نتایج جستجو برای: pillow lava
تعداد نتایج: 3786 فیلتر نتایج به سال:
Abstract Maio Island (Cabo Verde Archipelago) is composed of uplifted Early Mesozoic MORB-type pillow lavas and deep-sea sediments, unconformably overlain intruded by Miocene igneous rocks. Combined structural analyses 40 Ar– 39 Ar dating were used to constrain the evolution Maio. Structures ages sequences crosscutting dykes showed that numerous intrusive events associated with intense growth a...
[1] Side-scan sonar, submersible observations and sampling of lava flows from the East Pacific Rise, 17 –19 S constrain the character and variability of submarine volcanic eruptions along mid-ocean ridges. Nine separate lava sequences were mapped using relative age and lithological contrasts among recovered samples. Axial lengths activated during eruptive episodes range from 1 to >18 km; indivi...
During late 1999/early 2000, the solid state imaging experiment on the Galileo spacecraft returned more than 100 high-resolution (5 to 500 meters per pixel) images of volcanically active Io. We observed an active lava lake, an active curtain of lava, active lava flows, calderas, mountains, plateaus, and plains. Several of the sulfur dioxide-rich plumes are erupting from distal flows, rather tha...
[1] Exogenous growth of Peléean lava domes involves the addition of lava from a central summit vent and mass wasting on the flanks as rockfalls and pyroclastic flows. These processes were investigated at the Soufrière Hills Volcano, Montserrat, between 30 March and 10 April 2006, using a ground-based imaging millimeter-wave radar, AVTIS, to measure the shape of the dome and talus surface and ro...
[Purpose] The purpose of this study is to examine changes in pulmonary functions in relation to the sleeping positions of the experimental subjects. [Subjects and Methods] The subjects for this study were twenty randomly selected males and females from K University. Measurements were taken in the supine position at three different pillow heights: 0 cm, 5 cm, and 10 cm. Pulmonary functions (vita...
Introduction: The very high temperatures that have been reported for lavas on Io [e.g., 1-4] have proven to be difficult to explain [5,6]. Specifically, the estimates of lava temperatures ≥1600 °C require that the interior of Io either (1) have an extremely unusual chemistry or (2) be almost completely molten. Neither of these possibilities fits within our current understanding of the evolution...
Ascertaining the emplacement mechanism of oceanic basaltic lavas is important in understanding how ocean floor topography produced and plates evolve, particularly during early stages crustal development a supra-subduction zone. A detailed study volcanic stratigraphy at International Ocean Discovery Program (IODP) Site U1438 Amami Sankaku Basin, west Kyushu–Palau Ridge, has revealed lava accreti...
The best preserved and most complete lava flow sequences of the Central Atlantic Magmatic Province (CAMP) in Morocco are exposed High Atlas can reach up to 300 m thickness. Four distinct formations, emplaced subaerial environments, classically recognized: Lower, Intermediate, Upper Recurrent formations. These formations separated by paleosoils sedimentary (mudstones, siltstones, sandstones, lim...
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