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Robinson Gulch pegmatite, Clear Creek pegmatite Province, Jefferson Co., Colorado, USA

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Latitude & Longitude (WGS84): 39° 47' 19'' North , 105° 20' 53'' West
Latitude & Longitude (decimal): 39.78861,-105.34806
KΓΆppen climate type:Dfb : Warm-summer humid continental climate


In sec. 16, T. 3 S., R. 71 W. Follow the Golden Gate Canyon Road from Golden 11 mi to Guy Gulch on the west side of Guy Hill. Turn south on the Robinson Gulch Road; the pegmatite is exposed at the edge of the road just south of a bridge over Guy Gulch. (Cobban, R., Collins, D., Foord, E., Kile, D., Modreski, P., and Murphy, J., 1997, "Minerals of Colorado, updated & revised", p. 19.)


Mineral List

Mineral list contains entries from the region specified including sub-localities

9 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Paleoproterozoic
1600 - 2500 Ma



ID: 2443086
Amphibolite, hornblendite, and related rocks

Age: Proterozoic (1600 - 2500 Ma)

Description: Dark-colored rocks composed mainly of hornblende, quartz, plagioclase, biotite, and clinopyroxene in varying amounts. Commonly consists of interlayered hornblende gneiss, amphibolite, and other gneisses, including calc-silicate gneiss. Amounts of amphibolite and hornblende in unit not uniform but always sufficient to give an unusually dark appearance.

Reference: Trimble, D.E., M.N. Machette. Geologic Map of the Greater Denver Area, Front Range Urban Corridor, Colorado. U.S. Geological Survey Geologic Investigations Series I-856-H. [64]

Paleoproterozoic
1600 - 2500 Ma



ID: 2832435
Biotitic gneiss, schist, and migmatite

Age: Proterozoic (1600 - 2500 Ma)

Description: Locally contains minor hornblende gneiss, calc-silicate rock, quartzite, and marble. Derived principally from sedimentary rocks

Lithology: Major:{biotite gneiss,schist,migmatite}, Minor:{gneiss,calc silicate schist,marble}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Paleoproterozoic
1600 - 2500 Ma



ID: 3186950
Paleoproterozoic crystalline metamorphic rocks

Age: Proterozoic (1600 - 2500 Ma)

Lithology: Orthogneiss/paragneiss

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Paleoproterozoic
1600 - 2500 Ma



ID: 2206721
Porphyroblastic quartz-biotite-muscovite schist of White Ranch

Age: Proterozoic (1600 - 2500 Ma)

Description: Silvery gray schist layers composed mostly of fine- to medium-grained, foliated, locally porphyroblastic schist composed principally of quartz, biotite, and muscovite, with small amounts of sillimanite and staurolite (Wells, 1967). Porphyroblasts include andalusite, cordierite, and garnet; some andalusite crystals in central Ralston Buttes 7.5-minute quadrangle are as long as 30 cm (Sheridan and others, 1967). Where rock is relatively unstrained, original sedimentary structures (graded bedding and cross bedding) are visible. Locally contains lenses of meta-conglomerate and calc-silicate rock (Sheridan and others, 1967). U-Pb zircon ages from clasts in metaconglomerate are β‰ˆ1,750 Ma, which is maximum depositional age of sediments in basin that includes rocks of this unit

Reference: Kellogg, K.S., Shroba, R.R., Bryant, Bruce, and Premo, W.R. Geologic Map of the Denver West 30' x 60' Quadrangle, North- Central Colorado. USGS Geologic Investigations Series 3000. [35]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


Localities in this Region

USA
  • Colorado
    • Jefferson Co.
      • Clear Creek pegmatite Province

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.
 
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