The helium flux from the continents and ubiquity of low-3He/4He recycled crust and lithosphere

Day, James M.D.; Barry, Peter H.; Hilton, David R.; Burgess, R.; Pearson, D.G.; Taylor, L. A.

doi:10.1016/j.gca.2015.01.008

Cited by 84 publications

(46 citation statements)

References 98 publications

(195 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These values are consistent with those of previous studies on Eifel and other mantle xenoliths from the European SCLM (Buikin et al, ; Dunai & Baur, ; Gautheron et al, ). The 3 He/ 4 He ratios of Kilbourne Hole samples (7.92–8.10 Ra) are slightly lower than 9.08 ± 0.09 Ra reported previously for a mantle xenolith from same locality (Day et al, ). However, these values are within the range of the MORB source mantle (8 ± 1 Ra; Moreira & Kurz, ).…”

Section: Resultscontrasting

confidence: 56%

“…Errors are 1 σ . Data sources: He and Ar of Hualalai#2 (Fischer et al, ), Eifel (B05,G05) (Buikin et al, ; Gautheron et al, ), Kilbourne Hole and San Carlos (D15) (Day et al, ), MORB source mantle (Moreira & Kurz, ), European SCLM (Gautheron et al, ), air and seawater at 0 °C (Ozima & Podosek, ), and convecting mantle (Holland & Ballentine, ). SCLM = subcontinental lithospheric mantle; MORB = mid‐ocean ridge basalt.…”

Section: Resultsmentioning

confidence: 99%

“…However, the relatively high F concentration in Kilbourne Hole is considered to be a consequence of interaction with hydrous slab melts from the subducted Farallon plate (>20 ppm of F; Urann et al, ). Helium isotopic ratios were reported to be MORB‐like (8 ± 1 Ra, where 1 Ra = atmospheric ratio of 1.399 × 10 −6 ; Moreira & Kurz, ; Ozima & Podosek, ) for mantle xenoliths from San Carlos and Kilbourne Hole (Day et al, ). Meisel et al () reported Re depletion model ages of the European and southwestern United States SCLM of 1.62 and 1.55 Ga, respectively.…”

Section: Samplesmentioning

confidence: 99%

See 2 more Smart Citations

Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths

Kobayashi

Sumino

Burgess

et al. 2019

Geochem Geophys Geosyst

Self Cite

View full text Add to dashboard Cite

We present halogen, noble gas, and major and trace element compositions of mantle xenoliths from intraplate settings (Eifel, Kilbourne Hole, San Carlos, and Hawaii). The xenoliths show a wide range of halogen elemental ratios, which form two arrays centered on the halogen composition of mid-ocean ridge basalts. The samples on the array toward high I/Cl value have relatively low Cl concentration and low ratios of highly incompatible elements relative to heavy rare earth elements, whereas the samples on the array toward low Br/Cl value have higher Cl concentration and trace elements ratios. The detailed mechanisms to account for these signatures are equivocal at present. However, they are most likely to be related to secondary processes of volatile loss during partial melting and secondary phase formation during interaction with melts. The common primary mid-ocean ridge basalt-like halogen ratios in mantle xenoliths from different parts of the globe indicate that the mantle itself must have a relatively uniform composition over a wide scale. The mantle has maintained its halogen composition over billion year timescales without being affected by I-rich halogens being transported into the mantle. Mass balance calculations suggest that, in order to maintain the I/Cl ratio of the convecting mantle over 2 Gyr, the I/Cl ratio of the subducted halogens must be no more than several times higher than the present-day mantle value. Plain Language Summary Elemental and isotopic compositions of volatile species such ashalogens, noble gases, hydrogen, and carbon can be used to trace the evolution of these species in the Earth. Halogens are important tracers of subduction recycling of surface volatiles into the mantle: however, there is only limited understanding of halogens in the mantle. Here we provide new halogen data of mantle xenoliths from intraplate settings. The mantle xenoliths show a wide range of halogen elemental ratios, which are expected to be related to later processes after the xenoliths formed. A similar primary halogen component is present in the xenoliths sampled from different localities. This suggests that the mantle has the uniform halogen composition over a wide scale. The halogen composition in the convecting mantle is expected to have remained constant over more than 2 billion years, despite subduction of iodine-rich halogens. We used mass balance calculations to gain understanding into evolution rate of I/Cl ratio in the mantle. Calculations suggest that, in order to maintain the I/Cl ratio of the mantle over 2 Gyr, the I/Cl ratio of the subducted halogens must be no more than several times higher than the present-day mantle value.

show abstract

Section: Resultscontrasting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Samplesmentioning

confidence: 99%

See 1 more Smart Citation

Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths

Kobayashi

Sumino

Burgess

et al. 2019

Geochem Geophys Geosyst

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, reticular helium is normally released via rock/mineral melting or multistep crushing, while we used single-step crushing, which is a conservative method in order to minimize the release of helium from the crystal matrix (e.g., Correale et al, 2016;Kurz, 1986;Rizzo et al, 2018). However, other studies that used our approach found that in a sufficient time span a certain percentage of helium might diffuse from the crystal matrix into the FIs Day et al, 2015). Nucleogenic 3 He originates from the reaction of 6 Li (n, α) → 3 H (β) + 3 He produced by thermalized neutrons from (α, n) reactions within the rocks (e.g., Andrews & Kay, 1982;Lal, 1987).…”

Section: Entrapment Of Cosmogenic Nucleogenic and Radiogenic Heliummentioning

confidence: 99%

Geochemistry of Fluid Inclusions in Travertines From Western and Northern Turkey: Inferences on the Role of Active Faults in Fluids Circulation

Rizzo

Uysal

Mutlu

et al. 2019

Geochem Geophys Geosyst

View full text Add to dashboard Cite

The understanding of the relationship between the geochemistry of fluids circulating during travertine deposition and the presence of active faults is crucial for evaluating the seismogenetic potential of an area. Here we investigate travertines from Pamukkale and Reşadiye (Turkey), sited in seismic regions and next to thermal springs. These travertines formed ~24,500–50,000 (Pamukkale) and ~240–14,600 years (Reşadiye) BP. We characterize fluid inclusions (FIs) and studied concentration of H2O, CO2, O2 + N2, and 3He, 4He, 20Ne, and 40Ar, and bulk composition (trace elements and δ13C‐δ18O). FIs from both localities are mainly primary with low salinity and homogenization temperature around 136–140 °C. H2O is the major component followed by CO2, with the highest gas content measured in Pamukkale travertines. Concentrations of Ne‐Ar together with O2 + N2 indicate that travertines from both areas precipitated from atmosphere‐derived fluids. The 3He/4He is 0.5–1.3 Ra in Pamukkale and 0.9–4.4 Ra in Reşadiye. Samples with R/Ra > 1 are modified by cosmogenic 3He addition during exposure to cosmic rays. Excluding these data, FIs of Reşadiye are mostly atmosphere‐derived. This implies a shallow formation where the circulation was dominated by meteoric waters, which is consistent with their young age. Instead, FIs of Pamukkale show mixing of mantle‐, crustal‐, and atmosphere‐derived He, indicating that these travertines formed in lithospheric fractures. Based on the δ13CCO2 and δ18O of bulk rocks, we infer that travertines formed involving crustal‐ (mechanochemical rather than organic) and mantle‐derived CO2. Trace elements of Pamukkale and Reşadiye show comparable rare earth element patterns. We conclude that travertines formed in response of seismogenetic activity.

show abstract

“…This means they can record the original source of the geological fluids. The isotopic compositions of noble gases, such as He and Ar, have been used by many investigators to provide insights into fluid processes (Turner & Stuart, ; Stuart et al ., , ; Hu et al ., , , , , ; Burnard et al ., ; Mao et al ., ; Moura et al ., ; Day et al ., ; Zhu & Peng, ). In this study, we present the results of a systematic investigation of geology, fluid inclusions, and isotope geochemistry to determine whether mantle‐derived fluids were involved in the ore‐forming process.…”

Section: Introductionmentioning

confidence: 97%

Noble Gas and Stable Isotopic Constraints on the Origin of the Ag–Cu Polymetallic Ore Deposits in the Baiyangping Area, Yunnan Province, SW China

Zou

et al. 2016

Resource Geology

View full text Add to dashboard Cite

The Lanping basin, Yunnan province, SW China, is located at the juncture of the Eurasian and Indian Plates in the eastern part of the Tibetan Plateau. The Lanping basin, in the Sanjiang Tethyan metallogenic province, is a significant Cu-Ag-Zn-Pb mineralized belt in China that includes the largest sandstone-hosted Zn-Pb deposit in the world, the Jinding deposit, as well as several Ag-Cu deposits (the Baiyangping and Jinman deposits). These deposits, with total reserves of over 16.0 Mt Pb + Zn, 0.6 Mt Cu, and 7,000 t Ag, are mainly hosted in Meso-Cenozoic clastic rocks and are dominantly controlled by two Cenozoic thrust systems developed in the western and eastern segments of the basin. The Baiyangping, Babaoshan, and Hetaoqing ore deposits are representative of the epithermal base metal deposits in the Lanping basin. The microthermometric data show that the ore-forming fluids for these deposits were low temperature (110-180°C) and had bimodal distribution of salinity at moderate and mid to high salinities (approximately 2-8 wt.% and 18-26 wt.% NaCl equivalent). The C and O isotope data indicate that the ore-forming fluids were related to hot basin brines. We present new He and Ar isotope data on volatiles released from fluid inclusions contained in sulfides and in barite in these three deposits. 3 He/ 4 He ratios of the ore-forming fluids are 0.01 to 0.14 R/Ra with a mean of 0.07 Ra (where R is the 3 He/ 4 He ratio and Ra is the ratio for atmospheric helium). This mean value is intermediate to typical 3 He/ 4 He ratios for the crust (R/Ra = 0.01 to 0.05) and the ratio for air-saturated water (R/Ra = 1). The mean ratio is also significantly lower than the ratios found for mantle-derived fluids (R/Ra = 6 to 9). The 40 Ar/ 36 Ar ratios of the ore-forming fluids range from 298 to 382 with a mean of 323. This value is slightly higher than that for the air-saturated water (295.5). The 3 He/ 4 He ratios of fluids from the fluid inclusions imply that the ore-forming fluid for the Baiyangping, Babaoshan, and Hetaoqing deposits was derived from the crust and that any mantle-derived He was negligible. The content of the radiogenic Ar ranges between 0.2 to 20.4%, and the proportion of air-derived 40 Ar averages 94.1%. This indicates that atmospheric Ar was important in the formation of these deposits but that some radiogenic 40 Ar was derived from crustal rocks. Based on these observations coupled with other geochemical evidence, we suggest that the ore-forming fluids responsible for the formation of the Ag-Cu-Pb-Zn polymetallic ore deposits in the Baiyangping area of the Lanping basin were mainly derived from crustal fluids. The fluids may have mixed with some amount of air-saturated water, but there was no significant involvement of mantle-derived fluids.

show abstract

The helium flux from the continents and ubiquity of low-3He/4He recycled crust and lithosphere

Cited by 84 publications

References 98 publications

Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths

Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths

Geochemistry of Fluid Inclusions in Travertines From Western and Northern Turkey: Inferences on the Role of Active Faults in Fluids Circulation

Noble Gas and Stable Isotopic Constraints on the Origin of the Ag–Cu Polymetallic Ore Deposits in the Baiyangping Area, Yunnan Province, SW China

Contact Info

Product

Resources

About