Water in garnet pyroxenite from the Sulu orogen: Implications for crust-mantle interaction in continental subduction zone

Li, Haiyong; Chen, Ren‐Xu; Zheng, Yong‐Fei; Hu, Zhaochu

doi:10.1016/j.chemgeo.2017.09.025

Cited by 10 publications

(11 citation statements)

References 189 publications

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“…Lastly, clinopyroxenes in FMC and AVP pyroxenites contain 1.5-3.5 times more water than orthopyroxenes from the same sample (Fig. 9), consistent with the range of water J o u r n a l P r e -p r o o f partition coefficients between clinopyroxene and orthopyroxene (𝐷 H 2 O Cpx;Opx ) determined in natural samples: 1.5-3.5 (Warren and Hauri, 2014;Bizimis and Peslier, 2015;Demouchy and Bolfan-Casanova, 2016;Demouchy et al, 2017;Peslier et al, 2017;Xia et al, 2017;Hao et al, 2018;Li et al, 2018). Hence, clinopyroxene and orthopyroxene water contents are considered to be in equilibrium for all samples studied herein.…”

Section: Water Contents: Mantle Signature Preservation and Whole-rock Water Concentrationssupporting

confidence: 77%

“…In contrast, other studies have attributed high water concentrations in pyroxenites and peridotites to metasomatic agents (e.g., Peslier and Bizimis, 2015;Li et al, 2018;Patkó et al, J o u r n a l P r e -p r o o f 2019). In this perspective, we explore the influence of metasomatism on AVP and FMC pyroxenite water contents to determine if they represent those acquired during metasomatism or rather document the subsequent equilibration conditions of the mantle metacumulates.…”

Section: Influence Of Metasomatism On Water Contents: Unaffected Avp Pyroxenites Vs Dehydrated Fmc Pyroxenitesmentioning

confidence: 88%

“…This was confirmed by Hauri et al (2006) > 350 ppm) in mantle melting could account for the low H 2 O/Ce ratios of some fertile magmas (Hawaii, Samoa, Society). Relying on those important results and based on the observation that pyroxenites from other settings are also characterized by low H 2 O/Ce ratios (e.g., Hao et al, 2018;Li et al, 2018;Fig. 13), it seems plausible that the H 2 O/Ce ratio of basalts might track the involvement of pyroxenite in their genesis.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 95%

“…where garnet pyroxenites are stable (deeper than 45 km), those lithologies are essential to our understanding of magma genesis. Nevertheless, few data are available on the water contents of garnet pyroxenites (Bizimis and Peslier, 2015;Hao et al, 2018;Li et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Mantle metasomatic influence on water contents in continental lithosphere: New constraints from garnet pyroxenite xenoliths (France & Cameroon volcanic provinces)

et al. 2021

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Section: Water Contents: Mantle Signature Preservation and Whole-rock Water Concentrationssupporting

confidence: 77%

Section: Influence Of Metasomatism On Water Contents: Unaffected Avp Pyroxenites Vs Dehydrated Fmc Pyroxenitesmentioning

confidence: 88%

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Mantle metasomatic influence on water contents in continental lithosphere: New constraints from garnet pyroxenite xenoliths (France & Cameroon volcanic provinces)

et al. 2021

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“…The former are often characterized, for example, by a prominent OHmode at 3570 cm -1 (Bell and Rossman 1992b). It goes without out saying that pyropes from Earth's mantle, as found in various xenoliths from kimberlites (e.g., Bell and Rossman 1992b;Matsyuk et al 1998), and in other types of eclogites (e.g., Schmädike et al 2015;Liu et al 2016;Gose and Schmädicke 2018;Zhang et al 2019) and pyroxenites (Li et al 2018), have a completely different petrologic origin than those found in the UHP whiteschists and quartzites at Dora Maira. The chemistries of mantle garnets are more complex and varied, as they contain a number of chemical components (Dawson and Stephens 1975).…”

Section: There Are Pyropes and There Are Pyropes: Differences In Compmentioning

confidence: 99%

Micro- and nano-size hydrogrossular-like clusters in pyrope crystals from ultra-high-pressure rocks of the Dora-Maira Massif, western Alps

Geiger

Rossman

2020

Contrib Mineral Petrol

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The supracrustal metamorphic rocks of the Dora-Maira Massif, western Alps, have been intensively studied. Certain ultrahigh-pressure lithologies contain coesite and nearly end-member composition pyrope, Mg 3 Al 2 Si 3 O 12 , making this locality petrologically and mineralogically unique. Structural OH-, loosely termed "water", in pyrope crystals of different composition has been investigated numerous times, using different experimental techniques, by various researchers. However, it is not clear where the minor OHis located in them. IR single-crystal spectra of two pyropes of composition {Mg 2.79 ,Fe 2+ 0.15 , Ca 0.04 } Σ2.98 [Al] 2.02 (Si) 2.99 O 12 and {Mg 2.90 ,Fe 2+ 0.04 ,Ca 0.02 } Σ2.96 [Al] 2.03 (Si) 3 O 12 were recorded at room temperature (RT) and 80 K. The spectra show five distinct OHbands located above 3600 cm-1 at RT and seven narrow bands at 80 K and additional fine structure. The spectra were curve fit and the OHstretching modes analyzed and assigned. It is argued that OHis located in microscopic-and nano-size Ca 3 Al 2 H 12 O 12-like clusters. The basic substitution mechanism is the hydrogarnet one, where (H 4 O 4) 4-⇔ (SiO 4) 4-, and various local configurations containing different numbers of (H 4 O 4) 4groups define the cluster type. The amounts of H 2 O range between 5 and 100 ppm by weight, depending on the IR calibration adopted, and are variable among crystals. Hydrogrossular-like clusters are also present in a synthetic pyrope with a minor Ca content grown hydrothermally at 900 °C and 20 kbar, as based on its IR spectra at RT and 80 K. Experiment and nature are in agreement, and OHgroups are partitioned into various barely nano-size hydrogrossular-like clusters. This proposal is new and significant mineralogical, petrological, and geochemical implications result. Ca and proton ordering occur. Hypothetical "defect" and/or coupled-substitution mechanisms to account for structural OHare not needed to interpret experimental results. OHincorporation in pyrope of different generations at Dora-Maira is discussed and OHcould potentially be used as an indicator of changing P H 2 O (a H 2 O)-T conditions in a metamorphic cycle. Published experimental hydration, dehydroxylation, and hydrogen diffusion results on Dora-Maira pyropes can now be interpreted atomistically.

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Subduction-zone peridotites and their records of crust-mantle interaction

Zheng

Xiong

Zhao

et al. 2019

Sci. China Earth Sci.

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Water in garnet pyroxenite from the Sulu orogen: Implications for crust-mantle interaction in continental subduction zone

Cited by 10 publications

References 189 publications

Mantle metasomatic influence on water contents in continental lithosphere: New constraints from garnet pyroxenite xenoliths (France & Cameroon volcanic provinces)

Mantle metasomatic influence on water contents in continental lithosphere: New constraints from garnet pyroxenite xenoliths (France & Cameroon volcanic provinces)

Micro- and nano-size hydrogrossular-like clusters in pyrope crystals from ultra-high-pressure rocks of the Dora-Maira Massif, western Alps

Subduction-zone peridotites and their records of crust-mantle interaction

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