کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4681968 1635138 2016 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An overview of the Mesozoic-Cenozoic magmatism and tectonics in Eastern Paraguay and central Andes (Western Gondwana): Implications for the composition of mantle sources
ترجمه فارسی عنوان
یک مرور کلی از ماگماتیسم مزوزوئیک-سنوزوییک و زمین شناسی در پاراگوئه شرقی و مرکزی آند (غرب غندونا): تاثیرات در ترکیب منابع گوشته
کلمات کلیدی
ماگماتیسم، آمریکای جنوبی، پاراگوئه شرقی، گوجه فرنگی، منبع پایان یافته
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی


• Distinct mantle sources in Mesozoic-Cenozoic South America.
• Different geodynamic evolution for the Andean and the Paraguay-Brazil domains.
• HIMU mantle signature in the Andean domain, EMI and EMII in Paraguay-Brazil.
• Existing mantle plume model is inconsistent with South American magmatism.

The amalgamation of the Western Gondwana (including the Greater Gondwana supercraton) occurred at 600 Ma during the Brazilian – Pan African orogeny. A plate junction related to this event is marked by the Transbrazilian lineament which separates the South American continent into two sectors: the Eastern Paraguay-Brazilian and Central Andean domains. An overview of the geodynamic data from these two sectors indicates that the two domains were subjected to distinct evolutions from the Proterozoic to the present. The Andean domain is characterized by long-lived subduction processes linked to the convergence and consequent collision of microplates since the Middle Proterozoic (western Amazonian Craton) with a peak at about 600–580 Ma. The Paraguay-Brazilian domain remained relatively stable but was affected by extension episodes that reactivated ancient (Early and Middle Proterozoic) suture zones. These different geodynamic evolutions seem to reflect broadly distinct mantle compositions. In the subduction zones of the Andean domain the mantle was deeply modified by metasomatic processes following the subduction of oceanic plates. Consequently, the Andean type magma sources show a clear HIMU imprint inherited from the MORB, whereas the Paraguay-Brazilian sector shows a prevalent EMI and subordinate EMII character. The petrological data mainly from Mesozoic and Cenozoic magmatic events in the two sectors are reviewed to investigate the current mantle plume and mantle dome models for the uprising of the asthenospheric (or sub-lithospheric) material.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of South American Earth Sciences - Volume 72, December 2016, Pages 302–314
نویسندگان
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