Pantasma - Hypervelocity Impact Crater
|Alternate Names||Valle di Santa Maria di Pantasma (Rochette et al., 2019).|
13° 22' 12" N; 85° 57' 0" W
|Apparent Crater Diameter (km)||14 km|
|Age (Ma)||0.815 ± 0.011
Advanced Data Fields
- Some of the rim remains and possible ejecta material may be preserved (Rochette et al., 2019).
- The circular structure has a diameter of ~14 km (Rochette et al., 2019).
- Located in a highly erodible and wet tropical area may have eroded the central peak, or peak is possibly buried (Rochette et al., 2019).
- The presence of former reidite phase in zircon called FRIGN zircon was detected (Cavosie et al., 2018; Rochette et al., 2019).
- Pervasive fracturing but no convincing shatter cones were observed (Rochette et al., 2019).
- Quartz fragments from possible ejecta layer are strongly deformed with numerous planar fractures (Rochette et al., 2019).
- PDFs in quartz were not identified in possible ejecta layer samples (Rochette et al., 2019).
- Coesite was identified in impact glass using Raman spectroscopy (Rochette et al., 2019).
- Polymict breccia at the centre of the structure contains altered melt fragments that broadly resemble suevite. Possible ejecta layer contains Palaeozoic rocks which would have originated hundreds of metres below the surface (Rochette et al., 2019).
(2018) Former reidite in granular neoblastic zircon (FRIGN zircon) from the Luizi impact structure and proposed Pantasma structure, 49th Lunar and Planetary Science Conference, p. Abstract 1816, Lunar and Planetary Science Conference, Houston, TX
(2018) FRIGN zircon—The only terrestrial mineral diagnostic of high-pressure and high-temperature shock deformation, Geology 46(10), p. 891-894, Geological Society of America, doi:10.1130/G45079.1
(2019) Pantasma: Evidence for a pleistocene circa 14 km diameter impact crater in Nicaragua, Meteoritics and Planetary Science 901(4), p. 880-901, doi:10.1111/maps.13244