C. B. Agee
YOU?
Author Swipe
View article: Tirhert and Aouinet Legraa: Rare unbrecciated eucrite falls
Tirhert and Aouinet Legraa: Rare unbrecciated eucrite falls Open
Tirhert and Aouinet Legraa are the only documented unbrecciated eucrite falls in Africa. Aouinet Legraa fell in Algeria on July 17, 2013. Tirhert's fall occurred about a year later in Morocco, on July 9, 2014. Both meteorites are covered b…
View article: Planning Implications Related to Sterilization-Sensitive Science Investigations Associated with Mars Sample Return (MSR)
Planning Implications Related to Sterilization-Sensitive Science Investigations Associated with Mars Sample Return (MSR) Open
The NASA/ESA Mars Sample Return (MSR) Campaign seeks to establish whether life on Mars existed where and when environmental conditions allowed. Laboratory measurements on the returned samples are useful if what is measured is evidence of p…
View article: Science and Curation Considerations for the Design of a Mars Sample Return (MSR) Sample Receiving Facility (SRF)
Science and Curation Considerations for the Design of a Mars Sample Return (MSR) Sample Receiving Facility (SRF) Open
The most important single element of the “ground system” portion of a Mars Sample Return (MSR) Campaign is a facility referred to as the Sample Receiving Facility (SRF), which would need to be designed and equipped to receive the returned …
View article: Olivine-rich achondrites from Vesta and the missing mantle problem
Olivine-rich achondrites from Vesta and the missing mantle problem Open
Mantles of rocky planets are dominantly composed of olivine and its high-pressure polymorphs, according to seismic data of Earth’s interior, the mineralogy of natural samples, and modelling results. The missing mantle problem represents th…
View article: Unique achondrite Northwest Africa 11042: Exploring the melting and breakup of the L Chondrite parent body
Unique achondrite Northwest Africa 11042: Exploring the melting and breakup of the L Chondrite parent body Open
Northwest Africa (NWA) 11042 is a heavily shocked achondrite with medium-grained cumulate textures. Its olivine and pyroxene compositions, oxygen isotopic composition, and chromium isotopic composition are consistent with L chondrites. Sm-…
View article: Mineralogy, Petrology, and Geochemistry of Martian Regolith Breccias: Insights into The Martian Crust
Mineralogy, Petrology, and Geochemistry of Martian Regolith Breccias: Insights into The Martian Crust Open
NWA 7034, NWA 8171, and NWA 11220 are polymict brecciated meteorites representing Martian surface regolith [1].We present integrated studies of mineralogy, petrology, and geochemistry of a suite of slabs and thin sections of Martian brecci…
View article: Constraints on Martian Chronology from Meteorites
Constraints on Martian Chronology from Meteorites Open
Martian meteorites provide the only direct constraints on the timing of Martian accretion, core formation, magmatic differentiation, and ongoing volcanism. While many radiogenic isotope chronometers have been applied to a wide variety of M…
View article: Hydrous olivine alteration on Mars and Earth
Hydrous olivine alteration on Mars and Earth Open
Hydrous alteration of olivine macrocrysts in a Martian olivine phyric basalt, NWA 10416, and a terrestrial basalt from southern Colorado are examined using SEM, EPMA, TEM, and µXRD techniques. The olivines in the meteorite contain linear n…
View article: The Meteoritical Bulletin, No. 104
The Meteoritical Bulletin, No. 104 Open
Meteoritical Bulletin 104 contains 2279 meteorites including 12 falls (Annama, Cartersville, Creston, Diepenveen, Famenin, Izarzar, Nkayi, Porangaba, San Juan de Ocotán, Trâpeăng Rônoăs, Xinglongquan, Žd’ár nad Sázavou), with 1847 ordinary…
View article: The Meteoritical Bulletin, No. 103
The Meteoritical Bulletin, No. 103 Open
Meteoritical Bulletin 103 contains 2582 meteorites including 10 falls (Ardón, Demsa, Jinju, Križevci, Kuresoi, Novato, Tinajdad, Tirhert, Vicência, Wolcott), with 2174 ordinary chondrites, 130 HED achondrites, 113 carbonaceous chondrites, …
View article: Geologic history of Martian regolith breccia Northwest Africa 7034: Evidence for hydrothermal activity and lithologic diversity in the Martian crust
Geologic history of Martian regolith breccia Northwest Africa 7034: Evidence for hydrothermal activity and lithologic diversity in the Martian crust Open
The timing and mode of deposition for Martian regolith breccia Northwest Africa (NWA) 7034 were determined by combining petrography, shape analysis, and thermochronology. NWA 7034 is composed of igneous, impact, and brecciated clasts withi…
View article: The chlorine isotopic composition of Martian meteorites 1: Chlorine isotope composition of Martian mantle and crustal reservoirs and their interactions
The chlorine isotopic composition of Martian meteorites 1: Chlorine isotope composition of Martian mantle and crustal reservoirs and their interactions Open
The Martian meteorites record a wide diversity of environments, processes, and ages. Much work has been done to decipher potential mantle sources for Martian magmas and their interactions with crustal and surface environments. Chlorine iso…
View article: Assessing the Formation of Ungrouped Achondrite Northwest Africa 8186: Residue, Crystallization Product, or Recrystallized Chondrite?
Assessing the Formation of Ungrouped Achondrite Northwest Africa 8186: Residue, Crystallization Product, or Recrystallized Chondrite? Open
The recent discoveries of primitive achondrites, metachondrites, and type 7 chondrites challenge the long held idea that all chondrites and achondrites form on separate parent bodies. These meteorites have experienced metamorphic temperatu…
View article: Rb‐Sr and Sm‐Nd isotopic and <scp>REE</scp> studies of igneous components in the bulk matrix domain of Martian breccia Northwest Africa 7034
Rb‐Sr and Sm‐Nd isotopic and <span>REE</span> studies of igneous components in the bulk matrix domain of Martian breccia Northwest Africa 7034 Open
The bulk matrix domain of the Martian breccia NWA 7034 was examined petrographically and isotopically to better understand the provenance and age of the source material that make up the breccia. Both 147 Sm‐ 143 Nd and 146 Sm‐ 142 Nd age r…
View article: The chlorine isotope composition of Martian meteorites 2. Implications for the early solar system and the formation of Mars
The chlorine isotope composition of Martian meteorites 2. Implications for the early solar system and the formation of Mars Open
We determined the chlorine isotope composition of 16 Martian meteorites using gas source mass spectrometry on bulk samples and in situ secondary ion microprobe analysis on apatite grains. Measured δ 37 Cl values range from −3.8 to +8.6‰. T…