An alternative interpretation for the map expression of “abrupt” changes in lateral stratigraphic level near transverse zones in fold-thrust belts
The map expression of “abrupt” changes in lateral stratigraphic level of a thrust fault has been traditionally interpreted to be a result of the presence of (1) a lateral (or oblique) thrust-ramp, or (2) a frontal ramp with displacement gradient, and/or (3) a combination of these geometries. These g...
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| Format: | Article |
| Language: | English |
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Elsevier
2012-07-01
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| Series: | Geoscience Frontiers |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987112000047 |
| _version_ | 1797761709207715840 |
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| author | Sanghoon Kwon Gautam Mitra |
| author_facet | Sanghoon Kwon Gautam Mitra |
| author_sort | Sanghoon Kwon |
| collection | DOAJ |
| description | The map expression of “abrupt” changes in lateral stratigraphic level of a thrust fault has been traditionally interpreted to be a result of the presence of (1) a lateral (or oblique) thrust-ramp, or (2) a frontal ramp with displacement gradient, and/or (3) a combination of these geometries. These geometries have been used to interpret the structures near transverse zones in fold-thrust belts (FTB). This contribution outlines an alternative explanation that can result in the same map pattern by lateral variations in stratigraphy along the strike of a low angle thrust fault. We describe the natural example of the Leamington transverse zone, which marks the southern margin of the Pennsylvanian–Permian Oquirrh basin with genetically related lateral stratigraphic variations in the North American Sevier FTB. Thus, the observed map pattern at this zone is closely related to lateral stratigraphic variations along the strike of a horizontal fault. Even though the present-day erosional level shows the map pattern that could be interpreted as a lateral ramp, the observed structures along the Leamington zone most likely share the effects of the presence of a lateral (or oblique) ramp, lateral stratigraphic variations along the fault trace, and the displacement gradient. |
| first_indexed | 2024-03-12T19:16:55Z |
| format | Article |
| id | doaj.art-66d544bc1db84675b89805d7e70bda1a |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T19:16:55Z |
| publishDate | 2012-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-66d544bc1db84675b89805d7e70bda1a2023-08-02T05:28:30ZengElsevierGeoscience Frontiers1674-98712012-07-013440140610.1016/j.gsf.2012.01.001An alternative interpretation for the map expression of “abrupt” changes in lateral stratigraphic level near transverse zones in fold-thrust beltsSanghoon Kwon0Gautam Mitra1Department of Earth System Sciences, Yonsei University, Seoul 120-749, Republic of KoreaDepartment of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USAThe map expression of “abrupt” changes in lateral stratigraphic level of a thrust fault has been traditionally interpreted to be a result of the presence of (1) a lateral (or oblique) thrust-ramp, or (2) a frontal ramp with displacement gradient, and/or (3) a combination of these geometries. These geometries have been used to interpret the structures near transverse zones in fold-thrust belts (FTB). This contribution outlines an alternative explanation that can result in the same map pattern by lateral variations in stratigraphy along the strike of a low angle thrust fault. We describe the natural example of the Leamington transverse zone, which marks the southern margin of the Pennsylvanian–Permian Oquirrh basin with genetically related lateral stratigraphic variations in the North American Sevier FTB. Thus, the observed map pattern at this zone is closely related to lateral stratigraphic variations along the strike of a horizontal fault. Even though the present-day erosional level shows the map pattern that could be interpreted as a lateral ramp, the observed structures along the Leamington zone most likely share the effects of the presence of a lateral (or oblique) ramp, lateral stratigraphic variations along the fault trace, and the displacement gradient.http://www.sciencedirect.com/science/article/pii/S1674987112000047Lateral stratigraphic changesFold-thrust beltTransverse zoneFrontal rampLateral rampDisplacement gradient |
| spellingShingle | Sanghoon Kwon Gautam Mitra An alternative interpretation for the map expression of “abrupt” changes in lateral stratigraphic level near transverse zones in fold-thrust belts Geoscience Frontiers Lateral stratigraphic changes Fold-thrust belt Transverse zone Frontal ramp Lateral ramp Displacement gradient |
| title | An alternative interpretation for the map expression of “abrupt” changes in lateral stratigraphic level near transverse zones in fold-thrust belts |
| title_full | An alternative interpretation for the map expression of “abrupt” changes in lateral stratigraphic level near transverse zones in fold-thrust belts |
| title_fullStr | An alternative interpretation for the map expression of “abrupt” changes in lateral stratigraphic level near transverse zones in fold-thrust belts |
| title_full_unstemmed | An alternative interpretation for the map expression of “abrupt” changes in lateral stratigraphic level near transverse zones in fold-thrust belts |
| title_short | An alternative interpretation for the map expression of “abrupt” changes in lateral stratigraphic level near transverse zones in fold-thrust belts |
| title_sort | alternative interpretation for the map expression of abrupt changes in lateral stratigraphic level near transverse zones in fold thrust belts |
| topic | Lateral stratigraphic changes Fold-thrust belt Transverse zone Frontal ramp Lateral ramp Displacement gradient |
| url | http://www.sciencedirect.com/science/article/pii/S1674987112000047 |
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