Characteristics of shocked quartz in late Eocene impact ejecta from Massignano (Ancona, Italy): Clues to shock conditions and source crater

Abstract

Research Article| June 01, 1996 Characteristics of shocked quartz in late Eocene impact ejecta from Massignano (Ancona, Italy): Clues to shock conditions and source crater Falko Langenhorst Falko Langenhorst 1Institut für Mineralogie, Museum für Naturkunde, Humboldt-Universität zu Berlin, Invalidenstrasse 43, D-10115, Berlin, Germany, and Institut für Planetologie, Westfäl Wilhelms-Universität, Wilhelm-Klemm-Strasse 10, D-48149 Münster, Germany Search for other works by this author on: GSW Google Scholar Geology (1996) 24 (6): 487–490. https://doi.org/10.1130/0091-7613(1996)024<0487:COSQIL>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Falko Langenhorst; Characteristics of shocked quartz in late Eocene impact ejecta from Massignano (Ancona, Italy): Clues to shock conditions and source crater. Geology 1996;; 24 (6): 487–490. doi: https://doi.org/10.1130/0091-7613(1996)024<0487:COSQIL>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The microstructure and optical properties of shocked quartz, discovered in a distal ejecta horizon of the stratigraphically continuous upper Eocene section at Massignano, Italy, have been investigated in detail. The microstructural observations confirm the impact origin of the shocked quartz grains and reveal that the optically visible planar lamellae are well-preserved, amorphous to partially recrystallized planar deformation features. Refractive index measurements of shocked quartz and analysis of the orientation and thickness of planar deformation features indicate shock pressures of 10 to 26 GPa at ambient preshock temperature. Altogether, the characteristics of shocked quartz from Massignano imply a nonporous, quartz-rich near-surface rock as its source. Popigai, Russia, is favored as the source crater because of the presence of compact quartzites in its preimpact cover. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.