Petrophysical analysis of a mid-crustal reflector in the IBERSEIS profile, SW Spain

doi:10.1016/j.tecto.2012.05.004

	Petrophysical analysis of a mid-crustal reflector in the IBERSEIS profile, SW Spain
	Brown, D.1; Zhang, X.2; Palomeras, I.3; Simancas, F.4; Carbonell, R.1; Juhlin, C.5; Salisbury, M.6
刊名	TECTONOPHYSICS
	2012-07-05
卷号	550 页码:35-46
关键词	Petrophysics Mid-crustal reflectors IBERSEIS Seismic velocities
ISSN号	0040-1951
DOI	10.1016/j.tecto.2012.05.004
文献子类	Article
英文摘要	The origin of strong crustal reflectors in vertical incidence reflection seismic data is generally attributed to either rock layering, deformation fabrics in shear zones, fluids, or igneous intrusions. The IBERSEIS normal incidence reflection and wide-angle seismic profiles in SW Spain imaged a large, high velocity, subhorizontal reflector in the middle crust (the IBERSEIS Reflective Body) whose origin has been attributed to a mafic intrusion. In order to test this hypothesis, in this paper we present laboratory measurements of Vp, Vs, and density from 17 samples of mafic igneous and metamorphic rocks, and metasediments that are thought to be equivalent to the proposed IBERSEIS Reflective Body. These measurements are then corrected to 400 degrees C at 600 MPa and used to calculate Poisson's ratio and to compare it, Vp, and Vs to values measured in situ by wide-angle data. Finally, normal incidence reflection coefficients are calculated to test if the measured lithologies could reproduce the reflectivity imaged in the vertical incidence reflection seismic data for the IBERSEIS Reflective Body. Our physical property measurements are very similar to those modeled from the wide-angle data, and our reflection coefficients are sufficiently high to cause strong mid-crustal reflectivity. Our data indicate, therefore, that previous interpretations of the IBERSEIS Reflective Body as a mafic sill are quite reasonable. (C) 2012 Elsevier B.V. All rights reserved.
WOS关键词	SEISMIC VELOCITY STRUCTURE ; LAYERED MAFIC INTRUSION ; SERIE DEI LAGHI ; CONTINENTAL-CRUST ; WAVE VELOCITIES ; P-WAVE ; ROCKS ; IBERIA ; ANISOTROPY ; ORIGIN
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000306878300003
资助机构	Spanish Ministry of Education and Science (MEC)(CGL2006-03364/BTE ; Spanish Ministry of Education and Science (MEC)(CGL2006-03364/BTE ; CGL2010-17280 ; CGL2010-17280 ; CSD2006-00041) ; CSD2006-00041) ; Spanish Ministry of Education and Science (MEC)(CGL2006-03364/BTE ; Spanish Ministry of Education and Science (MEC)(CGL2006-03364/BTE ; CGL2010-17280 ; CGL2010-17280 ; CSD2006-00041) ; CSD2006-00041) ; Spanish Ministry of Education and Science (MEC)(CGL2006-03364/BTE ; Spanish Ministry of Education and Science (MEC)(CGL2006-03364/BTE ; CGL2010-17280 ; CGL2010-17280 ; CSD2006-00041) ; CSD2006-00041) ; Spanish Ministry of Education and Science (MEC)(CGL2006-03364/BTE ; Spanish Ministry of Education and Science (MEC)(CGL2006-03364/BTE ; CGL2010-17280 ; CGL2010-17280 ; CSD2006-00041) ; CSD2006-00041)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84526]
专题	中国科学院地质与地球物理研究所
通讯作者	Brown, D.
作者单位	1.CSIC, Inst Ciencias Tierra Jaume Almera, E-08028 Barcelona, Spain 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Rice Univ, Dept Earth Sci, Houston, TX 77005 USA 4.Univ Granada, Dept Geodinam, E-19071 Granada, Spain 5.Uppsala Univ, Dept Earth Sci, SE-75236 Uppsala, Sweden 6.Geol Survey Canada Atlantic, Bedford Inst Oceanog, Dartmouth, NS B2Y 4A2, Canada
推荐引用方式 GB/T 7714	Brown, D.,Zhang, X.,Palomeras, I.,et al. Petrophysical analysis of a mid-crustal reflector in the IBERSEIS profile, SW Spain[J]. TECTONOPHYSICS,2012,550:35-46.
APA	Brown, D..,Zhang, X..,Palomeras, I..,Simancas, F..,Carbonell, R..,...&Salisbury, M..(2012).Petrophysical analysis of a mid-crustal reflector in the IBERSEIS profile, SW Spain.TECTONOPHYSICS,550,35-46.
MLA	Brown, D.,et al."Petrophysical analysis of a mid-crustal reflector in the IBERSEIS profile, SW Spain".TECTONOPHYSICS 550(2012):35-46.