Crystal–melt partitioning of noble gases (helium, neon, argon, krypton, and xenon) for olivine and clinopyroxene

Heber, V. S.; Brooker, Richard A.; Kelley, Simon P.; Wood, Bernard J.

doi:10.1016/j.gca.2006.11.010

Cited by 163 publications

(137 citation statements)

References 60 publications

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“…Hence even if a mantle plume originated from such a phase in the lower mantle, it will be easily affected by surrounding materials during its rise and seems quite difficult to keep the high 3 He/ 4 He. Recently, Heber et al (2007) have reported new crystal-melt partitioning data of He for olivine and clinopyroxene crystals in the order of 10 -4 . However, the He/U in olivine crystals is still higher than the melt and the same conjecture is applied as shown above.…”

Section: Evaluation Of Geochemical Models Based On Noble Gas Signaturesmentioning

confidence: 99%

On the degassing state and the chemical structure of the Earth's interior inferred from noble gas isotopes-Past and recent views

Kaneoka

2008

Geochem. J.

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The degassing state of the Earth's interior is one of the main issues in relation to the evolution of the Earth and has been discussed by many investigators over several decades. I outline some trials to reveal the state of degassing based on noble gas isotopes. Then, based on noble gas isotope signatures so far obtained, I discuss models of the chemical structure of the Earth's interior which are inevitably related to the degassing state of the Earth. I propose a preferred model which suggests the possibility for the occurrence of relatively undegassed and possibly less fractionated reservoir(s) in the Earth's deep interior, which might be located in a relatively non-convective mantle.

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Section: Evaluation Of Geochemical Models Based On Noble Gas Signaturesmentioning

confidence: 99%

On the degassing state and the chemical structure of the Earth's interior inferred from noble gas isotopes-Past and recent views

Kaneoka

2008

Geochem. J.

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“…reported olivine-melt partition coefficients for helium suggesting that helium may be more compatible than U and Th during melting of a cpx-poor lherzolite or harzburgite. However, Heber et al (2007) report values that are over an order of magnitude smaller (less compatible), suggesting the helium may be more compatible than U and Th only when melting cpx-poor harzburgites or dunites. The discrepancy in olivine-melt helium partition coefficients between these two studies is not yet resolved.…”

Section: Requires Thatmentioning

confidence: 95%

“…However, the assumption of increased 238 U/ 3 He in DMM over time is realistic given the lherzolitic lithology of DMM, a mantle reservoir that hosts an estimated cpx modal abundance of ~13% (Workman et al, 2005). Results from a recent helium partitioning study (Heber et al, 2007) are consistent with helium being less compatible than U and Th (assuming U and Th partition coefficients from a recent compilation [Kelemen et al, 2003]) during mantle melting of a lherzolite lithology. However, helium partitioning during mantle melting is a controversial subject.…”

Section: Requires Thatmentioning

confidence: 96%

“…By contrast, the TITAN elements will be By contrast, subducted oceanic crust that conserves much of its original U and Th budget through the subduction zone will not possess positive TITAN anomalies and will produce more 4 He over time than a U and Th-depleted slab. Consequently, the abundant 4 He produced by an undepleted slab would infect the surrounding mantle with radiogenic 4 He due to rapid diffusion of helium in the mantle (Hart, 1984;Trull and Kurz, 1993;Hart et al, 2007), and is not compatible with the preservation of a high 3 Anderson, 1998;Heber et al, 2007;Jackson et al, 2007a) After processing in subduction zones, the crustal portion of the subducted plate hosts TITAN enrichment, and the asthenospheric DMM coupled to the bottom of the downgoing plate remains unscathed by subduction zone processes. The two components, TITAN-enriched eclogite and high 3 He/ 4 He asthenospheric peridotite, should be intimately associated as a "package" in space and time within a subducted plate, a geometry that is conducive to later mixing in the mantle.…”

Section: New Data and Observationsmentioning

confidence: 99%

“…Nonetheless, there is a growing consensus that this reservoir hosts a significant component of depleted mantle peridotite (e.g., Anderson, 1998;Heber et al, 2007). Recent work suggests that the high 3 He/ 4 He mantle may also host a component of recycled eclogite (Dixon et al, 2001;Brandon et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Dismantling the deep earth : geochemical constraints from hotspot lavas for the origin and lengthscales of mantle heterogeneity

Jackson¹

2008

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AcknowledgementsFirst off, I want to thank my advisor, Stan Hart, for being so generous, with his time, his resources, and his thoughts. Stan sent me to the edges of the earth to collect rocks on islands and by sea ("a happy student is a traveling student"). And the fishing trips didn't end when I got back to the lab. When I went to him for answers, I often just ended up with more questions, we'd dream up a dozen projects, and he'd send me off with more projects and questions (back in my office, I'd realize that the meeting didn't go as I'd planned)! But the questions were more important than the answers: the questions will keep me employed after I graduate! It's only now that I'm realizing that without so much independence to explore (though frightening at times), I may have never understood that I was capable of generating some fun ideas! I can't express my gratitude to Nobu Shimizu and Mark Kurz for their "open door" policy. They are always ready to give me time, sit down, and hash out new ideas. Their offices are idea factories. I don't know how I would have written this thesis without their constant input.My deepest appreciation to J. Collins for sweating it out with me in the field in Samoa, and to the rest of my committee, P. Kelemen, Erik Hauri and Fred Frey for their stimulating input and for traveling so far to attend the general exam, thesis defense, and committee meetings.J. Blusztajn has always been so optimistic and helpful, and has given me so much of his time and advice. J. Curtice and T. Atwood have also given me dollops of help, and without them I could not have accomplished much of the thesis work.I am so thankful for the friendship of my dear friends, S. Hoffmann, D. Stuebe and J. Blythe, Heidi Marcella, Carolyn Walker, Lauge Sokol-Hessner and Hannah Cole. They kept me going when the times were rough, and we shared many of the best times as well.I am also thankful for the friendship and advice that I received from the "old guard" of JP students, who left the WHOI "nest" before me.

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Assessment of relative Ti, Ta, and Nb (TITAN) enrichments in ocean island basalts

Peters

Day

2014

Geochem Geophys Geosyst

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The sensitivity of trace element concentrations to processes governing solid-melt interactions has made them valuable tools for tracing the effects of partial melting, fractional crystallization, metasomatism, and similar processes on the composition of a parental melt. Recent studies of ocean island basalts (OIB) have sought to correlate Ti, Ta, and Nb (TITAN) anomalies to isotopic tracers, such as 3 He/ 4 He and 187 Os/ 188 Os ratios, which may trace primordial deep mantle sources. A new compilation of global OIB trace element abundance data indicates that positive TITAN anomalies, though statistically pervasive features of OIB, may not be compositional features of their mantle sources. OIB show a range of Ti (Ti/Ti* 5 0.28-2.35), Ta (Ta/Ta* 5 0.11-93.4), and Nb (Nb/Nb* 5 0.13-17.8) anomalies that show negligible correlations with 3 He/ 4 He ratios, indicating that TITAN anomalies are not derived from the less-degassed mantle source traced by high-3 He/ 4 He. Positive TITAN anomalies can be modeled using variable degrees (0.1-10%) of nonmodal batch partial melting of garnet-spinel lherzolite at temperatures and pressures considered typical for OIB petrogenesis, and subjecting this partial melt to fractional crystallization and assimilation of mid-ocean ridge basalt-like crust (AFC). Correlations of TITAN anomalies with modal abundances of olivine and clinopyroxene in porphyritic Canary Islands lavas provide empirical support for this process and indicate that high abundances of these phases in OIB may create misleading trace element anomalies on primitive mantle-normalized spider diagrams. Because partial melting and AFC are common to all mantle-derived magmas, caution should be used when attributing TITAN anomalies to direct sampling of recycled or deep mantle sources by hotspots.

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Crystal–melt partitioning of noble gases (helium, neon, argon, krypton, and xenon) for olivine and clinopyroxene

Cited by 163 publications

References 60 publications

On the degassing state and the chemical structure of the Earth's interior inferred from noble gas isotopes-Past and recent views

On the degassing state and the chemical structure of the Earth's interior inferred from noble gas isotopes-Past and recent views

Dismantling the deep earth : geochemical constraints from hotspot lavas for the origin and lengthscales of mantle heterogeneity

Assessment of relative Ti, Ta, and Nb (TITAN) enrichments in ocean island basalts

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