NanoSIMS isotopic investigation of xenolithic carbonaceous clasts from the kapoeta howardite

Liu, Nan; Ogliore, R. C.; Vacher, Lionel G.

doi:10.1016/j.gca.2020.05.026

Cited by 6 publications

(5 citation statements)

References 129 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This process is in good agreement with the common presence of clasts of carbonaceous chondritic materials within howardites (e.g., Fig. 5) (Buchanan et al 1993;McSween et al 2011;Van Drongelen et al 2016;Liu et al 2020), regolith breccia meteorites belonging to the HED group and originating from the surface of Vesta.…”

Section: Evidence For Collisional Processes From In Situ Exploration Of Asteroidssupporting

confidence: 85%

“…Furthermore, all classes of meteorites contain xenolith clasts (Fig. 5)-characterized by different lithologies than their respective host rocks (e.g., Zolensky et al 1996;Bischoff et al 2006;Briani et al 2009Briani et al , 2012Bonal et al 2010;Liu et al 2020;Patzek et al 2020)-resulting from the low-velocity incorporation (i.e., <1 km s À1 ; Briani et al 2011) of micrometeoroids by asteroidal parent bodies (Rubin and Bottke 2009;Briani et al 2011). Such clasts differ from polymict breccias because they could have been incorporated into asteroids throughout the evolution of the solar system.…”

Section: Meteoritic Evidence Of Widespread Collision Processes In the Asteroid Beltmentioning

confidence: 99%

“…The complex evolution of asteroids is an ongoing process; recent reports suggest that impact-generated fluid circulations, probably triggered by hypervelocity impacts, have occurred within the past few hundreds of thousands of years (Amsellem et al 2020;Turner et al 2021). This is also highlighted by the ubiquitous presence of xenolith clasts in chondrites and achondrites (Zolensky et al 1996;Cohen et al 2004;Bischoff et al 2006;Briani et al 2009Briani et al , 2012Bonal et al 2010;Patzek et al 2018Patzek et al , 2020Liu et al 2020), which may have been incorporated into their current bodies by implantation processes and/or regolith gardening throughout the evolution of the solar system. Therefore, "primitive" samples are probably extremely rare, and the concept of primitivity should only be used to relatively describe two or several objects, and always in terms of processes.…”

Section: Implications and Perspectivesmentioning

confidence: 99%

See 2 more Smart Citations

The astrophysical context of collision processes in meteorites

Marrocchi

Delbò

Gounelle

2021

Meteorit & Planetary Scien

View full text Add to dashboard Cite

Chondrites are leftover solids from the early evolution of the solar protoplanetary disk that never experienced melting since their formation. They comprise unequilibrated assemblages of low-and high-temperature components, including volatile-rich, fine-grained matrices, Fe-Ni metal, sulfides, refractory inclusions, and chondrules. Consequently, chondrites are commonly described as pristine, primitive, or primordial rocks of the solar system. However, impact-generated secondary features are abundant in chondrites, suggesting that collisions among early-formed planetesimals and their fragmentation and reassembly have been effective throughout the evolution of the solar system. In this report, we review evidence of the major role of impacts in generating the current mineralogical and petrographic characteristics of chondrites. We provide perspective to these meteoritic features by discussing recent analyses of large-scale structures of the main asteroid belt and remote-sensing observations of asteroids. Observations at various spatial scales all attest that the "primitive" materials formed during the evolution of the solar system have largely been reprocessed, confirming previous studies that primitivity is relative, not absolute. This implies that (1) chondrites (and some differentiated meteorites) should systematically be envisioned as reprocessed and heterogeneous materials and (2) brecciated meteorites should be considered the norm and unbrecciated meteorites the exception.

show abstract

Section: Evidence For Collisional Processes From In Situ Exploration Of Asteroidssupporting

confidence: 85%

Section: Meteoritic Evidence Of Widespread Collision Processes In the Asteroid Beltmentioning

confidence: 99%

Section: Implications and Perspectivesmentioning

confidence: 99%

See 1 more Smart Citation

The astrophysical context of collision processes in meteorites

Marrocchi

Delbò

Gounelle

2021

Meteorit & Planetary Scien

View full text Add to dashboard Cite

show abstract

“…My lab has used these maps in a number of projects. We have identified cosmic symplectite in Acfer 094, searched for cosmic symplectite in other meteorites, located carbonaceous‐chondrite‐like clasts in the howardite Kapoeta (Liu et al., 2020), and identified an unusual Ti‐rich sulfide mineral in Acfer 182 (CH3) that would have been nearly impossible to find without these maps.…”

Section: Discussionmentioning

confidence: 99%

Acquisition and Online Display of High‐Resolution Backscattered Electron and X‐Ray Maps of Meteorite Sections

Ogliore

2021

Earth and Space Science

Self Cite

View full text Add to dashboard Cite

High-resolution electron and X-ray images covering an entire sample have been difficult to acquire, visualize, and share • New techniques described here allow for the acquisition, stitching, and display of very large electron and X-ray mosaics from a scanning electron microscope • Multi-gigapixel, mutli-channel maps displayed online can be used to compare meteorites with returned asteroid samples

show abstract

“…Less abundant type 1 clasts have been identified that are rich in sulfide and magnetite and typically have similar dD-signatures to CI chondrites, implying they are related (Patzek et al, 2019). Liu et al (2020) reported an unusually high abundance of type 1 material in a single thin section of the Kapoeta howardite meteorite; they conclude that the clasts are from a single ice-bearing asteroid or comet from the outer solar system.…”

Section: Vestan Meteorites (Howardites Eucrites and Diogenites)mentioning

confidence: 99%

Abundance and importance of petrological type 1 chondritic material

Russell

Suttle

King

2021

Meteorit & Planetary Scien

View full text Add to dashboard Cite

We review the mineralogy, petrology, and abundance of petrological type 1 extraterrestrial material. Such material has been completely altered by aqueous processing on its parent bodies. As well as the four meteorite groups that contain type 1 members (CI, CM, CR, and CY), we summarize data from the 2019 fall Flensburg and a recent reanalysis of the "meteorite" Bench Crater found on the Moon, along with fine-grained micrometeorites, interplanetary dust particles, and xenoliths in meteorites. Type 1 materials exhibit a remarkably high diversity of alteration conditions (temperature, water-to-rock [W/R] ratios, and fluid composition) and starting mineralogy. Type 1 material comprises a significant component of the modern extraterrestrial flux to the Earth and was likely common throughout the solar system during the whole course of its history, pointing to both widespread accretion with ices and heating of parent bodies. Type 1 materials are composed predominantly of various phyllosilicates, carbonates, sulfides, and magnetite. Some type 1 materials appear to be part of a "CM clan" typified by serpentine-rich phyllosilicate compositions and an oxygen isotope composition that falls in the 16 O-rich part of the CM field. Others span a wide range in d 18 O (>30&) and fall on or above the terrestrial fractionation line (+ve D 17 O). Positive D 17 O values are unusual for carbonaceous meteorites but are relatively common in type 1 materials. The wide variation in oxygen isotopes, as well as in textures, mineralogy, and bulk chemistry, points to multiple parent bodies that may originate in the inner and/or outer solar system. Cometary materials, or transition objects such as Main Belt comets or type D asteroids, are likely the source of much of the type 1 materials on Earth but relating them to specific parents requires more study.

show abstract

NanoSIMS isotopic investigation of xenolithic carbonaceous clasts from the kapoeta howardite

Cited by 6 publications

References 129 publications

The astrophysical context of collision processes in meteorites

The astrophysical context of collision processes in meteorites

Acquisition and Online Display of High‐Resolution Backscattered Electron and X‐Ray Maps of Meteorite Sections

Abundance and importance of petrological type 1 chondritic material

Contact Info

Product

Resources

About