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- W2086076026 abstract "40Ar/39Ar dates recorded by hornblende and muscovite from Proterozoic rocks in northern New Mexico indicate pervasive Mesoproterozoic metamorphism followed by a protracted uplift/cooling history. Most hornblendes yield 40Ar/39Ar dates of 1.43‐1.35 Ga, which record cooling through temperatures of ca. 500°C. This suggests that a regional amphibolite facies metamorphism (500‐550°C, 3.5‐4 kbars occurred at ca. 1.4 Ga. This metamorphism was superimposed on Paleoproterozoic amphibolite grade rocks at mid‐crustal depths of 10‐15 km. Contact metamorphic aureoles associated with 1.4 Ga plutons emplaced at 2.5‐4 kbars (8‐15 km) in the Sandia and Manzano Mountains record nearly concordant hornblende and muscovite 40Ar/39Ar dates of 1.4 Ga. These suggest relatively rapid cooling to ambient conditions of <300°C following the 1.4 Ga thermal event. Slightly younger (1.37‐1.31 Ga) dates are recorded by muscovite throughout northern New Mexico and by hornblende within high‐grade tectonic blocks. These are interpreted to record more protracted cooling following the 1.4 Ga metamorphism. Tectonic blocks with the highest metamorphic grades (both P and T) in northern New Mexico record the youngest hornblende and muscovite dates. Metamorphic grade decreases and 40Ar/39Ar mineral ages increase southward. This suggests differential unroofing (1.4‐1.0 Ga) of contrasting levels of a slowly cooled middle crust with a Mesoproterozoic (post‐1.4 Ga) thermal structure. Regional metamorphism at 1.4 Ga reflects fluid and magma advection into the crust during asthenospheric upwelling beneath southern Laurentia; 1.4 Ga metamorphism accompanied widespread but partitioned contractional deformation that affected interior Laurentia >1000 km from a probable compressive or transpressive plate margin." @default.
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- W2086076026 title "<sup>40</sup>Ar/<sup>39</sup>Ar Evidence For 1.4 Ga Regional Metamorphism in New Mexico: Implications For Thermal Evolution of Lithosphere in the Southwestern Usa" @default.
- W2086076026 doi "https://doi.org/10.1086/515912" @default.
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