THE SOURCE OF THE ESPINHAÇO DIAMONDS: EVIDENCES FROM SHRIMP U-PB ZIRCON AGES OF THE SOPA CONGLOMERATE AND PB-PB ZIRCON EVAPORATION AGES OF METAVOLCANIC ROCKS

THE SOURCE OF THE ESPINHAÇO DIAMONDS: EVIDENCES FROM SHRIMP U-PB ZIRCON AGES OF THE SOPA CONGLOMERATE AND PB-PB ZIRCON EVAPORATION AGES OF METAVOLCANIC ROCKS

dc.contributoren-US
dc.contributorpt-BR
dc.creatorCHAVES, MARIO LUIZ DE SÁ CARNEIRO
dc.creatorDUSSIN, TÂNIA MARIA
dc.creatorSANO, YUJI
dc.date2017-03-29
dc.date.accessioned2023-06-19T15:40:15Z
dc.date.available2023-06-19T15:40:15Z
dc.identifierhttps://ppegeo.igc.usp.br/index.php/rbg/article/view/10682
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/6693150
dc.descriptionWe present here the results of the SHRIMP U/Pb zircon ages obtained from the diamond-bearing Sopa Conglomerate and also Pb-Pb zircon evaporation age of the associated metavolcanic rocks, outcropping in the Diamantina region of the Espinhaço Range. The Sopa Conglomerate, a clast-supported rock that appear in the lower part of the Espinhaço Supergroup, was deposited mainly in alluvial fan, braided river and fan delta systems. The apparent 238U-206Pb and 207Pb-206Pb zircon ages varied from 1442 Ma to 3683 Ma and from 1726 Ma to 3599 Ma peaks, respectively. Different generations of zircon populations showed by the radiometric ages surely demonstrate the age of cratonic rocks, however it is still unknown if one of them could be correlated with a primary source rock of the diamonds. The series of K- and Fe-rich metavolcanics is coeval with the Sopa Conglomerate. The results of a single date of these rocks yielded ages of 1710±12 Ma to the crystallization of the volcanic protolith. Detrital zircons of the Sopa Conglomerate matrix are older than the primary zircons of the metavolcanic rocks outcropping in the lower Espinhaço Supergroup. Therefore, geochronological data do not provide additional evidence for the idea that diamonds are originated from these metavolcanic rocks, as supposed by some authors after geologic regional studies.en-US
dc.descriptionWe present here the results of the SHRIMP U/Pb zircon ages obtained from the diamond-bearing Sopa Conglomerate and also Pb-Pb zircon evaporation age of the associated metavolcanic rocks, outcropping in the Diamantina region of the Espinhaço Range. The Sopa Conglomerate, a clast-supported rock that appear in the lower part of the Espinhaço Supergroup, was deposited mainly in alluvial fan, braided river and fan delta systems. The apparent 238U-206Pb and 207Pb-206Pb zircon ages varied from 1442 Ma to 3683 Ma and from 1726 Ma to 3599 Ma peaks, respectively. Different generations of zircon populations showed by the radiometric ages surely demonstrate the age of cratonic rocks, however it is still unknown if one of them could be correlated with a primary source rock of the diamonds. The series of K- and Fe-rich metavolcanics is coeval with the Sopa Conglomerate. The results of a single date of these rocks yielded ages of 1710±12 Ma to the crystallization of the volcanic protolith. Detrital zircons of the Sopa Conglomerate matrix are older than the primary zircons of the metavolcanic rocks outcropping in the lower Espinhaço Supergroup. Therefore, geochronological data do not provide additional evidence for the idea that diamonds are originated from these metavolcanic rocks, as supposed by some authors after geologic regional studies.pt-BR
dc.formatapplication/pdf
dc.languageeng
dc.publisherSociedade Brasileira de Geologiapt-BR
dc.relationhttps://ppegeo.igc.usp.br/index.php/rbg/article/view/10682/10183
dc.rightsDireitos autorais 2017 Revista Brasileira de Geociênciaspt-BR
dc.sourceRevista Brasileira de Geociências; v. 30, n. 2 (2000); 265-269en-US
dc.sourceRevista Brasileira de Geociências; v. 30, n. 2 (2000); 265-269es-ES
dc.sourceRevista Brasileira de Geociências; v. 30, n. 2 (2000); 265-269pt-BR
dc.source0375-7536
dc.subjectZircon ages; Diamond; Sopa Conglomerate; Espinhaço metavolcanics.en-US
dc.subjectZircon ages; Diamond; Sopa Conglomerate; Espinhaço metavolcanics.pt-BR
dc.titleTHE SOURCE OF THE ESPINHAÇO DIAMONDS: EVIDENCES FROM SHRIMP U-PB ZIRCON AGES OF THE SOPA CONGLOMERATE AND PB-PB ZIRCON EVAPORATION AGES OF METAVOLCANIC ROCKSen-US
dc.titleTHE SOURCE OF THE ESPINHAÇO DIAMONDS: EVIDENCES FROM SHRIMP U-PB ZIRCON AGES OF THE SOPA CONGLOMERATE AND PB-PB ZIRCON EVAPORATION AGES OF METAVOLCANIC ROCKSpt-BR
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typept-BR


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