Ιδρυματικό Αποθετήριο
Πολυτεχνείο Κρήτης
Πολυτεχνείο Κρήτης
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| URI | http://purl.tuc.gr/dl/dias/B67157F9-3109-4379-93CB-9A098ED40519 | - |
| Αναγνωριστικό | https://doi.org/10.3390/geosciences13120363 | - |
| Αναγνωριστικό | https://www.mdpi.com/2076-3263/13/12/363 | - |
| Γλώσσα | en | - |
| Μέγεθος | 23 pages | en |
| Τίτλος | The Mahout structure in the central desert of Oman: a possible simple impact crater | en |
| Δημιουργός | Nasir Sobhi | en |
| Δημιουργός | Oikonomou Nikolaos | en |
| Δημιουργός | Οικονομου Νικολαος | el |
| Δημιουργός | Al Hooti Khalil | en |
| Δημιουργός | Al Hosni Talal | en |
| Δημιουργός | Spratley Sean | en |
| Δημιουργός | Spratley Brian | en |
| Εκδότης | MDPI | en |
| Περίληψη | The present work reports on the first evidence of a possible hypervelocity impact crater in the Sultanate of Oman. The impact origin of the structure is determined based on field observations, microscopic observations of shatter cones, planar fractures (PFs) and feather features (FFs) in quartz, calcite, and feldspar, and melt-bearing polymict breccias with various types of melts. The structure consists of an elliptical bowl-shaped ridge 750 m long and 550 m wide, oriented roughly north-northeast to south-southwest. The elliptical shape and relief asymmetry indicate an oblique collision. The precursor target lithologies include local late Proterozoic Masirah Bay siliciclastic formations, carbonate and acidic volcanic rocks of the late Precambrian Halfayn Formation, and basement rocks. The crater rim, up to 15–20 m above ground, is composed of quartzite, jasper, agate, monomict siliceous and hematite breccia, and metamorphosed shale (hornfels). An ejecta blanket composed of target rocks covers the floor, outer rim, and the area extending to the immediate northeast and east of the structure. Quaternary aeolian sand covers most of the crater surface, including the 1 to 2 m thick melt-rich polymict breccia found in the crater center. The planar fractures (PFs) and feather features (FFS) in quartz and feldspar suggest a low shock pressure between 5 and 14 GPa. Our observations are consistent with set criterions for impact crater identification, confirming the possible impact origin of the Mahout structure. | en |
| Τύπος | Peer-Reviewed Journal Publication | en |
| Τύπος | Δημοσίευση σε Περιοδικό με Κριτές | el |
| Άδεια Χρήσης | http://creativecommons.org/licenses/by/4.0/ | en |
| Ημερομηνία | 2025-04-24 | - |
| Ημερομηνία Δημοσίευσης | 2023 | - |
| Θεματική Κατηγορία | Mahout structure | en |
| Θεματική Κατηγορία | Oman | en |
| Θεματική Κατηγορία | Impact crater | en |
| Θεματική Κατηγορία | Polymict breccia | en |
| Θεματική Κατηγορία | Deformation features | en |
| Θεματική Κατηγορία | Shock metamorphism | en |
| Βιβλιογραφική Αναφορά | S. Nasir, N. Economou, K. Al Hooti, T. Al Hosni, S. Spratley and B. Spratley, “The Mahout structure in the central desert of Oman: a possible simple impact crater,” Geosciences, vol. 13, no. 12, Nov. 2023, doi: 10.3390/geosciences13120363. | en |
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