DOI: 10.1007/s00531-013-0881-9
Scopus记录号: 2-s2.0-84878934983
论文题名: The Sabzevar blueschists of the North-Central Iranian micro-continent as remnants of the Neotethys-related oceanic crust subduction
作者: Omrani H. ; Moazzen M. ; Oberhänsli R. ; Altenberger U. ; Lange M.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 5 起始页码: 1491
结束页码: 1512
语种: 英语
英文关键词: Central Iranian micro-continent (CIM)
; Glaucophane schist
; Iran
; Neotethys Ocean
; Sabzevar
Scopus关键词: amphibolite
; blueschist
; epidote
; glaucophane
; greenschist facies
; metamorphism
; oceanic crust
; ophiolite
; pressure effect
; subduction zone
; temperature effect
; Tethys
; Iran
; Razavi Khorasan
; Sabzevar
英文摘要: The Sabzevar ophiolites mark the Neotethys suture in east-north-central Iran. The Sabzevar metamorphic rocks, as part of the Cretaceous Sabzevar ophiolitic complex, consist of blueschist, amphibolite and greenschist. The Sabzevar blueschists contain sodic amphibole, epidote, phengite, calcite ± omphacite ± quartz. The epidote amphibolite is composed of sodic-calcic amphibole, epidote, albite, phengite, quartz ± omphacite, ilmenite and titanite. The greenschist contains chlorite, plagioclase and pyrite, as main minerals. Thermobarometry of a blueschist yields a pressure of 13-15.5 kbar at temperatures of 420-500 °C. Peak metamorphic temperature/depth ratios were low (~12 °C/km), consistent with metamorphism in a subduction zone. The presence of epidote in the blueschist shows that the rocks were metamorphosed entirely within the epidote stability field. Amphibole schist samples experienced pressures of 5-7 kbar and temperatures between 450 and 550 °C. The presence of chlorite, actinolite, biotite and titanite indicate greenschist facies metamorphism. Chlorite, albite and biotite replacing garnet or glaucophane suggests temperatures of >300 °C for greenschist facies. The formation of high-pressure metamorphic rocks is related to north-east-dipping subduction of the Neotethys oceanic crust and subsequent closure during lower Eocene between the Central Iranian Micro-continent and Eurasia (North Iran). © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878934983&doi=10.1007%2fs00531-013-0881-9&partnerID=40&md5=339bc41c8d4692495a166c812fa3eeb1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70538
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Geology, University of Golestan, 4913815759 Gorgan, Iran; Department of Geology, University of Tabriz, 51664 Tabriz, Iran; Institute of Earth and Environmental Sciences, Potsdam University, Karl Liebknecht Str. 27, 14476 Potsdam, Germany
Recommended Citation:
Omrani H.,Moazzen M.,Oberhänsli R.,et al. The Sabzevar blueschists of the North-Central Iranian micro-continent as remnants of the Neotethys-related oceanic crust subduction[J]. International Journal of Earth Sciences,2013-01-01,102(5)