U-Pb Ages and Hf Isotopes in Zircons from Parautochthonous Mesozoic Terranes in the Western Margin of Pangea: Implications for the Terrane Configurations in the Northern Andes
| العنوان: | U-Pb Ages and Hf Isotopes in Zircons from Parautochthonous Mesozoic Terranes in the Western Margin of Pangea: Implications for the Terrane Configurations in the Northern Andes |
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| المؤلفون: | Agustín Cardona, Camilo Bustamante, Carlos José Archanjo, Victor A. Valencia, Andres Bustamante |
| المصدر: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| بيانات النشر: | University of Chicago Press, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Metamorphic rock, Schist, Geology, Fault (geology), 010502 geochemistry & geophysics, 01 natural sciences, Paleontology, Basement (geology), Tonian, PANGÉA, Mesozoic, 0105 earth and related environmental sciences, Terrane, Zircon |
| الوصف: | U-Pb laser ablation inductively coupled plasma mass spectrometry ages and Hf isotopes in zircons were used to constrain the nature of two geological units representative of the basement of the Central Cordillera of Colombia. Graphite-quartz-muscovite schists from the Cajamarca Complex show inherited detrital zircons supplied mostly from Late Jurassic (ca. 167 Ma), Ediacaran (ca. 638 Ma), and Tonian (Grenvillian; ca. 1000 Ma) sources. These marine volcanosedimentary deposits form an N-trending metamorphic belt in fault contact to the east with orthogneisses and amphibolites of the Tierradentro unit. Zircon U-Pb determinations of the Tierradentro rocks—previously interpreted as Grenvillian basement slices—yielded crystallization ages between 271 and 234 Ma. Initial Hf data reveal that the Tierradentro unit shares isotopic characteristics similar to other Permo-Triassic rocks of the Central Cordillera. In contrast, inherited detrital zircons from the Jurassic metasedimentary rocks suggest that their ... |
| تدمد: | 1537-5269 0022-1376 |
| DOI: | 10.1086/693014 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3d0df3dec9460c2d659538587f23e1f6 https://doi.org/10.1086/693014 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....3d0df3dec9460c2d659538587f23e1f6 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15375269 00221376 |
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| DOI: | 10.1086/693014 |