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

Bilanga meteorite, Bilanga-Yanga, Gnagna Province, East Region, Burkina Faso

This page is currently not sponsored. Click here to sponsor this page.
 
Latitude & Longitude (WGS84): 12° 27' North , 0° 5' West
Latitude & Longitude (decimal): 12.45000,-0.08333
Non-native locality type:Meteorite
Meteorite Class:Diogenite meteorite
Meteoritical Society Class: Diogenite
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:Aw : Tropical savanna, wet
Name(s) in local language(s):, Est Région, République de Haute-Volta


Diogenite, severely brecciated
Fell 27 Oct1999; 25 kg

A number of black stones covered with fresh fusion crusts were collected after a widely observed meteorite shower fell near the villages of Bilanga-Yanga and Gomponsago. The meteorite is one of only 11 witnessed diogenite falls recorded before 2014 and is the second most massive of all recovered diogenites. Like the great majority of diogenites, Bilanga is a plutonic pyroxenite compositionally dominated by orthopyroxene which crystallized well below (10-25 km??) the surface of its original parent body. Bilanga is somewhat unusual among diogenites as it contains significant amounts of accessory plagioclase (mostly bytownite), diopside, and silica which appear to have crystallized somewhat later than the predominant orthopyroxene. Bilanga is even more unusual because it is one of the most severely brecciated diogenites. Brecciation features include chemically related diogenite lithologies of varying grain size, partially recrystallized melt pockets, and some Si-,K-rich glass. It is also somewhat richer in its entourage of minor phases which have apparently crystallized in the interstices between the various assemblages and comminuted clasts which were partially reequilibrated and reassembled after brecciating events. Minor phases include K-Feldspar, Co-containing kamacite, tetrataenite, pentlandite, native copper, a light rare earth element-bearing phosphate, and several quench phases.

As an apparently 'geochemically normal' member of the HED Clan (Howardites-Eucrites-Diogenites) Bilanga may very well be a fragment of the asteroid 4 Vesta. However, more definitive work with O-isotope and Fe-Mn ratios and other geochemical and chronological markers is apparently needed before we can confidently declare which specific HED meteorites are fragments of Vesta and which are exceptions. O-isotope and Fe/Mn ratios clearly indicate that a few anomalous HED meteorites (e.g., Ibitira, Pasamonte) are from separate homeworlds, but definitive evidence for a putative 'main group' of HED meteorites derived only from Vesta is a work still in progress.


Mineral List


8 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

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grossman, J. N. & Zipfel, J. (2000). The Meteoritical Bulletin, No. 84, 2000 September. Meteoritics & Planetary Science 35, #9 (Suppl.): A199-A225. (Sept 2000).
Kolar, S. E., Domanik, K. J., Musslewhite, D. S. & Drake, M. J. (2002) Bilanga: A Unique Diogenite. Lunar and Planetary Science Conference XXXIII: pdf.1338 (Mar 2002)
Domanik, K. J., Shearer, C. K., Hagerty, J., Kolar, S. E. & Drake, M. J. (2003) Trace Elements in High-Ca Pyroxene & Plagioclase in the Bilanga Diogenite: Implications for the Magmatic Evolution of Diogenites. Annual Lunar and Planetary Science ConferenceXXXIV: abstract no.2042. (March 2003)
Domanik, K., Kolar, S., Musselwhite, D. & Drake, M. J. (2004) Accessory silicate mineral assemblages in the Bilanga diogenite: A petrographic study. Meteoritics & Planetary Science 39(4): 567-579. (April 2004)
Scott, E. R. D., Greenwood, R. C., Franchi, I. A. & Sanders, I. S. (2009) Oxygen isotopic constraints on the origin and parent bodies of eucrites, diogenites, and howardites. Geochimica et Cosmochimica Acta73 (19): 5835-5853. (Oct 2009)

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 20, 2019 11:47:49 Page generated: February 6, 2018 04:21:11
Go to top of page