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A Tale of Two Planets

Anderson, Don L. (1999) A Tale of Two Planets. International Geology Review, 41 (12). pp. 1051-1057. ISSN 0020-6814. doi:10.1080/00206819909465190.

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Most of Earth's volcanism occurs at plate boundaries—mid-ocean ridges and island arcs. Most of the ^3He and other noble gases also are expelled from the interior at these locations. A small amount, compared to the global budget, of magma (<10%) and ^3He («1%) escapes at mid-plate volcanoes, the so-called “hotspots.” Locations of hotspots are controlled by stresses and cracks, not by deep, narrow mantle upwellings. Most, or all, of Earth's volatile inventory appears to have been brought in by a late veneer. The high ^3He content and high He/Ne and He/Ar ratios of mid-ocean ridge basalts, plus the excess ^(129)Xe and ^(136)Xe, suggest that the ridge basalt reservoir is relatively undegassed and that there is no primordial undegassed reservoir. The two prevailing views of the origin of Earth are summarized in the context of this information.

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Additional Information:© 1999 by V. H. Winston & Son. Inc. Version of record first published: 06 Jul 2010.
Issue or Number:12
Record Number:CaltechAUTHORS:20121010-112755565
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Official Citation:Don L. Anderson (1999): A Tale of Two Planets, International Geology Review, 41:12, 1051-1057 To link to this article:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34822
Deposited By: Ruth Sustaita
Deposited On:10 Oct 2012 19:49
Last Modified:09 Nov 2021 23:10

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