Mineral Evolution Database

Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.

Mineral locality data provided by mindat.org

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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:
Birch Creek Prospect, Malheur Co., Oregon, USA

Oldest recorded age at locality: 17.86
Youngest recorded age at locality: 15.68

mindat Locality ID: 147581
mindat URL: http://www.mindat.org/loc-147581.html

Tectonic Settings:

Total number of sublocalities beneath "Birch Creek Prospect, Malheur Co., Oregon, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 44°14'29"N
Longitude: 117°20'24"W
Decimal Degree (lat, lon): 44.241388888889,-117.34

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.

No IMA Minerals occur at this locality according to mindat

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Michelle_789	Birch Creek low-silica rhyolite lava. It is the first rhyolitic unit to erupt in the region. 150 m high exposures of flow banded, devitrified, tan lava in cliffs near Birch Creek Campground. Of the Rooster Comb Caldera.

1 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	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	Michelle_789	17.86	15.68	16.77±1.09	Ar-Ar	Age of rhyolite		plagioclase	TB-278A						147581	Birch Creek Prospect, Malheur Co., Oregon, USA	Birch Creek	Benson and Mahood (2016)	10.1016/j.jvolgeores.2015.11.011	JVGR309_96	Age of rhyolite flow. "Our new 40Ar/39Ar age of 16.8 ± 1.1 Ma on plagioclase from the Birch Creek low-silica rhyolite lava (sample TB-278A in Table 2) is of such low precision that it does not establish conclusively that this unit is older than the 15.81 Ma Tuff of Leslie Gulch."

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...