【摘 要】
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Within the Sao Roque Domain of the Neoproterozoic Ribeira Fold Belt (southeaste Brazil) we have identified an ophiolitic complex (Pirapora ophiolite) display in
【机 构】
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Geochronological Research Center - Geoscience Institute of University of Sao Paulo, Rua do Lago 562,
论文部分内容阅读
Within the Sao Roque Domain of the Neoproterozoic Ribeira Fold Belt (southeaste Brazil) we have identified an ophiolitic complex (Pirapora ophiolite) display ing a characteristic oceanic lithospheric stratigraphy.From bottom to top, it includes: 1) a lower crustal/upper mantle section (dunitic cumulates with chromitite-magnetite layers); 2) a lower crustal section (metagabbro and flasergabbro mafic cumulates with gabbroic pegmatoids); and 3) an upper crustal section (deformed fine-grained, greenschist facies metamafics with remains of a sheeted dike complex, pillow lavas and cherts).
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