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The Laramide Mesa formation and the Ojo de Agua caldera, southeast of the Cananea copper mining district, Sonora, Mexico

Scientific Investigations Report 2006-5022

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Abstract

The Mesa Formation extends from Cananea, Mexico, southeast to the Sonora River and is the main host rock of Laramide porphyry copper deposits in the Cananea District and at the Alacran porphyry prospect to the east. The Mesa consists of two members-a lower andesite and an upper dacite. The lowest part of the dacite member is a crystal tuff about 100 m thick. This tuff is the outfall of a caldera centered near the village of Ojo de Agua, dated by 40Ar/39Ar at 65.8 Ma ?0.4. The Ojo de Agua Caldera is about 9 km in diameter and is filled by a light gray biotite dacite tuff with abundant flattened pumice fragments. The volume of the caldera is estimated to be 24 km3.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
The Laramide Mesa formation and the Ojo de Agua caldera, southeast of the Cananea copper mining district, Sonora, Mexico
Series title:
Scientific Investigations Report
Series number:
2006-5022
Edition:
-
Year Published:
2006
Language:
ENGLISH
Contributing office(s):
Western Mineral Resources
Description:
iii, 7p.
Online Only (Y/N):
Y