Geology of TexasPP - The Geology of Texas What can we...

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The Geology of Texas
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What can we learn? Local examples to illustrate the theory of plate tectonics Geologic history of Texas Texas’ geologic resources Petroleum Coal Minerals Groundwater Fertile soils
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The Geologic Map of Texas Ages of rock units indicated by color Paleozoic rocks (blue) younger from E to W Rocks of coastal plain younger from W to E Balcones Fault Zone: boundary Cretaceous rocks (green) directly overlie older rocks (Precambrian,Paleozoic and Triassic)
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A Short Tour through a Billion Years of Geologic Time in Texas
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W i c a n d e r   M o ( 1 9 ) Rocks found in Texas represent over 1.2 billion  years of Earth’s history.
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Precambrian Texas The Proterozoic Metamorphic and igneous rocks were accreted to Laurentia ( Grenville orogeny ) See it here: Llano Uplift, Van Horn, Franklin Mountains
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The Grenville Orogeny
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Example: Packsaddle Schist Formed from sediments derived from weathering and erosion of mafic igneous rocks (associated with an island arc) Metamorphism: 1.3 billion years ago
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Example: Packsaddle Schist
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Examples: Llanite and Town Mountain Granite Igneous intrusions into metamorphic rocks at 1.1 b.y. Dikes, veins, laccoliths (e.g. Enchanted Rock)
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1.08 b.y. old Dike - Llanite
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1.05-1.06 b.y. old Town Mountain Granite (Enchanted Rock)
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Texas Town Mountain Granite Has Been Quarried for Building  Stone Since the Early 1900s
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Texas Town Mountain Granite Was Quarried for Building the Texas State Capitol Building in Austin
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Review Proterozoic: Some of the oldest rocks  in Texas crop out in the  Llano Uplift of Central  Texas These rocks represent  time from about 1250 Ma  to 1050 Ma
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The Lower Paleozoic All of Texas covered by an epeiric sea during a transgression Cambrian: beach and near-shore sandstones, some beds dominated by glauconite Ordovician: thick sequences of dolomites contain large reserves of oil and natural gas
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Global Paleogeography During  Cambrian Time
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Geology of TexasPP - The Geology of Texas What can we...

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