Identification of a meteoritic component using chromium isotopic composition of impact rocks from the Lonar impact structure, India
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Identification of a meteoritic component using chromium isotopic composition of impact rocks from the Lonar impact structure, India. / Mougel, Berengere; Moynier, Frederic; Koeberl, Christian; Wielandt, Daniel; Bizzarro, Martin.
I: Meteoritics and Planetary Science, Bind 54, Nr. 10, 01.10.2019, s. 2592-2599.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Identification of a meteoritic component using chromium isotopic composition of impact rocks from the Lonar impact structure, India
AU - Mougel, Berengere
AU - Moynier, Frederic
AU - Koeberl, Christian
AU - Wielandt, Daniel
AU - Bizzarro, Martin
PY - 2019/10/1
Y1 - 2019/10/1
N2 - The existence of mass-independent chromium isotope variability of nucleosynthetic origin in meteorites and their components provides a means to investigate potential genetic relationship between meteorites and planetary bodies. Moreover, chromium abundances are depleted in most surficial terrestrial rocks relative to chondrites such that Cr isotopes are a powerful tool to detect the contribution of various types of extra-terrestrial material in terrestrial impactites. This approach can thus be used to constrain the nature of the bolide resulting in breccia and melt rocks in terrestrial impact structures. Here, we report the Cr isotope composition of impact rocks from the ~0.57 Ma Lonar crater (India), which is the best-preserved impact structure excavated in basaltic target rocks. Results confirm the presence of a chondritic component in several bulk rock samples of up to 3%. The impactor that created the Lonar crater had a composition that was most likely similar to that of carbonaceous chondrites, possibly a CM-type chondrite.
AB - The existence of mass-independent chromium isotope variability of nucleosynthetic origin in meteorites and their components provides a means to investigate potential genetic relationship between meteorites and planetary bodies. Moreover, chromium abundances are depleted in most surficial terrestrial rocks relative to chondrites such that Cr isotopes are a powerful tool to detect the contribution of various types of extra-terrestrial material in terrestrial impactites. This approach can thus be used to constrain the nature of the bolide resulting in breccia and melt rocks in terrestrial impact structures. Here, we report the Cr isotope composition of impact rocks from the ~0.57 Ma Lonar crater (India), which is the best-preserved impact structure excavated in basaltic target rocks. Results confirm the presence of a chondritic component in several bulk rock samples of up to 3%. The impactor that created the Lonar crater had a composition that was most likely similar to that of carbonaceous chondrites, possibly a CM-type chondrite.
U2 - 10.1111/maps.13312
DO - 10.1111/maps.13312
M3 - Journal article
AN - SCOPUS:85067388735
VL - 54
SP - 2592
EP - 2599
JO - Meteoritics and Planetary Science
JF - Meteoritics and Planetary Science
SN - 1086-9379
IS - 10
ER -
ID: 230201773