An SPO-induced CPO in composite mantle xenoliths correlated with increasing melt-rock interaction

Chin, Emily; Soustelle, Vincent; Liu, Yongsheng

doi:10.1016/j.gca.2019.10.002

Cited by 20 publications

(19 citation statements)

References 104 publications

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“…Our data show that the [010]‐fiber CPO is the most common fabric type for olivine in the studied samples. The same CPO pattern has also been recently documented in pyroxenite‐vein‐bearing peridotites (composite xenoliths) from Damaping (Chin et al., 2020). This kind of CPO, also termed as AG‐type (Mainprice, 2007), had been reported by many previous studies on peridotites from various geological settings (e.g., Bascou et al., 2008; Le Roux et al., 2007; Tommasi et al., 2006, 2008; Vauchez et al., 2005).…”

Section: Discussionsupporting

confidence: 73%

Influence of Melt‐Peridotite Interactions on Deformation and Seismic Properties of the Upper Mantle Beneath a Destroyed Craton: A Case Study of the Damaping Peridotites From the North China Craton

2023

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Extensive melt‐peridotite interactions had been documented in the lithospheric mantle beneath the North China Craton (NCC), a prime example of destroyed cratons in the world. Yet the impacts of melt‐peridotite interactions on the deformation and seismic anisotropy of the NCC upper mantle remain unclear. Here we studied in detail the microstructure, crystallographic preferred orientation (CPO) of minerals, and seismic properties of 26 peridotite xenoliths from the Damaping area of the NCC. The studied samples can be classified into two groups: weakly to nonfoliated and strongly foliated. Petrographic and microstructural observations suggest that multiple melt‐peridotite interactions and at least two stages of deformation had influenced samples from both microstructural groups. Dislocation creep in response to a transpression deformation led to the [010]‐fiber type olivine CPOs in most samples. Variable degrees of annealing followed the last stage of deformation. Due to a higher degree of melt‐peridotite interactions, which had promoted nondislocation creep, and more extensive annealing, olivine and pyroxene in the strongly foliated samples developed weaker CPOs. This in turn leads to weaker maximum P wave propagation anisotropy and S wave polarization anisotropy for this microstructural group. Our data, therefore, cast light on a strong control of intensity of melt‐peridotite interactions on deformation and seismic properties of the upper mantle beneath the NCC. If foliation and lineation are vertical and horizontal, respectively, the measured SKS splitting parameters can be well explained by the “fossil” anisotropy frozen in the lithospheric mantle, with no need to invoke asthenospheric flow as a source of the anisotropy.

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Section: Discussionsupporting

confidence: 73%

Influence of Melt‐Peridotite Interactions on Deformation and Seismic Properties of the Upper Mantle Beneath a Destroyed Craton: A Case Study of the Damaping Peridotites From the North China Craton

2023

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“…Although the B‐type olivine fabrics (Kaczmarek et al., 2016) have been interpreted to reflect mantle environments, the fabrics are also consistent with crustal cumulate origins (also see Waterton et al., 2022) because such fabrics can form via processes that could happen at crustal levels (e.g., Chin et al., 2020; Holtzman et al., 2003; Nagaya et al., 2014; Yao et al., 2019). Specifically, olivines with B‐type fabrics can form via deformation in the presence of melts (e.g., Chin et al., 2020; Holtzman et al., 2003); via compaction during cumulate formation (e.g., Yao et al., 2019); and via dehydration breakdown of oriented antigorite crystals (Nagaya et al., 2014). Therefore, B‐type olivine fabrics do not represent a diagnostic signature of deformation in the mantle wedge (cf.…”

Section: Discussionmentioning

confidence: 98%

Earth's Earliest Phaneritic Ultramafic Rocks: Mantle Slices or Crustal Cumulates?

Zuo

Webb

Chin

et al. 2022

Geochem Geophys Geosyst

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“…CPOs other than A‐ and AG‐types observed in natural samples may not rule out their formation during diffusion creep. We mentioned that olivine grains elongated along the c ‐axis are common in fluid‐bearing systems (Deer et al., 1982), which can exhibit B‐ and C‐type fabrics in melt‐bearing peridotite (Chin et al., 2020; Miyazaki et al., 2013; Qi et al., 2018). We were not able to clearly demonstrate the formation of E‐type fabric, which has been previously predicted to appear at <1,250°C in the aggregates used in this study.…”

Section: Discussionmentioning

confidence: 99%

Olivine Morphology and Fabric During Diffusion Creep: Pure Shear Experiments

et al. 2022

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The classic diffusion creep model predicts mass (atomic) transfer from grain boundaries that are normal to the high (compressional) stress direction to boundaries that are normal to the direction of low stress (Coble, 1963;Herring, 1950; Nabbaro, 1948). This process produces grains with anisotropic shapes that are often responsible for mineral lineations and foliations in deformed rocks (Passchier & Trouw, 2005). Based on experimental studies on fine-grained olivine aggregates, we recently reported the finding that diffusion creep is in fact diffusion-controlled (accommodated) grain-boundary sliding (GBS) creep (Maruyama & Hiraga, 2017a;, which corresponds to the current view of the majority of material scientists (Rust & Todd, 2011). In contrast, geologists commonly identify GBS creep and diffusion creep based on equiaxed grains and anisotropic grains with a shape-preferred orientation (SPO), respectively, in highly deformed rocks (Paterson, 2001;Vernon, 2004).Our series of experimental studies on fine-grained olivine aggregates revealed the formation of either equiaxed or anisotropic (tabular) grains via static grain growth, depending on experimental conditions (Maruyama & Hiraga, 2017a;Miyazaki et al., 2013;. Tabular grains develop interfaces (i.e., grain boundaries) parallel to particular low-index crystallographic planes. Directions parallel and normal to the boundaries correspond to long and short axes of the tabular grains, respectively. Preferential GBS occurs on low-index-plane boundaries, which promotes grain rotation to align the boundaries with the shear direction, resulting in crystallographic

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An SPO-induced CPO in composite mantle xenoliths correlated with increasing melt-rock interaction

Cited by 20 publications

References 104 publications

Influence of Melt‐Peridotite Interactions on Deformation and Seismic Properties of the Upper Mantle Beneath a Destroyed Craton: A Case Study of the Damaping Peridotites From the North China Craton

Influence of Melt‐Peridotite Interactions on Deformation and Seismic Properties of the Upper Mantle Beneath a Destroyed Craton: A Case Study of the Damaping Peridotites From the North China Craton

Earth's Earliest Phaneritic Ultramafic Rocks: Mantle Slices or Crustal Cumulates?

Olivine Morphology and Fabric During Diffusion Creep: Pure Shear Experiments

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