التفاصيل البيبلوغرافية
| العنوان: |
Regional high-grade metamorphic peak imprint in zircons from the mafic-ultramafic Jacurici Complex, São Francisco Craton, Brazil |
| المؤلفون: |
Dias, João Rodrigo Vargas Pilla, Marques, Juliana Charão, Bertolini, Gabriel, Frantz, José Carlos, Friedrich, Betina, Paim, Jhenifer Caroline da Silva, Silveira, Carlos José Sobrinho da, Queiroz, Waldemir José Alves |
| المصدر: |
Brazilian Journal of Geology. January 2022 52(1) |
| بيانات النشر: |
Sociedade Brasileira de Geologia, 2022. |
| سنة النشر: |
2022 |
| مصطلحات موضوعية: |
Jacurici Complex, São Francisco Craton, Serrinha Block, Salvador Curaça Belt, zircon U-Pb age |
| الوصف: |
The Cr-rich Jacurici Complex is located at the limit between the Serrinha Block and the Salvador-Curaçá Belt, Northeastern São Francisco Craton. In order to better understand the age span of magmatism and tectonism, we have studied a basement high-grade charnockite orthogneiss, a metanorite of the Complex and a crosscuting undeformed quartz-feldspar pegmatite. For the orthogneiss, SHRIMP U-Pb ages of zircon cores and overgrowth rims yielded, 2966 ± 9 Ma for crystallization and 2091 ± 10 Ma for metamorphism, respectively. Zircons from the metanorite show internal textures consistent with high grade metamorphism. The U-Pb LA-ICP-MS age determination provided a 2099 ± 6 Ma metamorphic age for the Jacurici Complex, indicating it was already emplaced during amalgamation around 2.1 Ga. Zircons from the undeformed quartz-feldspar pegmatite provided a LA-ICP-MS U-Pb age of 2083 ± 11Ma, marking the end of the N-S transcurrence. The magmatic Jacurici Complex age remains undefined, but is equal to, or older than, 2.1 Ga. Therefore, possible correlations with other mafic-ultramafic intrusions, such as the Cu-rich Caraíba Complex, should be reassessed. Our results indicate that the N-S transcurrence ended earlier in the Jacurici Complex region than in the northwestern area of the Salvador-Curaçá belt. |
| نوع الوثيقة: |
article |
| وصف الملف: |
text/html |
| اللغة: |
English |
| تدمد: |
2317-4889 |
| DOI: |
10.1590/2317-4889202120210007 |
| URL الوصول: |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000100306 |
| Rights: |
info:eu-repo/semantics/openAccess |
| رقم الانضمام: |
edssci.S2317.48892022000100306 |
| قاعدة البيانات: |
SciELO |