Extension of Laramide magmatism in southwestern North America into Trans-Pecos Texas

A. K. Gilmer, J. R. Kyle, J. N. Connelly, R. D. Mathur, C. D. Henry

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The Red Hills intrusion hosts the easternmost porphyry copper-molybdenum system in southwestern North America and consists of quartz-sulfide stockwork veins in sericitized porphyritic quartz monzonite. Zircon U-Pb and molybdenite Re-Os analyses yield ages of 64.2 ± 0.2 Ma and 60.2 ± 0.3 Ma, respectively, indicating that the Red Hills intrusion and mineralization are distinctly older than all other Tertiary magmatism (48-17 Ma) in the Trans-Pecos region of Texas, including the nearby 32 Ma Chinati Mountains caldera. The Red Hills intrusive system is contemporaneous with and genetically related to other Laramide magmatic systems (75-54 Ma) that host porphyry copper deposits in Arizona, southwestern New Mexico, and northern Mexico. These results significantly extend the Laramide magmatic province eastward and suggest that Laramide subduction-related magmatism and deformation are coextensive over a broad area of southwestern North America.

Original languageEnglish (US)
Pages (from-to)447-450
Number of pages4
Issue number5
StatePublished - May 2003

All Science Journal Classification (ASJC) codes

  • Geology


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