Polyphase microbreccia injectites in the Maniitsoq structure, West Greenland

A.A. Garde; B. Dyck

doi:10.1111/j.1945-5100.2011.01221.x

Abstract

In large impacts, the short-lived modification from transient cavity to final crater requires temporary strength degradation of the host rocks. Whereas the process of strength degradation is not well understood, it has been possible to model the crater reorganization observed in large impact structures by employing acoustic fluidization of 100 m-scale individual blocks. Evidence of the repeated compression and dilation that is inherent in such modeling of impact crater modification is found in a regional network of polyphase microbreccia dykes with internal dyke-in-dyke and fold structures in Archean orthogneisses in the Maniitsoq region of West Greenland (interpreted as agiant, deeply eroded Archean impact structure).

Original language	English
Article number	5258
Pages (from-to)	A74
Journal	Meteoritics and Planetary Science
Volume	46
Issue number	s1
DOIs	https://doi.org/10.1111/j.1945-5100.2011.01221.x
Publication status	Published - Jul 2011
Event	74th Annual Meeting of the Meteoritical Society - London, United Kingdom Duration: 8 Aug 2011 → 12 Aug 2011 Conference number: 74

Programme Area

Programme Area 4: Mineral Resources

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title = "Polyphase microbreccia injectites in the Maniitsoq structure, West Greenland",

abstract = "In large impacts, the short-lived modification from transient cavity to final crater requires temporary strength degradation of the host rocks. Whereas the process of strength degradation is not well understood, it has been possible to model the crater reorganization observed in large impact structures by employing acoustic fluidization of 100 m-scale individual blocks. Evidence of the repeated compression and dilation that is inherent in such modeling of impact crater modification is found in a regional network of polyphase microbreccia dykes with internal dyke-in-dyke and fold structures in Archean orthogneisses in the Maniitsoq region of West Greenland (interpreted as agiant, deeply eroded Archean impact structure).",

author = "A.A. Garde and B. Dyck",

year = "2011",

month = jul,

doi = "10.1111/j.1945-5100.2011.01221.x",

language = "English",

volume = "46",

pages = "A74",

journal = "Meteoritics and Planetary Science",

issn = "1086-9379",

publisher = "Wiley",

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note = "74th Annual Meeting of the Meteoritical Society ; Conference date: 08-08-2011 Through 12-08-2011",

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TY - JOUR

T1 - Polyphase microbreccia injectites in the Maniitsoq structure, West Greenland

AU - Garde, A.A.

AU - Dyck, B.

N1 - Conference code: 74

PY - 2011/7

Y1 - 2011/7

N2 - In large impacts, the short-lived modification from transient cavity to final crater requires temporary strength degradation of the host rocks. Whereas the process of strength degradation is not well understood, it has been possible to model the crater reorganization observed in large impact structures by employing acoustic fluidization of 100 m-scale individual blocks. Evidence of the repeated compression and dilation that is inherent in such modeling of impact crater modification is found in a regional network of polyphase microbreccia dykes with internal dyke-in-dyke and fold structures in Archean orthogneisses in the Maniitsoq region of West Greenland (interpreted as agiant, deeply eroded Archean impact structure).

AB - In large impacts, the short-lived modification from transient cavity to final crater requires temporary strength degradation of the host rocks. Whereas the process of strength degradation is not well understood, it has been possible to model the crater reorganization observed in large impact structures by employing acoustic fluidization of 100 m-scale individual blocks. Evidence of the repeated compression and dilation that is inherent in such modeling of impact crater modification is found in a regional network of polyphase microbreccia dykes with internal dyke-in-dyke and fold structures in Archean orthogneisses in the Maniitsoq region of West Greenland (interpreted as agiant, deeply eroded Archean impact structure).

U2 - 10.1111/j.1945-5100.2011.01221.x

DO - 10.1111/j.1945-5100.2011.01221.x

M3 - Abstract in journal

SN - 1086-9379

VL - 46

SP - A74

JO - Meteoritics and Planetary Science

JF - Meteoritics and Planetary Science

IS - s1

M1 - 5258

T2 - 74th Annual Meeting of the Meteoritical Society

Y2 - 8 August 2011 through 12 August 2011

ER -

Polyphase microbreccia injectites in the Maniitsoq structure, West Greenland

Abstract

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