2. Relative dating As we did in Lecture 7, work out the sequence of events that occurred to create the geological cross- section below. (A "sill" is a horizontal intrusive igneous feature which forms between horizontal sedimentary rocks. A "granite pluton" is a large area of intrusive igneous rock within the crust. A "dike" is a vertical intrusive igneous feature.) 3 5 Sill Shale Sandstone Limestone Land surface 6 5 6 Sandstone 5 3. Granite pluton Fault Basalt dike 1. Sedimentary rock units 1-7 are deposited in horizontal layers 2. Igneous sill intrudes between rock units 4 and 5. 3. 4. 5. 6. 7. 3. Absolute dating A rock is collected from the granite pluton for absolute dating. It contains 40K which has a half-life of 1.25 x 10 years. If 25% of the original 40K remains today, how old is the rock in billions of years?

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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2. Relative dating
As we did in Lecture 7, work out the sequence of events that occurred to create the geological cross-
section below.
(A "sill" is a horizontal intrusive igneous feature which forms between horizontal sedimentary rocks. A
"granite pluton" is a large area of intrusive igneous rock within the crust. A "dike" is a vertical intrusive
igneous feature.)
3
5
Sill
Shale
Sandstone
Limestone
Land surface
6
5
6
Sandstone
5
3.
Granite
pluton
Fault Basalt dike
1. Sedimentary rock units 1-7 are deposited in horizontal layers
2.
Igneous sill intrudes between rock units 4 and 5.
3.
4.
5.
6.
7.
3. Absolute dating
A rock is collected from the granite pluton for absolute dating. It contains 40K which has a half-life of 1.25
x 10 years. If 25% of the original 40K remains today, how old is the rock in billions of years?
Transcribed Image Text:2. Relative dating As we did in Lecture 7, work out the sequence of events that occurred to create the geological cross- section below. (A "sill" is a horizontal intrusive igneous feature which forms between horizontal sedimentary rocks. A "granite pluton" is a large area of intrusive igneous rock within the crust. A "dike" is a vertical intrusive igneous feature.) 3 5 Sill Shale Sandstone Limestone Land surface 6 5 6 Sandstone 5 3. Granite pluton Fault Basalt dike 1. Sedimentary rock units 1-7 are deposited in horizontal layers 2. Igneous sill intrudes between rock units 4 and 5. 3. 4. 5. 6. 7. 3. Absolute dating A rock is collected from the granite pluton for absolute dating. It contains 40K which has a half-life of 1.25 x 10 years. If 25% of the original 40K remains today, how old is the rock in billions of years?
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