Feather features: A low-shock-pressure indicator in quartz

Feather Textures – a Possible Shock Feature in Quartz Diagnostic of Low Shock

The term " feather textures " describes an unusual type of pla-nar microdeformation structure, which has been found in shocked quartz grains in several confirmed impact craters. These features were first described in detail by [1,2], although, to the best of our knowledge they were first reported by [3]. Feather textures consist of a planar fracture (" P1 " in [1,2]) from which a group of thinl...

Experimental Shock Transformation of Gypsum to Anhydrite: a New Low Pressure Regime Shock Indicator

Comparison of Low-pressure Shock-metamorphic Effects in Quartz from Barringer Crater, Arizona, and Kentland Dome, Indiana

Introduction: The recognition of low-pressure shock-metamorphic effects in quartz is of increasing importance in studies attempting to verify an impact origin for highly eroded structures [1], recognize sedi-mentary-target impacts characterized by a wide range of shock-pressure regimes, and identify distal impact-ejecta layers or impact-tsunamiites where high-pressure indicators may be rare or ...

Observation of Quartz Cathode-Luminescence in a Low Pressure Plasma Discharge

Shock - Induced Transition of Quartz to Stishovite

The transformation of quartz to stishovite has been studied by X-ray and optical examination of a series of experimentally shock-loaded specimens of a quartz-copper mixture. Shock pressures of 68 to 260 kb and peak temperatures of 320 ø to 870øK wer e achieved. Stishovite was identified from quartz shock-loaded above 90 kb; the quantity increases with increasing pressure, but is not dependent o...