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:
Ajo Area, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA

Oldest recorded age at locality: 63
Youngest recorded age at locality: 14.98

mindat Locality ID: 42873
mindat URL: http://www.mindat.org/loc-42873.html

Tectonic Settings:

Total number of sublocalities beneath "Ajo Area, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA": 2
Total number of bottom-level sublocalities: 1

Number of Child Localities: 1
Child Localities:
Batamote Mts

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.

Aragonite	Corundum	Feldspar	Fornacite	None	Pseudobrookite	Pyroxene	Rocksalt	Tridymite

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: Ag Al As C Ca Cl Cr Cu Fe H K Mg O Pb Si Ti

Elements from minerals reported directly at this locality: Ag As C Cl Cr Cu H O Pb

Structural Groups for minerals in this locality:
Aragonite Corundum Feldspar Fornacite None Pseudobrookite Pyroxene Rocksalt Tridymite

10 IMA Minerals at location:

Augite ()*	Cerussite ()*	Chlorargyrite ()*	Enstatite ()*	Fornacite ()*
Hematite ()*	Ilmenite ()*	Pseudobrookite ()*	Sanidine ()*	Tridymite ()*

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
Augite ()*	Pyroxene	(Ca,Mg,Fe)₂Si₂O₆	63	63	1	143451	2060
Cerussite ()*	Aragonite	Pb(CO₃)	16.06	14.98	0		4979
Chlorargyrite ()*	Rocksalt	AgCl	16.06	14.98	0		1382
Enstatite ()*	Pyroxene	Mg₂Si₂O₆	63	63	1	143451	944
Fornacite ()*	Fornacite	CuPb₂(CrO₄)(AsO₄)(OH)	16.06	14.98	0		85
Hematite ()*	Corundum	Fe₂O₃	63	63	1	143451	14640
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃	63	63	1	143451	5433
Pseudobrookite ()*	Pseudobrookite	(Fe³⁺₂Ti)O₅	63	63	1	143451	164
Sanidine ()*	Feldspar	K(AlSi₃O₈)	16.06	14.98	1	143450	598
Tridymite ()*	Tridymite	SiO₂	63	63	1	143451	458

4 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	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
EG94_211-00047	63	63	63	Pb-Pb	whole rock?	805	Yes	3370	New Cornelia Mine (Ajo Mine), Ajo, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA	Ajo	Bouse et al. (1999)	10.2113/gsecongeo.94.2.211	EG94_211
EG94_211-00048	63	63	63	Pb-Pb	whole rock?	806	Yes	3370	New Cornelia Mine (Ajo Mine), Ajo, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA	Ajo	Bouse et al. (1999)	10.2113/gsecongeo.94.2.211	EG94_211
EG94_211-00049	63	63	63	Pb-Pb	whole rock?	214	Yes	3370	New Cornelia Mine (Ajo Mine), Ajo, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA	Ajo	Bouse et al. (1999)	10.2113/gsecongeo.94.2.211	EG94_211
Giersdorf_00000446	16.06	14.98	15.52±0.54	K-Ar		UAKA-72-64		43662	Batamote Mts, Ajo Area, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA	Batamote Hills	Shafiqullah et al. (1980)		AGSD12_201

All locality data graciously provided by mindat.org

All age data...