Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org

Ages for Magnesiochromite at Yukon-Koyukuk Census Area, Alaska, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of Ma - Ma at this locality

Mineralization age

Excel ID	Max Age (Ma)	Min Age (Ma)	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	Dated Locality ID	Dated Locality	Ref	Ref ID
podchrome-00929	170	170			Cr	201964	Unnamed Occurrences (ARDF - BT011; Near Caribou Mountain), Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USA	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00939	170	170			Cr	201406	Unnamed Occurrence (ARDF - NL003; Northwest Of Hill 1325), Kaiyuh District, Yukon-Koyukuk Census Area, Alaska, USA	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00940	170	170			Cr	201408	Unnamed Occurrence (ARDF - NL005; Southwest Of Hill 2120), Kaiyuh District, Yukon-Koyukuk Census Area, Alaska, USA	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00941	170	170			Cr	201407	Unnamed Occurrence (ARDF - NL004; Northwest Of Hill 2120), Kaiyuh District, Yukon-Koyukuk Census Area, Alaska, USA	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00942	170	170			Cr	201409	Unnamed Occurrence (ARDF - NL006; East Of Hill 2120), Kaiyuh District, Yukon-Koyukuk Census Area, Alaska, USA	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00943	170	170			Cr	199014	Mount Hurst Occurrence, Ophir District, Yukon-Koyukuk Census Area, Alaska, USA	Moiser et al. (2012)	USGSSIR2012_5157

Locality age

Excel ID	Max Age (Ma)	Min Age (Ma)	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	Dated Locality ID	Dated Locality	Ref	Ref ID
PorphCu-00242	75	5		Actinolite, Calcite, Chalcocite, Chalcopyrite, Epidote, Galena, Montmorillonite, Pyrite, Sphalerite	Cu	199759	Round Top Prospect (incl. Tim's Greisen Prospect), Kaiyuh District, Yukon-Koyukuk Census Area, Alaska, USA	Singer et al. (2008)	USGSOFR2008_1155
PorphCu-00244	390	390		Bornite, Chalcopyrite, Magnetite, Pyrite	Cu	202772	Venus Prospect, Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USA	Singer et al. (2008)	USGSOFR2008_1155
ree-00672	90.3	83.1				199761	Roy Creek; Little Champion Creek Prospect, Circle District, Yukon-Koyukuk Census Area, Alaska, USA	Orris and Grauch (2002)	USGSOFR02_189
ree-00806	91.8	79				199761	Roy Creek; Little Champion Creek Prospect, Circle District, Yukon-Koyukuk Census Area, Alaska, USA	Orris and Grauch (2002)	USGSOFR02_189
sedexmvt-00234	419	393				199655	Reef Ridge Prospect, McGrath District, Yukon-Koyukuk Census Area, Alaska, USA	Taylor et al. (2009)	USGSOFR2009_1297
USGS-U-Th-Pb-01528_206_238	277	277	Zircon			201954	Unnamed Occurrence (ARDF - WI139; West Of Upper Jones Creek), Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-01528_207_206	353	353	Zircon			201954	Unnamed Occurrence (ARDF - WI139; West Of Upper Jones Creek), Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-01528_207_235	285	285	Zircon			201954	Unnamed Occurrence (ARDF - WI139; West Of Upper Jones Creek), Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-01529_206_238	276	276	Zircon			201954	Unnamed Occurrence (ARDF - WI139; West Of Upper Jones Creek), Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-01529_207_206	367	367	Zircon			201954	Unnamed Occurrence (ARDF - WI139; West Of Upper Jones Creek), Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-01529_207_235	285	285	Zircon			201954	Unnamed Occurrence (ARDF - WI139; West Of Upper Jones Creek), Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-01530_206_238	268	268	Zircon			201954	Unnamed Occurrence (ARDF - WI139; West Of Upper Jones Creek), Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-01530_207_206	378	378	Zircon			201954	Unnamed Occurrence (ARDF - WI139; West Of Upper Jones Creek), Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-01530_207_235	279	279	Zircon			201954	Unnamed Occurrence (ARDF - WI139; West Of Upper Jones Creek), Koyukuk District, Yukon-Koyukuk Census Area, Alaska, USA	USGS-U-Th-Pb	USGS-U-Th-Pb