See more from this Division: Topical Sessions
See more from this Session: Mixed Siliciclastic-Carbonate Systems: Mixing through Time and Space
Abstract:
New U-Pb geochronologic analyses of Middle to Late Ordovician Kinnikinc Quartzite, Idaho, and Late Ordovician Cable Canyon Sandstone, New Mexico detrital zircons by the LA-ICPMS, provide a test for the single-source long-distance transport model. The Middle-Late Ordovician Kinnikinic Quartzite in east-central Idaho was deposited directly on Early Ordovician plutons and Mesoproterozoic metasedimentary rocks. The basal Kinnikinic Quartzite locally contains abundant 1.6-1.7 Ga detrital zircons interpreted to be recycled from the Mesoproterozoic metasedimentary rocks upon which they were deposited. Additionally, samples south of the Snake River Plain contain predominantly Archean (2.6-2.8 Ga) grains derived from the Wyoming Craton. The Cable Canyon Sandstone contains some 1.4 Ga, and many 1.6-1.7 Ga grains interpreted to indicate local anorogenic granites and Yavapai-Matzatzal terranes, respectively, exposed along the Transcontinental Arch. Detrital zircon analyses indicates local sources as well as the Talson-Thelon Orogen (widespread abundance of 1.8 Ga zircons) are the main sediment sources in the western Cordillera during deposition of Middle to Late Ordovician quartzites.
See more from this Division: Topical Sessions
See more from this Session: Mixed Siliciclastic-Carbonate Systems: Mixing through Time and Space