Table of Contents - SPE250: Geology of the Solitario, Trans-Pecos Texas

Acknowledgments

Abstract

Introduction

General Information
Climate and Vegetation Climate
Vegetation Previous Work

Physiography and Geomorphology

Fresno Canyon
Rim Escarpment
Central Basin
Soils
Surface and Ground Water
Surface water
Water wells
Regional drainage
Interior drainage of the Solitario dome Recent Slumping

Stratigraphy

General Outline
Basement Rocks
Paleozoic Rocks
Cambrian System Dagger Flat Sandstone Ordovician System
Marathan Formation
Fort Peņa Formation
Woods Hollow Shale
Maravillas Formation Devonian-Mississippian Systems Caballos Novaculite Mississippian-Pennsylvanian Systems Tesnus Formation Permian System
Paleozoic metamorphism Mesozoic Rocks
Trinity Group
Yucca Formation
Glen Rose Formation Fredericksburg Group
Telephone Canyon Formation
Del Carmen Limestone Washita Group
Sue Peaks Formation
Santa Elena Limestone
Del Rio Clay
Buda Limestone Eagle Ford Group
Boquillas Formation Cretaceous-Tertiary Boundary
Tertiary Rocks
Buck Hill Group
Devil's Graveyard Formation
Chisos Formation
Mitchell Mesa Tuff
Fresno Formation
Santana Tuff
Rawls Formation Solitario igneous suite
Rim sill rhyolite
Syenite-monzonite porphyry
Rhyolite
Ryolite breccia
Granite porphyry
Needle Peak Tuff (new)
Latite
Syenite porphyry
Rhyolite vent breccia
Trachyte
Soda trachyte
Volcanic breccia dikes
Olivine syenite
Trachyandesite Quaternary Sediments

Geochemistry and Geochronology of the Tertiary Igneous Rocks

Geochemistry
Geochronology Laboratory methods
Age of the dome
Solitario igneous suite
Buck Hill Group
Regional chronology

Economic Geology

Introduction
Description of Existing Prospects Prospect E-1-Molybdenum
Prospect E-2-Cinnabar
Prospect E-3-Gold, silver, lead, and zinc Development and production
Geology Prospect E-4-Lead, zinc, and manganese
Prospects E-5, 6, 7-Manganese
Prospect E-8-Uranium
Prospect E-9-Fluorspar
Prospect E-10-Limonite occurrence

Geophysical Surveys

Gravity Surveys
Regional gravity surveys
Gravity surveys of the Solitario and vicinity Magnetic Surveys Regional aeromagnetic map
Intermediate-scale aeromagnetic survey
Low-level aeromagnetic survey
Ground magnetic surveys Other Geophysical Surveys
Heat flow

Structural Geology

Regional Setting
Orogenies
Llanorian
Ouachita
Tres Papalotes folded area
Tesnus monocline
Righthand Shutup folded area
Solitario thrust fault
Northern folded area Laramide Origin of the Solitario Dome
Hypothesis one-Stock
Hypothesis two-Impact structure
Hypothesis three-Salt dome
Hypothesis four-Collapse caldera
Hypothesis five-Laccolith
Lonsdale's model
Our interpretation Structural Analysis of the Solitario Dome
Emplacement level
Original depth of intrusion
Structural relief of the Solitario dome and volume of the intrusion
Formation of the crestal graben and subsequent collapse of the central block
Extension
Terlingua Anticline
Origin and age of the anticline

Summary and Conclusions

Predome History
Formation of the Dome
Postdome History

Appendices

A. Maps and aerial photography available for the Solitario area, Trans-Pecos Texas
B. Measured stratigraphic section in the Solitario
C. Ordovician fossil localities in the Solitario
D. Graptolites from Marathon Formation in the Solitario
E. Cretaceous fossils collected in the Solitario and surrounding areas
F. Sample locations and descriptions for rocks from the Solitario igneous suite
G. Partial chemical analyses and minor and trace elements of igneous rocks from the Solitario
H.Gravity and magnetic data acquisition and reduction

References Cited

Plates (in pocket)

I. Geologic Map of the Solitario 71/2' Quadrangle
II. Complete Bouguer Anomaly Map of the Solitario and vicinity, Texas
III. High-level Aeromagnetic Map of the Solitario and vicinity, Trans-Pecos Texas
IV. Low-level Aeromagnetic Map of the Solitario, Trans-Pecos Texas