40Ar-39Ar dating and tectonic implications of volcanic rocks recovered at IODP Hole U1342A and D on Bowers Ridge, Bering Sea

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doi: 10.1016/j.dsr2.2015.03.008
Author(s): Sato, Keiko; Kawabata, Hiroshi; Scholl, David W.; Hyodo, Hironobu; Takahashi, Kozo; Suzuki, Katsuhiko; Kumagai, Hidenori
Author Affiliation(s): Primary:
Japan Agency for Marine-Earth Science and Technology, Institute for Research on Earth Evolution, Yokosuka, Japan
U. S. Geological Survey, United States
Okayama University, Japan
Kyushu University, Japan
Volume Title: Plio-Pleistocene paleoceanography of the Bering Sea
Volume Author(s): Takahashi, Kozo, editor; Ravelo, A. Christina; Okazaki, Yusuke
Source: Plio-Pleistocene paleoceanography of the Bering Sea, edited by Kozo Takahashi, A. Christina Ravelo and Yusuke Okazaki. Deep-Sea Research. Part II: Topical Studies in Oceanography, Vol.125-126, p.214-226. Publisher: Elsevier, Oxford, International. ISSN: 0967-0645
Note: In English. 34 refs.; illus., incl. 2 tables, sketch map
Summary: During the Integrated Ocean Drilling Program (IODP), a total of 41.54 m of basement rock, consolidated volcaniclastic sediment, was recovered beneath a thin sediment cover. The drilled site is at the eastern end of the crestal area of Bowers Ridge, a north and westward sweeping offshoot of the Aleutian Arc into the Bering Sea. The volcanic sequence recovered from Holes U1342A and U1342D was divided into six major lithologic units. We used the single grain 40Ar-39Ar dating method performed by step-wise heated laser fusion technique to date andesites of Unit 1. Thereby two ages of Oligocene volcanism (34-32 Ma, 28-26 Ma) were distinguished each other according to our 40Ar-39Ar data. These ages refute a hypothesized Cretaceous origin in the North Pacific as an exotic arc massif or sector of the Hawaiian-Emperor chain and indicate that the Bowers Ridge is a Bering-Sea formed arc or remnant arc that ceased forming in the latest Oligocene to the earliest Miocene time. Abstract Copyright (2016) Elsevier, B.V.
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 03 Geochronology; 05 Petrology, Igneous and Metamorphic; Absolute age; Andesitic composition; Ar/Ar; Basaltic composition; Bering Sea; Bowers Ridge; Cenozoic; Clastic rocks; Conglomerate; Cores; Expedition 323; Geochemistry; IODP Site U1342; Igneous rocks; Integrated Ocean Drilling Program; Major elements; North Pacific; Northwest Pacific; Pacific Ocean; Plate tectonics; Sedimentary rocks; Tectonics; Tertiary; Theoretical models; Volcanic rocks; Volcaniclastics; Volcanism; West Pacific
Coordinates: N544942 N544942 E1765504 E1765504
Record ID: 2017013139
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands