Cometary dust in Antarctic ice and snow: Past and present chondritic porous micrometeorites preserved on the Earth's surface

Takaaki Noguchi, Noriaki Ohashi, Shinichi Tsujimoto, Takuya Mitsunari, John P. Bradley, Tomoki Nakamura, Shoichi Toh, Thomas Stephan, Naoyoshi Iwata, Naoya Imae

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Chondritic porous interplanetary dust particles (CP IDPs) collected in the stratosphere are regarded as possibly being cometary dust, and are therefore the most primitive solar system material that is currently available for analysis in laboratories. In this paper we report the discovery of more than 40 chondritic porous micrometeorites (CP MMs) in the surface snow and blue ice of Antarctica, which are indistinguishable from CP IDPs. The CP MMs are botryoidal aggregates, composed mainly of sub-micrometer-sized constituents. They contain two components that characterize them as CP IDPs: enstatite whiskers and GEMS (glass with embedded metal and sulfides). Enstatite whiskers appear as <2-μm-long acicular objects that are attached on, or protrude from the surface, and when included in the interior of the CP MMs are composed of a unit-cell scale mixture of clino- and ortho-enstatite, and elongated along the [100] direction. GEMS appear as 100-500 nm spheroidal objects containing <50 nm Fe-Ni metal and Fe sulfide. The CP MMs also contain low-iron-manganese-enriched (LIME) and low-iron-chromium-enriched (LICE) ferromagnesian silicates, kosmochlor (NaCrSi2O6)-rich high-Ca pyroxene, roedderite (K, Na)2Mg5Si12O30, and carbonaceous nanoglobules. These components have previously been discovered in primitive solar system materials such as the CP IDPs, matrices of primitive chondrites, phyllosilicate-rich MMs, ultracarbonaceous MMs, and cometary particles recovered from the 81P/Wild 2 comet. The most outstanding feature of these CP MMs is the presence of kosmochlor-rich high-Ca pyroxene and roedderite, which suggest that they have building blocks in common with CP IDPs and cometary dust particles and therefore suggest a possible cometary origin of both CP MMs and CP IDPs. It is therefore considered that CP MMs are CP IDPs that have fallen to Earth and have survived the terrestrial environment.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalEarth and Planetary Science Letters
Volume410
DOIs
Publication statusPublished - Jan 5 2015

Fingerprint

micrometeorites
micrometeorite
Ice
snow
Earth surface
interplanetary dust
Snow
Dust
Particles (particulate matter)
ice
dust
Earth (planet)
enstatite
Sulfides
sulfides
Solar system
Metals
sulfide
solar system
pyroxene

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Cometary dust in Antarctic ice and snow : Past and present chondritic porous micrometeorites preserved on the Earth's surface. / Noguchi, Takaaki; Ohashi, Noriaki; Tsujimoto, Shinichi; Mitsunari, Takuya; Bradley, John P.; Nakamura, Tomoki; Toh, Shoichi; Stephan, Thomas; Iwata, Naoyoshi; Imae, Naoya.

In: Earth and Planetary Science Letters, Vol. 410, 05.01.2015, p. 1-11.

Research output: Contribution to journalArticle

Noguchi, Takaaki ; Ohashi, Noriaki ; Tsujimoto, Shinichi ; Mitsunari, Takuya ; Bradley, John P. ; Nakamura, Tomoki ; Toh, Shoichi ; Stephan, Thomas ; Iwata, Naoyoshi ; Imae, Naoya. / Cometary dust in Antarctic ice and snow : Past and present chondritic porous micrometeorites preserved on the Earth's surface. In: Earth and Planetary Science Letters. 2015 ; Vol. 410. pp. 1-11.
@article{074a638fdda547f6805e2deb8b0289f9,
title = "Cometary dust in Antarctic ice and snow: Past and present chondritic porous micrometeorites preserved on the Earth's surface",
abstract = "Chondritic porous interplanetary dust particles (CP IDPs) collected in the stratosphere are regarded as possibly being cometary dust, and are therefore the most primitive solar system material that is currently available for analysis in laboratories. In this paper we report the discovery of more than 40 chondritic porous micrometeorites (CP MMs) in the surface snow and blue ice of Antarctica, which are indistinguishable from CP IDPs. The CP MMs are botryoidal aggregates, composed mainly of sub-micrometer-sized constituents. They contain two components that characterize them as CP IDPs: enstatite whiskers and GEMS (glass with embedded metal and sulfides). Enstatite whiskers appear as <2-μm-long acicular objects that are attached on, or protrude from the surface, and when included in the interior of the CP MMs are composed of a unit-cell scale mixture of clino- and ortho-enstatite, and elongated along the [100] direction. GEMS appear as 100-500 nm spheroidal objects containing <50 nm Fe-Ni metal and Fe sulfide. The CP MMs also contain low-iron-manganese-enriched (LIME) and low-iron-chromium-enriched (LICE) ferromagnesian silicates, kosmochlor (NaCrSi2O6)-rich high-Ca pyroxene, roedderite (K, Na)2Mg5Si12O30, and carbonaceous nanoglobules. These components have previously been discovered in primitive solar system materials such as the CP IDPs, matrices of primitive chondrites, phyllosilicate-rich MMs, ultracarbonaceous MMs, and cometary particles recovered from the 81P/Wild 2 comet. The most outstanding feature of these CP MMs is the presence of kosmochlor-rich high-Ca pyroxene and roedderite, which suggest that they have building blocks in common with CP IDPs and cometary dust particles and therefore suggest a possible cometary origin of both CP MMs and CP IDPs. It is therefore considered that CP MMs are CP IDPs that have fallen to Earth and have survived the terrestrial environment.",
author = "Takaaki Noguchi and Noriaki Ohashi and Shinichi Tsujimoto and Takuya Mitsunari and Bradley, {John P.} and Tomoki Nakamura and Shoichi Toh and Thomas Stephan and Naoyoshi Iwata and Naoya Imae",
year = "2015",
month = "1",
day = "5",
doi = "10.1016/j.epsl.2014.11.012",
language = "English",
volume = "410",
pages = "1--11",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier",

}

TY - JOUR

T1 - Cometary dust in Antarctic ice and snow

T2 - Past and present chondritic porous micrometeorites preserved on the Earth's surface

AU - Noguchi, Takaaki

AU - Ohashi, Noriaki

AU - Tsujimoto, Shinichi

AU - Mitsunari, Takuya

AU - Bradley, John P.

AU - Nakamura, Tomoki

AU - Toh, Shoichi

AU - Stephan, Thomas

AU - Iwata, Naoyoshi

AU - Imae, Naoya

PY - 2015/1/5

Y1 - 2015/1/5

N2 - Chondritic porous interplanetary dust particles (CP IDPs) collected in the stratosphere are regarded as possibly being cometary dust, and are therefore the most primitive solar system material that is currently available for analysis in laboratories. In this paper we report the discovery of more than 40 chondritic porous micrometeorites (CP MMs) in the surface snow and blue ice of Antarctica, which are indistinguishable from CP IDPs. The CP MMs are botryoidal aggregates, composed mainly of sub-micrometer-sized constituents. They contain two components that characterize them as CP IDPs: enstatite whiskers and GEMS (glass with embedded metal and sulfides). Enstatite whiskers appear as <2-μm-long acicular objects that are attached on, or protrude from the surface, and when included in the interior of the CP MMs are composed of a unit-cell scale mixture of clino- and ortho-enstatite, and elongated along the [100] direction. GEMS appear as 100-500 nm spheroidal objects containing <50 nm Fe-Ni metal and Fe sulfide. The CP MMs also contain low-iron-manganese-enriched (LIME) and low-iron-chromium-enriched (LICE) ferromagnesian silicates, kosmochlor (NaCrSi2O6)-rich high-Ca pyroxene, roedderite (K, Na)2Mg5Si12O30, and carbonaceous nanoglobules. These components have previously been discovered in primitive solar system materials such as the CP IDPs, matrices of primitive chondrites, phyllosilicate-rich MMs, ultracarbonaceous MMs, and cometary particles recovered from the 81P/Wild 2 comet. The most outstanding feature of these CP MMs is the presence of kosmochlor-rich high-Ca pyroxene and roedderite, which suggest that they have building blocks in common with CP IDPs and cometary dust particles and therefore suggest a possible cometary origin of both CP MMs and CP IDPs. It is therefore considered that CP MMs are CP IDPs that have fallen to Earth and have survived the terrestrial environment.

AB - Chondritic porous interplanetary dust particles (CP IDPs) collected in the stratosphere are regarded as possibly being cometary dust, and are therefore the most primitive solar system material that is currently available for analysis in laboratories. In this paper we report the discovery of more than 40 chondritic porous micrometeorites (CP MMs) in the surface snow and blue ice of Antarctica, which are indistinguishable from CP IDPs. The CP MMs are botryoidal aggregates, composed mainly of sub-micrometer-sized constituents. They contain two components that characterize them as CP IDPs: enstatite whiskers and GEMS (glass with embedded metal and sulfides). Enstatite whiskers appear as <2-μm-long acicular objects that are attached on, or protrude from the surface, and when included in the interior of the CP MMs are composed of a unit-cell scale mixture of clino- and ortho-enstatite, and elongated along the [100] direction. GEMS appear as 100-500 nm spheroidal objects containing <50 nm Fe-Ni metal and Fe sulfide. The CP MMs also contain low-iron-manganese-enriched (LIME) and low-iron-chromium-enriched (LICE) ferromagnesian silicates, kosmochlor (NaCrSi2O6)-rich high-Ca pyroxene, roedderite (K, Na)2Mg5Si12O30, and carbonaceous nanoglobules. These components have previously been discovered in primitive solar system materials such as the CP IDPs, matrices of primitive chondrites, phyllosilicate-rich MMs, ultracarbonaceous MMs, and cometary particles recovered from the 81P/Wild 2 comet. The most outstanding feature of these CP MMs is the presence of kosmochlor-rich high-Ca pyroxene and roedderite, which suggest that they have building blocks in common with CP IDPs and cometary dust particles and therefore suggest a possible cometary origin of both CP MMs and CP IDPs. It is therefore considered that CP MMs are CP IDPs that have fallen to Earth and have survived the terrestrial environment.

UR - http://www.scopus.com/inward/record.url?scp=84911871345&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84911871345&partnerID=8YFLogxK

U2 - 10.1016/j.epsl.2014.11.012

DO - 10.1016/j.epsl.2014.11.012

M3 - Article

AN - SCOPUS:84911871345

VL - 410

SP - 1

EP - 11

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

ER -