Compositional variations in spinel-hosted pargasite inclusions in the olivine-rich rock from the oceanic crust–mantle boundary zone

Tamura, Akihiro; Morishita, Tomoaki; Ishimaru, Satoko; Hara, Kaori; Sanfilippo, Alessio; Arai, Shoji

doi:10.1007/s00410-016-1245-9

Cited by 21 publications

(9 citation statements)

References 48 publications

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“…The range for possible parental magmas to the Stillwater complex [61] is also shown. We note that the similar chromite-hosted hydrous silicate inclusions have been also found in dunites, troctolites and some harzburgites drilled from the East Pacific Rise and the Mid-Atlantic Ridge [62][63][64]. Those rocks were produced through reaction between mantle harzburgite and MORB magma [62][63][64].…”

Section: Chromite-hosted Polymineralic Inclusions: a Remarkable Similsupporting

confidence: 63%

“…We note that the similar chromite-hosted hydrous silicate inclusions have been also found in dunites, troctolites and some harzburgites drilled from the East Pacific Rise and the Mid-Atlantic Ridge [62][63][64]. Those rocks were produced through reaction between mantle harzburgite and MORB magma [62][63][64]. The abyssal podiform chromitite has been interpreted as one of the products of the same kind of MORB-harzburgite reaction [35,62,65].…”

Section: Chromite-hosted Polymineralic Inclusions: a Remarkable Similsupporting

confidence: 58%

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Genetic Link between Podiform Chromitites in the Mantle and Stratiform Chromitites in the Crust: A Hypothesis

Arai¹

2021

Minerals

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No genetic link between the two main types of chromitite, stratiform and podiform chromitites, has ever been discussed. These two types of chromitite have very different geological contexts; the stratiform one is a member of layered intrusions, representing fossil magma chambers, in the crust, and the podiform one forms pod-like bodies, representing fossil magma conduits, in the upper mantle. Chromite grains contain peculiar polymineralic inclusions derived from Na-bearing hydrous melts, whose features are so similar between the two types that they may form in a similar fashion. The origin of the chromite-hosted inclusions in chromitites has been controversial but left unclear. The chromite-hosted inclusions also characterize the products of the peridotite–melt reaction or melt-assisted partial melting, such as dunites, troctolites and even mantle harzburgites. I propose a common origin for the inclusion-bearing chromites, i.e., a reaction between the mantle peridotite and magma. Some of the chromite grains in the stratiform chromitite originally formed in the mantle through the peridotite–magma reaction, possibly as loose-packed young podiform chromitites, and were subsequently disintegrated and transported to a crustal magma chamber as suspended grains. It is noted, however, that the podiform chromitites left in the mantle beneath the layered intrusions are different from most of the podiform chromitites now exposed in the ophiolites.

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Section: Chromite-hosted Polymineralic Inclusions: a Remarkable Similsupporting

confidence: 63%

Section: Chromite-hosted Polymineralic Inclusions: a Remarkable Similsupporting

confidence: 58%

Genetic Link between Podiform Chromitites in the Mantle and Stratiform Chromitites in the Crust: A Hypothesis

Arai¹

2021

Minerals

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“…Furthermore, extensive reaction between interstitial liquid and host may also occur when chemically evolved melts migrate upwards, driven by buoyancy, compaction, deformation, or a combination thereof (Natland and Dick, 2001;Lissenberg et al, 2013Lissenberg et al, , 2019. The equilibration between minerals and migrating melts leads to changes in mineral and melt chemistry at the reaction front, and these reactive melts crystallize new phases around partly resorbed pre-existing minerals, ultimately modifying or even completely replacing the original crystal matrix (Coogan et al, 2000;Lissenberg and Dick, 2008;Suhr et al, 2008;Drouin et al, 2009;Drouin et al, 2010;Sanfilippo et al, 2015;Tamura et al, 2016Ferrando et al, 2018. Whether leading to partial melting of the host rocks or selective dissolution of a crystal matrix, the assimilation of crustal material in the ascending magmas may be sufficiently efficient (Kvassnes and Grove, 2008;Yang et al, 2019) to potentially control the majorand trace element budgets of the melts erupted at the surface (e.g., Lissenberg and Dick, 2008;Lissenberg and MacLeod, 2016;Sanfilippo et al, 2016;Jackson et al, 2018;Renna et al, 2018;Lissenberg et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Early-Stage Melt-Rock Reaction in a Cooling Crystal Mush Beneath a Slow-Spreading Mid-Ocean Ridge (IODP Hole U1473A, Atlantis Bank, Southwest Indian Ridge)

et al. 2020

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“…The presence of hydrous silicate inclusions in chromite is possibly not related to concentration of chromite for chromitite. The chromite-hosted silicate inclusions, which represent trapped melt rich in water and Na, are also commonly found in dunites, troctolites, and related rocks from the current ocean floor [51][52][53], in addition to chromitites [51,54,55]. The formation of troctolites and dunites from mantle harzburgite is closely associated with dissolution of mantle orthopyroxene via reaction with an invading magma [51,56].…”

Section: Role Of H2o In the Podiform Chromitite Formationmentioning

confidence: 99%

Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis

Arai

Miura²,

Tamura

et al. 2020

Minerals

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The role of water-rich solutions in the formation of chromitites has been the matter of controversy. We found small chromite concentrations (chromitites) in diopsidites, precipitated from high-temperature hydrothermal fluids, in the mantle to the crust of the Oman ophiolite. Here, we present petrologic characteristics of the hydrothermal chromitites to understand their genesis. In the chromitites, the chromite is associated with uvarovite in the crust and diopside + grossular in the mantle. They are discriminated from the magmatic podiform chromitite by dominance of the Ca-Al silicates in the matrix. The fluids responsible for chromite precipitation are possibly saline, being derived from the seawater circulated into the mantle through the crust. The saline fluids precipitate chromite to form chromite upon decompression and cooling, and transport platinum-group elements (especially Pt and Pd). The fluids obtain Ca and Al from the crustal rocks and Cr from the mantle rocks during circulation. Saline fluids are also supplied from the slab to the mantle wedge, and can metasomatically precipitate chromite and pyroxenes within peridotites. They re-distribute Cr and chromite in peridotites along with circulation of saline fluids in the mantle wedge.

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Compositional variations in spinel-hosted pargasite inclusions in the olivine-rich rock from the oceanic crust–mantle boundary zone

Cited by 21 publications

References 48 publications

Genetic Link between Podiform Chromitites in the Mantle and Stratiform Chromitites in the Crust: A Hypothesis

Genetic Link between Podiform Chromitites in the Mantle and Stratiform Chromitites in the Crust: A Hypothesis

Early-Stage Melt-Rock Reaction in a Cooling Crystal Mush Beneath a Slow-Spreading Mid-Ocean Ridge (IODP Hole U1473A, Atlantis Bank, Southwest Indian Ridge)

Hydrothermal Chromitites from the Oman Ophiolite: The Role of Water in Chromitite Genesis

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