U-pb Age Of The Coesite-bearing Eclogite From Nw Borborema Province, Ne Brazil: Implications For Western Gondwana Assembly

dc.creatorDos Santos T.J.S.
dc.creatorAmaral W.D.S.
dc.creatorAncelmi M.F.
dc.creatorPitarello M.Z.
dc.creatorFuck R.A.
dc.creatorDantas E.L.
dc.date2014
dc.date2015-06-25T17:56:48Z
dc.date2015-11-26T14:47:07Z
dc.date2015-06-25T17:56:48Z
dc.date2015-11-26T14:47:07Z
dc.date.accessioned2018-03-28T21:57:18Z
dc.date.available2018-03-28T21:57:18Z
dc.identifier
dc.identifierGondwana Research. Elsevier Inc., v. , n. , p. - , 2014.
dc.identifier1342937X
dc.identifier10.1016/j.gr.2014.09.013
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84923052474&partnerID=40&md5=3c29d4807ebf11d8c679c4e2afefde29
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/87122
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/87122
dc.identifier2-s2.0-84923052474
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1253139
dc.descriptionThe Late Neoproterozoic assembly of western Gondwana played an important role in the subduction of oceanic and continental lithospheres. Such event was also a source of arc magmatism, reworking of cratonic margins and development of ultra-high pressure (UHP) suture zones. In the Borborema province, NE Brazil, we have described for the first time UHP rocks enclosed within gneiss migmatite and calc-silicate rocks. They bear coesite included in atoll-type garnet from metamafic rocks, identified by petrographic study and Raman microspectroscopy analysis. U-Pb zircon dating of the leucosome of the migmatites and the calc-silicate rock displays, concordant ages of 639. ±. 10. Ma and 649.7. ±. 5. Ma, respectively, here interpreted as the minimum age of the eclogitization event in the region. U-Pb zircon dating of the coesite-bearing rock defined a concordia age of 614. 9. ±. 7.9. Ma that comprised the retrograde eclogitic conditions to amphibolite facies. The UHP rocks, mostly retrograded to garnet amphibolites, occur enclosed in the Paleoproterozoic continental block composed of calc-silicate rocks, migmatized sillimanite gneiss, mylonitic augen gneiss and granitic and tonalitic gneiss along a narrow N-S oriented belt between the Santa Quite´ria magmatic arc and the Transbrasiliano lineament. This block was involved in the subduction to UHP eclogite depths, and was retrogressed to amphibolite during its exhumation and thrusting. Our data indicate an important Neoproterozoic transcontinental suture zone connecting the Pharusian belt with Borborema Province, and probably with the Brasi´lia belt in central Brazil.
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dc.languageen
dc.publisherElsevier Inc.
dc.relationGondwana Research
dc.rightsfechado
dc.sourceScopus
dc.titleU-pb Age Of The Coesite-bearing Eclogite From Nw Borborema Province, Ne Brazil: Implications For Western Gondwana Assembly
dc.typeArtículos de revistas


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