Essentials of Geology, Books a la Carte Edition (13th Edition)
13th Edition
ISBN: 9780134609942
Author: Frederick K. Lutgens, Edward J. Tarbuck, Dennis G. Tasa
Publisher: PEARSON
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Question
Chapter 18, Problem 1GST
To determine
The sequence of formation of features present in the accompanying image showing metamorphic rock gneiss, a basaltic dike and a fault with logic.
Expert Solution & Answer
Answer to Problem 1GST
The sequence of formation of features present in the image from older to younger is Gneiss, dike, fault. Gneiss must have formed before the intrusive dike, in order for it to cut through gniess. Because the fault offsets the dike, the fault occurred after the intrusion of dike. This is an application of the principle of cross-cutting relationships.
Explanation of Solution
“Principle of cross-cutting relationships states that the geological feature which cuts across strata is always younger than the one it cuts through it” A fault is a break or fracture in the rock, along which the displacement occurs.
According to the principle of cross-cutting relationship, the igneous dike is younger and formed after the metamorphic rock Gneiss that cuts through it. Gneiss is a high grade foliated metamorphic rock and must have formed before the dike, otherwise the dike would have been metamorphosed too. The fault has split and separated the dike, hence the igneous dike must have formed before the fault occurred.
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Chapter 18 Solutions
Essentials of Geology, Books a la Carte Edition (13th Edition)
Ch. 18.1 - Prob. 1CCCh. 18.1 - Prob. 2CCCh. 18.1 - Prob. 3CCCh. 18.1 - Prob. 4CCCh. 18.2 - Prob. 1CCCh. 18.2 - Prob. 2CCCh. 18.2 - Prob. 3CCCh. 18.3 - Prob. 1CCCh. 18.3 - Prob. 2CCCh. 18.3 - Prob. 3CC
Ch. 18.3 - Prob. 4CCCh. 18.4 - Prob. 1CCCh. 18.4 - Prob. 2CCCh. 18.4 - Prob. 3CCCh. 18.4 - Prob. 4CCCh. 18.5 - Prob. 1CCCh. 18.5 - Prob. 2CCCh. 18.6 - Prob. 1CCCh. 18.6 - Prob. 2CCCh. 18.6 - Prob. 3CCCh. 18.6 - Prob. 4CCCh. 18 - Prob. 1GSTCh. 18 - Prob. 2GSTCh. 18 - Prob. 3GSTCh. 18 - Prob. 4GSTCh. 18 - Prob. 5GSTCh. 18 - Prob. 6GSTCh. 18 - Prob. 7GSTCh. 18 - Prob. 8GSTCh. 18 - Prob. 9GSTCh. 18 - Prob. 10GSTCh. 18 - Prob. 11GSTCh. 18 - Prob. 12GST
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