brecciation

The severe brecciation of most aubrites attests to a violent history for their parent body.

Another explanation would be an isotopic contamination of the Martian crust during impact brecciation.

They show signs of metamorphism, partial melting, brecciation and relic chondrules.

"Impact brecciation has metamorphosed it," Spencer said, inspecting the stone when it came back to him.

Pervasive alteration, brecciation and fumarolic activity (elevation 910m).

It is doubtful that any primary crustal material has been preserved without brecciation and redistribution by repeated impacts.

Instead, regolith evolution is dominated by brecciation and subsequent mixing of bright and dark components.

The impact brecciation had created all kinds of useful metamorphic rock, and greenhouse-gas minerals were a common secondary find throughout the apron.

In all cases except brecciation, therefore, a vein measures the plane of extension within the rock mass, give or take a sizeable bit of error.

These events caused a variety of effects, ranging from simple compaction to brecciation, veining, localized melting, and formation of high-pressure minerals.

Some of the clasts in these breccias are pieces of older breccias, documenting a repeated history of impact brecciation, cooling, and impact.

The geological history of Benton has four stages: chondrule formation and accumulation, brecciation, thermal metamorphism and finally shock vein formation.

The rocks are mainly degraded basalts with a variety of textures indicating severe fracturing and brecciation from impact and alteration by hydrothermal fluids.

Kilmelford - porphyritic, calc-alkaline granodiorite intrusions of Caledonian age with zones of hydrothermal alteration, brecciation and disseminated sulphides.

(2001) "Early tectonic dewatering and brecciation on the overturned sequence at Marble Bar, Pilbara Craton, Western Australia: dome-related or not?"

Within the depth range of 5-10 km pseudotachylite is formed, as the confining pressure is enough to prevent brecciation and milling and thus energy is focused into discrete fault planes.

Subsequent dissolution of these salts caused collapse (brecciation) of the overlying Magnesian Limestone rock layers that predominantly make up the cliffs today, providing much of their distinctive appearance and properties.

Barrowʼs description of the structural nature of the rocks along the Highland Border suggests that rocks along both ends of the fault plane are indistinguishable from one another, with no brecciation.

Fault breccias have been further classified in terms of their origins; attrition, distributed crush and implosion brecciation, and, borrowing from the cave-collapse literature, crack, mosaic and chaotic from their clast concentration.

This appears to be made up largely of vugs and fractures, although it is not clear whether the 'vugs' have originated from leaching of evaporites or by brecciation of the carbonates (Pennington 1975).

The structure consists of an area of severe structural deformity and extensive brecciation that was poorly understood and had been thought to be the result of either thrusting over a dome or a cryptoexplosive event.

The high crater density of intercrater and intermediate plains materials makes it likely, however, that the original rock types of these two units (whether basalt, impact melt, or impact breccia) were modified considerably by further brecciation following emplacement.

The amount of shock metamorphism in the rocks progresses in stages with the amount of pressure that they were exposed to, ranging from fracturing and brecciation to vaporization of the rocks and later condensation into glass.