气候变化领域集成服务门户(CCPortal): Transpressional deformation in the lithospheric mantle beneath the North Anatolian Fault Zone

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DOI	10.1016/j.tecto.2021.228989
	Transpressional deformation in the lithospheric mantle beneath the North Anatolian Fault Zone
	Chatzaras V.; Lusk A.D.J.; Chapman T.; Aldanmaz E.; Davis J.R.; Tikoff B.
发表日期	2021
ISSN	00401951
卷号	815
英文摘要	We studied mantle xenoliths sampled from two late Miocene volcanic centers located immediately north of the North Anatolian Fault Zone (NAFZ) in western Turkey. The spinel lherzolite and harzburgite xenoliths equilibrated at temperatures ranging from 757 to 1019 °C, estimated from two-pyroxene geothermometry. Pressures estimated from the Cr-in-clinopyroxene geobarometer and pseudosection modelling range from 1.0 to 2.1 GPa, which correspond to depths of 38–75 km. We used X-ray computed tomography to quantify the three-dimensional shape preferred orientation of spinel grains. Spinel displays dominantly oblate fabric ellipsoids, consistent with flattening strain. Olivine crystallographic preferred orientation (CPO), determined by electron backscatter diffraction, exhibits chiefly axial-[010] and A-type patterns. The axial-[010] CPO pattern is consistent with the spinel fabric that shows flattening strain, and is primarily developed in xenoliths from the volcanic center nearer to the NAFZ. Obliquity of olivine CPO to the spinel lineation decreases with proximity to the NAFZ, suggesting an increase in shear strain. Our results favor an interpretation of transpressional deformation in the upper mantle below the NAFZ. We attribute this pattern to a restraining bend in the mantle section of the NAFZ. © 2021 Elsevier B.V.
关键词	Flattening strain Mantle xenoliths North Anatolian Fault Olivine crystallographic preferred orientation Transpression
英文关键词	Computerized tomography; Deformation; Igneous rocks; Olivine; Structural geology; Volcanoes; Crystallographic preferred orientations; Electron back scatter diffraction; Lithospheric mantle; North Anatolian Fault Zone; Pseudosection modelling; Three-dimensional shape; Transpressional deformation; X-ray computed tomography; Shear strain; Meleagris gallopavo
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207955
作者单位	The University of Sydney, School of Geosciences, Sydney, NSW 2006, Australia; University of Wisconsin-Madison, Department of Geoscience, Madison, WI 53706, United States; University of New England, School of Environmental and Rural Science, Armidale, NSW, Australia; University of Kocaeli, Department of Geology, Izmit, TR-41040, Turkey; Carleton College, Department of Mathematics and Statistics, Northfield, MN 55057, United States
推荐引用方式 GB/T 7714	Chatzaras V.,Lusk A.D.J.,Chapman T.,et al. Transpressional deformation in the lithospheric mantle beneath the North Anatolian Fault Zone[J],2021,815.
APA	Chatzaras V.,Lusk A.D.J.,Chapman T.,Aldanmaz E.,Davis J.R.,&Tikoff B..(2021).Transpressional deformation in the lithospheric mantle beneath the North Anatolian Fault Zone.Tectonophysics,815.
MLA	Chatzaras V.,et al."Transpressional deformation in the lithospheric mantle beneath the North Anatolian Fault Zone".Tectonophysics 815(2021).