کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4691769 1636752 2015 22 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Neogene erosion of the Andean Cordillera in the flat-slab segment as indicated by petrography and whole-rock geochemistry from the Manantiales Foreland Basin (32°–32°30′S)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Neogene erosion of the Andean Cordillera in the flat-slab segment as indicated by petrography and whole-rock geochemistry from the Manantiales Foreland Basin (32°–32°30′S)
چکیده انگلیسی


• We analyzed geochemical provenance on a synorogenic foreland basin.
• We determined a geochemical continuity in the sedimentary succession, without repetition.
• We established a geochemical progression since intermediate to acid in the succession.

The Miocene Manantiales Foreland Basin is defined as a thick succession of sedimentary rocks belonging to the Chinches Formation in the Frontal Cordillera between 32°S and 32°30'°S, located over the flat-slab segment of the Andean Cordillera. It has been interpreted as a foreland basin that mainly received contributions from several mountain ranges such as the Principal Cordillera and Frontal Cordillera to the west. In this paper, we present a detailed study of its provenance based on the petrography and whole-rock geochemistry of sedimentary rocks from the Chinches Formation. Our results indicate that the Manantiales Basin was fed by igneous provinces in the hinterland that contain sub-alkaline intermediate rocks (andesitic) and acidic rocks (dacitic to rhyodacitic and granitic) arranged in a clear stratigraphic progression. These signatures may be assigned to Cenozoic rocks (Farellones Formation) in the Principal Cordillera and Permo-Triassic (Choiyoi Group) in the Frontal Cordillera. In contrast to a previous result, we found a continuous geochemical trend in the Chinches Formation between ca. 19 and 10 Ma opposing the idea of a tectonic repetition in the sedimentary succession.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 639, 12 January 2015, Pages 1–22
نویسندگان
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