RT info:eu-repo/semantics/article
T1 Analysing non-coaxial folding effects in the Small Circle Intersection method
A1 Calvín Ballester, Pablo
A1 Pueyo Morer, Emilio L.
A1 Ramón Ortiga, Mª José
A1 Casas Sainz, Antonio M.
A1 Villalaín Santamaria, Juan José
K1 Palaeomagnetism
K1 Remagnetization
K1 Magnetismo
K1 Magnetism
K1 Geología
K1 Geology
AB The Small Circle (SC) tools analyse the stereographic tracks (small circles) followed by thepalaeomagnetic vectors during folding processes. Working with interfolding and synfoldingremagnetizations, the Small Circle Intersection (SCI) method allows finding the best solutionof grouping that should correspond with the remagnetization direction. Once this is known,it is possible to determine the magnetization age as well as the degree of bed tilting at thismoment. The SC tools are based on some assumptions, among which the coaxiality betweenthe different deformation events is the one addressed in this work (i.e. absence of verticalaxis rotations, VARs, or differential horizontal axis rotations, dHARs). This assumption isbased on the necessity of knowing the rotation axis for folding after the acquisition of theremagnetization, and SC tools consider the bedding strike as this axis, something that isonly accomplished under coaxial folding. In order to explore how non-coaxiality affects thesolutions derived from the SC methods, we first (i) identify the variables that control theseerrors through simple models that only consider two theoretical palaeomagnetic sites, afterthat it is possible (ii) to derive the mathematical relationships between them. Finally, we (iii)simulate errors derived from the use of SC tools using a population of 30 palaeomagnetic sitesrecreating different possible scenarios with VARs and dHARs in nature.
PB Oxford University Press
SN 0956-540X
YR 2020
FD 2020-08
LK http://hdl.handle.net/10259/6109
UL http://hdl.handle.net/10259/6109
LA eng
NO Research financed by the projectsDR3AM- CGL2014-55118 and CGL2016-77560-C2 from theSpanish Ministry of Science (MINECO) and by the Applied Geology(GeoAP-E0117R) and Geotransfer groups of the Governmentof Aragon, as well as by the project BU235P18 (Junta deCastilla y Leon, Spain) and the European Regional DevelopmentFund (ERD). It has also benefited from the MAGIBER-II network(CGL2017-90632-REDT) funded by the Ministry of Science, Innovationand Universities.
DS Repositorio Institucional de la Universidad de Burgos
RD 01-may-2024