Last edited by Arale
Saturday, July 11, 2020 | History

2 edition of Geology of the igneous rocks of the Spanish Peaks region, Colorado found in the catalog.

Geology of the igneous rocks of the Spanish Peaks region, Colorado

Ross B. Johnson

Geology of the igneous rocks of the Spanish Peaks region, Colorado

by Ross B. Johnson

  • 20 Want to read
  • 13 Currently reading

Published by U.S. Govt. Print. Off. in Washington .
Written in English

    Places:
  • Colorado,
  • Spanish Peaks region.
    • Subjects:
    • Rocks, Igneous.,
    • Petrology -- Colorado -- Spanish Peaks region.,
    • Geology -- Colorado -- Spanish Peaks region.

    • Edition Notes

      Bibliography: p. 37-38.

      Statementby Ross B. Johnson.
      SeriesShorter contributions to general geology, Geological Survey professional paper 594-G, Shorter contributions to general geology., Geological Survey professional paper ;, 594-G.
      Classifications
      LC ClassificationsQE75 .P9 no. 594-G
      The Physical Object
      Paginationvi, 47 p.
      Number of Pages47
      ID Numbers
      Open LibraryOL5025224M
      LC Control Number73604919

      The Peaks are prime examples of "stocks" which are defined as large masses of igneous (molten) rock that intruded layers of sedimentary rock and were later exposed, due to erosion. Dikes Among the most unusual features of the Spanish Peaks are the great dikes that radiate out from the mountains like spokes of a wheel. Penn, B. S., and Lindsey, D. A., , Tertiary igneous rocks and Laramide structure and stratigraphy of the Spanish Peaks region, south-central Colorado: road log and descriptions from Walsenburg to La Veta (first day) and La Veta to Aguilar (second day), in Thompson, R.A., Hudson, M. R., and Pillmore, C.L., eds., Geologic excursions to the.

      This animation specifically shows the origin Spanish Peaks, southern Colorado (~ 24 to 25 million years ago). 8 to 24 seconds: The scene shows igneous magma intruding vertically through the rock, and then intruding laterally into the flat-lying rocks. The continued pooling of . Abstract. Twenty representative rocks ranging from lamprophyric to granitic composition, from the Spanish Peaks igneous Complex, south-central Colorado, were analyzed for Sr isotopic compositions and their concentrations of K, Rb, Sr and Ba.

      ref:deposit:: johnson, r.b., , geology of the igneous rocks of the spanish peaks region, colorado: usgs prof. paper deposit:: johnson, r.b., , geologic. reference: johnson, r.b., , geology of the igneous rocks of the spanish peaks region, colorado: usgs prof. paper g PAPER G Reference Category: Geology.


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Geology of the igneous rocks of the Spanish Peaks region, Colorado by Ross B. Johnson Download PDF EPUB FB2

Geology of the igneous rocks of the Spanish Peaks region, Colorado [Ross B. Johnson] on *FREE* shipping on qualifying offers. Geology of the igneous rocks of the Spanish Peaks region, Colorado. Geology of the igneous rocks of the Spanish Peaks region, Colorado. [Ross B Johnson] -- "A study of the highly diverse igneous rocks and structures of a classic geologic area, with a discussion on the emplacement of these features.".

B (bottom), DIKE OF IGNEOUS ROCK FORMING NARROW WALL, SPANISH PEAKS, COLO. The Spanish Peaks consist of large masses of igneous rocks which were intruded in molten condition into the sandstones and shales at the foot of the Rocky Mountains.

(See fig. 8, p. The east peak is 12, feet high and the west p feet. The Spanish Peaks area is composed of two prominent peaks and associated dike swarms about 19 to 22 mi (30 to 35 km) southwest of Walsenburg in south Alteration zones related to igneous activity, Spanish Peaks area, Las Animas and Huerfano counties, Colorado Robert M.

Hutchinson Department of Geology, Colorado School of Mines, Golden. two peaks are formed by igneous bodies that were intruded 26 to 22 million years ago and have since been exposed by removal of the overlying sedimentary rock layers by erosion.

Radiating from the Spanish Peaks are hundreds of dikes, nearly vertical slabs of igneous rock that. A geologic and geochemical investigation and a survey of mines and prospects have been conducted to evaluate the mineral resource potential of the Spanish Peaks Wilderness Study Area, Huerfano and Las Animas Counties, in south-central Colorado.

Thestudy area is underlain by sedimentary rocks of Paleozoic to Tertiary age (Johnson, ). The Spanish Peaks. The Spanish Peaks are geologically distinct from the faulted and uplifted mountains of the Sangre de Cristo range to the west. To the geologist, the Spanish Peaks are prime examples of stocks—large masses of igneous rock layered by sedimentary rock and exposed by erosion.

The elements have eroded away the softer overlying sedimentary rocks and exposed the underlying hard, igneous stocks of the Spanish Peaks.

While the surrounding area is marked by many lava flows and volcanic mountains (some of which have been active as recently as 10, years ago), the Spanish Peaks are not extinct volcanoes. The igneous rocks exposed at the peaks, and their accompanying dikes, were intruded in the neighborhood of Ma (Penn, ).

East and West Spanish Peaks reach elevations of 12, feet feet respectively, rising about feet above the surrounding plains. West Spanish Peak is the easternmost mountain o ft (4, m) in the United States.

The Spanish Peaks were formed by two separate shallow (or hypabyssal) igneous intrusions during the Late-Oligocene epoch of the Paleogene Period. West Spanish Peak is an older ( +/- Ma) quartz syenite. East Spanish Peak ( +/- Ma) is composed of a granodiorite porphyry.

The Spanish Peaks are geologically distinct from the faulted and uplifted mountains of the Sangre de Cristo range to the west. To the geologist, the Spanish Peaks are prime examples of stocks—large masses of igneous rock layered by sedimentary rock and exposed by erosion.

Stocks 27 million years ago, pressures and stresses built up by [ ]. Smith, R. (), Compositional evolution and tectonic relations of Spanish Peaks igneous rocks, south-central Colorado, Geol. Soc America, Abs. with Programs (Rocky Mountain Sec) 8. I G Geology of the igneous rocks of the Spanish peaks region colorado I H Diagenesis in ooltic limestone of morrow (early Pennsylvanian) age in northwestern Arkansas and adjacent Oklahoma I I Critical review of the san juan peneplian southwestern colorado I J Geology of the mockingbird gap.

PP G / Johnson, R. / GEOLOGY OF THE IGNEOUS ROCKS OF THE SPANISH PEAKS REGION, COLORADO,pb, 1 plate (in pocket), 9 figs., 21 tables, $ 12 PP I / Steven, T. / CRITICAL REVIEW OF THE SAN JUAN PENEPLAIN, SOUTHWESTERN COLORADO,pb, 19 pages, 1 plate (in pocket), $ 6. Photographs and information for a large collection of igneous, metamorphic and sedimentary rocks.

Major Element Data for Samples from the Spanish Peaks Region. KEY to sample names. Major and minor element concentrations were determined using energy-dispersive x-ray fluorescence spectrometry (EDXRF) by David Simms and Joe Curry at the U.S.G.S. in Lakewood, Colorado using the methods outlined by Johnson and King ().

Field trip no. 28 from “Geologic Excursions to the Rocky Mountains and Beyond,” field trip guidebook of the Annual Meeting of the Geological Society of America. Tertiary Igneous Rocks and Laramide Structure and Stratigraphy of the Spanish Peaks Region, South-Central Colorado: Road Log and Descriptions from Walsenburg to La Veta (Day 1) and and [ ].

The Spanish Peaks, on the eastern flank of the Sangre de Cristo range, abruptly rise 7, feet above the western Great Plains. Settlers, treasure hunters. Penn and Lindsey, Tertiary Igneous Rocks and Laramide Structure and Stratigraphy of the Spanish Peaks Region, South-Central Colorado.

Penn and Lindsey. The Cuchara Formation (Sandstone) We would be remiss not to mention the rock that was intruded by. The petrogenesis of the igneous complex in the Spanish Peaks region, Colorado, is reevaluated with Sr isotopic data (published and new) and new trace element data of REE and other transition metals.

These data indicate that the diverse rock types ranging from ultrabasic lamprophyres to granitic porphyry of the igneous complex have independent. The geology of the Spanish Peaks region and the petrology of its igneous rocks have been described by E~DLICI4 (), HILLS (), KNOVF (), and JOHNSON (,).Igneous rocks form through the cooling and solidification of magma or lava, and may form with or without rock is referred to as “intrusive” or “plutonic” if the magma solidifies underground, and it is referred to as “extrusive” or “volcanic” if the lava solidifies on the Earth’s surface (Colorado Geological Survey [CGS], n.d.a).To the geologist the Spanish Peaks are prime examples of " stocks " which are defined as large masses of igneous (molten) rock which intruded layers of sedimentary rock and were later exposed by erosion.

When mapped by geologists the Peaks were found to be .