کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4682886 | 1348951 | 2008 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Geochemistry of the Mamil Choique granitoids at Rio Chico, RÃo Negro, Argentina: Late Paleozoic crustal melting in the North Patagonian Massif
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Geochemistry of the Mamil Choique granitoids at Rio Chico, RÃo Negro, Argentina: Late Paleozoic crustal melting in the North Patagonian Massif Geochemistry of the Mamil Choique granitoids at Rio Chico, RÃo Negro, Argentina: Late Paleozoic crustal melting in the North Patagonian Massif](/preview/png/4682886.png)
چکیده انگلیسی
The Mamil Choique granitoids located in the SW border of the North Patagonian Massif consist of three peraluminous units: the banded Huenchuquil tonalites and granodiorites (HTG) and the Cerro Mojón biotite-muscovite monzogranites (CMG), which are intruded by the Nahuelfil monzogranites (NG). According to their major and trace element relations, as well as a comparison with experimentally produced melts, HTG are compatible with partial melting of mafic source rocks at variable H2O contents; residual garnet is suggested by HREE depletion that indicates a minimum P of 9-10Â kbar during melting. The CMG would have formed from partial melting of supracrustal fertile lithologies (biotite-bearing) in the presence of H2O-bearing volatile phase that resulted in Sr-rich, moderately depressed HREE melts, likely produced within the garnet stability field (7-10Â kbar). The intrusive NG display distinct geochemical signatures (low Sr, no HREE depletion) and general major element ratios akin to the experimentally produced melt at low P (â5Â kbar). Regional constraints indicate that coeval HTG and CMG emplacement took place along a decompressing path slightly postdating the climax of regional metamorphism in the host Cushamen Formation. Later NG intrusion would have occurred at upper crustal levels.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of South American Earth Sciences - Volume 25, Issue 4, June 2008, Pages 526-546
Journal: Journal of South American Earth Sciences - Volume 25, Issue 4, June 2008, Pages 526-546
نویسندگان
Mónica G. López de Luchi, MarÃa Elena Cerredo,