Halogens and noble gases in Mathematician Ridge meta-gabbros, NE Pacific: implications for oceanic hydrothermal root zones and global volatile cycles

Kendrick, Mark A.; Honda, Masahiko; Vanko, David A.

doi:10.1007/s00410-015-1192-x

Cited by 35 publications

(51 citation statements)

References 102 publications

(182 reference statements)

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“…Errors are 1 σ . Data sources: MORB and OIB (Kendrick et al, ; Kendrick, Jackson, et al, , ; Kendrick et al, ), sedimentary pore fluids (Fehn et al, ; Kastner et al, ; Martin et al, ; Muramatsu et al, ), seawater (Bruland & Lohan, ), serpentinites from the oceanic lithosphere (John et al, ; Kendrick et al, ; Kendrick, Honda, et al, ), AOC (Chavrit et al, ; Kendrick, Honda, et al, ), and MORB source mantle (Burgess et al, ; Jambon et al, ; Kendrick et al, , ; Kendrick, Jackson, et al, , ; Saal et al, ; Salters & Stracke, ). The halogen ratios reported by Kendrick et al (, ) and Kendrick, Honda, et al () were recalculated using revised values for scapolite monitors (Kendrick, Arculus, et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…Urann et al () argued that a slab melt derived from the subducted Farallon plate was responsible for the relatively high F concentration in a Kilbourne Hole mantle xenolith. It is also possible that the low Br/Cl halogens, which are similar to AOC (Figure a; Chavrit et al, ; Kendrick, Honda, et al, ), were also derived from a slab melt. This process indicates that the low Br/Cl component is secondary.…”

Section: Discussionmentioning

confidence: 96%

“…Breakdown products in some samples attest to the former presence of amphibole (MF‐07‐2, MF‐07‐4, and DW‐07‐3; section ). Amphibole is known to have relatively high Cl concentration and low Br/Cl (and I/Cl) ratio (Chavrit et al, ; Kendrick, , Kendrick, Honda, et al, ; Kobayashi et al, ). If the halogens in amphibole are retained in its breakdown products, the low Br/Cl trend for the Eifel samples extending from MORB/OIB values can be explained by the former presence of amphibole in the peridotites.…”

Section: Discussionmentioning

confidence: 99%

“…Kendrick, Jackson, et al () accounted for the uniform and relatively low I/Cl ratio of the mantle by suggesting that addition of the hydrated oceanic lithospheric mantle with high I/Cl ratio is balanced either by subduction of Cl‐rich materials such as AOC (Chavrit et al, ; Kendrick, Honda, et al, ) or by the preferential loss of I from subducting slabs at relatively shallow depths (John et al, ; Kendrick et al, ; Pagé et al, ). However, there is support for I‐rich halogen subduction beneath and beyond sub‐arc depth.…”

Section: Discussionmentioning

confidence: 99%

“…Halogens and noble gases show highly contrasting concentrations between the surface and interior of the Earth, making them exceptionally sensitive indicators of subducted volatiles (e.g., Frezzotti & Ferrando, ; Hanley & Koga, ; Holland & Ballentine, ; Kendrick et al, ; Klemme & Stalder, ; Ozima & Podosek, ). Furthermore, these groups of elements show distinct elemental and/or isotopic compositions in different reservoirs, which can be used to reveal the origin and/or subduction path of volatiles (e.g., Broadley et al, ; Chavrit et al, ; Holland & Ballentine, ; John et al, ; Kendrick et al, , , ; Kendrick, Arculus, et al, ; Kendrick, Honda, et al, , ; Kendrick, Jackson, et al, , ; Kobayashi et al, ; Ozima & Podosek, ; Schilling et al, ; Sumino et al, ). Holland and Ballentine () showed that the elemental and isotopic compositions of nonradiogenic isotopes of heavy noble gases (Ar, Kr, and Xe) in the convecting mantle are similar to those of seawater together with a sedimentary component and argued that seawater‐sourced fluids are subducted into the convecting mantle.…”

Section: Introductionmentioning

confidence: 99%

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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

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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

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Halogens in Seawater, Marine Sediments and the Altered Oceanic Lithosphere

Kendrick

2018

Springer Geochemistry

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This chapter aims to provide a framework for understanding the distribution of halogens in the oceanic lithosphere. It reviews the concentration of F, Cl, Br and I in seawater, marine sediment pore waters, hydrothermal vent fluids, fluid inclusions from deeper in the crust, and the complementary solid-phase reservoirs of organic matter and minerals present in sediments and crustal rocks from varying depths. Seawater (3.4-3.5 wt. % salt) is depleted in F, weakly enriched in I and strongly enriched in Br and Cl compared to the primitive mantle. Sequestration of I and Br by phytoplankton lead to the storage of these elements in marine sediments which are the Earths dominant I reservoir. Regeneration of organic matter during diagenesis releases I and Br to marine sediment pore waters which can be advected into the underlying crust and lithosphere. In contrast, Cl is assumed to behave conservatively in pore waters and F is precipitated in sedimentary minerals meaning it is not significantly advected into the underlying basement. Vent fluids have salinities of 0.1-6 wt. % salts, which provide evidence for phase separation and segregation of vapours and brines in hydrothermal systems. The majority of vent fluids have Br/Cl ratios within 10% of the seawater value. However, elevated Br/Cl and I/Cl ratios indicate that some vent fluids interact with sediments, and depressed Br/Cl ratios suggest some vent fluids leach Cl from glassy volcanic rocks or halite. Vent fluids have F/Cl ratios scattered around the seawater value which reflects the generally low mobility of F during diagenesis and hydrothermal alteration. In comparison to vent fluids, fluid inclusions also provide evidence for phase separation but preserve a much greater range of salinity including brines with salinities as high as ~50 wt. % salt in many parts of the crust. The altered ocean crust has a F concentration of close to its initial value. In contrast, Cl is mobilised within layer 2 pillows and dykes and strongly enriched in layer 3 gabbros subjected to high temperature alteration. Amphibole is the dominant Cl host in the oceanic crust, with Cl concentrations of <500 ppm under greenschist conditions and up to wt. % levels under amphibolite conditions. The increasing Cl content of amphibole as a function of metamorphic grade most likely reflects a decreasing water/rock ratio and a general increase in fluid salinity as a function of depth in the crust. Amphibole preferentially incorporates Cl relative to Br and I; however, it is possible that I is enriched in absolute terms, and relative to Cl, in clay-rich alteration and biogenic alteration of glassy rocks in the upper crust. Serpentinites formed in the oceanic lithosphere can contain thousands of ppm Cl and some serpentinites preserve Br/Cl and I/Cl signatures very similar to sedimentary pore waters, indicating that all halogens have high compatibilities in serpentine. Fluorine is slightly enriched in serpentinites compared to peridotites which may indicate mobilisation of F from igneous lithologies in th...

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Halogens in serpentinised-troctolites from the Atlantis Massif: implications for alteration and global volatile cycling

Kendrick

Marks

Godard

2022

Contrib Mineral Petrol

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The concentrations of halogens in serpentinised olivine-rich lithologies in the lower oceanic crust (e.g. troctolites and wehrlites) and altered-gabbros, recovered from IODP Hole U1309D on the Atlantis Massif of the Mid-Atlantic Ridge, are contrasted. The aims were to evaluate if serpentinisation of lower crustal lithologies could significantly contribute to the volatile budget of oceanic lithosphere and test if serpentinites formed from seawater preserve seawater-like halogen signatures. The olivine-rich lithologies are variably serpentinised by lizardite with minor chrysotile. The maximum concentrations of halogens in the most strongly serpentinised samples are 70 µg/g F, 2,100 µg/g Cl, 9,800 ng/g Br and 8 ng/g I. In comparison, the maxima in interlayered gabbros are 200 µg/g F, 130 µg/g Cl, 400 ng/g Br and 9 ng/g I. The Br/Cl ratios of the altered gabbros are strongly influenced by the presence of amphibole, which preferentially incorporates the smaller halides. The serpentinised lithologies have low F/Cl ratios, due to their strong enrichment in seawater-derived Cl, and they have Br/Cl and I/Cl ratios intermediate of unaltered oceanic crust and seawater-derived fluids. Br/Cl and I/Cl ratios similar to seawater are best preserved in the most Cl-rich samples consistent with these ratios fingerprinting the fluid responsible for serpentinisation. Serpentinites formed from seawater in the lower ocean crust and lithosphere are likely to have low I/Cl ratios. Serpentinsed lithologies in the lower crust (and mantle lithosphere) could, therefore, significantly contribute to halogen subduction helping to explain the range of I/Cl ratios in arc lavas and a proposed decrease of mantle I/Cl over time.

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Halogens and noble gases in Mathematician Ridge meta-gabbros, NE Pacific: implications for oceanic hydrothermal root zones and global volatile cycles

Cited by 35 publications

References 102 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

Halogens in Seawater, Marine Sediments and the Altered Oceanic Lithosphere

Halogens in serpentinised-troctolites from the Atlantis Massif: implications for alteration and global volatile cycling

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