Systematics of halogen elements and their radioisotopes in thermal springs of the Cascade Range, Central Oregon, Western USA [rapid communication]

Details Systematics of halogen elements and their radioisotopes in thermal springs of the Cascade Range, Central Oregon, Western USA [rapid communication] Systematics of halogen elements and their radioisotopes in thermal springs of the Cascade Range, Central Oregon, Western USA [rapid communication]

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005e%26psl.235..700h&link_type=abstract

Earth and Planetary Science Letters, Volume 235, Issue 3-4, p. 700-714.

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7

Scientific paper

This study quantifies the cycling of halogen elements through the Cascadia subduction zone based on the chemistry of thermal springs in the Central Oregon Cascade Range and of a mineral spring in the forearc (Willamette Valley). Considerations based on mass balances, element ratios, and 36Cl/Cl and 129I/I ratios suggest that halogens discharged through the thermal springs in the Cascade Range are probably derived from magma degassing. Our results indicate that < 35% of the subducted Cl and < 20% of the subducted Br and I could be transported through arc volcanism and the thermal springs, a considerably lower percentage than estimated for other volcanic arcs along the Pacific Rim. A likely explanation for this difference is that a large fraction of the halogens is released from the slab at shallow depths into the serpentinized sub-forearc mantle because of the relatively high temperatures in the subducting Juan de Fuca plate. The small fraction of halogens subducted to depth probably also indicates a low rate of water transport, which is consistent with the observation that the Cascade Range sub-arc mantle is relatively dry and has a low degree of volcanic vigor, compared with other arcs.

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