کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10121341 | 1641618 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
EM modeling of the central-northern portion of Ponta Grossa Arch, Paraná Basin, Brazil
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: EM modeling of the central-northern portion of Ponta Grossa Arch, Paraná Basin, Brazil EM modeling of the central-northern portion of Ponta Grossa Arch, Paraná Basin, Brazil](/preview/png/10121341.png)
چکیده انگلیسی
Broadband remote-referenced magnetotelluric data were collected at 16 sites along a SW-NE profile across one of the main tectonic features of Paraná Basin, the Ponta Grossa Arch. This major structure was uplifted before the voluminous flood basalt event occurred during the Early Cretaceous. Here we present a 2D model for the crustal structure of Paraná Basin traversing the Ponta Grossa Arch. The geoelectrical strike is controlled by NW structures that cut through the crust as indicated by Groom-Bailey decomposition. Several smooth 2D inversions were used as a starting point to a 2D forward modeling exercise where a priori shallow information was used as constraints. That modeling strategy allowed the interpretation of two important regional features, a crustal-scale sub-vertical shear zone (200 Ω m) in a resistive (1000 Ω m) crust and a 30 Ω m lower crustal conductor confined within 25-40 km. We have interpreted the enhanced conductivity in these two features as caused by fluids originated in mantle-derived material. Crustal-scale shear zones are considered elsewhere to be important conduits for the connection of upper and lower crustal fluids. In the studied area the interpreted shear zone can be associated to main lava conduits at the time of the basalt flows. The lower crustal conductor is associated to the hydrated material that intruded, in the base of the crust, during the Mesozoic (crustal underplating).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 150, Issues 1â3, 16 May 2005, Pages 145-158
Journal: Physics of the Earth and Planetary Interiors - Volume 150, Issues 1â3, 16 May 2005, Pages 145-158
نویسندگان
Paulo de Tarso L. Menezes, Jandyr Menezes Travassos,