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Diques clásticos asociados a deformación transcurrente en depósitos sinorogénicos del Mioceno inferior de la Cuenca Austral
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ghiglione, Matías C. |
| Copyright Year | 2002 |
| Abstract | Clastic dykes associated with strike-slip deformation, in synorogenic deposits from the Early Miocene of the Austral basin. Clastic dykes occur commonly within Early Miocene sediments of the Austral or Magallanes basin, in the central part of Tierra del Fuego, Argentina. The orientation, thickness and spacing of the clastic dykes along the Atlantic coast in the vacinity of Cabo San Pablo and Cabo Viamonte are examined. Sheet intrusions, especially dykes unaffected by previous structures, should have an orientation perpendicular to the least compressive stress (sigma 3). Consequently, the orientation of clastic dykes has been used to calculate sigma 3 distribution at the time of intrusion. These sigma 3 directions, as well as geological structures, are used to infer the maximum and intermediate compressive stresses (sigma 1 and 2, respectively) at the time of intrusion. In the Cabo San Pablo sector, the strain ellipse so obtained defines a strike-slip system, with sigma 1 and 3 horizontal and sigma 2 vertical. The clastic dykes were generated during Early Miocene sediment deposition, in two distinct strike-slip tectonic pulses that affected the Austral basin. Thus, a tectonic evolution based on strike-slip displacement of the Austral basin during the Early Miocene is proposed. |
| Starting Page | 103 |
| Ending Page | 118 |
| Page Count | 16 |
| File Format | PDF HTM / HTML |
| Volume Number | 57 |
| Alternate Webpage(s) | http://www.scielo.org.ar/pdf/raga/v57n2/v57n2a01.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
