمات کلیدی
کمربند اوراسیایی آسیای میانه، سیبری، حاشیه قاره ای فعال نقطه داغ، ماگماتیسم درونی عنصر نادر، ترکیبات ایزوتوپیک، گوجه فرنگی، بازسازی ژئودینامیک
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی


• Central Asian Orogenic Belt is a good example of accretionary folded structure.
• It was produced by convergence between Siberian continent and paleoocean complexes.
• It is accepted that plate tectonics was leading mechanism in CAOB evolution.
• Activity related to hotspots was also significant for crust production in the CAOB.
• Hotspots participated both in crust formation and further intracontinental reworking.

The Central Asian Orogenic Belt (CAOB) was produced as a consequence of the successive closure of the Paleoasian Ocean and the accretion of structures formed within it (island arcs, oceanic islands, and backarc basins) to the Siberian continent. The belt started developing in the latest Late Neoproterozoic, and this process terminated in the latest Permian in response to the collision of the Siberian and North China continents that resulted in closure of the Paleoasian ocean (Metcalfe, 2006; Li et al., 2014; Liu et al., 2009; Xiao et al., 2010; Didenko et al., 2010). Throughout the whole evolutionary history of this Orogenic Belt, a leading role in its evolution was played by convergent processes. Along with these processes, an important contribution to the evolution of the composition and structure of the crust in the belt was made by deep geodynamic processes related to the activity of mantle plumes.Indicator complexes of the activity of mantle plumes are identified, and their major distribution patterns in CAOB structures are determined. A number of epochs and areas of intraplate magmatism are distinguished, including the Neoproterozoic one (Rodinia breakup and the origin of alkaline rock belt in the marginal part of the Siberian craton); Neoproterozoic–Early Cambrian (origin of oceanic islands in the Paleoasian Ocean); Late Cambrian–Early Ordovician (origin of LIP within the region of Early Caledonian structures in CAOB); Middle Paleozoic (origin of LIP in the Altai–Sayan rift system); Late Paleozoic–Early Mesozoic (origin of the Tarim flood-basalt province, Central Asian rift system, and a number of related zonal magmatic areas); Late Mesozoic–Cenozoic (origin of continental volcanic areas in Central Asia).Geochemical and isotopic characteristics are determined for magmatic complexes that are indicator complexes for areas of intraplate magmatism of various age, and their major evolutionary trends are discussed. Available data indicate that mantle plumes practically did not cease to affect crustal growth and transformations in CAOB in relation to the migration of the Siberian continent throughout the whole time span when the belt was formed above a cluster of hotspots, which is compared with the African superplume.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 93, 15 October 2014, Pages 158–179
نویسندگان
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