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

Allan Hills A77003 meteorite (ALHA77003), Allan Hills, Victoria Land, Eastern Antarctica, Antarctica

This page is currently not sponsored. Click here to sponsor this page.
 
Latitude & Longitude (WGS84): 76° 43' South , 159° 40' East
Latitude & Longitude (decimal): -76.71667,159.66667
Other regions containing this locality:Antarctic Meteorites
Non-native locality type:Meteorite
Meteorite Class:CO3.6 chondrite meteorite
Meteoritical Society Class: CO3.6
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:EF : Ice cap climate


Carbonaceous Chondrite (CO3.6; S1; W1)
Find, 1977; 780 g

A small rounded stone with its top surface still covered with a dark glassy fusion crust was recovered from the Antarctic ice. While some staining has affected the bottom surface, upon inspection the meteorite is a relatively unweathered assemblage of well-defined chondrules accompanied by various small fragments and inclusions within a very fine-grained, dark matrix. Chondrules are mostly olivine rich (porphyritic and granular olivine [PO, GO]). Individual mineral grains and fragments are mostly olivine and orthopyroxene, somewhat variable in composition but usually Mg-rich. When recovered in 1977, ALHA77003 was only the 2nd CO (Ornans-like) carbonaceous chondrite recovered from Antarctica and only the 4th CO find. Two other CO chondrites were also recovered in the same year, but today the count of Antarctic COs listed is now approaching 300. [As of mid-2015, most of the ~290 records refer to small stones which undoubtedly represent a much smaller number of individual falls.]

For such a small stone ALHA77003 has received a healthy amount of attention during the past few decades. Much of the interest has been in separating possible effects of terrestrial weathering from hydrous metamorphism on the ALHA77003 original homeworld. Apparently, the mineral assemblages were altered by intermittent activities on a small world with its own endowment of ice several billion years before the meteorite fell onto the Antarctic ice. Other metamorphic activity of interest involve the small CAI spinel-rich assemblages, usually rimmed with phases out of equilibrium with the interior. Much of this metamorphic activity presumably occurred in earlier, much warmer regions of the ancient solar nebula.


Nota Bene: In the literature the meteorite is frequently called 'Allan Hills 77003' and 'ALH77003' (following simpler naming conventions adopted after the meteorite had been formally named).

Mineral List


12 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

Score, R. & 5 others. Antarctic Meteorite Newsletter 4 (1): p.10. (Feb 1981)

Scott, E. R. D., Taylor, G.J., Maggiore P., Keil K. & Mckinley S.G. (1981) Three CO3 chondrites from Antarctica — Comparison of carbonaceous and ordinary type 3 chondrites: Meteoritics 16( 4): 385. (Dec 1981).

Cirlin, E.-H. (1984) SEM Studies of Whitlockite and Chromite in Metal-Sulfide Droplets in a c3 Allan Hills Meteorite and Their Implications (Abstract.): Lunar and Planetary Science XV: 162-163. (Mar 1984)

Housley, R. M. (1984) An SEM study of preterrestrial alteration effects in ALHA 77003. Meteoritics 19( 4): 242 - 243. (Dec 1984)

Russell, S. S., Greenwood, R. C., Fahey, A. J., Huss, G. R., & Wasserburg, G. J. (1994) An ion microprobe study of CAIs from CO3 meteorites: Meteoritics 29 (4): 525-526. (July 1994).

Brearley, A. J. & R.H. (1998) Chondritic Meteorites: IN: Planetary Materials (Papike, JJ,Editor), 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.

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. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: May 24, 2019 11:06:51 Page generated: November 12, 2017 09:38:54
Go to top of page