Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Yamato 81020 meteorite (Y-81020), Queen Fabiola Mts (Yamato Mts), Queen Maud Land (Dronning Maud Land), Eastern Antarctica, Antarctica

This page is currently not sponsored. Click here to sponsor this page.
 
Latitude & Longitude (WGS84): 71° 30' South , 35° 40' East
Latitude & Longitude (decimal): -71.50000,35.66667
Other regions containing this locality:Antarctic Meteorites
Non-native locality type:Meteorite
Meteorite Class:CO3.0 chondrite meteorite
Meteoritical Society Class: CO3.0
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:EF : Ice cap climate


Carbonaceous Chondrite (CO3.0; S1)
Find, 1981; 270 g

Yamato 81020 (Y-81020) is a very small stone rich in small chondrules and inclusions embedded in a very fine-grained matrix. While it was soon recognized as a somewhat primitive CO (Ornans-like) carbonaceous chondrite [See Graham, et al., 1985], early interest in the meteorite was focused on the small spinel-rich refractory inclusions within the meteorite and very little of the readily available literature references the small olivine and pyroxene chondrules or tiny silicate grains within the matrix which actually constitute most of the meteorite. That is beginning to change because it now clear that Y-81020 is one of the very few type 3.0 CO meteorites and is not only rich in relatively unaltered spinels and other high temperature condensates from the early solar nebula, but its chondrules, amoeboidal olivine-rich aggregates, and matrix silicates are an isotopically diverse mixture from a very ancient physical regime within the early solar nebula — a regime that is sparsely represented even within the carbonaceous chondrites themselves.

As of July 2014 all 498 known CO chondrites were classified as type CO3 chondrites, but only 64 CO chondrites have been classified as belonging to one of the subtypes between CO3.0 and CO3.8. Yamato 81020 is one of the 7 known CO3.0 meteorites. Four of the CO3.0s are Northwest Africa meteorites and represent an unknown number of separate falls (1-4?) as the main masses of 3 of them are held by the same individual. As (probably) one of only 4 or 5 CO3.0 meteorites, Y-81020 is a rare meteorite indeed.

Mineral List


16 valid minerals.

Meteorite/Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram


This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Graham, A. L., Yanai, K., Kojima, H. & Ikadai, S. (1985) Yamato 81020 and Yamato 82042; Two New Carbonaceous Chondrites from Antarctica: Meteoritics 20 (4): 654-655. (Dec 1985).

Kojima, T., Yada, S. & Tomeoka, K. (1995) Ca-Al-rich inclusions in three Antarctic CO3 chondrites, Yamato-81020 Yamato-82050 and Yamato-790992: Record of low temperature alteration. Proc. NIPR Symposium. Antarct. Meteorites 8: 79-96. (May 1995).

Brearley, A. J. & Jones, R. H. (1998) Chondritic Meteorites: IN: Planetary Materials (Papike, J.J. [Ed.]), Chapter 3, 398 pages: Mineralogical Society of America: Washington, DC, USA.

Grady, M. M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

Yurimoto, H., Rubin, A. E., Itoh, S. & Wasson, J. T. (2001) Non-Stoichiometric Al-rich Spinel in an Ultra-Refractory Inclusion from CO Chondrite (abstract): Lunar and Planetary Science Conference XXXII, abstract #1557. (Mar 2001)

Itoh, S., Rubin, A. E., Kojima, H., Wasson, J. T. & Yurimoto, H. (2003) Amoeboid Olivine Aggregates and AOA-bearing Chondrule from Y-81020 CO3.0 Chondrite: Distribution of Oxygen and Magnesium Isotopes (abstract): Lunar and Planetary Science Conference XXXIII, abstract no.1490. (Mar 2003).

Komatsu, M., Krot, A. N., Miyamoto, M. & Keil, K. (2005) EBSD Study of Amoeboid Olivine Aggregates with Low-Ca Pyroxenes in the Y-81020 CO3.0 Chondrite (abstract): Annual Lunar and Planetary Science Conference XXXVI, abstract #1573. (March 2005).

Tenner, T. J., Ushikubo, T., Kurahashi, E., Kita, N. T. & Nagahara, H. (2011) Oxygen Isotopic Measurements of Phenocrysts in Chondrules from the Primitive Carbonaceous Chondrite Yamato 81020: Evidence for Two Distinct Oxygen Isotope Reservoir. Lunar and Planetary Science Conference XLII. LPI Contribution #1608: p.1426. (March 2011).

Krot, A. N., Doyle, P. & Nagashima, K. (2013) Secondary Fayalite, Hedenbergite, and Magnetite in the CO3.0-3.1 Carbonaceous Chondrites Y-81020, EET 90043, and MAC 88107: Lunar and Planetary Science Conference XLIV. LPI Contribution #1719: p.1754. (Mar 2013).

Grady, M. M., Pratesi, G. & Moggi Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

External Links


Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: February 21, 2019 08:33:36 Page generated: November 12, 2017 09:38:45
Go to top of page