2026-05-15T23:41:29Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/46772022-04-29T12:02:48Zcom_10259.4_2560com_10259_5086com_10259_2604col_10259.4_2561
Calvín Ballester, Pablo
91
500
0000-0002-4485-2139
Villalaín Santamaria, Juan José
576
500
Casas Sainz, Antonio M.
8c24b5eb-a5a3-48cc-bb80-60d9063c2366
500
Tauxe, Lisa .
56bfcd7a-f66c-4b78-9ea1-94a590dfa091
500
Torres López, Sara
553
500
2017-11-17T12:42:01Z
2017-12
2019-12
0098-3004
http://hdl.handle.net/10259/4677
10.1016/j.cageo.2017.07.002
The Small Circle (SC) methods are founded upon two main starting hypotheses: (i) the analyzed sites were remagnetized contemporarily, acquiring the same paleomagnetic direction. (ii) The deviation of the acquired paleomagnetic signal from its original direction is only due to tilting around the bedding strike and therefore the remagnetization direction must be located on a small circle (SC) whose axis is the strike of bedding and contains the in situ paleomagnetic direction. Therefore, if we analyze several sites (with different bedding strikes) their SCs will intersect in the remagnetization direction.
The SC methods have two applications: (1) the Small Circle Intersection (SCI) method is capable of providing adequate approximations to the expected paleomagnetic direction when dealing with synfolding remagnetizations. By comparing the SCI direction with that predicted from an apparent polar wander path, the (re)magnetization can be dated. (2) Once the remagnetization direction is known, the attitude of the beds (at each site) can be restored to the moment of the acquisition of the remagnetization, showing a palinspastic reconstructuion of the structure. Some caveats are necessary under more complex tectonic scenarios, in which SC-based methods can lead to erroneous interpretations. However, the graphical output of the methods tries to avoid ‘black-box’ effects and can minimize misleading interpretations or even help, for example, to identify local or regional vertical axis rotations. In any case, the methods must be used with caution and always considering the knowledge of the tectonic frame.
In this paper, some utilities for SCs analysis are automatized by means of a new Python code and a new technique for defining the uncertainty of the solution is proposed. With pySCu the SCs methods can be easily and quickly applied, obtaining firstly a set of text files containing all calculated information and subsequently generating a graphical output on the fly.
CGL2012-38481 and
CGL2016-77560 of the MINECO (Spanish Ministry of Economy and
Competitiveness) with also FEDER founding (European Union). PC acknowledges
the MINECO for the F.P.I. research grant BES-2013-062988.
LT acknowledges support from National Science Foundation grant # EAR
1345003.
application/pdf
eng
Elsevier
Computers & Geosciences. 2017, V. 109, p. 32-42
https://doi.org/10.1016/j.cageo.2017.07.002
info:eu-repo/grantAgreement/MINECO/CGL2012-38481
info:eu-repo/grantAgreement/MINECO/CGL2016-77560
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Small circle
SCI method
Fold-test
Remagnetization
Synfolding
pySCu
Physics
Paleontology
Física
Paleontología
pySCu: A new python code for analyzing remagnetizations directions by means of small circle utilities
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
CC-LICENSE
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2022-04-29 14:02:48.362
Repositorio Institucional de la Universidad de Burgos
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