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Cambrian-Ordovician (500 Ma) alkalic plutonism in southwestern New Mexico: U-Th-Pb isotopic data from the Florida Mountains

American Journal of Science

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Abstract

A major alkalic igneous suite in the Florida Mountains of southwestern New Mexico has been dated by the U-Th-Pb method on zircon as latest Cambrian to earliest Ordovician. The results firmly document the presence of lower Paleozoic alkalic plutons in southwestern New Mexico. Implications of these data include: 1) a diamictite that nonconformably overlies the plutonic complex is not Late Proterozoic as suggested by previous workers on the basis of correlation with similar deposits in the Cordillera; 2) the Bliss Sandstone, thought to be Late Cambrian in the Florida Mountains area, is clearly in depositional contact with the alkalic plutonic complex and must be younger than 503??10 Ma; and 3) the alkalic plutonism, a type commonly associated with extensional tectonics, may have considerable significance in deciphering the poorly understood early Paleozoic tectonics in this region. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Cambrian-Ordovician (500 Ma) alkalic plutonism in southwestern New Mexico: U-Th-Pb isotopic data from the Florida Mountains
Series title:
American Journal of Science
Volume
288
Issue:
7
Year Published:
1988
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
735
Last page:
755
Number of Pages:
21