Ages of batholithic intrusions of northern and central Chile

Geological Society of America Bulletin
By: , and 



Their stratigraphic setting demonstrates that three batholithic intrusions in northern and central Chile are respectively pre-Jurassic, Jurassic, and Cretaceous. Radiometric age determinations, by the lead-alpha (Larsen) method, indicate ages of 265 ± 30, 120 ± 15 to 125 ± 15, and 95 ± 10 to 130 ± 15 million years respectively for samples from the batholiths whose stratigraphic setting has been established or is inferred. With one exception, the radiometric ages are consistent with the stratigraphy. The exceptional determination of 130 ± 15 million years was for a sample of granite that intrudes Cretaceous rocks. Three other samples of Cretaceous granitic rocks were within the range of 95 ± 10 to 105 ± 10 million years. Angular unconformities whose ages are correlative with the intrusions suggest that the three batholiths can be related respectively to Hercynian, Late Jurassic, and middle Cretaceous orogenies. 

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Publication type Article
Publication Subtype Journal Article
Title Ages of batholithic intrusions of northern and central Chile
Series title Geological Society of America Bulletin
DOI 10.1130/0016-7606(1961)72[1551:AOBION]2.0.CO;2
Volume 72
Issue 10
Year Published 1961
Language English
Publisher Geological Society of America
Description 9 p.
First page 1551
Last page 1559
Country Chile
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