Supercooled melt inclusions in lower-crustal granulites as a consequence of rapid exhumation by channel flow

Hiroi, Yoshikuni; Yanagi, Ayahiko; Kato, Mitsuhiro; Kobayashi, Tomoyuki; Prame, Bernard; Hokada, Tomokazu; Satish-Kumar, M.; Ishikawa, Masahiro; Adachi, Tatsuro; Osanai, Yasuhito; Motoyoshi, Yoichi; Shiraishi, Kazuyuki

doi:10.1016/j.gr.2013.04.001

Cited by 27 publications

(35 citation statements)

References 39 publications

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“…Yoshimura et al (2004) considered that the garnet-sillimanite gneiss is likely a restitic product of partial melting. Partial melting of the garnet-sillimanite gneiss is also supported by the presence of 'nanogranite' (Cesare et al, 2009) or 'felsite' (Hiroi et al, 2014) inclusions in garnet porphyroblasts (Kawakami and Hokada, 2010 and this study). Peak metamorphic condition of Skallevikshalsen was previously estimated to be 770-940°C, 0.65-1.2 GPa from the garnet-biotite gneiss and 780-960°C, 0.60-1.1 GPa from the garnet-two pyroxene gneiss (Yoshimura et al, 2004).…”

Section: Geology Of Skallevikshalsen Lützow-holm Complex East Antarsupporting

confidence: 70%

“…In most cases, Cl-rich biotite is also rich in TiO 2 (4.4-6.3 wt%). Nanogranite inclusions (Cesare et al, 2009) or felsite inclusions (Hiroi et al, 2014) are exclusively included in the garnet core and are not found in the garnet rim. The mineral assemblage of the nanogranite/felsite inclusion varies, and muscovite + quartz + chlorite intergrowth was previously reported (Kawakami and Hokada, 2010).…”

Section: Sample Descriptionmentioning

confidence: 99%

“…6a) is newly found in this study. Muscovite and chlorite are formed between the intergrowth and host garnet, and cuspate or spear-shaped replacement by muscovite is developed from the edges of the nanogranite/felsite inclusion into the host garnet (e.g., Hiroi et al, 2014). Post entrapment chemical re-equilibrium between host garnet and nanogranite/felsite inclusion is inferred from the halo of Fe and Mg developed around the inclusion (Fig.…”

Section: Sample Descriptionmentioning

confidence: 99%

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Possible polymetamorphism and brine infiltration recorded in the garnet–sillimanite gneiss, Skallevikshalsen, Lützow–Holm Complex, East Antarctica

Kawakami

Hokada

Sakata

et al. 2016

Journal of Mineralogical and Petrological Sciences

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Chlorine-rich (>0.3 wt%Cl) biotite inclusions in the core of garnet porphyroblasts in the garnet-sillimanite (Grt-Sil) gneiss from Skallevikshalsen, Lützow-Holm Complex (LHC), East Antarctica is estimated to be stable under >1.2 GPa, 820-850°C, coexisted with granitic melt as suggested by the nanogranite/felsite inclusions. Rare occurrence of matrix biotite, in spite of the common occurrence of biotite as inclusions in garnet, suggests almost complete consumption of pre-existed matrix biotite during the prograde to peak metamorphism. Brine infiltration during prograde to peak metamorphism in Skallevikshalsen is supported by Cl-rich scapolite described in previous studies. Brine infiltration and progress of continuous biotite-consuming melting reactions were probably responsible for elevating the Cl content of biotite in the studied sample.In situ electron microprobe U-Th-Pb dating of monazite and the in situ laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) U-Pb dating of zircon in the Grt-Sil gneiss revealed that both monazite and zircon has the 'older age population' with~650-580 Ma and the 'younger age population' with~560-500 Ma. The REE and trace element pattern of one of the P-rich patches in the garnet core is different from the Prich garnet rim. The isotope mapping of the same patch by LA-ICPMS revealed that the patch is also observed as a domain depleted in V concentration between the patch and the garnet rim suggests that this patch is not a continuous part from the garnet rim, but is likely a relic of preexisted garnet. Kyanite included in the patch suggests that the precursor rock was presumably a medium-to high-pressure type metamorphic rock. Presence of the older age population (~650-580 Ma) monazites in Skallevikshalsen and Skallen also suggest that rocks in these areas experienced polymetamorphism, and resetting by the~560-500 Ma metamorphic event was incomplete in these areas. Taking into account the presence of Cl-rich biotite inclusions in garnet, infiltration of brine accompanied by partial melting is one probable event that took place at~560-500 Ma in the Skallevikshalsen area, and part of the monazite possibly recrystallized by this brine infiltration.Detailed microstructural observation using trace element mapping combined with detailed petrography especially focusing on the Cl-bearing minerals as a tracer of brines would become a powerful tool for better interpreting the results of monazite and zircon dating and for investigating the fluid-related crustal processes.

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Section: Geology Of Skallevikshalsen Lützow-holm Complex East Antarsupporting

confidence: 70%

Section: Sample Descriptionmentioning

confidence: 99%

Section: Sample Descriptionmentioning

confidence: 99%

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Possible polymetamorphism and brine infiltration recorded in the garnet–sillimanite gneiss, Skallevikshalsen, Lützow–Holm Complex, East Antarctica

Kawakami

Hokada

Sakata

et al. 2016

Journal of Mineralogical and Petrological Sciences

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“…Macroscopic folds of the open to tight type with gently plunging hinges are well developed in the HC (Tani and Yoshida, 1996). Evidence for fast exhumation of lower-crustal rocks to andalusite-stable upper-crustal conditions by channel flow in a continental collision orogeny has also been suggested by Hiroi et al (2014).…”

Section: Previous Petrogenetic and Tectonic Modelsmentioning

confidence: 81%

Early to late Neoproterozoic magmatism and magma mixing–mingling in Sri Lanka: Implications for convergent margin processes during Gondwana assembly

Santosh

Tsunogae

et al. 2016

Gondwana Research

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“…Nanogranites consist of cryptocrystalline multiphase aggregates with an equigranular, hypidiomorphic to allotriomorphic texture. Cesare et al (2009) Hiroi et al (2014Hiroi et al ( , 2019 and Hiroi (2020) additionally argued that felsite inclusions are significant indicators of an unexpectedly rapid cooling history of the host granulites during exhumation. Cesare, Acosta-Vigil, Ferrero, and Bartoli (2011) and Ferrero, Ziemann, Angel, O'Brien, and Wunder (2016) showed nanogranite inclusions exhibit similar features to those of felsite inclusions when they are inequigranular and contain granophyric to micrographic intergrowths of quartz and feldspar.…”

Section: Introductionmentioning

confidence: 99%

Zoned quartz phenocrysts in supercooled melt inclusions in granulites from continental collision orogens

et al. 2020

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Felsite inclusions (FIs) in granulite garnets from continental collision orogens are supercooled felsic melt inclusions. Not only do these represent non-equilibrium textures, such as dendritic and spherulitic crystals of quartz and other minerals, but the porphyritic texture is that of hypabyssal and volcanic rocks. This paper presents representative zoned quartz phenocryst-bearing FIs in various granulites from the Highland Complex in central Sri Lanka, the Lützow-Holm Complex in East Antarctica, the Grenville Province in southeastern Canada, and the Kerala Khondalite Belt in southern India. Quartz phenocrysts show simple and definite cathodoluminescence (CL) zoning with euhedral bright cores and dark rims and overgrowths. Euhedral quartz never develops in subsolidus metamorphic rocks except for vein quartz, and is characteristic of growth in a melt phase. Groundmass quartz surrounding quartz phenocrysts within the FIs is always dark in CL, whereas matrix quartz outside garnet and single-grain inclusion quartz in garnet are usually brighter than the cores of quartz phenocrysts. The close relationship between violet CL emission intensity and Ti content of quartz indicates different growth temperatures in harmony with the inferred crystallization sequence. The preservation of CL growth zoning in quartz phenocrysts and fine non-equilibrium textures imply that the cooling rates of some granulites are 1 to 2 orders of magnitude faster than so far presumed.

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Supercooled melt inclusions in lower-crustal granulites as a consequence of rapid exhumation by channel flow

Cited by 27 publications

References 39 publications

Possible polymetamorphism and brine infiltration recorded in the garnet–sillimanite gneiss, Skallevikshalsen, Lützow–Holm Complex, East Antarctica

Possible polymetamorphism and brine infiltration recorded in the garnet–sillimanite gneiss, Skallevikshalsen, Lützow–Holm Complex, East Antarctica

Early to late Neoproterozoic magmatism and magma mixing–mingling in Sri Lanka: Implications for convergent margin processes during Gondwana assembly

Zoned quartz phenocrysts in supercooled melt inclusions in granulites from continental collision orogens

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