Xenon isotopes in the MORB source, not distinctive of early global degassing

2015 ◽  
Vol 42 (11) ◽  
pp. 4367-4374 ◽  
Author(s):  
P. Boehnke ◽  
M. W. Caffee ◽  
T. M. Harrison
Keyword(s):  
Morb Source ◽  
Xenon Isotopes

Assessment of a compton-suppressed spectrometer for measurement of radioactive xenon isotopes

2021 ◽  
Vol 172 ◽  
pp. 109669
Author(s):  
Yuanqing Fan ◽  
Qi Li ◽  
Ying Wang ◽  
Yungang Zhao ◽  
Xinjun Zhang ◽  
...  
Keyword(s):  
Xenon Isotopes ◽  
Radioactive Xenon

U-depleted versus U-enriched signatures in complementary crust-mantle sources of volcanic rocks from Asia

2021 ◽  
Author(s):  
Sergei Rasskazov ◽  
Irina Chuvashova ◽  
Tatiana Yasnygina ◽  
Elena Saranina
Keyword(s):  
Lower Mantle ◽  
Partition Coefficients ◽  
Volcanic Rocks ◽  
Anomalous Behavior ◽  
Water Soluble ◽  
Tien Shan ◽  
Mantle Sources ◽  
Continental Lower Crust ◽  
Morb Source ◽  
Transitional Processes

<p>The Nb/U~47 and Th/U~4 ratios are considered as indicative for the OIB source referred by some authors to lower mantle plumes that in fact have no specific geochemical signatures but HIMU component. The Th/U ratio may vary because of the different garnet–melt and/or clinopyroxene–melt partition coefficients of U and Th. Anomalously high or low Th/U values in rocks can also be related to the input or removal of U, the migration of which is controlled by its mobility under oxidizing conditions owing to the formation of water-soluble uranyl  compounds with hexavalent U. These variations definitely distinguish non-plume magmatic sources. The Th/U ratio decreases to 2.5 in the MORB source and increases to 6 in the continental lower crust one. We describe anomalous behavior of uranium in sources of Cenozoic basalts and basaltic andesites from Primorye, Lesser Khingan, Tunka Valley, as well as similar Cretaceous-Paleogene rocks from Tien Shan. Significant deviations of the Th/U and Nb/U ratios from the OIB values are characteristics mostly of garnet-free sources. The U-depleted and U-enriched signatures are used as sensitive indicators for deciphering crust–mantle transitional processes.</p><p>This work is supported by the RSF grant 18-77-10027.</p>

Xenon isotopes in size separated nanodiamonds from Efremovka: 129Xe*, Xe-P3, and Xe-P6

2005 ◽  
Vol 69 (16) ◽  
pp. 4133-4148 ◽  
Author(s):  
J.D. Gilmour ◽  
A.B. Verchovsky ◽  
A.V. Fisenko ◽  
G. Holland ◽  
G. Turner
Keyword(s):  
Xenon Isotopes

Relative yield of xenon isotopes in neutron fission of Pu239 and U233

1972 ◽  
Vol 33 (2) ◽  
pp. 826-827 ◽  
Author(s):  
K. A. Petrzhak ◽  
M. G. Pan'yan ◽  
V. F. Teplykh ◽  
M. Ya. Kondrat'ko
Keyword(s):  
Relative Yield ◽  
Neutron Fission ◽  
Xenon Isotopes

Potential impact of releases from a new Molybdenum-99 production facility on regional measurements of airborne xenon isotopes

2014 ◽  
Vol 129 ◽  
pp. 43-47 ◽  
Author(s):  
T.W. Bowyer ◽  
P.W. Eslinger ◽  
I.M. Cameron ◽  
J.I. Friese ◽  
J.C. Hayes ◽  
...  
Keyword(s):  
Production Facility ◽  
Xenon Isotopes ◽  
Potential Impact

Relative yields of xenon isotopes in the photofission of237Np and235U

1976 ◽  
Vol 41 (1) ◽  
pp. 654-654 ◽  
Author(s):  
K. A. Petrzhak ◽  
E. V. Platygina ◽  
Yu. A. Solov'ev ◽  
V. F. Teplykh
Keyword(s):  
Xenon Isotopes

scholarly journals Identification of chondritic krypton and xenon in Yellowstone gases and the timing of terrestrial volatile accretion

2020 ◽  
Vol 117 (25) ◽  
pp. 13997-14004 ◽  
Author(s):  
Michael W. Broadley ◽  
Peter H. Barry ◽  
David V. Bekaert ◽  
David J. Byrne ◽  
Antonio Caracausi ◽  
...  
Keyword(s):  
Mantle Plume ◽  
Noble Gases ◽  
Noble Gas ◽  
Mid Ocean Ridge ◽  
Mantle Sources ◽  
Source Mantle ◽  
Morb Source ◽  
Protosolar Nebula ◽  
Ocean Ridge ◽  
Yellowstone Caldera

Identifying the origin of noble gases in Earth’s mantle can provide crucial constraints on the source and timing of volatile (C, N, H2O, noble gases, etc.) delivery to Earth. It remains unclear whether the early Earth was able to directly capture and retain volatiles throughout accretion or whether it accreted anhydrously and subsequently acquired volatiles through later additions of chondritic material. Here, we report high-precision noble gas isotopic data from volcanic gases emanating from, in and around, the Yellowstone caldera (Wyoming, United States). We show that the He and Ne isotopic and elemental signatures of the Yellowstone gas requires an input from an undegassed mantle plume. Coupled with the distinct ratio of129Xe to primordial Xe isotopes in Yellowstone compared with mid-ocean ridge basalt (MORB) samples, this confirms that the deep plume and shallow MORB mantles have remained distinct from one another for the majority of Earth’s history. Krypton and xenon isotopes in the Yellowstone mantle plume are found to be chondritic in origin, similar to the MORB source mantle. This is in contrast with the origin of neon in the mantle, which exhibits an isotopic dichotomy between solar plume and chondritic MORB mantle sources. The co-occurrence of solar and chondritic noble gases in the deep mantle is thought to reflect the heterogeneous nature of Earth’s volatile accretion during the lifetime of the protosolar nebula. It notably implies that the Earth was able to retain its chondritic volatiles since its earliest stages of accretion, and not only through late additions.

Sign in / Sign up

Export Citation Format

Share Document