Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org



The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.


Locality Name:
Iron Mountain Complex, Fremont Co., Colorado, USA

Oldest recorded age at locality: 540
Youngest recorded age at locality: 506

mindat Locality ID: 122859
mindat URL: http://www.mindat.org/loc-122859.html

Tectonic Settings:

Total number of sublocalities beneath "Iron Mountain Complex, Fremont Co., Colorado, USA": 5
Total number of bottom-level sublocalities: 4

Number of Child Localities: 2
Child Localities:
Iron Mountain
McClure Mountain

Latitude: 38°20'57"N
Longitude: 105°26'19"W
Decimal Degree (lat, lon): 38.349166666667,-105.43861111111
AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
This mineral's age has not yet been recorded.

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Al Ba C Ca Ce Cl Cu F Fe H K Mg Na Ni O P S Si Sr Th Ti Zn Zr 

Elements from minerals reported directly at this locality: Al Ca Fe H Mg Na O Si 

Structural Groups for minerals in this locality: 
AmphiboleAncyliteAragoniteBaryteBastnäsiteCalciteCancriniteCancrinite-sodaliteChalcopyriteClay
CorundumDiasporeFeldsparLepidocrociteMicaNickelineNonePerovskitePyritePyroxene
RhabdophaneRutileSodaliteSphaleriteSpinelTitaniteTridymiteZircon

37 IMA Minerals at location:
Aegirine  (*)Ancylite-(Ce)  (*)Ankerite  (*)Anorthite  (*)Augite  (*)
Baryte  (*)Bastnäsite-(Ce)  (*)Brockite  (*)Calcite  (*)Cancrinite  (*)
Chalcopyrite  (*)Cryolite  (*)Diaspore  (*)Diopside  (*)Dolomite  (*)
Hercynite  (*)Ilmenite  (*)Kaersutite  (*)Lepidocrocite  (*)Magnesio-hastingsite  (*)
Magnetite  (*)Nepheline  (*)Phlogopite  (*)Pyrite  (*)Pyrrhotite  (*)
Riebeckite  (*)Rutile  (*)Smythite  (*)Sodalite  (*)Sphalerite  (*)
Spinel  (*)Strontianite  (*)Synchysite-(Ce)  (*)Thorite  (*)Titanite  (*)
Ulvöspinel  (*)Zircon  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Aegirine  (*)PyroxeneNaFe3+Si2O65405062188467,1884681022
Ancylite-(Ce)  (*)AncyliteCeSr(CO3)2(OH)·H2O540506118846892
Ankerite  (*)NoneCa(Fe2+,Mg)(CO3)25405062188468,1884713092
Anorthite  (*)FeldsparCa(Al2Si2O8)54050611884671036
Augite  (*)Pyroxene(Ca,Mg,Fe)2Si2O654050611884672060
Baryte  (*)BaryteBa(SO4)5405062188468,18847111547
Bastnäsite-(Ce)  (*)BastnäsiteCe(CO3)F5405061188467304
Brockite  (*)Rhabdophane(Ca,Th,Ce)(PO4)·H2O5405062188468,18847148
Calcite  (*)CalciteCa(CO3)5405062188468,18847127770
Cancrinite  (*)Cancrinite(Na,Ca,   )8(Al6Si6)O24(CO3,SO4)2·2H2O5405062188468,188471232
Chalcopyrite  (*)ChalcopyriteCuFeS25405063188467,188468,18847127198
Cryolite  (*)PerovskiteNa2NaAlF65405062188468,18847150
Diaspore  (*)DiasporeAlO(OH)5405062188468,188471481
Diopside  (*)PyroxeneCaMgSi2O654050604135
Dolomite  (*)NoneCaMg(CO3)25405062188468,1884719895
Hercynite  (*)SpinelFe2+Al2O45405061188467407
Ilmenite  (*)CorundumFe2+Ti4+O354050611884675433
Kaersutite  (*)AmphiboleNaCa2(Mg3AlTi4+)(Si6Al2)O22O25405062188467,188468179
Lepidocrocite  (*)LepidocrociteFe3+O(OH)5405062188468,188471581
Magnesio-hastingsite  (*)AmphiboleNaCa2(Mg4Fe3+)(Si6Al2)O22(OH)2540506080
Magnetite  (*)SpinelFe2+Fe3+2O4540506118846714899
Nepheline  (*)TridymiteNa3K(Al4Si4O16)5405062188467,188468884
Phlogopite  (*)Mica ClayKMg3(AlSi3O10)(OH)254050611884682273
Pyrite  (*)PyriteFeS25405063188467,188468,18847139462
Pyrrhotite  (*)NickelineFe7S854050611884679056
Riebeckite  (*)Amphibole   Na2(Fe2+3Fe3+2)Si8O22(OH)25405061188468375
Rutile  (*)RutileTiO25405063188467,188468,1884715614
Smythite  (*)None(Fe,Ni)3+xS4 (x ≈ 0-0.3)540506118846777
Sodalite  (*)Cancrinite-sodalite SodaliteNa4(Si3Al3)O12Cl5405061188468444
Sphalerite  (*)SphaleriteZnS5405062188468,18847121482
Spinel  (*)SpinelMgAl2O454050611884671934
Strontianite  (*)AragoniteSr(CO3)5405062188468,188471589
Synchysite-(Ce)  (*)NoneCaCe(CO3)2F5405063188468,188470,188471232
Thorite  (*)ZirconTh(SiO4)5405063188468,188469,1884711006
Titanite  (*)TitaniteCaTi(SiO4)O50650611884684899
Ulvöspinel  (*)SpinelFe2+2TiO45405063188467,188468,188471120
Zircon  (*)ZirconZr(SiO4)54050611884675251


Locality Notes from all Ages at Locality:
Age IDLocality Notes
Jen_0000893MAGMATIC STYLE: Dykes. ASSOCIATED SILICATE ROCKS: Pyroxenite, dunite, gabbro, ijolite, nepheline syenite, trachyte, phonolite, lamprophyre, fenite.
Jen_0000894MAGMATIC STYLE: Dykes. ASSOCIATED SILICATE ROCKS: Pyroxenite, dunite, gabbro, ijolite, nepheline syenite, trachyte, phonolite, lamprophyre, fenite.
Jen_0000895MAGMATIC STYLE: Dykes. ASSOCIATED SILICATE ROCKS: Pyroxenite, dunite, gabbro, ijolite, nepheline syenite, trachyte, phonolite, lamprophyre, fenite.
Jen_0000896MAGMATIC STYLE: Dykes. ASSOCIATED SILICATE ROCKS: Pyroxenite, dunite, gabbro, ijolite, nepheline syenite, trachyte, phonolite, lamprophyre, fenite.
Jen_0000897MAGMATIC STYLE: Dykes. ASSOCIATED SILICATE ROCKS: Pyroxenite, dunite, gabbro, ijolite, nepheline syenite, trachyte, phonolite, lamprophyre, fenite.
Jen_0000898MAGMATIC STYLE: Dykes. ASSOCIATED SILICATE ROCKS: Pyroxenite, dunite, gabbro, ijolite, nepheline syenite, trachyte, phonolite, lamprophyre, fenite.


6 Ages assigned to this locality:

Excel IDMax Age (Ma)Min Age (Ma)Age as listed in referenceDating MethodAge InterpretPrioritized?Sample SourceSample NumRun NumAge from other LocalityDated MineralMinerals explicitely stated as having this ageAge applies to these ElementsMinDat Locality IDDated Locality (Max Age)Location as listed in referenceReferenceReference DOIReference IDAge Notes
Jen_0000893528528528K-Ar amphibole, biotite     122863McClure Gulch Carbonatite Dike, McClure Mountain, Iron Mountain Complex, Fremont Co., Colorado, USAMcClure MountainWoolley and Kjarsgaard (2008)10.4095/225115GSCOF5796 
Jen_0000894520520520K-Ar       122863McClure Gulch Carbonatite Dike, McClure Mountain, Iron Mountain Complex, Fremont Co., Colorado, USAMcClure MountainWoolley and Kjarsgaard (2008)10.4095/225115GSCOF5796 
Jen_0000895508508508K-Ar       122863McClure Gulch Carbonatite Dike, McClure Mountain, Iron Mountain Complex, Fremont Co., Colorado, USAMcClure MountainWoolley and Kjarsgaard (2008)10.4095/225115GSCOF5796 
Jen_0000896521521521Rb-Sr       122863McClure Gulch Carbonatite Dike, McClure Mountain, Iron Mountain Complex, Fremont Co., Colorado, USAMcClure MountainWoolley and Kjarsgaard (2008)10.4095/225115GSCOF5796 
Jen_0000897540530535±5Rb-Sr       122863McClure Gulch Carbonatite Dike, McClure Mountain, Iron Mountain Complex, Fremont Co., Colorado, USAMcClure MountainWoolley and Kjarsgaard (2008)10.4095/225115GSCOF5796 
Jen_0000898506506506fission-track titanite   Titanite  122863McClure Gulch Carbonatite Dike, McClure Mountain, Iron Mountain Complex, Fremont Co., Colorado, USAMcClure MountainWoolley and Kjarsgaard (2008)10.4095/225115GSCOF5796 

SampleSource LocalityReference URL

All locality data graciously provided by mindat.org

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