An evaporite-bearing accretionary complex in the northern front of the Betic-Rif orogen

被引:31
作者
Perez-Valera, Fernando [1 ,2 ]
Sanchez-Gomez, Mario [1 ,3 ]
Perez-Lopez, Alberto [4 ,5 ]
Alfonso Perez-Valera, Luis [1 ]
机构
[1] Univ Jaen, Ctr Estudios Avanzados Ciencias Tierra, Jaen, Spain
[2] Univ Alicante, Dept Ciencias Tierra & Medio Ambiente, Alicante, Spain
[3] Univ Jaen, Dept Geol, Fac Ciencias Expt, Jaen, Spain
[4] Univ Granada, Dept Estratig & Paleontol, Fac Ciencias, Granada, Spain
[5] Univ Granada, CSIC, Inst Andaluz Ciencias Tierra, Armilla, Spain
关键词
accretionary complex; Betic orogen; Triassic; evaporites; GUADALQUIVIR FORELAND BASIN; MESSINIAN SALINITY CRISIS; MELANGE-FORMING PROCESSES; ANALOG MODELING APPROACH; BARBADOS RIDGE COMPLEX; ALBORAN DOMAIN BETICS; GIBRALTAR ARC; SOUTHERN SPAIN; THRUST BELT; EXTENSIONAL TECTONICS;
D O I
10.1002/2016TC004414
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The Guadalquivir Accretionary Complex forms a largely oblique prism at the northern edge of the Betic-Rif orogen, where Miocene sediments plus allochthonous evaporite-bearing units were accreted during the displacement of the Alboran Domain toward the west. Traditional interpretations end the tectonic structuring of the Betic Cordillera at the present topographic front, beyond which gravitational and/or diapiric processes would predominate. However, this study shows pervasive tectonic deformation in the outer prism with coherent oblique shortening kinematics, which is achieved through an alternation of roughly N-S arcuate thrust systems connected by E-W transfer fault zones. These structures accord well with the geophysical models that propose westward rollback subduction. The main stage of tectonic activity occurred in the early-middle Miocene, but deformation lasted until the Quaternary with the same kinematics. Evaporite rocks played a leading role in the deformation as evidenced by the suite of ductile structures in gypsum distributed throughout the area. S- and L- gypsum tectonites, scaly clay fabrics, and brittle fabrics coexist and consistently indicate westward motion (top to 290 degrees), with subordinate N-S contraction almost perpendicular to the transfer zones. This work reveals ductile tectonic fabrics in gypsum as a valuable tool to elucidate the structure and deformational history of complex tectonic melanges involving evaporites above the decollement level of accretionary wedges.
引用
收藏
页码:1006 / 1036
页数:31
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