中南部-比利牛斯褶皱和冲断带的构造受地下资料的约束

IF 1.3 4区 地球科学 Q2 GEOLOGY
J. Muñoz, Joana Mencos, E. Roca, N. Carrera, Ò. Gratacós, O. Ferrer, O. Fernández
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引用次数: 53

摘要

对比利牛斯山脉中南部褶皱和冲断带现有地震线的解释,与勘探井方便地联系在一起,定义了比利牛斯山脉这一领域的主要结构特征。特别地,它们定义了底逆冲下的原生前陆的几何形状和面积扩展。几条选定的构造线的测绘为比利牛斯山脉中南部的构造解释带来了限制,包括本地前陆选定地层层位之间的断裂线和基底卷入的逆冲片与底板逆冲片之间的分支线。南比利牛斯褶皱和冲断带在地表的几何特征与这些构造线在地下的线性趋势形成鲜明对比。这一凸起是中始新世以来南比利牛斯逆冲断层在古近纪原生层序上逆冲位移梯度作用下形成的次级递进曲率的结果。位移梯度是由弱盐层分布不均匀造成的,主要是三叠系和上始新统弱盐层。从中新世早期到晚渐新世,南向位移最小值为52km,如果加上褶皱、解理/裂缝发育造成的内部缩短以及上盘侵蚀,南向位移将显著增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The structure of the South-Central-Pyrenean fold and thrust belt as constrained by subsurface data
The interpretation of the available seismic lines of the South-Central-Pyrenean fold and thrust belt, conveniently tied with the exploration wells, define the main structural features of this realm of the Pyrenees. In particular, they define the geometry and areal extension of the autochthonous foreland underneath the sole thrust. The mapping ofseveral selected structural lines brings constraints for the structural interpretation of the South-Central Pyrenees, including the cut-off lines between selected stratigraphic horizons of the autochthonous foreland and the branch line between basement-involved thrust sheets and the sole thrust. The thrust salient which characterizes at surface the geometry of the South-Pyrenean fold and thrust belt contrasts with the linear trend of these structural lines at subsurface. This salient has been the result of a secondary progressive curvature developed since Middle Eocene times by thrust displacement gradients during verthrusting of the South-Pyrenean thrust sheets above a Paleogene autochthonous sequence. Displacement gradients resulted from the uneven distribution of weak salt layers, mostly the Triassic and the Upper Eocene ones. The minimum amount of South-directed displacement from early MiddleEocene times to Late Oligocene is 52km, which would be significantly higher if internal shortening by folding and cleavage/fracture development as well as hanging-wall erosion is added.
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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