Letter. Lightning-induced shock lamellae in quartz

  title={Letter. Lightning-induced shock lamellae in quartz},
  author={Reto Gier{\'e} and Wolfhard Wimmenauer and Hiltrud M{\"u}ller-Sigmund and Richard Wirth and Gregory R. Lumpkin and Katherine L. Smith},
  journal={American Mineralogist},
  pages={1645 - 1648}
Abstract Using transmission electron microscopy we show that planar deformation lamellae occur within quartz in the substrate of a rock fulgurite, i.e., a lightning-derived glass. These lamellae exist only in a narrow zone adjacent to the quartz/fulgurite boundary and are comparable to planar deformation features (“shock lamellae”) caused by hypervelocity impacts of extra-terrestrial objects. Our observations strongly suggest that the lamellae described here have been formed as a result of the… Expand

Tables from this paper

Generation of shock lamellae and melting in rocks by lightning-induced shock waves and electrical heating
The very rapid energy release from impact events, such as those resulting from lightning strikes or meteorites, can drive a variety of physical and chemical processes which alter rocks and result inExpand
Influence of shock propagation on lightning evidence in volcanic ashfall deposits
Abstract Lightning-induced textures in volcanic ashfall deposits can take several forms, including lightning-induced volcanic spherules (LIVS), spherule aggregates, and pumiceous particles. Here, twoExpand
The response of zircon to the extreme pressures and temperatures of a lightning strike.
Zircon dissociation to ZrO2 and SiO2 is a high-temperature, relatively low-pressure phenomenon, consistent with previous suggestions that lightning strikes involve extreme temperatures as well as pressures greater than those usually generated in Earth's crust but rarely > 10 GPa. Expand
Mineralogical and compositional features of rock fulgurites: A record of lightning effects on granite
Abstract Fulgurites are a naturally occurring glass formed when sand, rock, or soil is struck by atmospheric electrical discharges (lightning). The aim of this paper is to provide insights into theExpand
Oxidation state of iron in fulgurites and Trinitite: Implications for redox changes during abrupt high-temperature and pressure events
Abstract Understanding the geochemical effects of shock metamorphism that occur on planetary surfaces is critical when using potentially shocked planetary samples. Fulgurites, formed by lightningExpand
Impact geologists, beware!
Impact geologists have long assumed that shock metamorphic features, such as planar fractures and Planar Deformation Features (PDFs) in quartz are reliable indicators of an extraterrestrial impact. AExpand
The forensics of fulgurite formation
Natural disasters such as forest fires can result in extensive and costly property damage. These events may be the result of a human error or system failure triggered by electrical discharge, and inExpand
Electric Discharge-Not an Impact Caused Formation Of Upheaval Dome, Canyonlands National Park, Utah
This paper will provide an argument that Upheaval Dome, Canyonlands National Park, Utah, USA is a product of Electrical Discharge Machining (EDM). Currently two theories remain from a myriad ofExpand
Effects of Lightning on the Magnetic Properties of Volcanic Ash
High-current impulse experiments were performed on volcanic ash samples to determine the magnetic effects that may result from the occurrence of volcanic lightning during explosive eruptions, finding that the saturation (i.e., maximum possible) magnetization increased, and coercivity decreased. Expand
The occurrence of iron silicides in a fulgurite: Implications for fulgurite genesis
Rapidly formed eutectic textures are observed in Fe silicides in a fulgurite from Michigan. The 14 cm-diameter fulgurite was formed in sandy glacial till in 2014 near Houghton Lake, Michigan.Expand


Lightning Strike Fusion: Extreme Reduction and Metal-Silicate Liquid Immiscibility
Thermodynamic calculations indicate that temperatures in excess of 2000 K and reducing conditions approaching those of the SiO2-Si buffer were needed to form the coexisting metallic and silicate liquids. Expand
Planar deformation features in shocked quartz; a transmission electron microscopy investigation
Abstract We present a detailed investigation by transmission electron microscopy (TEM) of the fine structure of planar deformation features (PDF) in quartz grains within which shock metamorphism hasExpand
Shock Metamorphism of Minerals
The hypervelocity impact of extraterrestrial objects causes unequivocal changes in the target due to extreme deformation rates, pressures up to hundreds of gigapascals, and postshock temperaturesExpand
Shock metamorphism of quartz in nature and experiment: II. Significance in geoscience*
— The occurrence of shock metamorphosed quartz is the most common petrographic criterion for the identification of terrestrial impact structures and lithologies. Its utility is due to its almostExpand
Shock metamorphism of quartz in nature and experiment: I. Basic observation and theory*
Abstract— Quartz, as a ubiquitous mineral constituent of the Earth's crust, displays the greatest variety of well-defined residual shock effects among all rock-forming minerals. It represents anExpand
Mechanical twinning in quartz: Shock experiments, impact, pseudotachylites and fault breccias
Abstract Increasing use of diffraction methods to study preferred orientation of minerals has established that quartz in deformed rocks not only displays characteristic c-axis orientation patterns,Expand
Deformation and transformation in experimentally shock-loaded quartz
AbstractSingle crystals of quartz, shock-loaded along the a axis to pressures of 22 Gpa, 24 GPa, 26 GPa and 30 GPa were examined by high-voltage transmission electron microscopy (TEM), scanningExpand
Shocked quartz in Sahara fulgurite
Comparative strain analyses were performed on quartz crystals within a Sahara fulgurite using neutron diffraction experiments. Besides, 3D-μXRCT (three-dimensional micro X-ray computed tomography)Expand
Unusual features caused by lightning impact in West Greenland
Two lightning impacts are described from an area near the Inland Ice in West Greenland. The first lightning blasted an outcrop of metacherts. It subsequently split into two branches, which traversedExpand
The fulgurite of Torre de Moncorvo (Portugal): description and analysis of the glass
The fulgurite of Torre de Moncorvo (Portugal) was formed by lightning striking a small electricity pylon; it consists morphologically of a central cylinder with radial ramifications several metresExpand