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:
St Dennis, St Austell, Cornwall, England, UK

Oldest recorded age at locality: 311
Youngest recorded age at locality: 273

mindat Locality ID: 295698
mindat URL: http://www.mindat.org/loc-295698.html

Tectonic Settings:

Total number of sublocalities beneath "St Dennis, St Austell, Cornwall, England, UK": 2
Total number of bottom-level sublocalities: 2

Number of Child Localities: 2
Child Localities:
Goss Moor
St Dennis Crown Mine

Latitude: 50°12'6"N
Longitude: 4°56'27"W
Decimal Degree (lat, lon): 50.201666666667,-4.9408333333333

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.

Chalcopyrite	None	Quartz	Rocksalt	Rutile

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: Cu Fe O Pb S Si Sn

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Chalcopyrite None Quartz Rocksalt Rutile

4 IMA Minerals at location:

Cassiterite ()*	Chalcopyrite ()*	Galena ()*	Quartz ()*

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
Cassiterite ()*	Rutile	SnO₂	311	273	1	118476	5171
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	311	273	1	118475	27198
Galena ()*	Rocksalt	PbS	311	273	1	118475	24243
Quartz ()*	Quartz	SiO₂	311	273	1	118475	61156

6 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	Age from other Locality	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
Lucy_027a	311	285	298 ± 13	Rb-Sr	Age granite intruded			MR 29628, E 35053, E 35051, E 35052, MR 30149, MR	Yes	222082	St Austell, Cornwall, England, UK	St Austell granite	Darbyshire et al. (1985)	10.1144/gsjgs.142.6.1159	JGSL142_1159	Age stated from earlier paper
Lucy_027b	289	281	285 ± 4	Rb-Sr	Preferred Age determined in study	high		MR 29628, E 35053, E 35051, E 35052, MR 30149, MR	Yes	222082	St Austell, Cornwall, England, UK	St Austell granite	Darbyshire et al. (1985)	10.1144/gsjgs.142.6.1159	JGSL142_1159	8 samples have been reanalysed. Regression of all the data gives an age of 285 ± 4
Lucy_027c	294	282	288 ± 6	Rb-Sr	Age granite intruded			MR 29628, E 35053, E 35051, MR 30149, MR 30150, MR	Yes	222082	St Austell, Cornwall, England, UK	St Austell granite	Darbyshire et al. (1985)	10.1144/gsjgs.142.6.1159	JGSL142_1159	Omitting the lithium mica granite sample from the regression makes little difference to the value of the age and intercept but beecause of the reduced spread in Rb/Sr ratiosn the errors are slightly increased.
Lucy_027d	296	284	290	Rb-Sr	Preliminary examindation yields age of St Austells granite as the first episode of Hercynian Magmatism.				Yes	222082	St Austell, Cornwall, England, UK	St Austell granite	Darbyshire et al. (1985)	10.1144/gsjgs.142.6.1159	JGSL142_1159	Statistically acceptable whole rock and/or mineral isochrons were obtained for each of the granites studies and a preliminary inspection of the tata may suggst several episodes of of Hercynian magmatism in SW England. The first, c.. 290 generated the Carnmenellis, Bodmin and St Austell granites and was succeeded some 10 Ma by the Dartmoor grantie, and finally the intrusion of the Land's End granite at 270 Ma. The emplacement of the porphyry dyke and the main phase of mineralization, would then be closely associated with the second and third magmatic episodes. However more detailed examintation of the data and comparison with other work reveals certain major discrepencies in the hypothesis.
Lucy_028	301	275	288 ± 13	Rb/Sr	Age for granite		whole rock		Yes	222082	St Austell, Cornwall, England, UK	St Austell granite	Hawkes et al. (1978		US4_52
Lucy_029	297	273	285 ± 12	87Sr/86Sr	Age for granite				Yes	222082	St Austell, Cornwall, England, UK	St Austell granite	Hawkes et al. (1978)		US4_52

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...