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Provenance Of And Age Of Granitoid And Sandstone Clasts In Conglomerates Of The Paleocene To Upper Cretaceous Yakutat Group, Russell Fjord, Alaska, Alexander Dolcimascolo
Provenance Of And Age Of Granitoid And Sandstone Clasts In Conglomerates Of The Paleocene To Upper Cretaceous Yakutat Group, Russell Fjord, Alaska, Alexander Dolcimascolo
Honors Theses
The Paleocene to Upper Cretaceous Yakutat Group consists of a flysch facies. A conglomerate occurs in two places in Russell Fjord, and the composition and age of clasts bears on tectonic reconstructions. One site (#23) occurs in what is mapped as flysch and one in the mélange (#25), but the conglomerates are essentially identical. They contain clasts of sandstone, greenstone, limestone, marble, chert, and plutonic rocks that are clast supported, and interbedded with sandstones that contain coalified plant fragments. The maximum depositional age (MDA) of the U/Pb-dated zircons from the sandstone is 65.9 ± 1.8 Ma and 65.6 ± 2.2 …