Geochemical features and petrogenesis of Late Cretaceous subduction-related volcanic rocks in the Değirmentaşı (Torul/Gümüşhane) area, Eastern Pontides (NE Turkey)

  • A. Kaygusuz Gümüşhane University
  • Ç. Saydam Eker Gümüşhane University
Keywords: late cretaceous, subduction, değirmentaşı volcanics, k-ar dating, geochemistry, eastern pontides

Abstract

Mineralogical, petrographical and geochemical data are presented for the Late Cretaceous Değirmentaşı volcanics in the Eastern Pontides (NE Turkey). These volcanics are of sub-alkaline affinity and present features of subduction-related volcanism. K/Ar dating method carried out on hornblende of the Değirmentaşı volcanic rocks yielded 77.99±3.76 Ma, corresponding to the Campanian age. They are andesite, dacite and minor rhyolite in composition and consist of plagioclase, sanidine, quartz, biotite, hornblende and opaque minerals. The studied rocks show calc-alkaline affinities and have medium to high-K contents. The rocks are enriched in large-ion lithofile elements (LILEs) and light rare earth elements (LREEs) with pronounced depletion in high-field-strength elements (HFSEs) indicating the typical characteristics of rocks from the subduction-related tectonic setting. The chondrite-normalized REE patterns (LaN/LuN=4.5-13.8) have low to medium enrichment, demonstrating similar sources for the rock suite. The main solidification processes consist of fractional crystallization with minor amounts of crustal contamination. According to geochemical evidence, the parental magma(s) of the the Değirmentaşı volcanics rocks were possibly derived from a subcontinental lithospheric mantle enriched by fluids and/or sediments from a subduction of oceanic crust.

Author Biographies

A. Kaygusuz, Gümüşhane University

Geological Engineering

Ç. Saydam Eker, Gümüşhane University

Geological Engineering

References

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Published
2021-06-30
How to Cite
Kaygusuz, A., & Saydam Eker, Ç. (2021). Geochemical features and petrogenesis of Late Cretaceous subduction-related volcanic rocks in the Değirmentaşı (Torul/Gümüşhane) area, Eastern Pontides (NE Turkey). Journal of Engineering Research and Applied Science, 10(1), 1689-1702. Retrieved from http://www.journaleras.com/index.php/jeras/article/view/234
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