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Four Corners meteorite, San Juan Co., Utah, USAi
Regional Level Types
Four Corners meteoriteMeteorite Fall Location
San Juan Co.County
UtahState
USACountry

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Latitude & Longitude (WGS84): 37° 0' North , 109° 3' West
Latitude & Longitude (decimal): 37.00000,-109.05000
GeoHash:G#: 9wd6qx8hw
Locality type:Meteorite Fall Location
Meteorite Class:Ungrouped IAB iron meteorite
Meteoritical Society Class:Iron, IAB-ung
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:BSk : Cold semi-arid (steppe) climate
Nearest Settlements:
PlacePopulationDistance
Teec Nos Pos730 (2011)9.3km
Beclabito317 (2011)17.8km
Aneth501 (2011)26.9km
Red Mesa480 (2011)28.3km
Towaoc1,087 (2011)36.4km


Iron meteorite w. silicate inclusions, Octahedrite (IAB-ung, Om)
Found 1924; 25 kg

An iron-rich mass of ~25 kg was found in San Juan County. The meteorite consists primarily of a unique matrix of polycrystalline Fe-Ni metal with the expected minor accessories such as graphite, troilite, and schreibersite. Plessite occupies ~40 vol% of the metallic grains. This dominant octahedral framework is, however, accompanied by irregularly dispersed silicates inclusions representing ~15 vol% of the meteorite. Graphite is found as cliftonite crystals in troilite and kamacite, as rims around silicate grains, and as amorphous carbon. Troilite (shock melted) is found at grain boundaries and as filler between the silicates and graphites. Schreibersite is a late phase which occurs as skeleton crystals and precipitates which have frequently been deposited upon silicate-graphite crystals. Silicates form loose aggregates of pyroxenes (enstatite, diopside) with lesser amounts of Mg-rich olivine and sodic plagioclase (oligoclase). Some weathering has occurred, especially in the troilite.

Four Corners is one of the 47 'ungrouped' IAB iron meteorites which are not clearly associated with any of the various well-defined subgroups within the large IAB iron complex. As of the year 2000, approximately 5 kg was at the National Museum in Washington, but several masses >1 kg are distributed over the world.

Regions containing this locality

North America PlateTectonic Plate
Rocky Mountains, North AmericaMountain Range
Colorado Plateau, USAPlateau
Navajo Nation Indian Reservation, USAReservation
Hopi-Navajo Indian Reservations, Colorado Plateau, Apache & Navajo Cos., Arizona, USA

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


10 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

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Diopside
Formula: CaMgSi2O6
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Enstatite
Formula: MgSiO3
Description: Nearly colorless with Fe/Mg < 0.1
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
'Fayalite-Forsterite Series'
Description: Mg-rich forsterite
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Graphite
Formula: C
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Graphite var: Cliftonite
Formula: C
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Haxonite
Formula: (Fe,Ni)23C6
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Iron
Formula: Fe
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Iron var: Kamacite
Formula: (Fe,Ni)
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Iron var: Martensite
Formula: Fe
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
'Limonite'
Formula: (Fe,O,OH,H2O)
Description: A purplish weather product of shock-melted troilite.
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Pentlandite
Formula: (FexNiy)Σ9S8
Description: Converted troilite
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
'Plessite'
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Schreibersite
Formula: (Fe,Ni)3P
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Taenite
Formula: (Fe,Ni)
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Troilite
Formula: FeS
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.; Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Graphite1.CB.05aC
var: Cliftonite1.CB.05aC
Haxonite1.BA.10(Fe,Ni)23C6
Iron1.AE.05Fe
var: Kamacite1.AE.05(Fe,Ni)
var: Martensite1.AE.05Fe
Schreibersite1.BD.05(Fe,Ni)3P
Taenite1.AE.10(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
Pentlandite2.BB.15(FexNiy)Σ9S8
Troilite2.CC.10FeS
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Diopside9.DA.15CaMgSi2O6
Enstatite9.DA.05MgSiO3
Unclassified Minerals, Rocks, etc.
'Fayalite-Forsterite Series'-
'Limonite'-(Fe,O,OH,H2O)
'Plessite'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Haxonite1.1.16.2(Fe,Ni)23C6
Iron
var: Kamacite
1.1.11.1(Fe,Ni)
Schreibersite1.1.21.2(Fe,Ni)3P
Taenite1.1.11.2(Fe,Ni)
Semi-metals and non-metals
Graphite1.3.6.2C
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 9:8
Pentlandite2.7.1.1(FexNiy)Σ9S8
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Enstatite65.1.2.1MgSiO3
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
var: Oligoclase-(Na,Ca)[Al(Si,Al)Si2O8]
'Fayalite-Forsterite Series'-
Graphite
var: Cliftonite
-C
Iron-Fe
var: Martensite-Fe
'Limonite'-(Fe,O,OH,H2O)
'Plessite'-

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
CCarbon
C GraphiteC
C Graphite (var: Cliftonite)C
C Haxonite(Fe,Ni)23C6
OOxygen
O DiopsideCaMgSi2O6
O EnstatiteMgSiO3
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O Limonite(Fe,O,OH,H2O)
O AlbiteNa(AlSi3O8)
NaSodium
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg DiopsideCaMgSi2O6
Mg EnstatiteMgSiO3
AlAluminium
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al AlbiteNa(AlSi3O8)
SiSilicon
Si DiopsideCaMgSi2O6
Si EnstatiteMgSiO3
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si AlbiteNa(AlSi3O8)
PPhosphorus
P Schreibersite(Fe,Ni)3P
SSulfur
S TroiliteFeS
S Pentlandite(FexNiy)Σ9S8
CaCalcium
Ca DiopsideCaMgSi2O6
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
FeIron
Fe Iron (var: Kamacite)(Fe,Ni)
Fe Taenite(Fe,Ni)
Fe Schreibersite(Fe,Ni)3P
Fe TroiliteFeS
Fe Haxonite(Fe,Ni)23C6
Fe Iron (var: Martensite)Fe
Fe Pentlandite(FexNiy)Σ9S8
Fe Limonite(Fe,O,OH,H2O)
Fe IronFe
NiNickel
Ni Iron (var: Kamacite)(Fe,Ni)
Ni Taenite(Fe,Ni)
Ni Schreibersite(Fe,Ni)3P
Ni Haxonite(Fe,Ni)23C6
Ni Pentlandite(FexNiy)Σ9S8

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Late Jurassic
145 - 163.5 Ma



ID: 2964843
Morrison Formation (Brushy Basin and Salt Wash Members)

Age: Jurassic (145 - 163.5 Ma)

Stratigraphic Name: Brushy Basin Member; Salt Wash Member

Description: continental environment, braided rivers and streams, overbank mudstones. dinosaur fossils

Comments: Original map source: Hintze, L.F., Willis, G.C., Laes, D.Y.M., Sprinkel, D.A., and Brown, K.D., 2000, Digital Geologic Map of Utah: Utah Geological Survey, Map 179DM, scale 1:500,000.

Lithology: Major:{sandstone mudstone}, Minor:{conglomerate}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Early Jurassic - Late Triassic
174.1 - 237 Ma



ID: 3185972
Mesozoic sedimentary rocks

Age: Mesozoic (174.1 - 237 Ma)

Lithology: Sandstone-conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam, London: New York. 245 pages.
Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Grady, M. M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

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