The Ajo mining district, Arizona / by James Gilluly.
| Author/creator | Gilluly, James |
| Other author | United States. Department of the Interior. |
| Other author | Geological Survey (U.S.) |
| Format | Book |
| Publication Info | Washington : U.S. Govt. Print. Off., 1946. |
| Description | vii, [17], 112 pages : plates, maps, diagrams ; 29 cm. |
| Subjects |
| Variant title | Title of plate 3: Geologic map and sections of the Ajo quadrangle, Pima County, Arizona |
| Series | Professional paper ; 209 Professional paper (Geological Survey (U.S.)) no. 209. ^A414271 |
| Contents | Preface / G.F. Loughlin -- Abstract -- Introduction -- Location, culture, and accessibility -- Physical features -- Climate and vegetation -- Previous work -- Field work and acknowledgments -- Descriptive geology -- General features -- Cardigan gneiss -- Distribution and topographic expression -- Relations to other formations -- Petrography -- Medium-grained, irregularly banded gneiss -- Finer-grained gneiss -- Augen gneiss -- Schist -- Quartz-diorite gneiss -- Minor varieties -- Composition -- Origin and history -- Age and correlation -- Hornblendite -- Distribution -- Structural relations -- Petrography -- Origin -- Age and correlation -- Hornfels in Chico Shunie monzonite derived from supracrustal rocks -- Distribution -- Petrography -- Age and correlation -- Chico Shunie quartz monzonite -- Distribution and topographic expression -- Relation to other formations -- Petrography -- Origin and history -- Age and correlation -- Andesite dikes in pre-Concentrator rocks -- Distribution -- Structural relations -- Petrography -- Correlation -- Concentrator volcanics -- Distribution and topographic expression -- Stratigraphic relations -- Petrography -- Andesite -- Keratophyre -- Quartz keratophyre -- Quartz keratophre tuffs -- Origin and alteration -- Age and correlation -- Cornelia quartz monzonite -- Distribution and topographic expression -- Contact relations -- Facies -- Border facies (quartz diorite) -- Occurrence -- Petrography -- Equigranular facies -- Distribution -- Petrography -- Porphyritic facies -- Distribution -- Petrography -- Alteration -- Chemical composition -- Emplacement -- Age -- Feldspathic andesite porphyry -- Occurrence -- Structural relations -- Petrography -- Origin -- Nonporphyritic andesite dikes older than Locomotive fanglomerate -- Distribution -- Petrography -- Structural and genetic relations -- Locamotive fanglomerate -- Distribution and topographic expression -- Stratigraphy -- Thickness -- Origin -- Age and correlation -- Ajo volcanics -- Distribution -- Topographic expression -- Stratigraphy -- Thickness -- Petrography -- Origin -- Age -- Nonporphyritic andesite dikes younger than Locomotive fanglomerate -- Distribution -- Petrography -- Origin, age, and correlation -- Sneed andesite -- Distribution -- Stratigraphic relations -- Thickness -- Petrography -- Correlation and source -- Daniels conglomerate -- Distribution and topographic expression -- Stratigraphy -- Thickness -- Origin -- Age and correlation -- Hospital porphyry -- Distribution -- Petrography -- Relations -- Childs latite -- Distribution -- Petrography -- Chemical composition -- Origin -- Batamote andesite -- Distribution and topographic expression -- Stratigraphy -- Petrography -- Chemical composition -- Breccias of Batamote andesite and associated basaltic dikes -- Occurrence -- Batamote plug -- Childs Mountain plugs -- Age and correlation -- Alluvium -- Distribution -- Stratigraphy -- Age -- Structure -- General features -- Structural features older than the Concentrator volcanics -- Structure of the Concentrator volcanics -- Gibson fault -- Location and relations -- Age -- Faults of northeast trend near the Ajo Peaks -- Little Ajo Mountain fault -- Location and structural effects -- Age -- Minor faults possibly cognate with the Little Ajo Mountain fault -- Chico Shunie-Black Mountain fault group -- Childs Mountain fault -- Fault bounding Back Mountain on the southwest -- Other faults in the northern part of the quadrangle -- Postulated faults near Daniels Arroyo -- Folds -- Summary of deformation -- Origin of the faults -- Physiography -- General features -- Mountains -- Pediments -- Distribution -- Surfaces of the pediments -- Shape in plan -- Shape in profile -- Shape in cross section -- Bajadas -- Drainage -- Origin of the pediments -- Geologic history -- Rock alteration -- Processes -- Metamorphism older than the ore deposition -- Metamorphism older than the Chico Shunie quartz monzonite -- Early dynamic metamorphism of the Cardigan gneiss -- Injection metamorphism of the Cardigan gneiss -- Dynamic metamorphism of the injection gneiss -- Metamorphism accompanying the Chico Shunie volcanics -- Pre-Cornelia metamorphism of the Concentrator volcanics -- Metamorphism and ore deposition associated with the Cornelia quartz monzonite -- Normal contact metamorphism -- Additive metamorphism, including ore deposition -- Late magmatic modifications of the Cornelia quartz monzonite -- Postmagmatic modifications in and near the New Cornelia ore body -- Mineral distribution -- Source and character of the metamorphosing solutions -- Chemical changes associated with the ore deposition -- Albitization of the Cornelia quartz monzonite not associated with the New Cornelia ore body -- Metamorphism younger than the ore deposition -- Post-Cornelia dynamic metamorphism -- Hydrothermal metamorphism -- Weathering -- Pre-Locomotive weathering of the ore body -- Recent weathering of the ore body -- Causes of contrasted weathering in pre-Locomotive and Recent time -- Mineralogy -- Minerals found in the Ajo mining district -- Features of occurrence -- Mining history -- Production -- Ore deposits -- New Cornelia mine -- Location and topography -- Drainage and water problems -- Geology -- Ore bodies -- General features -- Size and shape -- Reserves -- Relation of the ore bodies to rock formations -- Relation of the ore bodies to the present surface and to the pre-fanglomerate surface -- Relation of the ore bodies to minor structural features -- Economic possibilities of the area -- Index. |
| Local note | Joyner-FOR JOYNER LIBRARY HOLDINGS OF THE SERIES, GEOLOGICAL SURVEY PROFESSIONAL PAPER, SEARCH BY CALL NUMBER QE75 .P9. |
| General note | 9 maps, 5 charts in pocket. |
| Bibliography note | Includes bibliographical references and index. |
| Issued in other form | Online version: Gilluly, James, 1896- Ajo mining district, Arizona. Washington : U.S. Govt. Print. Off., 1946 |
| LCCN | gs 47000061 |
| GPO item number | 0624 |
| Govt. docs number | I 19.16:209 |