HED-like cosmic spherules from the Transantarctic Mountains, Antarctica: Major and trace element abundances and oxygen isotopic compositions

Cordier, Carole; Suavet, C.; Folco, Luigi; Rochette, P.; Sonzogni, Corinne

doi:10.1016/j.gca.2011.10.021

Cited by 26 publications

(77 citation statements)

References 75 publications

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“…Together, their specific Fe/Mg and Fe/Mn ratios (Fig. 1a) and their position in the three-oxygen isotopic space between 4-Vesta fractionation line and stratospheric oxygen composition suggest, however, that they are all related to HED asteroids similar in composition to 4-Vesta (Taylor et al, 2007;Cordier et al, 2011bCordier et al, , 2012.…”

Section: Micrometeorite Statistics: Flux and Composition Of The Near mentioning

confidence: 97%

“…When analyzed, Na 2 O contents are low (<0.31 wt.% Na 2 O), which suggests that studied particles do not derive from ablation of larger objects during atmospheric entry . Cosmic spherules come from mid-Pacific deep-sea sediments (Clayton et al, 1986;Engrand et al, 2005), Antarctic ice Taylor et al, 2005;Yada et al, 2005), and loose Antarctic sediments (Suavet et al, 2010(Suavet et al, , 2011Cordier et al, 2011aCordier et al, , 2012. Their apparent diameter ranges from 50 to 2280 lm, with a gradual decrease in the spherule number with increasing size and a gap between 1600 and 2200 lm (Fig.…”

Section: A Statistically Consistent Datasetmentioning

confidence: 99%

“…2) (Clayton et al, 1986;Engrand et al, 2005;Taylor et al, 2005;Yada et al, 2005;Suavet et al, 2010Suavet et al, , 2011Cordier et al, 2011aCordier et al, , 2012. No compositional data exist for spherules analyzed for oxygen isotopes by Suavet et al (2010).…”

Section: Introductionmentioning

confidence: 99%

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Oxygen isotopes in cosmic spherules and the composition of the near Earth interplanetary dust complex

Cordier

Folco

2014

Geochimica et Cosmochimica Acta

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Section: Micrometeorite Statistics: Flux and Composition Of The Near mentioning

confidence: 97%

Section: A Statistically Consistent Datasetmentioning

confidence: 99%

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Oxygen isotopes in cosmic spherules and the composition of the near Earth interplanetary dust complex

Cordier

Folco

2014

Geochimica et Cosmochimica Acta

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“…Cordier et al. () reports that basaltic cosmic spherules have glassy textures and attributes this characteristic to the lower melting temperatures of iron‐bearing silicates found in these basaltic materials. However, given that peak temperature is a function of entry velocity, entry angle, and particle size (Love and Brownlee ), the observation that basaltic MMs have largely glassy textures could also imply they are derived from a dust source with higher geocentric velocity than the average for chondritic particles.…”

Section: Introductionmentioning

confidence: 99%

The entry heating and abundances of basaltic micrometeorites

Genge

2017

Meteorit & Planetary Scien

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Abstract-Basaltic micrometeorites (MMs) derived from HED-like parent bodies have been found among particles collected from the Antarctic and from Arctic glaciers and are to date the only achondritic particles reported among cosmic dust. The majority of Antarctic basaltic particles are completely melted cosmic spherules with only one unmelted particle recognized from the region. This paper investigates the entry heating of basaltic MMs in order to predict the relative abundances of unmelted to melted basaltic particles and to evaluate how mineralogical differences in precursor materials influence the final products of atmospheric entry collected on the Earth's surface. Thermodynamic modeling is used to simulate the melting behavior of particles with compositions corresponding to eucrites, diogenites, and ordinary chondrites in order to evaluate degree of partial melting and to make a comparison between the behavior of chondritic particles that dominate the terrestrial dust flux and basaltic micrometeroids. The results of 120,000 simulations were compiled to predict relative abundances and indicate that the phase relations of precursor materials are crucial in determining the relative abundances of particle types. Diogenite and ordinary chondrite materials exhibit similar behavior, although diogenite precursors are more likely to form cosmic spherules under similar entry parameters. Eucrite particles, however, are much more likely to melt due to their lower liquidus temperatures and small temperature interval of partial melting. Eucrite MMs, therefore, usually form completely molten cosmic spherules except at particle diameters <100 lm. The low abundance of unmelted basaltic MMs compared with spherules, if statistically valid, is also shown to be inconsistent with a low velocity population (12 km s À1 ) and is more compatible with higher velocities which may suggest a near-Earth asteroid source dominates the current dust production of basaltic MMs.

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“…Acknowledgments-We thank the anonymous reviewers and editors for their suggestions and direction and acknowledge the NSF REU Grant EAR 0354002 for supporting the original collection of quarry material; the management of Quality Aggregates, Inc. for allowing access to their property; the Geology Department at USF for the use of lab space; and Carl Mendelson, Sue Swanson, Jim Rougvie, and the Geology faculty of Beloit College for support and access to equipment for the initial project. This work could not have been done without the technical help of the Carnegie Institution for Science's Geophysical (Folco et al 2009, achondritic V-type cosmic spherules (Taylor et al 2007;Cordier et al 2011Cordier et al , 2012, and mafic and felsic rocks (Zhang et al 2013;Liu et al 2015). All values are from those elements that were above the detection limits of the original EDS analysis.…”

Section: Discussionmentioning

confidence: 99%

A first report of microtektites from the shell beds of southwestern Florida

Meyer

Harries

Portell

2019

Meteorit & Planetary Scien

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The Plio‐Pleistocene Upper Tamiami Formation (Pinecrest beds) of Florida is well known for its fossiliferous shell beds, but not for its extraterrestrial material. Here we report the first occurrence of tiny (~200 μm in diameter) silica‐rich microspherules from this unit and from the state. This material was analyzed using petrographic and elemental methods using energy dispersive X‐ray spectroscopy (EDS). The majority of microspherules are glassy and translucent in reflected light with some displaying “contact pairs” (equal‐sized micro‐spherules attached to each other). Broken microspherules cleave conchoidally, often with small internal spherical vesicles, but most lack any other evidence of internal features, such as layering. Using the EDS data, the microspherules were compared to volcanic rocks, microtektites, and cosmic spherules (micrometeorites). Based on their physical characteristics and elemental compositions these are likely microtektites or a closely related type of material. The high Na content in the examined material deviates significantly from the abundances usually found in micrometeorites and tektite material; this is enigmatic and requires further study. This material may be derived from a nearby previously unknown impact event; however, more material and sites are required to confirm the source of this material. Because of the focus on molluscan fossils in southwestern Florida shell beds, microtektite material has likely been overlooked in the past, and it is probable that these microspherules are in abundance elsewhere in these units and possibly throughout the region.

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HED-like cosmic spherules from the Transantarctic Mountains, Antarctica: Major and trace element abundances and oxygen isotopic compositions

Cited by 26 publications

References 75 publications

Oxygen isotopes in cosmic spherules and the composition of the near Earth interplanetary dust complex

Oxygen isotopes in cosmic spherules and the composition of the near Earth interplanetary dust complex

The entry heating and abundances of basaltic micrometeorites

A first report of microtektites from the shell beds of southwestern Florida

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