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Titolo:
Migration of the Upper Cretaceous subduction-related volcanism towards theback-arc basin of the eastern Pontide magmatic arc (NE Turkey)
Autore:
Bektas, O; Sen, C; Atici, Y; Koprubasi, N;
Indirizzi:
Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey Karadeniz Tech Univ Trabzon Turkey TR-61080 gn, TR-61080 Trabzon, Turkey Kocaeli Univ, Dept Geol Engn, TR-41200 Kocaeli, Turkey Kocaeli Univ Kocaeli Turkey TR-41200 Geol Engn, TR-41200 Kocaeli, Turkey
Titolo Testata:
GEOLOGICAL JOURNAL
fascicolo: 1-2, volume: 34, anno: 1999,
pagine: 95 - 106
SICI:
0072-1050(199901/06)34:1-2<95:MOTUCS>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLATE-TECTONICS; NORTHERN TURKEY; ISLAND-ARC; EVOLUTION; ROCKS; HISTORY; TETHYS; ALASKA; OCEAN; CRUST;
Keywords:
Pontide; subduction; NE Turkey; volcanism; back-arc; magmatic arc; Upper Cretaceous;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Sen, C Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey Karadeniz Tech Univ Trabzon Turkey TR-61080 61080 Trabzon, Turkey
Citazione:
O. Bektas et al., "Migration of the Upper Cretaceous subduction-related volcanism towards theback-arc basin of the eastern Pontide magmatic arc (NE Turkey)", GEOL J, 34(1-2), 1999, pp. 95-106

Abstract

The Eastern Pontide active continental margin extends along the eastern part of the Black Sea with an E-W trend and comprises the parallel oriented northern, southern and axial zones. Each zone is fault bound and distinguished by distinctive magmatism, lithofacies and stratigraphy. In the northern zone, from the coast of the Black Sea to Torul, the cessation of Liassic bimodal volcanism and accumulation of anoxic carbonates of the Valanginian-Barremian was followed by bimodal volcanism which evolved from a tholeiitic (TH)-calc-alkaline (CA) to high K-CA composition. These volcanics erupted sporadically in asymmetric deep basins until the end of the Senonian. In the southern zone, around Torul and Gumushane, Liassic bimodal volcanism and the accumulation of the Malm-Cenomanian platform carbonate was succeeded by Campanian volcanism, i.e. much later than volcanism in the northern zone. A second epoch of CA-high K-CA andesitic volcanism occurred in the southern zone and is intercalated with a Campanian red pelagic limestone which is also widespread in the northern zone, and known as the marker lithologic unit in the eastern Pontides. South of the southern zone, in the Bayburt-Maden area, the pelagic limestone of the Early Cretaceous and overlying ophioliticolistostromal mi lange (which contains Cenomanian MOR, WP and IA basaltic pillow lavas) are overlain by high-K calc-alkaline Campanian andesitic volcanic rocks, implying that the ophiolitic melange was formed in a back-are environment, The major and trace element geochemistry and REE patterns of the Upper Cretaceous volcanic rocks suggest a variation from hydrous IA to anhydrous back-are melting conditions on the subduction zone and the migration of are magmatism laterally from the northern to the southern zones duringthe Senonian. This change to dehydration melting and the migration of the subduction-related Late Cretaceous volcanism towards the south in the eastern Pontide Magmatic are, requires a south-dipping subduction polarity during the Senonian, Copyright (C) 1999 John Wiley & Sons, Ltd.

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Documento generato il 10/07/20 alle ore 19:17:16