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Geochemical and Sr-Nd isotopic characteristics of the calc-alkaline volcanic rocks from Borcka Artvin; implications for genesis of Tertiary magmatism in the eastern Pontides NE Turkey



Geochemical and Sr-Nd isotopic characteristics of the calc-alkaline volcanic rocks from Borcka Artvin; implications for genesis of Tertiary magmatism in the eastern Pontides NE Turkey



Mineralogical Magazine 75.3: 464



Whole-rock geochemistry and Sr-Nd isotopic data are reported for the Tertiary Borcka (Artvin) volcanics in the eastern Pontide orogenic belt (NE Turkey). Borcka (Artvin) volcanics were made of two groups that comprise of basalt-basaltic andesite-basaltic trachyandesite (Group A) and andesite-trachyandesite (Group B). The Group A contains plagioclase (An(31-93) ), clinopyroxene (Wo(38-48) En(38-44) Fs(8-17) ), hornblende (Mg(0.57-0.72) phenocrysts and titanomagnetite microphenocrysts, whereas the Group B rocks include plagioclase (An(52-93) ), clinopyroxene, hornblende (Mg(0.64-0.71) phenocrysts and titanomagnetite and apatite microphenocrysts with porphyritic, microlitic porphyritic, hyalo-microlitic porphyritic, fluidal and cumulophiritic textures. Petrochemically, the volcanic rocks show calc-alkaline character with their medium K contents. They are enriched in LREE and LILE, with pronounced depletion of HFSE. The chondrite-normalized REE patterns (La(N) /Lu(N) =1-7) show low to medium enrichment, indicating similar sources for the rock suite. Textural features and calculated pressures based on the Cpx-barometer in each series indicate that the calc-alkaline magma equilibrated at shallow crustal depths under a pressure of about 2-7 kbar and approximating a crystallization depth of 5-18 km. The Borcka (Artvin) volcanics are slightly depleted in isotopic composition.(87) Sr/(86) Sr values vary between 0.70423 and 0.70511 while(143) Nd/(144) Nd values change between 0.51266 and 0.51288. Sr-Nd isotopic ratios imply that the rocks derived from depleted mantle source in their origin. The increasing values of SiO2 (wt.%), Sr (ppm) and (1/Sr)X103 ppm(-1) versus ((87) Sr/(86) Sr)(I) values reveal fractional crystallisation (FC) rather than assimilation (AFC) in their evolution.

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