Shock deformation in zircon grains from the Mien impact structure, Sweden
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Shock deformation in zircon grains from the Mien impact structure, Sweden. / Martell, Josefin; Alwmark, Carl; Holm-Alwmark, Sanna; Lindgren, Paula.
I: Meteoritics and Planetary Science, Bind 56, Nr. 2, 12.02.2021, s. 362-378.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Shock deformation in zircon grains from the Mien impact structure, Sweden
AU - Martell, Josefin
AU - Alwmark, Carl
AU - Holm-Alwmark, Sanna
AU - Lindgren, Paula
PY - 2021/2/12
Y1 - 2021/2/12
N2 - Recognition of impact-induced deformation of minerals is crucial for the identification and confirmation of impact structures as well as for the understanding of shock wave behavior and crater formation. Shock deformed mineral grains from impact structures can also serve as important geochronometers, precisely dating the impact event. We investigated zircon grains from the Mien impact structure in southern Sweden with the aim of characterizing shock deformation. The grains were found in two samples of impact melt rock with varying clast content, and in one sample of suevitic breccia. We report the first documentation of so-called "FRIGN zircon" (former reidite in granular neoblastic zircon) from Mien (pre-erosion diameter 9 km), which confirms that this is an important impact signature also in relatively small impact structures. Furthermore, the majority of investigated zircon grains contain other shock-related microtextures, most notably granular and microporous textures, that occur more frequently in grains found in the impact melt than in the suevitic breccia. Our findings show that zircon grains that are prime candidates for establishing a new and improved age refinement of the Mien impact structure are present in the impact melt.
AB - Recognition of impact-induced deformation of minerals is crucial for the identification and confirmation of impact structures as well as for the understanding of shock wave behavior and crater formation. Shock deformed mineral grains from impact structures can also serve as important geochronometers, precisely dating the impact event. We investigated zircon grains from the Mien impact structure in southern Sweden with the aim of characterizing shock deformation. The grains were found in two samples of impact melt rock with varying clast content, and in one sample of suevitic breccia. We report the first documentation of so-called "FRIGN zircon" (former reidite in granular neoblastic zircon) from Mien (pre-erosion diameter 9 km), which confirms that this is an important impact signature also in relatively small impact structures. Furthermore, the majority of investigated zircon grains contain other shock-related microtextures, most notably granular and microporous textures, that occur more frequently in grains found in the impact melt than in the suevitic breccia. Our findings show that zircon grains that are prime candidates for establishing a new and improved age refinement of the Mien impact structure are present in the impact melt.
KW - U-PB
KW - HIGH-PRESSURE
KW - GRANULAR ZIRCON
KW - LOW-TEMPERATURE
KW - METAMORPHISM
KW - REIDITE
KW - QUARTZ
KW - CRATER
KW - AGES
KW - MICROSTRUCTURES
U2 - 10.1111/maps.13625
DO - 10.1111/maps.13625
M3 - Journal article
VL - 56
SP - 362
EP - 378
JO - Meteoritics and Planetary Science
JF - Meteoritics and Planetary Science
SN - 1086-9379
IS - 2
ER -
ID: 258662588