On the Origin of Fe-Ca Metasomatism in Ultramafic-Hosted Hydrothermal Mineralized Systems: Insights from the Platta Nappe (Swiss Alps)

Coltat, Rémi; Patten, Clifford; Hochscheid, Flora; Branquet, Yannick; Ulrich, Marc; Boulvais, Philippe

doi:10.2139/ssrn.4480995

Cited by 1 publication

(3 citation statements)

References 53 publications

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“…This 300°-600°C temperature range overlaps the 425° ± 75°C stability range of ilvaite-hydroandradite-clinopyroxene-magnetite mineral assemblages estimated by thermodynamic modeling (Gustafson, 1974). According to Coltat et al (2023) we propose that Fe-Ca metasomatism results from fluid-rock interaction at temperatures between 350° and 600°C, high temperatures that inhibit serpentinization of olivine (Allen & Seyfried, 2003).…”

Section: High Temperature Hydrothermal Fluid Circulation Overprintsupporting

confidence: 55%

“…Most clinopyroxene has low TiO 2 , Na 2 O, Al 2 O 3 , and Cr 2 O 3 contents (Figures 7b and 7c), differing to the ones of mantle clinopyroxene of Site 920. Together with the low, even though variable, REE compositions of clinopyroxene (Figure S4 in Supporting Information S1), this points to a hydrothermal origin (Coltat et al, 2021(Coltat et al, , 2023.…”

Section: High Temperature Hydrothermal Fluid Circulation Overprintmentioning

confidence: 93%

“…This volumetric proportion may increase in other systems with more significant magmatic supply into pristine mantle lithosphere. Indeed, the extent of metal enrichment in mantle rocks seems to be linked to the size of magmatic intrusions (e.g., Cannat et al, 1997;Coltat et al, 2023;Niida, 1997). Hence, large magmatic intrusions in peridotite may be associated with important volumes of mantle rocks enriched in Fe, Co, and Zn.…”

Section: Present-day Setting Of Fe-ca Metasomatism and Implications F...mentioning

confidence: 99%

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Origin of Fe‐Ca‐Metasomatism in Exhumed Mantle Rocks at the MARK Area (23°N, ODP Leg 153) and Implications on the Formation of Ultramafic‐Hosted Seafloor Massive Sulfide Deposits

Coltat,

Andreani,

Patten

et al. 2023

Geochem Geophys Geosyst

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At Mid‐Ocean Ridges, hot, reduced, acidic, and metal‐rich fluids are responsible for the formation of ultramafic‐hosted seafloor massive sulfide deposits (UM‐SMSs), where mantle exhumation efficiently operates. As UM‐SMSs display great structural, mineralogical, and geochemical variabilities from site to site, a simple genetic model cannot be applied. Notably, fluid circulation and Fe‐Ca metasomatism are reported in ultramafic‐hosted hydrothermal deposits exposed in ophiolites, suggesting it might have genetic implications on the formation of mineralized systems. Similar Fe‐Ca metasomatism was reported in drilled mantle rocks at the Mid Atlantic Ridge Kane (MARK) area, offering access to the vertical dimension beneath an exhumed oceanic core complex to provide an integrative study of the nature and geometry of deep magmatic and hydrothermal processes. At MARK, mantle rocks underwent complex processes of melt‐rock and fluid‐rock interactions. Magma channeling and interactions with surrounding rocks enriched mantle silicates in Fe, Co, and Zn. There, subsequent hydrothermal alteration allowed to stabilize Fe‐rich silicates. Mineralogy and geochemistry of hydrothermal phases at MARK suggest mineral crystallization under temperatures from ∼830° down to 350°C during early mantle exhumation at a depth <6.5 km below seafloor, followed by serpentinization of the massif during progressive mantle denudation. Considering the lithological heterogeneity at (ultra)slow‐spreading ridges, metal enrichment in deep mantle rocks during melt‐rock interactions may be a widespread process. In ultramafic‐dominated environments where extensional tectonics allow fluid flows to these deep zones, fluids may leach and transport metals to the surface, accounting for metal entrapment in UM‐SMSs.

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Section: High Temperature Hydrothermal Fluid Circulation Overprintsupporting

confidence: 55%

Section: High Temperature Hydrothermal Fluid Circulation Overprintmentioning

confidence: 93%

Section: Present-day Setting Of Fe-ca Metasomatism and Implications F...mentioning

confidence: 99%

See 1 more Smart Citation

Origin of Fe‐Ca‐Metasomatism in Exhumed Mantle Rocks at the MARK Area (23°N, ODP Leg 153) and Implications on the Formation of Ultramafic‐Hosted Seafloor Massive Sulfide Deposits

Coltat,

Andreani,

Patten

et al. 2023

Geochem Geophys Geosyst

View full text Add to dashboard Cite

show abstract

On the Origin of Fe-Ca Metasomatism in Ultramafic-Hosted Hydrothermal Mineralized Systems: Insights from the Platta Nappe (Swiss Alps)

Cited by 1 publication

References 53 publications

Origin of Fe‐Ca‐Metasomatism in Exhumed Mantle Rocks at the MARK Area (23°N, ODP Leg 153) and Implications on the Formation of Ultramafic‐Hosted Seafloor Massive Sulfide Deposits

Origin of Fe‐Ca‐Metasomatism in Exhumed Mantle Rocks at the MARK Area (23°N, ODP Leg 153) and Implications on the Formation of Ultramafic‐Hosted Seafloor Massive Sulfide Deposits

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