Solid Earth Sciences (S)
Session Sub-categoryGeochemistry(GC)
Session IDS-GC40
TitleVolatile Cycles in the Deep Earth - from Subduction Zone to Hot Spot
Short TitleVolatile Cycles in the Deep Earth
Main Convener NameHirochika Sumino
AffiliationDepartment of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo
Co-Convener 1NameTakeshi Hanyu
AffiliationJapan Agency for Marine-Earth Science and Technology, Department of Solid Earth Geochemistry
Co-Convener 2NameYuji Sano
AffiliationDivision of Ocean and Earth Systems, Atmosphere and Ocean Research Institute, University of Tokyo
Co-Convener 3NameGray E Bebout
AffiliationLehigh University
Session LanguageE
ScopeVolatiles play an important role in the geodynamics and chemical differentiation in the mantle and crust by drastically changing mineral stability and rheological behavior. Fractionation-processes such as partial melting, hydration, and dehydration are all controlled by volatiles in the rocks. A significant portion of the volatiles in the Earth has been thought to be present in the atmosphere and oceans as a consequence of extensive degassing during accretion and subsequent mantle degassing. On the other hand, it has been recently recognized that substantial amounts of volatiles are recycled back into the mantle at subduction zones, where intensive devolatilization of descended materials during arc magma generation was once thought to act as an effective "subduction barrier". However, fundamental questions still remain, such as: how are volatiles species distributed throughout the early and present Earth? What are the mechanisms for, and rate at which, volatiles are fluxed between the atmosphere, crust, and mantle? And what role have volatiles played in driving the evolution of the Earth? The possible role of the core in storing primordial volatiles is also poorly constrained. We therefore welcome contributions from experimental, observational, and modeling studies that help shed light on the deep cycles of volatiles, such as hydrogen, carbon, nitrogen, noble gases, halogens and sulfur. We particularly encourage studies linking the behavior of multiple volatile elements and their isotopic compositions. Studies investigating the linkage between volatile and solid geochemical tracers, the phase equilibria of volatile-bearing mantle assemblages, and the effect of volatiles on the physical properties of the mantle are also welcome.
Presentation FormatOral and Poster presentation
Joint Session withAGU
Invited AuthorsRay Burgess (University of Manchester)
Jun Korenaga (Department of Geology and Geophysics, Yale University)
TimePresentation NoTitlePresenterAbstract
Oral Presentation May 29 PM1
13:45 - 14:15SGC40-01Continental growth, crustal recycling, and global water cycleJun Korenaga
14:15 - 14:30SGC40-02Role of volatiles in magma genesis of ascending mantle plumeEiichi Takahashi
14:30 - 14:45SGC40-03DH partitioning experiment among high-pressure polymorph of olivineAsami Sano-Furukawa
14:45 - 15:00SGC40-04Formation of Fe-rich volatile-bearing phases in the deep lower mantle and the implications for deep Earth volatile cyclesLi Zhang
15:00 - 15:15SGC40-05Estimation of the origin of Pitcairn Island OIB by Independent Component AnalysisTakahiro Ozawa
Oral Presentation May 29 PM2
15:30 - 16:00SGC40-06Tracing recycled volatiles in MORB with halogensRay Burgess
16:00 - 16:15SGC40-07Volatile composition in ocean island basaltsTakeshi Hanyu
16:15 - 16:30SGC40-08Halogen heterogeneity in the subcontinental lithospheric mantleHirochika Sumino
16:30 - 16:45SGC40-09Efficiency of Deep Carbon Subduction: Input, Metamorphic Records, and Bearing on Estimated Sources of Arc Volcanic GasesGray E Bebout
16:45 - 17:00SGC40-10Helium isotope variations in subduction-type volcanic hydrothermal systemsYuji Sano
Presentation NoTitlePresenterAbstract
Poster Presentation May 29 AM2
SGC40-P01Continental growth models demystifiedJun Korenaga
SGC40-P02Mass-independent sulfur isotope signature from the 2.7 Ga Belingwe komatiite: Recycling of crustal material in ArcheanYusuke Kubota
SGC40-P03Determination of halogens in some standard materials using the neutron irradiation noble gas mass spectrometric techniqueHirochika Sumino
SGC40-P04FTIR spectroscopy and noble gas mass spectrometry for a single olivine grainSota Niki
SGC40-P05New halogen incorporation mechanism in serpentine group minerals: Crystal chemical considerationMasami Kanzaki
SGC40-P06Mineralogical and geochemical characteristics of cuttings from Taketomi hot springNoriyuki Shingaki
SGC40-P07Variation of helium isotope compositions at Lake MashuTakanori Kagoshima
SGC40-P08Helium isotopes in Tachibana Bay and Shimabara Bay, NagasakiMa. Teresa Escobar