Seismic-reflection imaging over the South Portuguese Zone fold-and-thrust belt

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Fältnamn	Indikatorer	Metadata
000		03114naa a2200337 4500
001		oai:DiVA.org:uu-96410
003		SwePub
008		071108s2008 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-964102 URI
024	7	a https://doi.org/10.1029/2007JB0053412 DOI
040		a (SwePub)uu
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Schmelzbach, Cedricu Uppsala universitet,Geofysik4 aut
245	1 0	a Seismic-reflection imaging over the South Portuguese Zone fold-and-thrust belt
264	1	c 2008
338		a print2 rdacarrier
520		a We reprocessed an ∼35-km-long part of the IBESREIS seismic reflection profile which runs over the Iberian Pyrite Belt section of the South Portuguese Zone, SW Iberia, with the goal to image the upper crust (<15-km depth). The applied processing sequence enhanced numerous prominent reflections and diffraction patterns within the uppermost 5-s travel time relative to high-amplitude source-generated noise. A complex subsurface characterized by conflicting dips and a survey following winding roads require a crooked-line prestack migration scheme for coherent imaging. To interpret sources of diffracted energy, we additionally employed a diffraction imaging scheme which enhances diffractions at the expense of reflections.The final seismic images show south-vergent imbricate fold-and-thrust tectonics, documenting the contractive deformation that the South Portuguese Zone experienced during the Variscan Orogeny. Based on surface geological information, we correlate a low reflective unit with the shallow Upper Carboniferous Flysch Group, a highly reflective unit ranging in depth from 2 to 4 km with the Middle Carboniferous Volcano–Sedimentary Complex Group, which hosts massive sulfide deposits, and a moderately reflective unit with the Upper Devonian Phyllite–Quartzite Group. Below these units, another low-reflective facies is present, which may represent older Paleozoic metasediments. In addition, the seismic and diffraction images reveal bands of high reflectivity and distinct diffraction patterns that were interpreted as extensive layered mafic intrusions. These proposed mafic bodies may be related to the same event that triggered a huge hydrothermal activity assumed in Early Carbonifereous times.
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskap0 (SwePub)1052 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciences0 (SwePub)1052 hsv//eng
653		a Earth sciences
653		a Geovetenskap
700	1	a Simancas, J. Fernando4 aut
700	1	a Juhlin, Christopheru Uppsala universitet,Institutionen för geovetenskaper4 aut0 (Swepub:uu)chrisjuh
700	1	a Carbonell, Ramon4 aut
710	2	a Uppsala universitetb Geofysik4 org
773	0	t Journal of Geophysical Researchg 113:B8, s. B08301-q 113:B8<B08301-x 0148-0227x 2156-2202
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-96410
856	4 8	u https://doi.org/10.1029/2007JB005341

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Av författaren/redakt...: Schmelzbach, Ced ...; Simancas, J. Fer ...; Juhlin, Christop ...; Carbonell, Ramon

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