caa a22 4500 475827686 CHVBK 20180406123833.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/s005310000091 doi (NATIONALLICENCE)springer-10.1007/s005310000091 Interplay of orbital forcing and tectonic pulses in the Cambrian Iberian platform, NE Spain [Elektronische Daten] [J. J. Álvaro, E. Vennin, A. Muñoz, B. Sánchez-Valverde, J. L. Ojeda] The stratigraphy of carbonate/shale couplets, cycles and cycle-stacking patterns in a Cambrian shallow water platform (Iberian Chains, NE Spain) are related to sea-level changes driven by orbital forcing and by tectonic pulses. The interplay of both effects can be discriminated in the Iberian fault-controlled platform, in which the tectonic activity can be analysed by accurate and detailed biostratigraphic correlations based on trilobite zonation. The stratigraphic hierarchy of rhythmically interbedded limestones and shales, in two coeval but structurally separated geodynamic settings, yields cycle ratios of 1.44 :1. This ratio is supported by time thickness and spectral analysis, which is based on a graphic method of analysis: the Map of Grey Lines. The cycle ratio seems to be evidence for orbital forcing by obliquity and precession cycles predicted for early Paleozoic time. Carbonate/shale couplets, the smallest rhythmic units recognisable in the field, represent short-term, periodic fluctuations in supply of terrigenous sediments and carbonate productivity of uncertain origin, which could be associated with one of several harmonics of the former orbital cycles. The pulsating tectonic activity was approximated by using a quantitative analysis of tectonically induced subsidence (Shaw method). Recurrence frequencies of tectonic pulses were estimated and dated by biostratigraphy. As a result, tectonic disturbances in the Cambrian Iberian platform show an episodic periodicity comparable to that of orbital eccentricity cycles, which could mask their recognition. Springer-Verlag Berlin Heidelberg, 2000 Key words Cyclicity nationallicence Tectonism nationallicence Palaeogeography nationallicence Iberian Chains nationallicence Cambrian nationallicence Álvaro J. J. UPRESA 8014 CNRS. Cité Scientifique SN5, Université de Lille I, F-59655-Villeneuve d'Ascq. France e-mail: Jose-Javier.Alvaro@univ-lille1.fr Tel.: +33-32-0336392 Fax: +33-32-0436900, FR aut Vennin E. Laboratoire Géologie, Muséum National d'Histoire Naturelle, 43 rue Buffon, F-75007 Paris, France, FR aut Muñoz A. Departamento de Ciencias de la Tierra, Universidad de Zaragoza, E-50009 Zaragoza, Spain, ES aut Sánchez-Valverde B. Departamento de Métodos Estadísticos, Universidad de Zaragoza, E-50009 Zaragoza, Spain, ES aut Ojeda J. L. Departamento de Métodos Estadísticos, Universidad de Zaragoza, E-50009 Zaragoza, Spain, ES aut https://doi.org/10.1007/s005310000091 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s005310000091 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Álvaro J. J. UPRESA 8014 CNRS. Cité Scientifique SN5, Université de Lille I, F-59655-Villeneuve d'Ascq. France e-mail: Jose-Javier.Alvaro@univ-lille1.fr Tel.: +33-32-0336392 Fax: +33-32-0436900, FR aut NATIONALLICENCE 700 1- Vennin E. Laboratoire Géologie, Muséum National d'Histoire Naturelle, 43 rue Buffon, F-75007 Paris, France, FR aut NATIONALLICENCE 700 1- Muñoz A. Departamento de Ciencias de la Tierra, Universidad de Zaragoza, E-50009 Zaragoza, Spain, ES aut NATIONALLICENCE 700 1- Sánchez-Valverde B. Departamento de Métodos Estadísticos, Universidad de Zaragoza, E-50009 Zaragoza, Spain, ES aut NATIONALLICENCE 700 1- Ojeda J. L. Departamento de Métodos Estadísticos, Universidad de Zaragoza, E-50009 Zaragoza, Spain, ES aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer