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Cienega Gap area, Pima County, Arizona, USAi
Regional Level Types
Cienega Gap areaArea
Pima CountyCounty
ArizonaState
USACountry

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PhotosMapsSearch
06042300017272074451268.jpg
"Turkey Track" porphyry exposed along I-10

Cienega Gap area, Pima County, Arizona, USA
00049350017272074461452.jpg
"Turkey Track" porphyry outcrop close-up

Cienega Gap area, Pima County, Arizona, USA
05116080017272074467011.jpg
Labradorite, etc.

Cienega Gap area, Pima County, Arizona, USA
06042300017272074451268.jpg
"Turkey Track" porphyry exposed along I-10

Cienega Gap area, Pima County, Arizona, USA
00049350017272074461452.jpg
"Turkey Track" porphyry outcrop close-up

Cienega Gap area, Pima County, Arizona, USA
05116080017272074467011.jpg
Labradorite, etc.

Cienega Gap area, Pima County, Arizona, USA
06042300017272074451268.jpg
"Turkey Track" porphyry exposed along I-10

Cienega Gap area, Pima County, Arizona, USA
00049350017272074461452.jpg
"Turkey Track" porphyry outcrop close-up

Cienega Gap area, Pima County, Arizona, USA
Latitude & Longitude:
32° North , 111° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~153km
GRN:
N22W68
Type:
Area
Mindat Locality ID:
46157
Long-form identifier:
mindat:1:2:46157:8
GUID (UUID V4):
0


A road cut along the eastbound lanes of I-10, four miles east of interchange for southbound Arizona Hwy 83 (at mile 281), exposes the “Turkey Track” porphyry (mileages used here due to standards for highway systems in USA). The porphyry is gray to brown and andesitic, and is interbedded with light-colored alluvial and lacustrine strata of the Pantano formation. Sedimentary strata below the flow are baked, but beds resting atop the flow are unaltered, indicating the porphyry here represents a flow rather than an intrusive, and the top of the flow may represent an erosion surface. Data from nearby localities suggest an age between 36 and 28 million years for the flow.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


2 valid minerals.

Detailed Mineral List:

ⓘ Anorthite
Formula: Ca(Al2Si2O8)
Description: As phenocrysts up to 2 inches long on intrusive & flow porphyritic rocks in the Pantano Formation.
ⓘ Anorthite var. Labradorite
Formula: (Ca,Na)[Al(Al,Si)Si2O8]
Description: As phenocrysts up to 2 inches long on intrusive & flow porphyritic rocks in the Pantano Formation.
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ 'Mica Group'
ⓘ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
Group 9 - Silicates
ⓘAnorthite9.FA.35Ca(Al2Si2O8)
ⓘvar. Labradorite9.FA.35(Ca,Na)[Al(Al,Si)Si2O8]
Unclassified
ⓘ'Mica Group'-
ⓘ'Serpentine Subgroup'-D3[Si2O5](OH)4

List of minerals for each chemical element

HHydrogen
Hⓘ Serpentine SubgroupD3[Si2O5](OH)4
OOxygen
Oⓘ AnorthiteCa(Al2Si2O8)
Oⓘ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ Serpentine SubgroupD3[Si2O5](OH)4
NaSodium
Naⓘ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
AlAluminium
Alⓘ AnorthiteCa(Al2Si2O8)
Alⓘ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
SiSilicon
Siⓘ AnorthiteCa(Al2Si2O8)
Siⓘ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
Siⓘ Serpentine SubgroupD3[Si2O5](OH)4
CaCalcium
Caⓘ AnorthiteCa(Al2Si2O8)
Caⓘ Anorthite var. Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
FeIron
Feⓘ MagnetiteFe2+Fe23+O4

Other Regions, Features and Areas containing this locality

Mexico
North AmericaContinent
North America PlateTectonic Plate
USA

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

‡Ref.: Cooper, J.R. (1961), Turkey-track porphyry - A possible guide for correlation of Miocene rocks in southeastern Arizona, Arizona Geological Society Digest: 4: 17-35.
Mielke, J.E. (1965), Trace element investigation of the “Turkey Track” porphyry, southeastern Arizona: MS thesis, Univ. Arizona.
Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.). University of Arizona Press.pp.329-330
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