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Elk Creek Carbonatite, Elk Creek, Johnson Co., Nebraska, USA

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Latitude & Longitude (WGS84): 40° 16' 13'' North , 96° 11' 23'' West
Latitude & Longitude (decimal): 40.27028,-96.19000
GeoHash:G#: 9z5t54ux6
Köppen climate type:Dfa : Hot-summer humid continental climate


Roughly circular 7 km. diameter deposit of carbonatite and associated regolith (weathering mantle), encountered at a depth of approximately 150 meters (500 ft.). Centered near Elk Creek in Johnson County (Sect. 33, T4N, R11E), also overlaps into Pawnee County. As of 2010, characterized only by core recovery from boreholes. Characterized by USGS as a potential large resource of niobium and other REE (rare earth elements).

A buried, rare earth elements (REE)- and niobium (Nb)-rich carbonatite mass, referred to as the Elk Creek carbonatite, lies in the subsurface about 1.6 km (1 mi) southwest of the small town of Elk Creek in southeastern Nebraska. On the basis of exploration drilling and the extent of magnetic and gravity anomalies, the carbonatite mass at depth appears to have its center beneath section 33, township 4 north, range 11 east. The entire oval-shaped, subsurface body, which is recognized by a geophysical anomaly caused by the carbonatite and associated intrusive rocks, is about 7 km (4.3 mi) in diameter. Analyses of drill core showed the intrusion at depth comprised mostly massive to brecciated, apatite- and pyrochlore-bearing dolomitic carbonatite (89 percent), along with fenitized basalt, lamprophyre, and syenite (totaling 11 percent). Major-element analyses suggest that the carbonate mass is a magnesian carbonatite (dolomitic), generally similar in gross chemical composition to the Iron Hill (Powderhorn) carbonatite stock in southwestern Colorado. The REE are hosted principally by the minerals bastnasite, parisite, and synchisite and by smaller amounts of monazite (Xu, 1996). Niobium was deposited in pyrochlore. The U.S. Geological Survey obtained a potassium-argon age on biotite in the carbonatite of 544±7 million years old (Xu, 1996).

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Standard Detailed Strunz Dana Chemical Elements

Mineral List


22 valid minerals.

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:

Anatase
Formula: TiO2
Reference: Joekel, R.M.; Nickeln, B.L. & Wally, K.D., 2007, “Late Paleozoic Weathering and Residual Acccumulation of Minerals on Elk Creek Carbonatites, Southeastern Nebraska, USA”, Paper No. 55-26, 2007 GSA Denver Annual Meeting (28–31 October 2007).
Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Reference: Carlson, M.P. & S.B. Treves, 2005, “The Elk Creek Carbonatite, Southeastern Nebraska – An Overview”, Natural Resources Research, vol. 14 No.1.
'Apatite'
Reference: Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Baryte
Formula: BaSO4
Reference: Carlson, M.P. & S.B. Treves, 2005, “The Elk Creek Carbonatite, Southeastern Nebraska – An Overview”, Natural Resources Research, vol. 14 No.1. ; Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
'Bastnäsite'
Reference: USGS Open File report 2010-5220; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Calcite
Formula: CaCO3
Reference: Carlson, M.P. & S.B. Treves, 2005, “The Elk Creek Carbonatite, Southeastern Nebraska – An Overview”, Natural Resources Research, vol. 14 No.1. ; Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21
'Carbonatite'
Reference: U.S. Geological Survey, (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Chalcopyrite
Formula: CuFeS2
Reference: Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21
'Chlorite Group'
Reference: Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Joekel, R.M.; Nickeln, B.L. & Wally, K.D., 2007, “Late Paleozoic Weathering and Residual Acccumulation of Minerals on Elk Creek Carbonatites, Southeastern Nebraska, USA”, Paper No. 55-26, 2007 GSA Denver Annual Meeting (28–31 October 2007).
Dolomite
Formula: CaMg(CO3)2
Reference: Carlson, M.P. & S.B. Treves, 2005, “The Elk Creek Carbonatite, Southeastern Nebraska – An Overview”, Natural Resources Research, vol. 14 No.1. ; Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Joekel, R.M.; Nickeln, B.L. & Wally, K.D., 2007, “Late Paleozoic Weathering and Residual Acccumulation of Minerals on Elk Creek Carbonatites, Southeastern Nebraska, USA”, Paper No. 55-26, 2007 GSA Denver Annual Meeting (28–31 October 2007).
Fluorite
Formula: CaF2
Reference: Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Galena
Formula: PbS
Reference: Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21
Goethite
Formula: α-Fe3+O(OH)
Reference: Joekel, R.M.; Nickeln, B.L. & Wally, K.D., 2007, “Late Paleozoic Weathering and Residual Acccumulation of Minerals on Elk Creek Carbonatites, Southeastern Nebraska, USA”, Paper No. 55-26, 2007 GSA Denver Annual Meeting (28–31 October 2007).
Hematite
Formula: Fe2O3
Reference: Carlson, M.P. & S.B. Treves, 2005, “The Elk Creek Carbonatite, Southeastern Nebraska – An Overview”, Natural Resources Research, vol. 14 No.1. ; Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Ilmenite
Formula: Fe2+TiO3
Reference: Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
'K Feldspar'
Reference: Joekel, R.M.; Nickeln, B.L. & Wally, K.D., 2007, “Late Paleozoic Weathering and Residual Acccumulation of Minerals on Elk Creek Carbonatites, Southeastern Nebraska, USA”, Paper No. 55-26, 2007 GSA Denver Annual Meeting (28–31 October 2007). ; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
'Monazite'
Reference: USGS Open File report 2010-5220; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Joekel, R.M.; Nickeln, B.L. & Wally, K.D., 2007, “Late Paleozoic Weathering and Residual Acccumulation of Minerals on Elk Creek Carbonatites, Southeastern Nebraska, USA”, Paper No. 55-26, 2007 GSA Denver Annual Meeting (28–31 October 2007).
Muscovite var: Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
Reference: Joekel, R.M.; Nickeln, B.L. & Wally, K.D., 2007, “Late Paleozoic Weathering and Residual Acccumulation of Minerals on Elk Creek Carbonatites, Southeastern Nebraska, USA”, Paper No. 55-26, 2007 GSA Denver Annual Meeting (28–31 October 2007).
Nepheline
Formula: Na3K(Al4Si4O16)
Reference: Joekel, R.M.; Nickeln, B.L. & Wally, K.D., 2007, “Late Paleozoic Weathering and Residual Acccumulation of Minerals on Elk Creek Carbonatites, Southeastern Nebraska, USA”, Paper No. 55-26, 2007 GSA Denver Annual Meeting (28–31 October 2007).
'Parisite'
Reference: USGS Open File report 2010-5220; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: Carlson, M.P. & S.B. Treves, 2005, “The Elk Creek Carbonatite, Southeastern Nebraska – An Overview”, Natural Resources Research, vol. 14 No.1. ; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Pyrite
Formula: FeS2
Reference: Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21
Pyrochlore Group
Formula: A2Nb2(O,OH)6Z
Reference: Carlson, M.P. & S.B. Treves, 2005, “The Elk Creek Carbonatite, Southeastern Nebraska – An Overview”, Natural Resources Research, vol. 14 No.1. ; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Quartz
Formula: SiO2
Reference: Carlson, M.P. & S.B. Treves, 2005, “The Elk Creek Carbonatite, Southeastern Nebraska – An Overview”, Natural Resources Research, vol. 14 No.1. ; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
Rutile
Formula: TiO2
Reference: Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Reference: Carlson, M.P. & S.B. Treves, 2005, “The Elk Creek Carbonatite, Southeastern Nebraska – An Overview”, Natural Resources Research, vol. 14 No.1.
Sphalerite
Formula: ZnS
Reference: Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21
'Synchysite Group'
Reference: USGS Open File report 2010-5220; Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Chalcopyrite'2.CB.10aCuFeS2
'Galena'2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 3 - Halides
'Fluorite'3.AB.25CaF2
Group 4 - Oxides and Hydroxides
'Anatase'4.DD.05TiO2
'Goethite'4.00.α-Fe3+O(OH)
'Hematite'4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Pyrochlore Group4.00.A2Nb2(O,OH)6Z
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
'Ankerite'5.AB.10Ca(Fe2+,Mg)(CO3)2
'Calcite'5.AB.05CaCO3
'Dolomite'5.AB.10CaMg(CO3)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Baryte'7.AD.35BaSO4
Group 8 - Phosphates, Arsenates and Vanadates
'Fluorapatite'8.BN.05Ca5(PO4)3F
Group 9 - Silicates
'Clinochlore'9.EC.55Mg5Al(AlSi3O10)(OH)8
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Illite9.EC.15K0.65Al2.0[Al0.65Si3.35O10](OH)2
Nepheline9.FA.05Na3K(Al4Si4O16)
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Bastnäsite'-
'Carbonatite'-
'Chlorite Group'-
K Feldspar-
Monazite-
Parisite-
Serpentine Subgroup-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Synchysite Group-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Anatase4.4.4.1TiO2
Rutile4.4.1.1TiO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
A2B2O6(O,OH,F)
Pyrochlore Group8.2.1.1A2Nb2(O,OH)6Z
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
var: Illite71.2.2d.2K0.65Al2.0[Al0.65Si3.35O10](OH)2
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework Feldspathoids and related species
Nepheline76.2.1.2Na3K(Al4Si4O16)
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Bastnäsite'-
'Carbonatite'-
'Chlorite Group'-
'K Feldspar'-
'Monazite'-
'Parisite'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
'Synchysite Group'-

List of minerals for each chemical element

HHydrogen
H ClinochloreMg5Al(AlSi3O10)(OH)8
H Goethiteα-Fe3+O(OH)
H Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H PhlogopiteKMg3(AlSi3O10)(OH)2
H Pyrochlore GroupA2Nb2(O,OH)6Z
H Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
CCarbon
C AnkeriteCa(Fe2+,Mg)(CO3)2
C CalciteCaCO3
C DolomiteCaMg(CO3)2
OOxygen
O AnataseTiO2
O AnkeriteCa(Fe2+,Mg)(CO3)2
O BaryteBaSO4
O CalciteCaCO3
O ClinochloreMg5Al(AlSi3O10)(OH)8
O DolomiteCaMg(CO3)2
O FluorapatiteCa5(PO4)3F
O Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
O IlmeniteFe2+TiO3
O MagnetiteFe2+Fe23+O4
O MuscoviteKAl2(AlSi3O10)(OH)2
O NephelineNa3K(Al4Si4O16)
O PhlogopiteKMg3(AlSi3O10)(OH)2
O Pyrochlore GroupA2Nb2(O,OH)6Z
O QuartzSiO2
O RutileTiO2
O Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
FFluorine
F FluorapatiteCa5(PO4)3F
F FluoriteCaF2
NaSodium
Na NephelineNa3K(Al4Si4O16)
MgMagnesium
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg DolomiteCaMg(CO3)2
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
AlAluminium
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al NephelineNa3K(Al4Si4O16)
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
SiSilicon
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si NephelineNa3K(Al4Si4O16)
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si QuartzSiO2
Si Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S BaryteBaSO4
S ChalcopyriteCuFeS2
S GalenaPbS
S PyriteFeS2
S SphaleriteZnS
KPotassium
K Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
K NephelineNa3K(Al4Si4O16)
K PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
Ca FluorapatiteCa5(PO4)3F
Ca FluoriteCaF2
TiTitanium
Ti AnataseTiO2
Ti IlmeniteFe2+TiO3
Ti RutileTiO2
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe ChalcopyriteCuFeS2
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
Fe IlmeniteFe2+TiO3
Fe MagnetiteFe2+Fe23+O4
Fe PyriteFeS2
Fe Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Zn SphaleriteZnS
NbNiobium
Nb Pyrochlore GroupA2Nb2(O,OH)6Z
BaBarium
Ba BaryteBaSO4
PbLead
Pb GalenaPbS

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

Paleozoic
251.902 - 541 Ma



ID: 3187973
Paleozoic sedimentary rocks

Age: Phanerozoic (251.902 - 541 Ma)

Lithology: Sedimentary rocks

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]

Pennsylvanian
298.9 - 323.2 Ma



ID: 2965891
Wabaunsee Group

Age: Pennsylvanian (298.9 - 323.2 Ma)

Stratigraphic Name: Wabaunsee Group

Description: Shale, sandstone, and interbedded limestone. Shale is light gray to dark gray, greenish gray, red, or black; contains very thin layers of siltstone; locally very fossiliferous, carbonaceous. Sandstone is brownish gray to yellowish gray, or gray, argillaceous , and micaceous. Limestone is dark gray to medium gray, yellowish gray, thin bedded to thick bedded; very fossiliferous. Contains coal beds less than 1 ft. thick. Approx. max thickness 300 ft

Comments: Includes in decending order: Wood Siding Formation, Root Shale, Stotler Limestone, Pillsbury Shale, Zeandale Limestone, Willard Shale, Emporia Limestone, Auburn Shale, Wakarusa Limestone, Solider Creek Shale, Burlingame Limestone, Scronton Shale, Howard Limestone, and Severy Shale.

Lithology: Major:{shale,sandstone,limestone}, Incidental:{siltstone, coal}

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]

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

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Carlson, M.P. & S.B. Treves, 2005, “The Elk Creek Carbonatite, Southeastern Nebraska – An Overview”, Natural Resources Research, vol. 14 No.1.
Joekel, R.M.; Nickeln, B.L. & Wally, K.D., 2007, “Late Paleozoic Weathering and Residual Acccumulation of Minerals on Elk Creek Carbonatites, Southeastern Nebraska, USA”, Paper No. 55-26, 2007 GSA Denver Annual Meeting (28–31 October 2007).
Kettler, Richard M., Blessington, Michael Joseph, Verplanck, Philip L., And Farmer, G. Lang (2014) The Elk Creek Carbonatite Complex. Geological Society of America Abstracts with Programs. Vol. 46, No. 4, p.21
Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466–467.
USGS Open File report 2010-5220
Xu, A-S., (1996) Mineralogy, petrology, geochemistry and origin of the Elk Creek Carbonatite, Nebraska: Lincoln, Nebr. University of Nebraska, Ph.D. dissertation, 299 p.
Blessington, Michael J., 2014, A Niobium Deposit Hosted by a Magnetite-Dolomite Carbonatite, Elk Creek Carbonatite Complex, Nebraska, USA, University of Nebraska M.S. Thesis.

External Links

http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1063&context=geoscidiss - Blessington, 2014, Elk Creek Carbonatite M.S. Thesis


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