globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228989
论文题名:
Transpressional deformation in the lithospheric mantle beneath the North Anatolian Fault Zone
作者: Chatzaras V.; Lusk A.D.J.; Chapman T.; Aldanmaz E.; Davis J.R.; Tikoff B.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 815
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170788
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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

Recommended Citation:
Chatzaras V.,Lusk A.D.J.,Chapman T.,et al. Transpressional deformation in the lithospheric mantle beneath the North Anatolian Fault Zone[J]. Tectonophysics,2021-01-01,815
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