Compositional evolution of the protoplanetary disk: Oxygen isotopes of type-II chondrules from CR2 chondrites

Harold C. Connolly; Gary R. Huss

doi:10.1016/j.gca.2010.01.005

Compositional evolution of the protoplanetary disk: Oxygen isotopes of type-II chondrules from CR2 chondrites

Harold C. Connolly, Gary R. Huss

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Abstract

Chondrules are the dominant component of chondritic meteorites and attest to high-temperature transient heating events within the protoplanetary disk. They provide valuable constraint on the disk environments in which they formed and potentially the evolution of primitive planetary materials in the disk. The oxygen isotopic composition of CR2 chondrite type-II chondrules was investigated. Our data show significant variation in the isotopic compositions of the chondrules with no petrographic or geochemical means to identify what chondrule will plot where on a three-isotope diagram. Although we cannot rule out that these chondrules may have come from another chondrite-forming region, we argue in context of type-I chondrules from CR2 chondrites that CR2 type-II chondrules record changes in solid and gas composition during formation due to the vaporization of icy bodies in localized regions of the inner disk.

Original language	English (US)
Pages (from-to)	2473-2483
Number of pages	11
Journal	Geochimica et Cosmochimica Acta
Volume	74
Issue number	8
DOIs	https://doi.org/10.1016/j.gca.2010.01.005
State	Published - Apr 15 2010
Externally published	Yes

All Science Journal Classification (ASJC) codes

Geochemistry and Petrology

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10.1016/j.gca.2010.01.005

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title = "Compositional evolution of the protoplanetary disk: Oxygen isotopes of type-II chondrules from CR2 chondrites",

abstract = "Chondrules are the dominant component of chondritic meteorites and attest to high-temperature transient heating events within the protoplanetary disk. They provide valuable constraint on the disk environments in which they formed and potentially the evolution of primitive planetary materials in the disk. The oxygen isotopic composition of CR2 chondrite type-II chondrules was investigated. Our data show significant variation in the isotopic compositions of the chondrules with no petrographic or geochemical means to identify what chondrule will plot where on a three-isotope diagram. Although we cannot rule out that these chondrules may have come from another chondrite-forming region, we argue in context of type-I chondrules from CR2 chondrites that CR2 type-II chondrules record changes in solid and gas composition during formation due to the vaporization of icy bodies in localized regions of the inner disk.",

author = "Connolly, {Harold C.} and Huss, {Gary R.}",

note = "Funding Information: We thank Ken Domanik for assistance with the electron microprobe and Kazuhide Nagashima for assistance with the ion microprobe. We are indebted to both of these individuals. We are also grateful to Sasha Krot for many hours of stimulating discussion and fun while operating the ion microprobe. We thank Dante Lauretta and Michael Weisberg for many important discussions that helped shape this research. Connolly is grateful to HEMJKR for so many things. This manuscript was improved by constructive reviews by Hisayoshi Yurimoto, Noriko Kita, Fred Ciesla, and Associate Editor Jitendra Goswami, which were all most helpful. This research was supported by NASA Grant # NNG05GF39G to Harold C. Connolly Jr., PI and both NASA Grant #{\textquoteright}s NNG05GG48G and NNX08AG58G to Gary R. Huss, PI.",

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N1 - Funding Information: We thank Ken Domanik for assistance with the electron microprobe and Kazuhide Nagashima for assistance with the ion microprobe. We are indebted to both of these individuals. We are also grateful to Sasha Krot for many hours of stimulating discussion and fun while operating the ion microprobe. We thank Dante Lauretta and Michael Weisberg for many important discussions that helped shape this research. Connolly is grateful to HEMJKR for so many things. This manuscript was improved by constructive reviews by Hisayoshi Yurimoto, Noriko Kita, Fred Ciesla, and Associate Editor Jitendra Goswami, which were all most helpful. This research was supported by NASA Grant # NNG05GF39G to Harold C. Connolly Jr., PI and both NASA Grant #’s NNG05GG48G and NNX08AG58G to Gary R. Huss, PI.

PY - 2010/4/15

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N2 - Chondrules are the dominant component of chondritic meteorites and attest to high-temperature transient heating events within the protoplanetary disk. They provide valuable constraint on the disk environments in which they formed and potentially the evolution of primitive planetary materials in the disk. The oxygen isotopic composition of CR2 chondrite type-II chondrules was investigated. Our data show significant variation in the isotopic compositions of the chondrules with no petrographic or geochemical means to identify what chondrule will plot where on a three-isotope diagram. Although we cannot rule out that these chondrules may have come from another chondrite-forming region, we argue in context of type-I chondrules from CR2 chondrites that CR2 type-II chondrules record changes in solid and gas composition during formation due to the vaporization of icy bodies in localized regions of the inner disk.

AB - Chondrules are the dominant component of chondritic meteorites and attest to high-temperature transient heating events within the protoplanetary disk. They provide valuable constraint on the disk environments in which they formed and potentially the evolution of primitive planetary materials in the disk. The oxygen isotopic composition of CR2 chondrite type-II chondrules was investigated. Our data show significant variation in the isotopic compositions of the chondrules with no petrographic or geochemical means to identify what chondrule will plot where on a three-isotope diagram. Although we cannot rule out that these chondrules may have come from another chondrite-forming region, we argue in context of type-I chondrules from CR2 chondrites that CR2 type-II chondrules record changes in solid and gas composition during formation due to the vaporization of icy bodies in localized regions of the inner disk.

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Compositional evolution of the protoplanetary disk: Oxygen isotopes of type-II chondrules from CR2 chondrites

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