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Trace and Rare Earth Elements Petrochemical Constraint on Tectonogenetic Evolution of the Granitoids of Zing-Monkin area, Adamawa Massif, N.E. Nigeria

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Author Affiliations

  • 1Geology Department, Federal University of Technology, Yola, NIGERIA
  • 2Geology Programme, Abubakar Tafawa Balewa University, Bauchi, NIGERIA

Res.J.chem.sci., Volume 3, Issue (1), Pages 32-42, January,18 (2013)

Abstract

Zing-Monkin area is underlain by moderately radioactive biotite-hornblende-granodiorite, migmatites, equigranular granites, porphyritic granites, and highly radioactive fine-grained granite with subordinate pegmatites. Trace element contents of the granitoids decrease from granodiorite to the granites except Rb which behave in an opposite way. This results in a chemical gradient from granodiorite through the migmatites to the granites. The chondrite normalised rare earth elements trends indicate strongly fractionated rare earth element patterns with enriched light rare earth elements and an increasing negative Eu anomaly from the granodiorite to the granites. The gradational trace elements petrochemistry of the rock units and the antipathetic relation between Sr and Rb., Ba and Rb/Sr suggest that the granitoids are probably I-type, genetically related to a common source by fractional crystallisation. The within plate syn- to late-orogenic signatures suggest that the rocks were generated in a syn- to late-orogenic within plate tectonic setting.

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