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The Ajo mining district, Arizona / by James Gilluly.
- Format:
- Book
- Government document
- Author/Creator:
- Gilluly, James, 1896-1980, author.
- Series:
- Professional paper (Geological Survey (U.S.)) ; no. 209.
- Professional paper ; 209
- Language:
- English
- Subjects (All):
- Geology--Arizona--Pima County.
- Geology.
- Mines and mineral resources--Arizona--Pima County.
- Mines and mineral resources.
- Arizona--Pima County.
- Genre:
- Online resources.
- Physical Description:
- 1 online resource (vii, 112 pages) : plates, maps
- Distribution:
- Washington : United States Government Printing Office
- Place of Publication:
- Washington : United States Department of the Interior, Geological Survey, 1946.
- 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
- Origin
- Hornfels in Chico Shunie monzonite derived from supracrustal rocks
- Chico Shunie quartz monzonite
- Relation to other formations
- Andesite dikes in pre-Concentrator rocks
- Correlation
- Concentrator volcanics
- Stratigraphic relations
- Andesite
- Keratophyre
- Quartz keratophyre
- Quartz keratophre tuffs
- Origin and alteration
- Cornelia quartz monzonite
- Contact relations
- Facies
- Border facies (quartz diorite)
- Occurrence
- Equigranular facies
- Porphyritic facies
- Alteration
- Chemical composition
- Emplacement
- Age
- Feldspathic andesite porphyry
- Nonporphyritic andesite dikes older than Locomotive fanglomerate
- Structural and genetic relations
- Locamotive fanglomerate
- Stratigraphy
- Thickness
- Ajo volcanics
- Topographic expression
- Nonporphyritic andesite dikes younger than Locomotive fanglomerate
- Origin, age, and correlation
- Sneed andesite
- Correlation and source
- Daniels conglomerate
- Hospital porphyry
- Relations
- Childs latite
- Batamote andesite
- Breccias of Batamote andesite and associated basaltic dikes
- Batamote plug
- Childs Mountain plugs
- Alluvium
- Structure
- Structural features older than the Concentrator volcanics
- Structure of the Concentrator volcanics
- Gibson fault
- Location and relations
- Faults of northeast trend near the Ajo Peaks
- Little Ajo Mountain fault
- Location and structural effects
- 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
- Mountains
- Pediments
- 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
- 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.
- Notes:
- Electronic reproduction. [Place of publication not identified] : HathiTrust Digital Library, 2010.
- Online resource; title from PDF title page (USGS viewed Apr. 25, 2017).
- Includes bibliographical references and index.
- Other Format:
- Print version: Gilluly, James, 1896-1980. Ajo mining district, Arizona.
- OCLC:
- 567990185
- Access Restriction:
- Use copy Restrictions unspecified
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