Structural analysis of a relay ramp in the Queretaro graben, central Mexico: Implications for relay ramp development
Por:
Xu, SS, Nieto-Samaniego, AF, Alaniz-Alvarez, SA, Cerca-Martinez, LM
Publicada:
1 ago 2011
Categoría:
Geology
Resumen:
This work presents a study of the overlapping zone between the Cinco de Febrero and Cimatario normal faults in the Queretaro graben, located in Queretaro, Mexico. The profiles measured from topographic fault scarps indicate that a relay ramp was formed in the southern part of the overlapping zone. In the relay ramp there are fractures striking oblique to the major faults. Those fractures are interpreted as Riedel fractures (R') formed by minor rotation around a vertical axis. The orientation of bedding is not uniform in the relay ramp; dip directions of bedding are dependent on the sense and amount of rotation around two horizontal axes. The observed geometry of faults and bedding are consistent with published models of relay ramps in which there are three axes of rotation. Two axes are horizontal and one axis is vertical. For small faults, bedding rotations are due to both normal and reverse drags. In the relay ramp, bedding rotation due to simple shear is documented between the two l
Filiaciones:
Xu, SS:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76001, Mexico
Nieto-Samaniego, AF:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76001, Mexico
Alaniz-Alvarez, SA:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76001, Mexico
Cerca-Martinez, LM:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76001, Mexico
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