کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10120760 | 1640466 | 2018 | 24 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Shear-enhanced compaction-solution bands in quartz-rich calcarenites of the Cotiella Massif (Spanish Pyrenees)
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Shear-enhanced compaction-solution bands in quartz-rich calcarenites of the Cotiella Massif (Spanish Pyrenees) Shear-enhanced compaction-solution bands in quartz-rich calcarenites of the Cotiella Massif (Spanish Pyrenees)](/preview/png/10120760.png)
چکیده انگلیسی
We describe conjugate systems of shear-enhanced compaction bands oriented oblique to the maximum compressive stress and developed in Paleocene quartz-rich calcarenites formed by the interplay between shearing, mechanical compaction, and dissolution. These deformation bands are located in the footwall of the Cotiella Thrust (Spanish Pyrenees), and strike perpendicular to the local tectonic transport direction. Conjugate shear-enhanced compaction bands are mutually perpendicular in cross-section, forming an angle of 45° with the shallow-dipping bedding; no macroscopic evidence of shearing is found along them. These shear-enhanced compaction bands occur together with less abundant bedding-perpendicular compaction bands, which strike perpendicular to the local transport direction. The described shear-enhanced compaction bands consist of mm-thick tabular structures showing higher concentrations of quartz grains with reduced sizes in respect to the surrounding undeformed rock. Optical microscope and SEM investigations show that the high concentration of quartz clasts within the bands was caused by pressure-enhanced dissolution of calcite. Quartz grains fragmentation is also observed within the bands, with no significant clasts rotation and translation. All these features indicate that the described shear-enhanced compaction bands are hybrid structures developed during layer-parallel shortening associated with the Cotiella Thrust and are characterized by localized dissolution of calcite grains and fragmentation of quartz grains.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Structural Geology - Volume 114, September 2018, Pages 274-279
Journal: Journal of Structural Geology - Volume 114, September 2018, Pages 274-279
نویسندگان
S. Tavani, P. Granado, F. Balsamo, M. Pizzati, I. Cantarero, A. Corradetti, J.A. Muñoz,