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|Title:||Paleomagnetic and rock-magnetic survey of eocene dike swarms from the Tecalitlan area (Western Mexico): Tectonic implications|
|Abstract:||TiN/Ti multilayers, 1.74-9.80 ?m thick, were deposited on 304 stainless steel substrates by reactive unbalanced magnetron sputtering. It is known that such multilayers can improve the corrosion resistance of the stainless steel. The titanium layers help to reduce the occurrence of pinholes that arise because of the irregularities in substrate surface, and decrease the porosity of subsequent TiN coatings by improving the layers microstructure. A 1400 keV deuterium beam was used to analyse the samples and combinations of RBS/NRA methods were applied to evaluate the sample spectra. The 14N(d, ?1) 12C NR cross sections are well known and were used as way to determine the 14N concentration in the TiNx layers. The corrosion resistance of the layers was studied by means of potentiodynamic polarization in a 0.5 M NaCl solution. The corrosion test demonstrated that the number of TiN/Ti layers and its total thickness determine the corrosion resistance. " 2004 Elsevier B.V. All rights reserved.",,,,,,"10.1016/j.nimb.2004.01.159",,,"http://hdl.handle.net/20.500.12104/42388","http://www.scopus.com/inward/record.url?eid=2-s2.0-2442538880&partnerID=40&md5=e9744e73f6fcd2ffc2730754bbb6e74a",,,,,,"01-abr",,"Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms",,"763|
WOS",,,,,,"Corrosion resistance; IBA methods; Reactive magnetron sputtering; TiN/Ti thin films",,,,,,"Ion beam analysis of TiN/Ti multilayers deposited by magnetron sputtering",,"Conference Paper" "45246","123456789/35008",,"Rosas-Elguera, J., Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Ingeniería Sísmica - Sede Guadalajara, CUCEI, Universidad de Guadalajara, 44840 Guadalajara, Mexico; Reyes, B.A., Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofísica - Sede Michoacán, Universidad Nacional Autónoma de México, Campus Morelia, 58089 Morelia, Mexico; Goguitchaichvili, A., Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofísica - Sede Michoacán, Universidad Nacional Autónoma de México, Campus Morelia, 58089 Morelia, Mexico; Rocha, M., Servicio Geológico Mexicano, Pachuca, Mexico; Martínez, M.L., Depto. de Geología, Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana No. 3918, Apdo. Postal 60, B.C. México, Mexico; Tostado-Plascencia, M.M., Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Ingeniería Sísmica - Sede Guadalajara, CUCEI, Universidad de Guadalajara, 44840 Guadalajara, Mexico; Valdivia, L.M.A., Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, Mexico; Miranda, C.C., Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, Mexico",,"Rosas-Elguera, J.
Miranda, C.C.",,"2011",,"For long time the western-central Mexico has been affected by oblique subduction caused by Farallon plate beneath North America. As result, smaller plates (e.g. Cocos Plate), several fault systems outlining crustal blocks (e.g. Michoacán block) and magmatic arcs (e.g. Paleocene-Early Oligocene magmatism and the Trans-Mexican Volcanic Belt) were developed. Still, no paleomagnetic data are available for Oligocene and Miocene. The principal aim of this study is to evaluate whether the tectonic rotations and relative motions of these blocks occurred before the Miocene. Here, we report a detailed rock-magnetic and paleomagnetic results from Tecalitlan area, located in the Michoacán block. Sixteen sites (about 150 oriented samples) were collected including one radiometrically dated diabase dike (35.0 1.8 Ma). Rock-magnetic experiments permitted identification of magnetic carriers and assessment of the paleomagnetic stability. Continuous susceptibility measurements vs temperature in most cases yield reasonably reversible curves with Curie points close to that of magnetite. Reliable paleomagnetic directions were obtained for 12 sites. Inclination I and declination D of the mean paleomagnetic direction obtained in this study are I = 33.1 , D = 345.0 , and Fisherian statistical parameters are k = 25, ?95 = 8.9 . The corresponding mean paleomagnetic pole position is Plat = 75.7 , Plong = 166.6 , K = 31, A95 = 8.0 . The mean inclination is in reasonably good agreement with the expected value, as derived from reference poles for the stable North America. Magnetic declination is not significantly different from that expected which is in disagreement with a counterclockwise tectonic rotation of about 20 previously reported for the studied area. Based on paleomagnetic results obtained in this study compiled with those currently available from the Michoacán Block, we propose a simple model suggesting that sometime in Eocene epoch the convergence vector of the Farallon plate relative to North America plate was normal to the trench before reaching an actual oblique convergence. " 2011 Institute of Geophysics of the ASCR, v.v.i.
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