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Creator:: Koppers, Anthony A. P. and Watts, Anthony B.
Abstract:: Seamounts are windows into the deep Earth that are helping to elucidate various deep Earth processes. For example, thermal and mechanical properties of oceanic lithosphere can be determined from the flexing of oceanic crust caused by the growth of seamounts on top of it. Seamount trails also are excellent recorders...
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Full Text:: mostly are not vertically straight, narrow, and continuous, but often Anthony A.P. Koppers (akoppers

Creator:: Watts, Anthony B., Koppers, Anthony A. P., and Robinson, David P.
Abstract:: Seamounts are ubiquitous features of the seafloor that form part of the fabric of oceanic crust. When a seamount enters a subduction zone, it has a major affect on forearc morphology, the uplift history of the island arc, and the structure of the downgoing slab. It is not known, however,...
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Full Text:: shows the approximate location of the 1982 Mw = 7.0 earthquake (Mochizuki et al., 2008). (c) Deep

Creator:: Koppers, Anthony A. P., Staudigel, Hubert, and Duncan, Robert A.
Abstract:: We report new ⁴⁰Ar/³⁹Ar ages for the oldest Pacific oceanic floor at Ocean Drilling Program Site 801C in the Pigafetta basin and Site 1149D close to the Izu-Bonin subduction zone in the Nadezhda basin. These ages were determined by applying high-resolution incremental heating experiments (including 15–30 heating steps) to better...
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Full Text:: oldest oceanic basement basalts in the western Pacific basin Anthony A. P. Koppers and Hubert Staudigel

Creator:: Koppers, Anthony A. P., Staudigel, Hubert, Pringle, Malcolm S., and Wijbrans, Jan R.
Abstract:: South Pacific intraplate volcanoes have been active since the Early Cretaceous. Their HIMU-EMI-EMII mantle sources can be traced back into the West Pacific Seamount Province (WPSP) using plate tectonic reconstructions, implying that these distinctive components are enduring features within the Earth's mantle for, at least, the last 120 Myr. These...
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Full Text:: volcanism in the South Pacific: Hot spots or extensional volcanism? Anthony A. P. Koppers and Hubert

Creator:: Koppers, Anthony A. P., Duncan, Robert A., and Steinberger, Bernhard
Abstract:: The Louisville seamount trail has been recognized as one of the key examples of hot spot volcanism, comparable to the classic volcanic Hawaiian-Emperor lineaments. The published total fusion ⁴⁰Ar/³⁹Ar data of Watts et al. [1988] showed an astonishing linear age progression, firmly establishing Louisville as a fixed hot spot in...
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Full Text:: progression along the Louisville seamount trail for models of fixed and moving hot spots Anthony A. P

Creator:: Hart, Stanley R., Staudigel, H., Koppers, Anthony A. P., and Girard, A. P.
Abstract:: On 3 April 2001, a 20 kg point source of fluorescein dye was released 30 m above the bottom of the active summit caldera of Vailulu’u submarine volcano, Samoa. Vailulu’u crater is 2000 m wide and at water depths of 600–1000 m, with the bottom 200 m completely enclosed; it...
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Full Text:: ± 1.5 hours, as follows: (1) several of the galvanic links were tested in the lab in seawater at 5.3�C

Creator:: Helly, John, Staudigel, Hubert, and Koppers, Anthony A. P.
Abstract:: Many Earth science disciplines are currently experiencing the emergence of new ways of data publication and the establishment of an information technology infrastructure for data archiving and exchange. Building on efforts to standardize data and metadata publication in geochemistry [Staudigel et al., 2002], here we discuss options for data publication,...
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Full Text:: , Mail Code 0527, La Jolla, California 92093, USA (hellyj@ucsd.edu) Hubert Staudigel and Anthony Koppers

Creator:: Staudigel, H., Hart, Stanley R., Koppers, Anthony A. P., Constable, C., Workman, R., Kurz, M., and Baker, E. T.
Abstract:: The summit crater of Vailulu’u Seamount, the youngest volcano in the Samoan chain, hosts an active hydrothermal system with profound impact on the ocean water column inside and around its crater (2 km wide and 407 m deep at a 593 m summit depth). The turbidity of the ocean water...
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Full Text:: Oceanographic Institution, Woods Hole, Massachusetts 02543, USA (shart@whoi.edu) A. A. P. Koppers and C

Creator:: Koppers, Anthony A. P., Staudigel, Hubert, Hart, Stanley R., Young, Craig, and Konter, Jasper G.
Abstract:: Vailulu’u seamount is an active underwater volcano that marks the end of the Samoan hotspot trail (Hart et al., 2000). Vailulu’u has a simple conical morphology (Figure 1) with a largely enclosed volcanic crater at relatively shallow water depths, ranging from 590 m (highest point on the crater rim) to...
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Full Text:: 2) and warms the crater water mass by about 0.5°C compared to open ocean water. Large temperature

Creator:: Tauxe, Lisa, Constable, Catherine, Johnson, Catherine L., Koppers, Anthony A. P., Miller, Winter R., and Staudigel, Hubert
Abstract:: The issue of permanent nondipole contributions to the time-averaged field lies at the very heart of paleomagnetism and the study of the ancient geomagnetic field. In this paper we focus on paleomagnetic directional results from igneous rocks of the southwestern U.S.A. in the age range 0–5 Ma and investigate both...
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Full Text:: . recorded by 0–5 Ma igneous rocks Lisa Tauxe, Catherine Constable, Catherine L. Johnson, Anthony A. P

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