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:
Main Pit, Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China

Oldest recorded age at locality: 2070
Youngest recorded age at locality: 541

mindat Locality ID: 143972
mindat URL: http://www.mindat.org/loc-143972.html

Tectonic Settings:

Total number of sublocalities beneath "Main Pit, Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China": 0
Total number of bottom-level sublocalities: 0

Latitude: 41°47'53"N
Longitude: 109°57'56"E
Decimal Degree (lat, lon): 41.798055555556,109.96555555556

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.

Amphibole	Baryte	Bastnäsite	Calcite	Clay	Columbite	Corundum	Fluorite	Mica	Monazite
None	Parisite	Pyroxene	Spinel

Aegirine ()*	Baryte ()*	Bastnäsite-(Ce) ()*	Calcite ()*	Diopside ()*
Dolomite ()*	Fersmite ()*	Fluorite ()*	Hematite ()*	Huanghoite-(Ce) ()*
Magnetite ()*	Monazite-(Ce) ()*	Parisite-(Ce) ()*	Phlogopite ()*	Riebeckite ()*

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 Ba C Ca Ce F Fe H K Mg Na Nb O P S Si Ta Ti

Elements from minerals reported directly at this locality: Al Ba C Ca Ce F Fe H K Mg Na Nb O P S Si

Structural Groups for minerals in this locality:
Amphibole Baryte Bastnäsite Calcite Clay Columbite Corundum Fluorite Mica Monazite
None Parisite Pyroxene Spinel

15 IMA Minerals at location:

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Aegirine ()*	Pyroxene	NaFe³⁺Si₂O₆	1600	541	1022
Baryte ()*	Baryte	Ba(SO₄)	1600	541	11547
Bastnäsite-(Ce) ()*	Bastnäsite	Ce(CO₃)F	1600	541	304
Calcite ()*	Calcite	Ca(CO₃)	1600	541	27770
Diopside ()*	Pyroxene	CaMgSi₂O₆	1600	541	4135
Dolomite ()*	None	CaMg(CO₃)₂	1600	541	9895
Fersmite ()*	Columbite	CaNb₂O₆	1600	541	83
Fluorite ()*	Fluorite	CaF₂	1600	541	9617
Hematite ()*	Corundum	Fe₂O₃	1600	541	14640
Huanghoite-(Ce) ()*	None	BaCe(CO₃)₂F	1600	541	9
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	1600	541	14899
Monazite-(Ce) ()*	Monazite	Ce(PO₄)	1600	541	945
Parisite-(Ce) ()*	Parisite	CaCe₂(CO₃)₃F₂	1600	541	112
Phlogopite ()*	Mica Clay	KMg₃(AlSi₃O₁₀)(OH)₂	1600	541	2273
Riebeckite ()*	Amphibole	Na₂(Fe²⁺₃Fe³⁺₂)Si₈O₂₂(OH)₂	1600	541	375

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Jen_0001114	MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001115	MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001116	MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001117	MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001118	MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001119	MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.
Jen_0001120	MAGMATIC STYLE: Dykes and possible dolomitized carbonatite tuff. ASSOCIATED SILICATE ROCKS: There are extensive peralkaline granites but their relationship, if any, to the carbonatites is not clear. Basic dykes and brecciated peridotite also occur.

9 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Sample Source	Age from other Locality	Dated Mineral	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
Jen_0001114	2070	2070	2070	U-Pb	zircon	Yes	Zircon		720	Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China	Bayan Obo Mine	Yang and Woolley (2006)		JAES27_559
Jen_0001115	809	809	809	Sm-Nd	whole rock	Yes			720	Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China	Bayan Obo Mine	Yang and Woolley (2006)		JAES27_559
Jen_0001116	1223	1223	1223	Sm-Nd	whole rock	Yes			720	Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China	Bayan Obo Mine	Yang and Woolley (2006)		JAES27_559
Jen_0001117	1286	1286	1286	Sm-Nd	whole rock	Yes			720	Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China	Bayan Obo Mine	Yang and Woolley (2006)		JAES27_559
Jen_0001118	1313	1313	1313	Sm-Nd	whole rock	Yes			720	Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China	Bayan Obo Mine	Yang and Woolley (2006)		JAES27_559
Jen_0001119	1096	1096	1096	Sm-Nd	whole rock	Yes			720	Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China	Bayan Obo Mine	Yang and Woolley (2006)		JAES27_559
Jen_0001120	1208	1208	1208	Sm-Nd	whole rock	Yes			720	Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China	Bayan Obo Mine	Yang and Woolley (2006)		JAES27_559
TMA-00004	566	544	555±11	Th-Pb	bastnӓsite	Yes		Ce, La, Nd, Y	720	Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China	Bayan Obo REE ore deposit	Wang et al. (1994)	10.1016/0016-7037(94)90043-4	GCA58_3155	The combination of textural evidence and isotopic data from this study indicates that intermittent REE mineralization of the Bayan Obo deposit started at about 555 Ma, and the principal mineralization related to Caledonian subduction occurred between 474 and 400 Ma.; The most important results of this study indicate that (1) the large database of precise chronology, in conjunction with mineral replacement relation, provides evidence for a prolonged period of mineralization within the giant Bayan Obo orebody and (2) lead and neodymium isotopic compositions indicate that the source for the ores was depleted in uranium but enriched in thorium and LREEs.; note spelling as Bastnaesite in lit.
ree-00249	1600	541	Middle Proterozoic-- 1580 Ma						143972	Main Pit, Bayan Obo Deposit (Bayun-Obo Deposit; Baiyunebo Deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia, China	Bayan Obo (Baotou)	Orris and Grauch (2002)		USGSOFR02_189

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...