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<identifier>oai:HAL:hal-00424503v1</identifier>
<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>High-pressure thermal aureoles around two Neoproterozoic synorogenic magmatic epidote-bearing granitoids, Northeastern Brazil</title>
<creator>Caby, Renaud</creator>
<creator>Sial, A. N.</creator>
<creator>Ferreira, V. P.</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>NEG-LABISE, Department of Geology, Federal University of Pernambuco, Recife ; Université du Québec</contributor>
<description>International audience</description>
<source>ISSN: 0895-9811</source>
<source>Journal of South American Earth Sciences</source>
<publisher>Elsevier</publisher>
<identifier>hal-00424503</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00424503</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00424503</source>
<source>Journal of South American Earth Sciences, Elsevier, 2009, 27 (2-3), pp.184-196. 〈10.1016/j.jsames.2008.09.005〉</source>
<identifier>DOI : 10.1016/j.jsames.2008.09.005</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2008.09.005</relation>
<language>en</language>
<subject lang=en>Northeastern Brazil</subject>
<subject lang=en>High-pressure thermal aureole</subject>
<subject lang=en>Kyanite</subject>
<subject lang=en>Magmatic epidote</subject>
<subject lang=en>Neoproterozoic</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Unusual high-pressure inner thermal aureoles are described from the Minador and Angico Torto epidote-bearing tonalitic plutons that emplaced into green schist-facies metasedimentary rocks of the Neoproterozoic Cachoeirinha-Salgueiro belt, northeastern Brazil. The foliated pelitic hornfelses display the mineral assemblage garnet, kyanite, staurolite, muscovite, biotite, plagioclase +/- quartz. Rare fibrolite is only found very close to the contacts. Hornfelses display steep mineral lineations and steeply-dipping foliations concordant with magmatic contacts. Leucocratic veinlets containing quartz, oligoclase, garnet, kyanite, staurolite, rutile and ilmenite suggest that limited melting conditions were reached very close to magmatic contacts (T >= 650 degrees C, P around 8 kbar). These high-pressure hornfelses form a few meters thick, rigid envelopes around the two plutons. Contrary to known examples of kyanite-bearing hornfelses that recorded high-temperature decompression, the nearly isobaric cooling down to ca. 450 degrees C is constrained by 3.20-3.30 Si contents of retrogressive phengites from both inner hornfelses and ductilely-deformed tonalite at the pluton margins. Isograds and bathograds are, therefore, apparently telescoped due to HP/LT shearing, possibly caused by subsequent differential vertical movements affecting these two solidified plutons. The unusual depth of emplacement of these syn-kinematic calc-alkaline plutons is explained by a tentative geodynamic model involving a pre-620 Ma-subduction setting.</description>
<date>2009</date>
</dc>
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