Özet
Potassic volcanic rocks are characteristic of collisional tectonic zones, with recycling of continental crust playing an important role in their generation. Potassium-rich partial melts and/or fluids derived from subducted continental material initiate and/or mix with mantle-derived melts and then erupt at the surface with varying degrees of interaction with the overlying lithosphere. The details of how continental material incorporates into mantle melts are, however, uncertain. In particular, the depths from which the potassium-rich fluids and/or melts are released from the continental material and then react with the mantlederived melts remain a subject of debate. We have measured the boron isotope composition of volcanic rocks from Western Anatolia (Turkey) that erupted between 52 and 0.1 Ma, and span the lifetime of collisional events from initial arc-type eruptions to post-collisional volcanism. These data and other geochemical indices show that ultrapotassic volcanism was mainly confined to a narrow window between ca. 20 and 15 Ma, consistent with recycling of high-pressure phengite, with the timing of the potassic volcanism coincident with slab rollback and breakoff.
Orijinal dil | İngilizce |
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Sayfa (başlangıç-bitiş) | 1079-1082 |
Sayfa sayısı | 4 |
Dergi | Geology |
Hacim | 47 |
Basın numarası | 11 |
DOI'lar | |
Yayın durumu | Yayınlandı - 1 Kas 2019 |
Bibliyografik not
Publisher Copyright:© 2019 Geological Society of America.
Finansman
This research was funded by TÜBI˙TAK (Scientific and Technological Research Council of Turkey) grant 112Y128. We are grateful to Horst Marschall and two anonymous reviewers for their helpful comments. This research was funded by TÜBİTAK (Scientific and Technological Research Council of Turkey) grant 112Y128. We are grateful to Horst Marschall and two anonymous reviewers for their helpful comments.
Finansörler | Finansör numarası |
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Horst Marschall | |
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu | 112Y128 |