Questions
GEL 020 001 FQ 2025 Quiz for Lecture 6 (10/13)
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Place the following events in the geologic history of California in chronological order, with 1 being oldest and 5 youngest. 1: intrusion of 90% of the Sierran Batholith 2: formation of a passive margin 3: development of an Andean-type margin 4: terrane accretion 5: erosion to expose the batholith
Options
A.[ 选择 ]
B.1
C.3
D.2
E.4
F.5
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Step-by-Step Analysis
To analyze the chronological order, I’ll restate the items and then examine how each event typically fits into California’s geologic history.
Option list: 1) intrusion of 90% of the Sierran Batholith, 2) formation of a passive margin, 3) development of an Andean-type margin, 4) terrane accretion, 5) erosion to expose the batholith.
First, consider what each event implies in time. The Sierran Batholith intrusions mark a major Mesozoic magmatic episode that builds intrusion bodies deep in the crust; such plutons are generally tied to subduction-related arc activity and occur after some initial margin setting but before later crustal modifications that expose or adorn the surface.
Now evaluate the options one by one:
Option 1: Intrusion of 90% of the Sierran Batholith. This represents a plutonic episode that occurred deep in the crust during the Mesozoic, primarily in the Late Jurassic to Early Cretaceous, and is typically among the older high-crustal processes in the sequence of western North America. This is consistent with placing it early in the history, before surface-exposed processes dominate later stages.
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