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:
Clis, Guérande, Loire-Atlantique, Pays De La Loire, France

Oldest recorded age at locality: 290
Youngest recorded age at locality: 210

mindat Locality ID: 292302
mindat URL: http://www.mindat.org/loc-292302.html

Tectonic Settings:

Total number of sublocalities beneath "Clis, Guérande, Loire-Atlantique, Pays De La Loire, France": 0
Total number of bottom-level sublocalities: 0

Latitude: 47°20'5"N
Longitude: 2°27'57"W
Decimal Degree (lat, lon): 47.334722222222,-2.4658333333333

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.

Feldspar	Garnet	None	Quartz

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 Fe K O Si

Elements from minerals reported directly at this locality: Al Fe K O Si

Structural Groups for minerals in this locality:
Feldspar Garnet None Quartz

3 IMA Minerals at location:

Almandine ()*	Orthoclase ()*	Quartz ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Almandine ()*	Garnet	Fe²⁺₃Al₂(SiO₄)₃	290	210	2353
Orthoclase ()*	Feldspar	K(AlSi₃O₈)	290	210	2349
Quartz ()*	Quartz	SiO₂	290	210	61156

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Giersdorf_00000661	The Penaran Mine is located in the Guérande mining district and is part of the Armorican Massif. It has produced 470 tons of Uranium metal.
Giersdorf_00000661a	The Penaran Mine is located in the Guérande mining district and is part of the Armorican Massif. It has produced 470 tons of Uranium metal.

2 Ages assigned to this locality:

	Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Source	Sample Num	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	Giersdorf_00000661	290	270	290-270	U-Pb	The age of mineralization being post-cooling of the 300-340 Ma granite bodies restricts the formation of the Uranium minerals to being genetically derived.					Yes			U	292955	Pen Ar Ran, Piriac-sur-Mer, Loire-Atlantique, Pays De La Loire, France	Penaran Mine	Chauris et al. (1994)		PMGFRA_243	Age of the uranium mineralization in the Armorican Massif is associated with Hercynian peraluminous granites. From pg. 262: "The precise chronology of these mineralizations is not well established. The uranium veins appear to be the oldest (290-270 Ma by U/Pb dating) but underwent late remobilization processes."
	Giersdorf_00000661a	230	210	230-210	K-Ar	The age of mineralization being post-cooling of the 300-340 Ma granite bodies restricts the formation of the Uranium minerals to being genetically derived.					Yes			Pb, Zn	292955	Pen Ar Ran, Piriac-sur-Mer, Loire-Atlantique, Pays De La Loire, France	Penaran Mine	Chauris et al. (1994)		PMGFRA_243	from pg 262: "The lead-zinc veins (230-210 Ma, K-Ar dating) seem to be the youngest and the antimony veins are of intermediate age"

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...