Distribution of fluorine in recent marine sediments related to petrographic composition: Bransfield Strait and northwestern Weddell Sea, Antarctica

Matthies, Dietmar; Troll, Georg

doi:10.1016/0025-3227(90)90052-l

Cited by 10 publications

(4 citation statements)

References 24 publications

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“…The relation of the degree of fluorine depletion with impactite type seems to indicate a connection with temperature history-the higher the temperature (and the longer the melt remains at the high temperature), the more F is released, while boron shows a less prominent depletion. Fluorine is thus easier volatilized than B, which is consistent with experience from pyrhydrolysis (Sauerer, 1986;Matthies and Troll, 1990). Water contents in Muong Nong type/splash-form tektites show a behavior that is very similar to F (Koeberl and Beran, 1988).…”

Section: Resultssupporting

confidence: 69%

Fluorine and boron geochemistry of tektites, impact glasses, and target rocks

Matthies

Koeberl

1991

Meteoritics

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Abstract— We have analyzed fluorine and boron in nine tektites from all four strewn fields, and in a suite of impact glasses and target rocks from the Zhamanshin and Darwin impact craters, as well as Libyan Desert Glass and Aouelloul impact glass samples. Fluorine and boron are useful indicators for the volatilization and temperature history of tektites and impact glasses. Tektites from different strewn fields show a limited range of F and B contents and have F/B ratios near unity. Most splash‐form tektites have lower average F and B contents than Muong Nong type tektites, which is similar to the relation between irghizites and zhamanshinites. The F and B contents in target rocks from the Zhamanshin and Darwin impact craters are similar to normal terrestrial sediments. Fluorine in impact glasses and tektites is more depleted compared to their (known or inferred) target rocks than is boron, which is caused by the higher volatility of F. The F/B ratios therefore decrease with increasing temperature of formation (suggesting that irghizites were formed at a higher temperature than zhamanshinites, and Muong Nong type tektites at a lower temperature than splash‐form tektites). Mixing of local country rocks together with partial loss of the volatiles F and B can reproduce the F and B contents of impact glasses.

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Section: Resultssupporting

confidence: 69%

Fluorine and boron geochemistry of tektites, impact glasses, and target rocks

Matthies

Koeberl

1991

Meteoritics

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“…Important F sinks in the oceanic environment include marine carbonates, phosphates, and alumina-silicate clay minerals (cf. Carpenter, 1969;Frohlich et al, 1983;Matthies and Troll, 1990;Rude and Aller, 1994). Calcite can contain hundreds of ppm of F (Fig 1).…”

Section: Fluorine's Low Solubilitymentioning

confidence: 99%

“…Fluorine also substitutes for the hydroxyl group in alumina-silicate clay minerals; however, the relative importance of this sink is disputed (cf. Carpenter, 1969;Matthies and Troll, 1990;Rude and Aller, 1994).…”

Section: Fluorine's Low Solubilitymentioning

confidence: 99%

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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“…Although formed entirely of volcanic rocks, the youngest of which have a K-Ar isotopic age of just 63 ka (with high errors (± 25 ka); González-Ferrán & Katsui 1970, Keller et al 1992, there are no primary volcanic landforms. However, Matthies et al (1988) identified a marine tephra layer in a sediment core from Bransfield Strait, which they matched compositionally with Bridgeman Island, although the analyses were not published. The age, location and depth of the tephra layer are unknown but, if verified, the presence of the tephra layer would confirm Holocene activity sourced on Bridgeman Island.…”

Section: Introductionmentioning

confidence: 99%

The 1821 eruption of Bridgeman Island, South Shetland Islands, Antarctica: an observed Capelinhos-style hydrovolcanic event

Smellie

Kraus²,

Williams

2023

Antarctic Science

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The first recorded volcanic eruption in Antarctica occurred on Bridgeman Island (South Shetland Islands) in early 1821, < 2 years after Antarctica was discovered. However, the observations were disputed owing to a lack of physical evidence. A consensus arose that they probably referred to Penguin Island, a young volcano with a well-formed volcanic cone situated just 60 km to the west. However, a recent re-examination of the historical reports demonstrated that the event was undoubtedly located at Bridgeman Island. Our new study demonstrates that the eruption was explosive and lasted throughout 1821. The vent was situated in the sea ~500 m to the west of Bridgeman Island and the eruption was hydrovolcanic (Surtseyan). The new volcano constructed a tuff ring composed of unconsolidated lapilli and ash, which rapidly coalesced with nearby Bridgeman Island, similar to how the Capelinhos volcano joined with neighbouring Faial (Azores) in 1957–1958. The tuff ring had a very low profile and was rapidly removed by marine erosion. However, fumarolic activity persisted for a few decades. Because the eruption is only 200 years old, the underlying volcanic construct (Bridgeman Rise) should be regarded as dormant rather than extinct.

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Distribution of fluorine in recent marine sediments related to petrographic composition: Bransfield Strait and northwestern Weddell Sea, Antarctica

Cited by 10 publications

References 24 publications

Fluorine and boron geochemistry of tektites, impact glasses, and target rocks

Fluorine and boron geochemistry of tektites, impact glasses, and target rocks

Halogens in Seawater, Marine Sediments and the Altered Oceanic Lithosphere

The 1821 eruption of Bridgeman Island, South Shetland Islands, Antarctica: an observed Capelinhos-style hydrovolcanic event

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