期刊
JOURNAL OF STRUCTURAL GEOLOGY
卷 42, 期 -, 页码 194-211出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsg.2012.05.003
关键词
Andean oblique folds; Luracatao Valley; Cordillera oriental; Analogue models
资金
- Agencia Nacional de Promocion Cientifica [PICT-381, PICT-1441]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas [PIP-0781]
- CIUNSa [P1679]
- UBACYT [x055]
The dominant Cenozoic structural grain in northwestern Argentina trends north-south. However, several oblique folds have been mapped, mainly in the Cordillera Oriental and the Sistema de Santa Barbara. Two oblique NE-SW-trending anticlines are well exposed in the Luracatao Valley-Salta, along the western border of the Cordillera Oriental. These oblique anticlines are defined by the Palaeogene Santa Barbara Subgroup and are cut by the reverse faults bounding the Luracatao Valley. We constructed analogue models to simulate the generation of oblique NE SW anticlines inside the narrow, trough-like Luracatao Valley. Orthogonal compression and basement oblique heterogeneities, oblique compression and basement oblique heterogeneities, and oblique compression configurations were tested in the models. The first two configurations simulate the anticline formation well. In addition, we analyse dextral rotation and the influence of Neoproterozoic basement/Cretaceous rift structures as the cause of the oblique orientation. The analogue models suggest pre-Andean oblique structures controlling the oblique orientation of these Andean folds despite being a second-order planes of weakness. (C) 2012 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据