Last edited by Galabar
Tuesday, October 20, 2020 | History

4 edition of Breccia formation at a complex impact crater found in the catalog.

Breccia formation at a complex impact crater

Breccia formation at a complex impact crater

Slate Islands, Lake Superior, Ontario, Canada

  • 212 Want to read
  • 6 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Archipelagoes,
  • Breccia,
  • Craters,
  • Meteorite craters,
  • Metamorphic rocks,
  • Igneous rocks

  • Edition Notes

    Other titlesSlate Islands, Lake Superior, Ontario, Canada.
    StatementB.O. Dressler, V.L. Sharpton.
    Series[NASA contractor report] -- NASA/CR-207774., NASA contractor report -- NASA CR-207774.
    ContributionsSharpton, Virgil L., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17839130M
    OCLC/WorldCa40390261

    Ten samples from three impact craters were analyzed for the pres-ence of C These include seven impact breccias from the “Black Member” of the Onaping Formation in Sudbury (the location of re-ported fullerenes), a suevite breccia and a black-matrix breccia from the Gardnos impact site, and a suevite from the Ries crater. Sudbury. During the final modification phase, the remainder of ejecta partially refills and rings the crater site, and debris forms a rich mineral composite called breccia. Larger, more forceful impact events will form complex craters in which the rock at the center of the crater rebounds from the downward pressure of the shock wave and uplifts into a.

    Dressler BO, Sharpton VL () Breccia formation at a complex impact crater: Slate Islands, Lake Superior, Ontario, Canada. Tectonophysics – CrossRef Google Scholar French BM, Nielsen RL () Vredefort bronzite granophyre: chemical evidence for origin as meteoritic impact melt. The largest impact in recent history. Air burst of comments of asteroids; no crater was found, trees scorched land flattened over sq. ft.

    Occasionally you'll see a fragment of gneiss that was excavated from 2 kilometers below the pre-impact surface, then brought to the surface, and mixed in with other rock fragments to form this new rock: impact melt breccia. This type of rock forms the crater-fill deposits at the Haughton impact structure. See impact melt breccias in the. Breccia dikes and crater-related faults in impact craters on Mars width with increasing distance from the crater center, 3) flow bulges with greatest thicknesses at nodular points, marking branch points where the dike bifurcates in two or more directions, 4) all forming a .


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Breccia formation at a complex impact crater Download PDF EPUB FB2

A central-peak crater is the most basic form of complex crater. A central peak crater can have a tightly spaced, ring-like arrangement of peaks, thus be a peak ring crater, though the peak is often single.

Central-peak craters can occur in impact craters, via Earthly example is Mistastin crater, in Canada. They also occur due to volcanism, as in Valles Caldera.

TECTONOPHYSICS I ELSEVIER Tectonophysics () Breccia formation at a complex impact crater: Slate Islands, Lake Superior, Ontario, Canada B.O. Dressier *, V.L. Sharpton Lunar and Planetary Institute, Bay Area Boulevard, Houston, TXUSA Received 21 May ; accepted 6 January Abstract The Slate Islands impact structure is the eroded remnant of a ~30 Cited by: Breccia (/ ˈ b r ɛ tʃ i ə / or / ˈ b r ɛ ʃ i ə /) is a rock composed of broken fragments of minerals or rock cemented together by a fine-grained matrix that can be similar to or different from the composition of the fragments.

The word has its origins in the Italian language, in which it means either "loose gravel" or "stone made by cemented gravel". A breccia may have a variety of. An impact crater is an approximately circular depression in the surface of a planet, moon, or other solid body in the Solar System or elsewhere, formed by the hypervelocity impact of a smaller body.

In contrast to volcanic craters, which result from explosion or internal collapse, impact craters typically have raised rims and floors that are lower in elevation than the surrounding terrain.

Full text of "Breccia Formation at a Complex Impact Crater: Slate Islands, Lake Superior, Ontario, Canada" See other formats NASA/CR— / ^ c^y 2(fm^ ntsprinted from / TECTONOPHYSICS INTERNATIONAL JOURNAL OF GEOTECTONICS AND THE GEOLOGY AND PHYSICS OF THE INTERIOR OF THE EARTH Tectonophysics () 1 Breccia formation at a complex impact crater:.

Get this from a library. Breccia formation at a complex impact crater: Slate Islands, Lake Superior, Ontario, Canada. [Burkhard O Dressler; Virgil L Sharpton; United.

EDUCATORS. Click here to submit a request to borrow an impact rock kit which includes this impact rock. A breccia (Latin word meaning “broken”), in general, is a rock that is a mixture of angular fragments from different types of rocks surrounded by a fine-grained "matrix" that may be similar to or different from the fragmented as can be formed in many different geologic.

Impact breccia dikes form when brecciated target material, or angular clasts of country rock, is injected into crater-related faults during the excavation stage of an impact (Head and Mustard. Monomict impact breccia in the Manicouagan Impact Crater.

In this image are original blocks of country rock within the impact melted country rock forming impact breccia. BRECCIA POLYMICT. Polymict breccia is a general term that encompasses all breccias that aren’t either monomict or dimict.

For larger craters, the impact structure is gravitationally unstable and its modification stage will include uplift of the crater floor and collapse of the unstable steep walls (slumping).

These movements will be completed in a few minutes and could result in a complex or multi-ring crater. Breccia Breccia is a rock There are several modes of formation for breccia. Some represent consolidated material accumulated on steep hill slopes or at the foot of cliffs.

Impact breccias are formed when a meteor impacts the Earth's surface, fracturing rock at the site of the impact. The cement that binds the clasts in a breccia is. Shock-Metamorphosed Rocks (Impactites) in Impact Structures61 61 ROCK TYPES IN THE FINAL IMPACT STRUCTURE A wide variety of distinctive rock types — breccias, melts, and shock-metamorphosed target rocks — are produced during formation of impact structures.

The classification of these complex and diverse rocks is an active and much. Breccia sample returned from the Moon by Apollo 15 astronauts in This sample was found at Spur Crater at the foot of the Apennine range near the Mare Imbrium.

It is composed of broken and shock-altered fragments that were fused together after an impact of a large object created the Imbrium Basin.

NASA/Lunar Planetary Institute. Clasts from suevitic breccia selected for this study come from the LBA and LBA cores that are located within the crater and represent fallback breccia (e.g., [7]). Breccia is commonly used for clastic sedimentary rocks composed of large sharp-angled fragments embedded in a fine-grained matrix of smaller particles or mineral cement.

The breccia generated by folding, faulting, magmatic intrusions, and similar forces is called tectonic tectonic breccia zones are represented by crush, rubble, crackle, and shatter rock mass.

Impact cratering hsu = D () where all distances are in kilometers. the diameter of the central peak complex is roughly 22% of the inal rim-to-rim. The formation, morphology, and economic potential of meteorite impact craters Hans-Henrik Westbroek and Robert R.

Stewart the mechanics of crater formation itself may be conducive to economic material accumulation. When one the transient crater diameter widens by nearly 20% to the final crater diameter. The breccia lens itself tends to. When in the sixties/seventies the Ries crater proved to be a Tertiary large impact structure the suevite “metamorphosed” to a seemingly unique shocked impact breccia.

But soon it became evident that a suevite is a quite common impactite in impact structures all over the world. On impact, the cavity reaches a maximum depth of km, with the transient crater forming after only 2 minutes (the transient crater volume is ~25% that of the impact into the Moon).

During crater collapse, the central uplift reaches a lower maximum height than the equivalent impact on the Moon and also involves the overturn of less crustal. Introduction. A breccia is a clastic sedimentary rock composed of angular clasts in a consolidated matrix.

Breccias can be produced in several geologic processes: tectonic breccia, volcanic breccia (eruption breccia, vent breccia), sedimentary breccia (e.g., rock fall breccia), collapse breccia (e.g., in karst areas). Dressler BO, Sharpton VL () Breccia formation at a complex impact crater: Slate Islands, Lake Superior, Ontario, Canada.

Tectonophysics – CrossRef Google Scholar Erismann ThH, Abele G () Dynamic of Rockslides and Rockfalls, Springer-Verlag Berlin-Heidelberg-New York, pp. 32–48 Google Scholar.The Late Devonian Alamo Breccia is one of the largest impactogenic stratigraphic intervals discovered on Earth.

The Breccia represents diverse and complex large-scale impact-deformed bedrock, ejecta, and reworked debris exposed in 25 or more mountain ranges across present-day southern Nevada and western s facies of Alamo Breccia are conservatively calculated to occupy an area of.Popigai Breccia: A large gram specimen of breccia from the massive Popigai crater in northern Siberia.

Note the variety of colors, sizes, shapes and textures within a single mass—the result of a major meteorite impact which threw millions of tons of rock into the air.