Abstract
The Itabaiana mafic dike swarm (Paraiba State) is inserted in the Transversal Zone domain at eastern Borborema Province (NE Brazil). It comprises two dike sets of deci- to centimetric dimension in width, which are c . 40 km far from. Dikes are geochemically basalts to andesites, but dominantly including andesite basalts with sub-alkaline, tholeiitic affinity. As a whole, the mineralogical assembly is represented by labradorite, titano-augite and olivine (Fo 76-84 ), which occur as fine-grained groundmass as well microfenocristals. Iddingsite and bowlingite are pervasive secondary mineral phases replacing olivine and pyroxene. Carbonate occurs filling vesicles, and is also a common mineral phase in the studied dikes. Minor and rare earth spectra are similar for all dikes, and are characterized by moderate, chondrite-related, enrichment in Rb, Ba, Th, K and light rare earth elements, and in minor extent in Zr, Hf and Ti. Differences in respect to (La/Yb) N ratios suggest small variation in partial melting rates from a common source that could be lithospheric mantle.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
