The North American Cordilleran Anatectic Belt
نویسندگان
چکیده
The North American Cordilleran Anatectic Belt (CAB) is a ~3,000 km long region in the hinterland of Cordillera that comprises numerous exposures Late Cretaceous to Eocene intrusive rocks and anatectic associated with crustal melting. As such, it comparable size volume major provinces including Himalayan leucogranite belt. CAB are chiefly peraluminous, muscovite-bearing produced primarily by anatexis Proterozoic Archean metasedimentary rocks. lack extrusive equivalents were typically emplaced as thick sheets, laccoliths, dike/sill complexes. extent, location, age suggests integral understanding tectonic evolution America, however, belt rarely considered whole. This paper reviews localities melting compiles geochemical, geochronologic, isotopic data evaluate melt conditions processes generated these geochemistry partial temperatures (ca. 675–775 °C) support water-absent muscovite dehydration and/or water-deficient primary reactions generally inconsistent water-excess high-temperature (biotite amphibole) oldest central U.S. become younger towards both north south. At any single appears have been protracted process (≥10 Myr) evidence for re-melting remobilization magmas common. End-member hypotheses origin include decompression, thickening, fluid-flux melting, increased heat flux from mantle. Different parts different no model may be able explain entirety event. Regardless, distinct component orogenic system.
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ژورنال
عنوان ژورنال: Earth-Science Reviews
سال: 2021
ISSN: ['0012-8252', '1872-6828']
DOI: https://doi.org/10.1016/j.earscirev.2021.103576