An Experimental Study on COH-bearing Peridotite up to 3·2 GPa and Implications for Crust–Mantle Recycling

Tumiati, Simone; Fumagalli, P.; Tiraboschi, Carla; Poli, Stefano

doi:10.1093/petrology/egs074

Cited by 102 publications

(95 citation statements)

References 102 publications

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“…8; Tumiati et al 2013, and references therein). Large amounts of carbonate and pelitic sediments from the Adriatic plate are transported and mixed along the subduction channel to the mantle wedge.…”

Section: The Roman Provincementioning

confidence: 99%

“…Mantle phase relations in a CO 2 -H 2 O-saturated K-doped peridotite have been recently experimentally determined by Tumiati et al (2013). The resulting model predicts metasomatic phase assemblages, and partial melting behaviour for phlogopite-and COH-bearing lherzolite, at redox conditions of wedge peridotites (see Malaspina et al 2010).…”

Section: Element Transfer In the Subduction Environmentmentioning

confidence: 99%

“…The large volumes of erupted magmas and the strong explosivity index of volcanism require wide sections of mantle melting and occurrence of high quantities of volatiles in the source, probably H 2 O and CO 2 . (Gerya & Meilick (2011), along with phase relations of CO 2 -H 2 O-saturated peridotite in the (Tumiati et al 2013). Redrawn from Tumiati et al (2013).…”

Section: The Roman Provincementioning

confidence: 99%

“…(Gerya & Meilick (2011), along with phase relations of CO 2 -H 2 O-saturated peridotite in the (Tumiati et al 2013). Redrawn from Tumiati et al (2013).…”

Section: The Roman Provincementioning

confidence: 99%

“…Very subordinate fractions of carbonate-rich melts can be generated if such a C-O-H-K-rich mantle wedge reaches temperatures only slightly above its solidus ( Fig. 8; Tumiati et al 2013). These low fractions of melts, being extremely reactive, are not supposed to reach the surface unless extremely violent eruptions occur (Frezzotti & Touret 2014).…”

Section: The Roman Provincementioning

confidence: 99%

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Magmatism, mantle evolution and geodynamics at the converging plate margins of Italy

Peccerillo

Frezzotti

2015

JGS

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Abstract:The Plio-Quaternary magmatism in the Tyrrhenian Sea area exhibits wide compositional variations, which cover almost entirely those observed for volcanic rocks worldwide. Some volcanoes (Etna, Iblei, Sardinia, etc.) range from tholeiitic to Na-alkaline, and display elemental and isotope signatures typical of FOZO and EM-1 ocean-island basalts (OIB). Other volcanoes (Aeolian Arc, Italian peninsula) range from calc-alkaline-shoshonitic to K-alkaline, exhibit typical 'subduction-related' trace element signatures (low Ta-Nb, high Rb-Cs-LREE), and show a large range of radiogenic isotope ratios, from mantle-like in the Aeolian Arc to crustal-like in central Italy. Geochemical data suggest that OIB-type magmatism originated in lithosphere-asthenosphere sources that were unaffected by recent subduction. In contrast, subduction-related magmas come from mantle sources that underwent Eocene to present mixing with various amounts and types of subducted crustal components. Fluxing of the mantle wedge by water-rich fluids from a mid-ocean ridge basalt-type slab occurred in the southern Tyrrhenian Sea, whereas interaction between peridotite and various types of sediments occurred in central Italy. These contrasting styles of mantle contaminations relate to the nature (oceanic or continental) of the foreland, slab geometry and pre-metasomatic mantle compositions, which vary greatly along the Apennine arc and are the reason for the formation of the wide variety of orogenic magmas in Italy.

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Section: The Roman Provincementioning

confidence: 99%

Section: Element Transfer In the Subduction Environmentmentioning

confidence: 99%

Section: The Roman Provincementioning

confidence: 99%

“…(Gerya & Meilick (2011), along with phase relations of CO 2 -H 2 O-saturated peridotite in the (Tumiati et al 2013). Redrawn from Tumiati et al (2013).…”

Section: The Roman Provincementioning

confidence: 99%

Section: The Roman Provincementioning

confidence: 99%

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Magmatism, mantle evolution and geodynamics at the converging plate margins of Italy

Peccerillo

Frezzotti

2015

JGS

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High Pressure Phase Relations of a Depleted Peridotite Fluxed by CO₂‐H₂O‐Bearing Siliceous Melts and the Origin of Mid‐Lithospheric Discontinuity

Saha

Dasgupta

Tsuno

2018

Geochem Geophys Geosyst

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We present phase equilibria experiments on a depleted peridotite (Mg# 92) fluxed with variable proportions of a slab‐derived rhyolitic melt (with 9.4 wt.% H2O, 5 wt.% CO2), envisaging an interaction that could occur during formation of continents by imbrication of slabs/accretion of subarc mantles. Experiments were performed with 5 wt.% (Bulk 2) and 10 wt.% (Bulk 1) melt at 950–1175°C and 2–4 GPa using a piston‐cylinder and a multi‐anvil apparatus, to test the hypothesis that volatile‐bearing mineral‐phases produced during craton formation can cause reduction in aggregate shear‐wave velocities (VS) at mid‐lithospheric depths beneath continents. In addition to the presence of olivine, orthopyroxene, clinopyroxene, and garnet/spinel, phlogopite (Bulk 1: 3–7.6 wt.%; Bulk 2: 2.6–5 wt.%) at 2–4 GPa, and amphibole (Bulk 1: 3–9 wt.%; Bulk 2: 2–6 wt.%) at 2–3 GPa (≤1050°C) are also present. Magnesite (Bulk 1: ∼1 wt.% and Bulk 2: ∼0.6 wt.%) is present at 2–4 GPa (<1000°C at 3 and < 1050°C at 4 GPa) and its thermal breakdown coincides with the visual appearance of trace‐melt. However, an extremely small fraction of melt is inferred at all experiments based on the knowledge of fluid‐saturated peridotite solidus and the difference between bulk H2O and total H2O stored in the hydrous phases. Calculated mineral end‐member volume‐proportions were used to calculate VS of the resulting assemblage at experimental conditions and along representative continental geotherms (surface heat flow of 40–50 mWm−2). We note that reactive crystallization of phlogopite ± amphibole by infiltration of 3–10% slab‐derived hydrous‐silicic melt can cause up to 6% reduction in VS and that the estimated reduction in VS increases with increasing melt:rock ratio. The presence of phlogopite limits amphibole‐stability, making phlogopite a more likely candidate for MLDs at >100 km depth.

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Redox Variables and Mechanisms in Subduction Magmatism and Volcanism

Evans

Tomkins

2021

Magma Redox Geochemistry

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An Experimental Study on COH-bearing Peridotite up to 3·2 GPa and Implications for Crust–Mantle Recycling

Cited by 102 publications

References 102 publications

Magmatism, mantle evolution and geodynamics at the converging plate margins of Italy

Magmatism, mantle evolution and geodynamics at the converging plate margins of Italy

High Pressure Phase Relations of a Depleted Peridotite Fluxed by CO₂‐H₂O‐Bearing Siliceous Melts and the Origin of Mid‐Lithospheric Discontinuity

Redox Variables and Mechanisms in Subduction Magmatism and Volcanism

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An Experimental Study on COH-bearing Peridotite up to 3·2 GPa and Implications for Crust–Mantle Recycling

Cited by 102 publications

References 102 publications

Magmatism, mantle evolution and geodynamics at the converging plate margins of Italy

Magmatism, mantle evolution and geodynamics at the converging plate margins of Italy

High Pressure Phase Relations of a Depleted Peridotite Fluxed by CO2‐H2O‐Bearing Siliceous Melts and the Origin of Mid‐Lithospheric Discontinuity

Redox Variables and Mechanisms in Subduction Magmatism and Volcanism

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High Pressure Phase Relations of a Depleted Peridotite Fluxed by CO₂‐H₂O‐Bearing Siliceous Melts and the Origin of Mid‐Lithospheric Discontinuity