Petrography and mineral chemistry of the basaltic rocks and dykes from the Burunköy (Çorum) region, Turkey

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2014
Atak Küçük, Aynur
Petrography and mineral chemistry of the basaltic rocks and dykes, which are outcropping in the Burunköy (Çorum) region, are discussed in the scope of this thesis. The studied rocks belong to the ophiolitic melange of İzmir-Ankara-Erzincan Suture Zone that were derived from the closure of northern branch of Neotethys. In the study area, the metamorphic rocks of Sakarya Composite Terrane tectonically overlies the ophiolitic melange units, and Upper Neocene sediments cover both units unconformably. The rocks in the study area are divided into three categories; intensely foliated-sheared metabasalts, basalts and doleritic dykes. These rocks are mostly contain pyroxene and feldspar minerals with varying crystal sizes. The augite phenocrysts display reaction rims with reddish color, compositional zoning, corrosion and tailing properties which also observed for feldspars indicating more mafic hot magma impulse into magma chamber during crystallization. The Electron Probe Microanalyser data from constituent minerals of the rock groups revealed that pyroxene and feldspar are augite and albite, respectively. Substitutional mechanism plots generally display more than one group inferring new melt influx(es) into magma that supports the petrographical observations. Mineral chemistry data indicate the rocks have a transitional character from subalkaline to alkaline that derived from a non-orogenic environment. Whole rock geochemical data including isotopic once reveal that the rocks are alkaline in character and generated in a transitional environment between E-MORB and OIB. Furthermore, the data of studied rocks suggest that these rocks evolved from a melt formed by mixture of DMM and EM-I.

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Citation Formats
A. Atak Küçük, “Petrography and mineral chemistry of the basaltic rocks and dykes from the Burunköy (Çorum) region, Turkey,” M.S. - Master of Science, Middle East Technical University, 2014.