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:
Stepninsk Ore Field, Kempirsai Cr Deposit, Kargaly, Aktobe Region, Kazakhstan

Oldest recorded age at locality: 427
Youngest recorded age at locality: 357.6

mindat Locality ID: 204457
mindat URL: http://www.mindat.org/loc-204457.html

Tectonic Settings:

Total number of sublocalities beneath "Stepninsk Ore Field, Kempirsai Cr Deposit, Kargaly, Aktobe Region, Kazakhstan": 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.

None	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: Cr Fe O

Elements from minerals reported directly at this locality: Cr Fe O

Structural Groups for minerals in this locality:
None Spinel

1 IMA Minerals at location:

Chromite ()*

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
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	427	357.6	0		3902

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Alexandra-0078	western part
Alexandra-0079	Diamond Pearl mine
Alexandra-0080	Diamond Pearl mine

4 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Sample Source	Age from other Locality	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID
Alexandra-0077	427	394	427-394	Sm-Nd	Age of rock		Yes	185521	Kempirsai Cr Deposit, Kargaly, Aktobe Region, Kazakhstan	Kempirsai massif	Melcher et al. (1999)	10.1007/s001260050202	MD34_250
Alexandra-0078	377.6	374.4	376 ± 1.6	Rb-Sr	Age of rock	amphibole, phlogopite, apatite	Yes	185521	Kempirsai Cr Deposit, Kargaly, Aktobe Region, Kazakhstan	Kempirsai massif	Melcher et al. (1999)	10.1007/s001260050202	MD34_250
Alexandra-0079	394.6	376.2	385.4 ± 9.2	Ar-Ar	Age of rock	amphibole	Yes	185521	Kempirsai Cr Deposit, Kargaly, Aktobe Region, Kazakhstan	Kempirsai massif	Melcher et al. (1999)	10.1007/s001260050202	MD34_250
Alexandra-0080	373.6	357.6	365.6 ± 8	Ar-Ar	Age of rock	amphibole	Yes	185521	Kempirsai Cr Deposit, Kargaly, Aktobe Region, Kazakhstan	Kempirsai massif	Melcher et al. (1999)	10.1007/s001260050202	MD34_250

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...