SavedAdd your journal

Journals / Turkish Journal of Earth Sciences / 2008 / Cilt: 17 - Sayı: 1

Petrology and 40Ar-39Ar Age of the Bimodal Orduzu Volcanics (Malatya) from the Western end of the Eastern Anatolian Neogene Volcanism, Turkey

Ayten ÖNAL
Durmuş BOZTUĞ
Mehmet ARSLAN
Pages
85–109
Publication Date
2008-01-01
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

From the field relations and geochemical data, it is concluded that three distinct magma sources were spatially and temporally involved in the genesis of the Orduzu volcanics, that include a calc-alkaline, crustal-derived rhyolitic melt, another calc-alkaline, lithospheric mantle-derived andesitic magma, and a mildly alkaline, lithospheric mantle-derived basaltic magma.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:The Orduzu volcanics, which are part of the Yamadağ volcanics in the Malatya region, include rhyolite, rhyolitic dykes, trachyandesite and basaltic trachyandesitic dykes.
📊
Key Findings & Data:Incremental 40Ar-39Ar dating on plagioclase from the rhyolite, from rhyolite dykes and basaltic trachyandesite yielded consistently 16 Ma (Middle Miocene).
💡
Conclusion & Impact:From the field relations and geochemical data, it is concluded that three distinct magma sources were spatially and temporally involved in the genesis of the Orduzu volcanics, that include a calc-alkaline, crustal-derived rhyolitic melt, another calc-alkaline, lithospheric mantle-derived andesitic magma, and a mildly alkaline, lithospheric mantle-derived basaltic magma.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:petrology · Ar-Ar dating · Neogene volcanism

Abstract

The Orduzu volcanics, which are part of the Yamadağ volcanics in the Malatya region, include rhyolite, rhyolitic dykes, trachyandesite and basaltic trachyandesitic dykes. Mafic globular occurrences within the basaltic trachyandesitic dykes, the existence of basaltic trachyandesite enclaves within the trachyandesite, and other textural and geochemical evidence all indicate magma mingling/mixing. Incremental 40Ar-39Ar dating on plagioclase from the rhyolite, from rhyolite dykes and basaltic trachyandesite yielded consistently 16 Ma (Middle Miocene). Primordial mantle-normalized spider diagrams of the rhyolite and rhyolitic dykes represent enrichments in some large ion lithophile elements (Cs, Rb, Ba, K, Th, U) but remarkably depletion in Sr, Nb, Ti, Eu and slight depletion in some high field strength elements (Hf, Zr) relative to the trachyandesites and basaltic trachyandesitic dykes. Chondrite-normalized rare earth element spidergrams yield a high (La/Lu)CN(18-47) and Eu/Eu* (0.57-0.92) ratios for the rhyolites and rhyloitic dykes, but a low (La/Lu)CN (7-13) and Eu/Eu* (0.86-1.05) values for the trachyandesites and basaltic trachyandesitic dykes. From the field relations and geochemical data, it is concluded that three distinct magma sources were spatially and temporally involved in the genesis of the Orduzu volcanics, that include a calc-alkaline, crustal-derived rhyolitic melt, another calc-alkaline, lithospheric mantle-derived andesitic magma, and a mildly alkaline, lithospheric mantle-derived basaltic magma.

Özet

The Orduzu volcanics, which are part of the Yamadağ volcanics in the Malatya region, include rhyolite, rhyolitic dykes, trachyandesite and basaltic trachyandesitic dykes. Mafic globular occurrences within the basaltic trachyandesitic dykes, the existence of basaltic trachyandesite enclaves within the trachyandesite, and other textural and geochemical evidence all indicate magma mingling/mixing. Incremental 40Ar-39Ar dating on plagioclase from the rhyolite, from rhyolite dykes and basaltic trachyandesite yielded consistently 16 Ma (Middle Miocene). Primordial mantle-normalized spider diagrams of the rhyolite and rhyolitic dykes represent enrichments in some large ion lithophile elements (Cs, Rb, Ba, K, Th, U) but remarkably depletion in Sr, Nb, Ti, Eu and slight depletion in some high field strength elements (Hf, Zr) relative to the trachyandesites and basaltic trachyandesitic dykes. Chondrite-normalized rare earth element spidergrams yield a high (La/Lu)CN(18-47) and Eu/Eu* (0.57-0.92) ratios for the rhyolites and rhyloitic dykes, but a low (La/Lu)CN (7-13) and Eu/Eu* (0.86-1.05) values for the trachyandesites and basaltic trachyandesitic dykes. From the field relations and geochemical data, it is concluded that three distinct magma sources were spatially and temporally involved in the genesis of the Orduzu volcanics, that include a calc-alkaline, crustal-derived rhyolitic melt, another calc-alkaline, lithospheric mantle-derived andesitic magma, and a mildly alkaline, lithospheric mantle-derived basaltic magma.

🔖

Cite This Article

ÖNAL, A., BOZTUĞ, D., ARSLAN, M. (2008). Petrology and 40Ar-39Ar Age of the Bimodal Orduzu Volcanics (Malatya) from the Western end of the Eastern Anatolian Neogene Volcanism, Turkey. Turkish Journal of Earth Sciences, Cilt: 17 - Sayı: 1, 85–109. https://ajindex.com/articles/384787

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (9)

  1. ALPASLAN, M., YILMAZ, H. & TEMEL, A. 2004. Geochemistry of post- collision Pliocene–Quaternary Karaşar basalt (Divrigi-Sivas, Eastern Turkey): Evidence for partial melting processes. Geologica Carpathica 55, 487–500.
  2. ARGER, J., MITCHEL, J. & WESTAWAY, R.W.C. 2000. Neogene and Quaternary volcanism of southeastern Turkey. In: BOZKURT, E., WINCHESTER, J.A. & PIPER, J.D.A. (eds), Tectonics and Magmatism in Turkey and its Surrounding Area. Geological Society, London, Special Publications 173, 459–487.
  3. ARMSTRONG, J.T. 1995. A package of correction programs for the quantitative electron microbeam X-ray analysis of thick polished materials, thin films, and particles. Microbeam Analysis 4, 177–200.
  4. BRIGATTI, M.F., MEDICI, L., SACCANI, E. & VACCARO, C. 1996. Crystal chemistry and petrologic significance of Fe (super 3+)-rich phlogopite from the Tapira carbonatite complex, Brazil. American Mineralogist 81, 913–927.
  5. CEBULA, G.T., KUNK, M.J., MEHNERT, H.H., NAESER, C.W., OBRADOVICH, J.D. & SUTTER, J.F. 1986. The Fish Canyon Tuff, a potential standard for the 40Ar-39Ar and fission-track dating methods. In: 6th International Conferance on Geochronology, Cosmochronology and Isotope Geology 6, Terra Cognita, p. 139. DEMİR, O. 1997.
  6. Malatya, İsmetpaşa, Akçadağ, Kürecik, Hekimhan, Arguvan ve Karakaya Baraj Gölü Arasındaki Alanın Jeolojisi ve Hidrokarbon Olanakları [Geology and Hydrocarbon Potential of the Area Between Malatya, İsmetpaşa, Akçadağ, Kürecik, Hekimhan, Arguvan and Karakaya Dam]. Turkish Petroleum Corporation Report no. 3781[in Turkish, unpublished]. DEPAOLO, D.J. & DALEY, E.E. 2000. Neodymium isotopes in basalts of the southwest basin and range and lithospheric thinning during continental extension. Chemical Geology 169, 157–185.
  7. ELMAS, A. & YILMAZ, Y. 2003. Development of an oblique subduction zone – Tectonic evolution of the Thethys suture zone in southeast Turkey. International Geology Review 45, 827–840.
  8. EKİCİ, T., ALPASLAN, M., PARLAK, O. & TEMEL, A. 2006. Geochemistry of the Pliocene basalts erupted along the Malatya-Ovacık fault zone (MOFZ), eastern Anatolia, Turkey: Implications for source characteristics and partial melting processes. Chemie der Erde Geochemistry 67, 201–212.
  9. ERCAN, T., FUJITANI, T., MATSUDA, J.I., TOKEL, S., NOTSU, K., UI, T., CAN, B., SELVİ, Y., YILDIRIM, T., FİŞEKÇİ, A., ÖLMEZ, M. & AKBAŞLI, A. 1990. The origin and evolution of the Cenozoic volcanism of Hasandağı-Karacalıdağ area (Central Anatolia). Bulletin of Geomorphology 18, 9–5