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

doi:10.1130/0091-7613(2003)031<0447:EOLMIS>2.0.CO;2

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

Earth and Environmental Systems Institute

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	447-450
Number of pages	4
Journal	Geology
Volume	31
Issue number	5
DOIs	https://doi.org/10.1130/0091-7613(2003)031<0447:EOLMIS>2.0.CO;2
State	Published - May 2003

All Science Journal Classification (ASJC) codes

Geology

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10.1130/0091-7613(2003)031<0447:EOLMIS>2.0.CO;2

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title = "Extension of Laramide magmatism in southwestern North America into Trans-Pecos Texas",

abstract = "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.",

author = "Gilmer, {A. K.} and Kyle, {J. R.} and Connelly, {J. N.} and Mathur, {R. D.} and Henry, {C. D.}",

year = "2003",

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AU - Kyle, J. R.

AU - Connelly, J. N.

AU - Mathur, R. D.

AU - Henry, C. D.

PY - 2003/5

Y1 - 2003/5

N2 - 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.

AB - 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.

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

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