Lithostratigraphy and metallogenic features of the Tucunduba Stratiform Mafic-Ultramafic Complex, Borborema Province, Ceará – Brazil
DOI:
https://doi.org/10.11606/issn.2316-9095.v22-195274Keywords:
Ceará Central Domain, Granulite facies, Fe-Ti-(± V) oxidesAbstract
The Stratiform Mafic-Ultramafic Complex of Tucunduba (Complexo Máfico-Ultramáfico Estratiforme de Tucunduba – CMUET) is a layered body showing ellipsoidal geometry, with the major axis N025-trending and an area of ca. 4 km², composed of metapyroxenites, metagabbros, and metagabbronorites intruded into Paleoproterozoic granitic-migmatitic rocks of the Ceará Central Domain, Borborema Province, Northeastern Brazil. This magmatic association is cut by alkaline dykes of oligocene age, related to Messejana Volcanism. The Mafic-Ultramafic rocks are represented by three lithological zones: Ultramafic Zone localized in the Northwest portion of the complex, constituted by peridotitic and pyroxenitic compositions, Transition Zone characterized by mixing of pyroxenitic and gabbroic rocks, with varied texture and structure, and Mafic Zone of gabbro-noritic composition, concentrated in the southeast portion, in addition to the western and northern edges of the body. The forming zones of the CMUET undergone partial deformation and recrystallization, resulting from regional metamorphism in granulite facies, characterized by polygonization texture constituted by orthopyroxene and clinopyroxene crystals and hercynite occurrence, retrometamorphic processes in amphibolite facies evidenced by significant hornblende formation and hydrothermal alteration under greenschist facies to sub-greenschist conditions characterized by the formation of hydrated minerals (talc, serpentine, actinolite, tremolite, and chlorite). However, primary texture and structure as layering igneous, rhythmic type, and cumulate texture are still preserved. Relevant occurrences of massive ore block rich in Fe-Ti (± V) are found, mainly in the domain of metamafic rocks. Data on soil geochemistry indicate anomalous values in S, Cu, Co, Ni, Ti, and V, suggesting the existence of potential target sulfides (Cu, Co, and Ni) and oxides (Ti and V).
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