1992
DOI: 10.1130/spe293-p331
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Sudbury Igneous Complex: Impact melt or endogenous magma? Implications for lunar crustal evolution

Abstract: If the Sudbury Igneous Complex is a differentiated impact melt, then currently favored views of how the Moon's crust formed may be wrong. The lunar highlands crust is thought to comprise a diverse array of magmatic cumulates, but the primary record of lunar crustal evolution has been obscured by intensive impact brecciation, melting, and mixing. Based on the petrologic and geochemical characteristics of terrestrial impact deposits, criteria have been developed to help distinguish primary lunar crustal rocks fr… Show more

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Cited by 9 publications
(4 citation statements)
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“…This conclusion was based primarily on (1) observations that terrestrial impact melt products tend to be chemically homogeneous (Phinney and Simonds, 1977;Grieve and Floran, 1978) and 2an inference that thorough mixing with, and digestion of, cooler clastic debris causes impact melts to cool too rapidly for significant differentiation (Simonds et al, 1976;Onorato et al, 1978). Also supporting this interpretation, the relatively few lunar rocks with preserved coarse cumulate textures tend to be vastly more compositionally diverse than fine-grained, siderophilerich lunar rocks of obvious impact melt derivation (e.g., Warren and Wasson, 1977;Norman, 1994b). Some skepticism persists (Delano and Ringwood, 1978), but for most of the past two decades it has been widely assumed that even basin-scale impact melts do not undergo significant igneous differentiation (e.g., Simonds et al, 1976;Spudis and Ryder, 1981;Lindstrom et al, 1990).…”
Section: Introductionmentioning
confidence: 95%
See 1 more Smart Citation
“…This conclusion was based primarily on (1) observations that terrestrial impact melt products tend to be chemically homogeneous (Phinney and Simonds, 1977;Grieve and Floran, 1978) and 2an inference that thorough mixing with, and digestion of, cooler clastic debris causes impact melts to cool too rapidly for significant differentiation (Simonds et al, 1976;Onorato et al, 1978). Also supporting this interpretation, the relatively few lunar rocks with preserved coarse cumulate textures tend to be vastly more compositionally diverse than fine-grained, siderophilerich lunar rocks of obvious impact melt derivation (e.g., Warren and Wasson, 1977;Norman, 1994b). Some skepticism persists (Delano and Ringwood, 1978), but for most of the past two decades it has been widely assumed that even basin-scale impact melts do not undergo significant igneous differentiation (e.g., Simonds et al, 1976;Spudis and Ryder, 1981;Lindstrom et al, 1990).…”
Section: Introductionmentioning
confidence: 95%
“…Thus, the SIC has recently been interpreted as a product of igneous differentiation (i.e., fractional crystallization) of a large mass of impact melt, with negligible addition of endogenously derived magma (Grieve et al, 1991;Avermann et al, 1992). This interpretation is still very controversial (e.g., Chai and Eckstrand, 1993;Norman, 1994b).…”
Section: Introductionmentioning
confidence: 99%
“…More recent geochemical studies (Chai and Eckstrand, 1993a,b;Norman, 1994), in situ magmatic fractionation modeling of the SIC (Ariskin, 1997), field observations (Dressler et al, 1996), and radiometric data from the Sublayer (Corfu and Lightfoot, 1996) cast doubt on the validity of the impact melt model for all or part of the SIC. However, geochemical and impact theoretical arguments in support for the entire SIC as an impact melt are nevertheless favored by many workers (e.g., Grieve et al, 1993;Deutsch and Grieve, 1994;Grieve, 1994;Deutsch et al, 1995;Ostermann and Deutsch, 1997).…”
Section: Introductionmentioning
confidence: 97%
“…Deutsch (1994) interpreted isotopic ratio data for the SIC, suevitic breccias, and country rocks as indicating that the SIC was entirely an impact melt sheet, although he acknowledged that his principal argument that no mantle-derived melt was involved relied on the difficulty that such a melt would have in assimilating the required 50%+ of crustal rocks required to account for the isotopic data. Norman (1994) noted that the composition of the SIC is very similar to that of lunar samples, which previously had been interpreted as primary, not impact, melts, and which had, therefore been used to give insight into the thermal history of the Moon. Norman pointed out that if the SIC is an impact melt, the lunar samples could also be impact in origin, with no relevance to the Moon's thermal evolution.…”
Section: Crust As Increasing Amounts Of Felsic Melt Derived From Thementioning
confidence: 93%