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Detailed File Information
Tumult in Samoa
File Name hart.staudigel.ppt
Data Type presentation
Computer Program Microsoft Powerpoint 2003
File Size 24.90 MB - 1 file
Expert Level College and Introduction to Science
Contributor Hubert Staudigel
Source No source
Resource Matrix The Formation of Seamounts
Description
Is the Samoan volcanic chain the result of a hotspot or plume? Or not? Argued for decades, the discovery of volcanic activity at Vailulu'u seamount certainly supports the hotspot/plume model. Vailulu'u anchors the east end of the Samoan chain, much as Loihi anchors the Hawaiian chain's east end. The Samoan volcanic centers get older to westward, and are aligned with Pacific plate motion. This trend of aging is broken only by the voluminous young rejuvenated volcanism on Savai┬┐i, a large island some 370 km west of Vailulu'u. Volcanism all along the chain has characteristic and unusual Sr, Nd, and Pb isotopic signatures, affirming a common Samoan pedigree. However, in this keynote presentation during the First SBN Workshop Stan Hart and Hubert Staudigel discuss a completely different aspect of Vailulu'u seamount, namely its summit crater which hosts active hydrothermal venting, with a power output of some 600 megawatts (measured by a dye release experiment). The crater waters are remarkably high in manganese, iron, helium-3 and particulates, and a resurgent volcanic cone ~300 meters high has grown in the crater since 2001. The hydrothermal power drives a remarkably complex and dynamic circulation system in and surrounding the summit crater.
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