NDLI: K–Ar ages and petrology of the late Miocene pumices from the Maragheh Formation, northwest Iran

Content Provider	Springer Nature Link
Author	Sawada, Yoshihiro Zaree, Gholam Reza Sakai, Tetsuya Itaya, Tetsumaru Yagi, Koshi Imaizumi, Michiaki Ataabadi, Majid Mirzaie Fortelius, Mikael
Copyright Year	2016
Abstract	Pumice beds of the Maragheh Formation, which is distributed on the plains at the foot of the late Cenozoic Sahand volcano, NW Iran, consist of the Mordaq tuff bed, lower pumice beds (A and B), middle pumice bed and upper pumice bed, in ascending order. New hornblende and plagioclase K–Ar ages of the pumices from these are: Mordaq tuff bed: 8.14 ± 0.27 Ma, lower pumice beds (A): 7.54 ± 0.22 Ma, lower pumice beds (B): 6.95 ± 0.28 Ma, middle pumice bed: 7.87 ± 0.29 Ma, upper pumice bed: 6.96 ± 0.31 Ma. The middle pumice bed is a flood deposit, and the chemical compositions of glass, hornblende and biotite in pumices overlap those from the lower pumice beds (A). These features indicate that the pumices of the middle pumice bed were derived from a similar source to the lower pumice beds (A). Chemical compositions of pumices from the Maragheh Formation fall in the dacite field of the total alkali-silica (TAS) classification diagram and slightly differ from those of the Plio–Pleistocene rocks from the Sahand volcano. Chemical compositions of late Miocene Maragheh Formation pumices show adakitic features with high Sr contents (698–545 ppm), and low Y (12–8 ppm). It is inferred that the source materials of the adakitic dacite magma were amphibole eclogite or garnet amphibolite originating from the Neo-Thetys plate subducted beneath the Eurasia plate.
Starting Page	399
Ending Page	431
Page Count	33
File Format	PDF
ISSN	18671594
Journal	Palaeobiodiversity and Palaeoenvironments
Volume Number	96
Issue Number	3
e-ISSN	18671608
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-06-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Iran Maragheh formation Late Miocene K–Ar age Hominoid Dacite pumice Adakite Paleontology Biodiversity Animal Systematics/Taxonomy/Biogeography Plant Systematics/Taxonomy/Biogeography Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Geology Ecology, Evolution, Behavior and Systematics Global and Planetary Change Paleontology

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