Geology and pegmatites of the Fourmile quadrangle, Black Hills, South Dakota /
| Main Author: | |
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| Corporate Author: | |
| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington :
U.S. Govt. Print. Off,
1963.
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| Series: | Pegmatites and other Precambrian rocks in the southern Black Hills.
Geological Survey professional paper ; 297-D. |
| Subjects: |
Table of Contents:
- Abstract
- Introduction
- Previous work
- Fieldwork and acknowledgments
- Regional geologic setting
- Precambrian rocks
- Metamorphic rocks
- Bugtown formation
- Schist
- Cal-silicate rock
- Altered rock types
- Origin
- Crow formation
- Amphibole schist
- Calcite-hornblende gneiss
- Calc-silicate gneiss
- Cordierite-biotite and microcline-biotite schists
- Quartzite
- Other rocks
- Origin
- Mayo formation
- Quartz-mica-feldspar schist
- Quartz-mica schist
- Metagrit and metaconglomerate
- Calc-silicate gneiss
- Cummingtonite-quartz schist
- Amphibolite
- Quartz-rich veins
- Quartz-feldspar veins
- Quartz-sillimanite veins
- Quartz-staurolite veins
- Age and origin of the veins
- Pegmatite
- Distribution
- Size, shape, and attitude
- Internal structures
- Zones
- Border zones
- Wall zones
- Intermediate zones
- Cores
- Fracture fillings
- Replacement bodies
- Layers
- Size, shape, and distribution
- Petrography
- Structure
- Sequence of crystallization of the layers
- Types of pegmatite bodies
- Layered pegmatites
- Homogeneous pegmatites
- Zoned pegmatites
- Mineralogy
- Plagioclase
- Quartz
- Perthite and microcline
- Muscovite
- Other minerals
- Paleozoic and younger rocks
- Deadwood formation
- Englewood limestone
- Pahasapa limestone
- Minnelusa sandstone
- White River group
- Quaternary sediments
- Structural geology
- Precambrian rocks
- Folds
- Foliation
- Pseudobedding
- Axial-plane and bedding-plane schistosities
- Late schistosity
- Induced foliation around pegmatites
- Lineation
- Faults, joints, and breccia zones
- Paleozoic and younger rocks
- Metamorphism
- Regional metamorphism
- Staurolite zone
- Sillimanite zone
- Contact metamorphism
- Tectonic history
- Origin of the pegmatite and the pegmatite bodies
- Evidence for intrusion
- Temperatures of formation
- Significance of composition
- Origin of zoned and layered bodies
- Significance of regional distrubution of types of pegmatites and of pegmatite minerals
- Economic geology
- Pegmatite deposits
- Mica
- Feldspar
- Beryl
- Lithium mineral
- Other minerals
- Guides for exploration of pegmatite deposits
- Gold deposits
- Pegmatite mines and prospects
- Big Tom mine (pegmatite 64)
- Corky mine (pegmatite 58)
- Gayle (Dubuque) and Royal Flush claims (pegmatite 33)
- Lincoln No. 7 claim (pegmatite 81)
- Lithia Lode claim (pegmatite 9)
- Red Spar mine (pegmatite 70)
- Rock Ridge mine (pegmatite 113)
- Warren Draw mine (pegmatite 12)
- Geology
- Quartz-plagioclase-muscovite pegmatite (border zone)
- Quartz-plagioclase-muscovite and plagioclase-quartz-muscovite pegmatite (wall zone)
- Perthite - quartz - plagioclase pegmatite (core)
- Quartz-spodumene-amblygonite-muscovite fracture fillings
- Mineral deposits
- Feldspar
- Mica
- Beryl
- Pegmatites 10 and 11 (Warren Draw claim)
- Wright Mica Lode (pegmatite 22)
- Volcano mine (pegmatite 53)
- Selected references
- Index.