Effects of fluid influx, fluid viscosity, and fluid density on fluid migration in the mantle wedge and their implications for hydrous melting

Cerpa, Nestor G.; Wada, Ikuko; Wilson, C. R.

doi:10.1130/ges01660.1

Cited by 24 publications

(22 citation statements)

References 90 publications

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“…It is under this assumption that the up‐slab flows in Figure are necessary to produce the melt feeding arc volcanism. However, two‐phase geodynamic models of the mantle wedge suggest that the melt and fluid transport through the wedge is more complex than simply vertical, and depends on many factors including solid rheology and grain size in the wedge (Cerpa et al, , ; Wilson et al, ). In addition, the coincidence of flux peaks and the projected volcanic arc position in Figures and is premised on the hot thermal structure of the 10 Ma slab.…”

Section: Discussionmentioning

confidence: 99%

Devolatilization of Subducting Slabs, Part II: Volatile Fluxes and Storage

Tian

Katz

Jones

et al. 2019

Geochem Geophys Geosyst

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Subduction is a crucial part of the long-term water and carbon cycling between Earth's exosphere and interior. However, there is broad disagreement over how much water and carbon is liberated from subducting slabs to the mantle wedge and transported to island-arc volcanoes. In the Tian et al. (2019) Part I, we parameterize the metamorphic reactions involving H 2 O and CO 2 for representative subducting lithologies. On this basis, a two-dimensional reactive transport model is constructed in this Part II. We assess the various controlling factors of CO 2 and H 2 O release from subducting slabs. Model results show that up-slab fluid flow directions produce a flux peak of CO 2 and H 2 O at subarc depths. Moreover, infiltration of H 2 O-rich fluids sourced from hydrated slab mantle enhances decarbonation or carbonation at lithological interfaces, increases slab surface fluxes, and redistributes CO 2 from basalt and gabbro layers to the overlying sedimentary layer. As a result, removal of the cap sediments (by diapirism or off-scraping) leads to elevated slab surface CO 2 and H 2 O fluxes. The modeled subduction efficiency (the percentage of initially subducted volatiles retained until ∼200 km deep) of H 2 O and CO 2 is increased by open-system effects due to fractionation within the interior of lithological layers.

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Section: Discussionmentioning

confidence: 99%

Devolatilization of Subducting Slabs, Part II: Volatile Fluxes and Storage

Tian

Katz

Jones

et al. 2019

Geochem Geophys Geosyst

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“…At shallow depths, the low permeability due to the small grain size at the base of the mantle wedge causes trapped aqueous fluid to be entrained toward the sub‐arc mantle, where the enlarged grain size leads to a relatively high permeability (Cerpa et al, 2017). The temperature‐dependent viscosity of the aqueous fluid results in a similar effect of the grain size evolution; high‐viscosity aqueous fluid is trapped at the base of the mantle wedge and dragged into the sub‐arc mantle (Cerpa et al, 2018). The effect of dynamic pressure on aqueous fluid flow may be minor for the low viscosity of the mantle wedge (Cerpa et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…The temperature‐dependent viscosity of the aqueous fluid results in a similar effect of the grain size evolution; high‐viscosity aqueous fluid is trapped at the base of the mantle wedge and dragged into the sub‐arc mantle (Cerpa et al, 2018). The effect of dynamic pressure on aqueous fluid flow may be minor for the low viscosity of the mantle wedge (Cerpa et al, 2018). Wilson et al (2014) showed that the compaction pressure deflects aqueous fluid in the back‐arc mantle toward the sub‐arc mantle.…”

Section: Discussionmentioning

confidence: 99%

“…Adopting a small‐porosity assumption (porosity << 1) for the aqueous fluid, we neglect the effect of aqueous fluid on the behavior of a solid (e.g., Cerpa et al, 2018). Hence, a deforming solid can be considered a very viscous fluid whose behavior is approximated by the Stokes equations (e.g., Lee & Wada, 2017; Ryu & Lee, 2017):

0 = \nabla \cdot {\overset{⃑}{V}}_{s}, ((), continuity equation)

0 = - \nabla P + \nabla \cdot ((), 2 η \overset{ε}{true}), ((), momentum equation)

where

{\overset{⃑}{V}}_{s}

is the solid velocity (m s −1 ), P is the dynamic pressure (Pa), η is the shear viscosity (Pa s), and

\overset{ε}{true}

is the strain rate tensor (s −1 ).…”

Section: Methodsmentioning

confidence: 99%

“…Adopting a small-porosity assumption (porosity << 1) for the aqueous fluid, we neglect the effect of aqueous fluid on the behavior of a solid (e.g., Cerpa et al, 2018). Hence, a deforming solid can be considered a very viscous fluid whose behavior is approximated by the Stokes equations (e.g., Lee & Wada, 2017;Ryu & Lee, 2017):…”

Section: Governing Equationsmentioning

confidence: 99%

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Correlation of Quaternary Volcano Clusters With Partial Melting of Mantle Wedge, Northeast Japan: A Numerical Model Study

Yoo

Lee

2020

Geophysical Research Letters

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The Quaternary volcano clusters in Northeast Japan and the no-volcano zones between them imply extensive and scarce melting, respectively, in the mantle wedge, but no quantitative study on the heterogeneous melting has been conducted. Here, we constructed two-dimensional numerical models by considering along-arc temperature variations in the mantle wedge expressed as high-(hot fingers) and low-temperature anomalies (deterred corner flow) with the slab dehydration, porous flow of aqueous fluid, and partial melting of the mantle wedge. The results show that the high-and low-temperature anomalies in the mantle wedge result in extensive and negligible melting beneath the volcano clusters and no-volcano zones, respectively, consistent with geochemical and geophysical estimations. Contrary to the near-complete slab dehydration beneath the volcano clusters, the partially dehydrated subducting slab beneath the no-volcano zones transports the remaining water into the mantle transition zone, which has implications for intraplate volcanoes in Northeast Asia. Plain Language SummaryThe Quaternary volcanoes in Northeast Japan are expressed as 11 volcano groups and are thought to be correlated with localized and extensive partial melting in the mantle wedge beneath these groups. However, scarce melting is expected in the mantle wedge beneath the no-volcano zones between those volcano groups. Because no quantitative study on partial melting in the mantle wedge has been conducted, we carried out two-dimensional numerical modeling by considering the high-and low-temperature anomalies in the mantle wedge beneath Northeast Japan and evaluated the slab dehydration and melting therein. Our results show extensive melting beneath the volcano groups but negligible melting beneath the no-volcano zones; localized high mantle temperatures result in the formation of the volcano groups. The remaining water stored in the hydrous minerals in the subducting slab beneath the no-volcano zones is transported into the mantle transition zone, which has implications for intraplate volcanoes in Northeast Asia.

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Thrust Shear Sense and Shear Zone Fabrics in the Higher Himalaya, Siyom Valley, Eastern Arunachal Himalaya, India

Goswami

Baruah²,

Mahanta

et al. 2020

Journal of the Geological Society of India

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The Higher Himalayan Crystallines (HHC) in the Siyom river section of eastern Arunachal Himalaya, display top-to- ESE compressional ductile shear from Pene to Menchuka. In this part of the Himalayan Metamorphic Belt (HMB), the base of the Main Central Thrust (MCT) is the southern boundary of the ductile shear fabrics in HHC. Across the MCT, a significant break in the grade of metamorphism is observed between the HHC and the Lesser Himalayan Sequences (LHS). The ductile shear fabrics documented in the HHC are primary S-C and S-C′ fabrics, asymmetric folds, porphyroclasts and porphyrobalsts, brittle- ductile structures and asymmetric boudins. Three phases of folding representing three deformation episodes (D1-D3) in HHC are recorded in the area. The rocks of the HHC in Siyom valley are completely transposed by the D2 deformation into NNW dipping C- plane. Ductile shear represented by grain scale structures include sigmoidal foliation, rotation of the inclusion trails in garnet porphyroblasts, asymmetric folds with consistent top-to-ESE sense of shear. The ductile to brittle-ductile shear fabrics in the area indicate that the thrust sense of shear in the HHC is consistent without any shear sense reversal from Pene to Menchuka. These compressional shear fabrics provide invaluable field evidences for constraining the evolution of this part of the Higher Himalaya.

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Effects of fluid influx, fluid viscosity, and fluid density on fluid migration in the mantle wedge and their implications for hydrous melting

Cited by 24 publications

References 90 publications

Devolatilization of Subducting Slabs, Part II: Volatile Fluxes and Storage

Devolatilization of Subducting Slabs, Part II: Volatile Fluxes and Storage

Correlation of Quaternary Volcano Clusters With Partial Melting of Mantle Wedge, Northeast Japan: A Numerical Model Study

Thrust Shear Sense and Shear Zone Fabrics in the Higher Himalaya, Siyom Valley, Eastern Arunachal Himalaya, India

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