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:
Democrat Creek Alkalic Complex, Fremont Co., Colorado, USA

Oldest recorded age at locality: 534
Youngest recorded age at locality: 511

mindat Locality ID: 159375
mindat URL: http://www.mindat.org/loc-159375.html

Tectonic Settings:

Total number of sublocalities beneath "Democrat Creek Alkalic Complex, Fremont Co., Colorado, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 0°0'0"N
Longitude: 0°0'0"E
Decimal Degree (lat, lon): 0,0

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.

Baryte	None	Zircon

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: Ba O P S Y

Elements from minerals reported directly at this locality: Ba O P S Y

Structural Groups for minerals in this locality:
Baryte None Zircon

2 IMA Minerals at location:

Baryte ()*	Xenotime-(Y) ()*

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
Baryte ()*	Baryte	Ba(SO₄)	534	511	0		11547
Xenotime-(Y) ()*	Zircon	Y(PO₄)	534	511	0		939

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Jen_0000886	MAGMATIC STYLE: Dykes. ASSOCIATED SILICATE ROCKS: Pyroxenite, gabbro, dolerite, quartz syenite, lamprophyre, breccia.
Jen_0000887	MAGMATIC STYLE: Dykes. ASSOCIATED SILICATE ROCKS: Pyroxenite, gabbro, dolerite, quartz syenite, lamprophyre, breccia.
Jen_0000888	MAGMATIC STYLE: Dykes. ASSOCIATED SILICATE ROCKS: Pyroxenite, gabbro, dolerite, quartz syenite, lamprophyre, breccia.

3 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Sample Source	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID
Jen_0000886	511	511	511±8	Rb-Sr	whole rock	159375	Democrat Creek Alkalic Complex, Fremont Co., Colorado, USA	Democrat Creek	Woolley and Kjarsgaard (2008)	10.4095/225115	GSCOF5796
Jen_0000887	512	512	512	K-Ar	biotite	159375	Democrat Creek Alkalic Complex, Fremont Co., Colorado, USA	Democrat Creek	Woolley and Kjarsgaard (2008)	10.4095/225115	GSCOF5796
Jen_0000888	534	534	534	K-Ar	hornblende	159375	Democrat Creek Alkalic Complex, Fremont Co., Colorado, USA	Democrat Creek	Woolley and Kjarsgaard (2008)	10.4095/225115	GSCOF5796

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...