Precambrian_lecture - 4567.11 0.15 million years ( 0.003%!)...

Info iconThis preview shows pages 1–25. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Previously accumulated daughter argon is driven out of very hot basaltic lava during eruption.
Background image of page 4
Basalt lava quickly cools and crystallizes, after which radiogenic Ar begins to accumulate once again.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Magma comprising a batholith cools very slowly.
Background image of page 6
Geologic map of Texas. The black area at the center is the Llano Uplift.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
In this geologic map of the Llano Uplift, yellow, green, and blue refer to types of metamorphic rock. Red refers to granite batholiths. White (uncolored) refers to sedimentary rock.
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 10
Geologic Time Scale. Each column to the right is an expansion of the upper portion of the column to its left.
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 12
First, we consider the age of the solar system (including the Earth).
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Material condensing in the early disk phase of the solar system
Background image of page 14
0.5 cm Slab of Allende stony meteorite Earliest material to condense:
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 16
Background image of page 17

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 18
Background image of page 19

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 20
Background image of page 21

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 22
Background image of page 23

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 24
Background image of page 25
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 4567.11 0.15 million years ( 0.003%!) 0.5 mm Sedimentary strata The Grand Canyon of the Colorado River Precambrian igneous and metamorphic basement Unconformity Unconformity Slightly metamorphosed strata below an unconformity in Colorado were deformed so that they stand vertically today. Northern Canada is deeply eroded to a level plain just above sea level. Before erosion, northern Canada (preceding image) may have looked like the Austrian Alps shown here. On the ground, a Precambrian shield is seen to have low elevation and low topographic relief (Ontario, Canada). Precambrian shields worldwide. Every continent has at least one shield. A gold mine in Brazil. Precambrian shields are rich in ore deposits (the mining industry, not oil and gas)....
View Full Document

This note was uploaded on 09/14/2009 for the course GEO 401 taught by Professor Lassiter during the Spring '08 term at University of Texas at Austin.

Page1 / 25

Precambrian_lecture - 4567.11 0.15 million years ( 0.003%!)...

This preview shows document pages 1 - 25. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online