Transverse jointing in foreland fold-and-thrust belts: a remote sensing analysis in the eastern Pyrenees
<p>Joint systems in the eastern portion of the Ebro Basin of the eastern Pyrenees enjoy near continuous exposure from the frontal portion of the belt up to the external portion of its associated foredeep. Utilizing orthophoto mosaics of these world-class exposures, we have manually digitized o...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2020-09-01
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| Series: | Solid Earth |
| Online Access: | https://se.copernicus.org/articles/11/1643/2020/se-11-1643-2020.pdf |
| Summary: | <p>Joint systems in the eastern portion of the Ebro Basin of the eastern
Pyrenees enjoy near continuous exposure from the frontal portion of the belt
up to the external portion of its associated foredeep. Utilizing orthophoto
mosaics of these world-class exposures, we have manually digitized over
30 000 joints within a 16 km<span class="inline-formula">×50</span> km study area. The mapped traces exhibit
orientations that are dominantly perpendicular to the trend of the belt
(transverse) and, subordinately, parallel to the belt (longitudinal). In
particular, joints systematically orient perpendicular to the trend of the
belt both in the frontal folds and in the inner and central portion of the
foredeep basin. Longitudinal joints occur rarely with a disordered spatial
distribution, exhibiting null difference in abundance between the belt and
the foredeep. Joint orientations in the external portion of the foredeep
become less clustered, with adjacent areas dominated by either transverse or
oblique joints. Our data indicate that joints in the studied area formed in
the foredeep in response to a foredeep-parallel stretching, which becomes
progressively less intense within the external portion of the foredeep.
There, the minimum stress direction becomes more variable, providing evidence of the poor
contribution of the forebulge-perpendicular stretching on stress
organization.</p> |
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| ISSN: | 1869-9510 1869-9529 |