کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4683043 1348963 2008 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Geochronological data from the Faxinal coal succession, southern Paraná Basin, Brazil: A preliminary approach combining radiometric U-Pb dating and palynostratigraphy
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Geochronological data from the Faxinal coal succession, southern Paraná Basin, Brazil: A preliminary approach combining radiometric U-Pb dating and palynostratigraphy
چکیده انگلیسی

A radiometric zircon age of 285.4 ± 8.6 Ma (IDTIMS U-Pb) is reported from a tonstein layer interbedded with coal seams in the Faxinal coalfield, Rio Grande do Sul, Brazil. Calibration of palynostratigraphic data with the absolute age shows that the coal depositional interval in the southern Paraná Basin is constrained to the Sakmarian. Consequently, the basal Gondwana sequence in the southern part of the basin should lie at the Carboniferous–Permian boundary, not within the Sakmarian as previously considered. The new results are significant for correlations between the Paraná Basin and the Argentinian Paganzo Basin (302 ± 6 Ma and 288 ± 7 Ma) and with the Karoo Basin, specifically with the top of the Dwyka Tillite (302 ± 3 Ma and 299.2 ± 3.2 Ma) and the lowermost Ecca Group (288 ± 3 Ma and 289.6 ± 3.8 Ma). The evidence signifies widespread latest Carboniferous volcanic activity in western Gondwana.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of South American Earth Sciences - Volume 25, Issue 2, March 2008, Pages 246–256
نویسندگان
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