Initiation of the neomagmatism in East Anatolia

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doi: 10.1016/0040-1951(87)90256-3
Authors:Yilmaz, Y.; Saroglu, F.; Guner, Y.
Author Affiliations:Primary:
Istanbul Univ., Muhendislik Fak., Istanbul, Turkey
Other:
Maden Tetkik ve Arama Enst., Turkey
Volume Title:Deep seated processes in collision zones
Volume Authors:Gupta, Harsh K., editor
Source:Tectonophysics, 134(1-3), p.177-199; International Association of Seismology and Physics of the Earth's Interior (IASPEI) regional assembly ; symposium on Deep seated processes in collision zones, Hyderabad, India, Nov. 6, 1984, edited by Harsh K. Gupta. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0040-1951
Publication Date:1987
Note:In English. 35 refs.; illus. incl. 2 tables, strat. cols., geol. sketch maps
Summary:In eastern Anatolia, the neotectonic episode commenced with the complete elimination of the neo-Tethyan ocean floor as a result of collision between Arabia and Eurasia during the early Miocene. After the collision, continuing convergence initiated a new tectonic regime and coeval magmatic activity. The post-collisional convergence caused crustal shortening and thickening as evidenced by regionwide development of E-W-trending folds and thrusts, and conjugate strike-slip faults. The related volcanic activity progressed in three cycles. In the initial cycle, weakly alkaline volcanic rocks were produced (the Solhan volcanics). They outcrop at the W end of an E-W striking neotectonic depression, the Mus basin, which constitutes the western prolongation of the Lake Van basin. The basin is a thrust-bound depression that developed out of an original syncline by the disruption of its limbs. The lavas of the first cycle reached the surface along N-S- aligned extensional structures. In the second volcanic cycle, widespread K-type calc-alkaline volcanism occurred through crustal contribution during the late Miocene-early Pliocene when the continuing N-S convergence caused substantial shortening and thickening of the continental crust. The last volcanic cycle produced a thick volcanic cover consisting of rocks of alkaline affinity during the Pleistocene and the Quaternary when the thickened crust began to accommodate the ongoing N-S shortening by E-W extension after the formation of the east and north Anatolian transform faults. (Authors' abstract) [A.W.H.]
Subjects:Alkali basalts; Basalts; Cenozoic; Faults; Folds; Genesis; Hawaiite; Igneous rocks; Magmas; Mugearite; Neotectonics; Periodicity; Plate collision; Plate tectonics; Structural geology; Synclines; Tectonics; Thrust faults; Volcanic rocks; Volcanism; Volcanology; Anatolia; Asia; Middle East; Turkey; Eastern Anatolia; Igneous activity; Solhan region
Abstract Numbers:88M/1315
Record ID:1987050843
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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