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:
Metropolitan, Menominee Iron Range, Dickinson Co., Michigan, USA

Oldest recorded age at locality: 1703.29
Youngest recorded age at locality: 1507.51

mindat Locality ID: 280137
mindat URL: http://www.mindat.org/loc-280137.html

Tectonic Settings:

Total number of sublocalities beneath "Metropolitan, Menominee Iron Range, Dickinson Co., Michigan, USA": 1
Total number of bottom-level sublocalities: 1

Number of Child Localities: 1
Child Localities:
Metropolitan Mine

Latitude: 46°0'0"N
Longitude: 87°54'"W
Decimal Degree (lat, lon): 46,-87.9

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The 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.

Amphibole	Calcite	Corundum	Diaspore	None	Pyroxene	Quartz	Spinel

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: C Ca Fe H Mg O Si

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Amphibole Calcite Corundum Diaspore None Pyroxene Quartz Spinel

7 IMA Minerals at location:

Calcite ()*	Diopside ()*	Goethite ()*	Hematite ()*	Magnetite ()*
Quartz ()*	Tremolite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Calcite ()*	Calcite	Ca(CO₃)	1703.29	1507.51	1	220275	27770
Diopside ()*	Pyroxene	CaMgSi₂O₆	1703.29	1507.51	1	220275	4135
Goethite ()*	Diaspore	FeO(OH)	1703.29	1507.51	1	220275	7437
Hematite ()*	Corundum	Fe₂O₃	1703.29	1507.51	1	220275	14640
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	1703.29	1507.51	1	220275	14899
Quartz ()*	Quartz	SiO₂	1703.29	1507.51	1	220275	61156
Tremolite ()*	Amphibole	Ca₂(Mg_5.0-4.5Fe²⁺_0.0-0.5)Si₈O₂₂(OH)₂	1703.29	1507.51	1	220275	2562

3 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Sample Source	Dated Mineral	MinDat Locality ID	Dated Locality (Max Age)	Reference	Reference ID
USGS-Rb-Sr-00912	1556.45	1556.45	1556.45	Rb-Sr	initial age disturbed by later metamorphism	biotite		16267	Metropolitan Mine, Metropolitan, Menominee Iron Range, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00913	1703.29	1703.29	1703.29	Rb-Sr	initial age disturbed by later metamorphism	muscovite	Muscovite	16267	Metropolitan Mine, Metropolitan, Menominee Iron Range, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00915	1507.51	1507.51	1507.51	Rb-Sr	initial age disturbed by later metamorphism	biotite		16267	Metropolitan Mine, Metropolitan, Menominee Iron Range, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...