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GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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South Africa
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Free State South Africa
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Vredefort Dome (4)
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West Africa
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Carswell Structure (1)
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Western Canada
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Chesapeake Bay impact structure (11)
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Chicxulub Crater (5)
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Commonwealth of Independent States
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Primary terms
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Africa
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West Africa
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carbon
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metasedimentary rocks (2)
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pseudotachylite (5)
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metamorphism (27)
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Mexico
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mineral resources (1)
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Guilmette Formation (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
impact breccia
Mushroom-shaped growth of crystals on the Moon Available to Purchase
The Holleford structure: Insights into the pre- and post-impact geology of the Frontenac Terrane, Canada Available to Purchase
Geochemical evidence for a chondritic impactor in altered impact glass from the Stac Fada Member impactite, NW Scotland Open Access
Ilmenite phase transformations in suevite from the Ries impact structure (Germany) record evolution in pressure, temperature, and oxygen fugacity conditions Available to Purchase
Subsolidus breakdown of armalcolite: Constraints on thermal effects during shock lithification of lunar regolith Available to Purchase
Lunar Meteorites Available to Purchase
Understanding the Ries impact structure subsurface from high-resolution seismic data Open Access
Oceanic resurge deposits at the Rochechouart impact structure (France) suggest a marine target environment Available to Purchase
X-ray computed microtomography of diamondiferous impact suevitic breccia and clast-poor melt rock from the Kara astrobleme (Pay-Khoy, Russia) Available to Purchase
Formation of the crater suevite sequence from the Chicxulub peak ring: A petrographic, geochemical, and sedimentological characterization Open Access
The Mesoproterozoic Stac Fada Member, NW Scotland: an impact origin confirmed but refined Available to Purchase
Origin and formation of Metabreccia in the Parkin Offset Dike, Sudbury impact structure, Canada Available to Purchase
Results from the first geologic traverse on the topographic rim of a complex impact crater, Endeavour Crater, Mars Available to Purchase
Explosive interaction of impact melt and seawater following the Chicxulub impact event Available to Purchase
The Apollo Sample Collection: 50 Years Of Solar System Insight Free
The Mesoproterozoic Stac Fada proximal ejecta blanket, NW Scotland: constraints on crater location from field observations, anisotropy of magnetic susceptibility, petrography and geochemistry Available to Purchase
Hydrodynamic role of groundwater in bolide impact: Evidence from the Kentland structure, Indiana, USA Available to Purchase
ABSTRACT The extremely important role of groundwater has been largely overlooked in studies of meteorite and comet impact processes. Beyond the radius of plasma generation, impacts can produce massive shattering in saturated porous rocks. Fluid pressure rise reduces rock strength and facilitates hydrofracture, to produce intraformational monomict breccias, faulting, and generation of mobile polymict breccia slurries. Decompression of a deep “transient” crater accounts for complex central uplift and gravitational collapse of tremendous slide blocks that in turn cause injection and ejection of fluidized breccia. As pore fluid pressures equilibrate, frictional strength increases, and the structural form is locked into stability. Evidence is reported here for Kentland, Indiana, where quarry rocks display relatively low pressure-temperature (elastic to ductile transition, 100 kb–100 °C) impact phases of the model of D. Stöffler. Breccias include monomict, polymict, mixed polymict-fault, and conventional fault types. The monomict breccias are associated with aquifer beds and formed by pervasive shockwave transmission on impact. Polymict breccias are derived from all rock types and formed from late stage injection-ejection pseudoviscous slurries. These processes can apply to similar impacts like Wells Creek, Flynn Creek, Decaturville, Sierra Madre, and many others.
On the backs of giants: Geology of the Kentland impact structure, Newton County (Kentland) Quarry, Indiana (USA)—Building on Ray Gutschick’s legacy Available to Purchase
“…the frustration of discovering an unusually good exposure or feature only to have it quarried or covered in succeeding weeks is disheartening. On the other hand, quarry advance enables one to project the geology from time to time, which helps one to fill in the three-dimensional puzzle.” — Gutschick (1972) ABSTRACT We summarize and then build on the three decades of geological mapping and analyses done by Ray Gutschick at the Newton County (Kentland) quarry. We present our own new data and ideas on the kinematics and significance of radial faults, shock metamorphism, petrography and diagenesis of impact breccia dikes, impactite geochemistry, and a preliminary new paleomagnetically determined Jurassic age for the crater. We list and describe the stops for this field excursion.
Revisiting the Flynn Creek impact structure, Jackson County, Tennessee Available to Purchase
ABSTRACT The Flynn Creek impact structure was originally recognized in 1968 by David Roddy as one of the original six confirmed impact structures on Earth. The Flynn Creek impact structure is also the first recognized marine-target impact structure. Exposure at Flynn Creek varies, as there is no obvious rim and the geological map of the area does not look like a crater. But, there is an impact breccia unit dominated by two classes of breccia—the lower, chaotic, slump breccia and the upper graded resurge breccia. The post-impact unit is Chattanooga Shale, of which one facies is present only in the crater itself. Participants will visit historical outcrops identified by Roddy, including both the breccia units and the central uplift. New results from ongoing reinvestigations of a drill core from Flynn Creek, as well as insight from other marine-target impact structures in the southeast, will add to lively discussions.