Metamorphic evolution of blueschists, greenschists, and metagreywackes in the Cretaceous Mt. Hibernia Complex (SE Jamaica)

Willner, Arne P.; Maresch, Walter V.; Massonne, Hans‐Joachim; Sandritter, Katharina; Willner, G.

doi:10.1127/ejm/2016/0028-2561

Cited by 13 publications

(2 citation statements)

References 63 publications

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“…4a). Similar chemographic relations among Pmp-, Lws-and Ep-bearing mineral equilibria with glaucophane in P-T space have been proposed in the Schreinemakers' net (e.g., Liou et al, 1985;Frey et al, 1991;Sato et al, 2016) and P-T pseudosections (e.g., Zhang et al, 2009;Willner et al, 2016;Tsujimori and Ernst, 2014). The retrograde pumpellyite in the Pmp + Gln + Ep + Chl + Ab assemblage might have been formed by the univariant reaction Gln + Zo + H 2 O = Pmp + Chl + Ab in the NCMASH with excess chlorite, albite, quartz, and H 2 O (Liou et al, 1985;Beiersdorfer and Day, 1995).…”

Section: Stability Field Of Pumpellyite In Blueschist-faciessupporting

confidence: 67%

Retrograde pumpellyite in the Yunotani garnet blueschist of the Omi area, Japan: An update on the cooling path

Shinji

Tsujimori

2019

Journal of Mineralogical and Petrological Sciences

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Retrograde pumpellyite was newly found in garnet blueschist that is Mg-rich equivalent of late Paleozoic retrograde eclogite of the Yunotani Valley in the Omi area, Hida-Gaien Belt. The pumpellyite with high Al/ (Al + Mg + Fe) occurs in pressure shadows around garnets; it is associated with secondary glaucophane, epidote, chlorite, titanite, phengite, albite, and quartz, which all characterize a retrograde blueschist-facies mineral assemblage after peak eclogite-facies mineral assemblage. This feature is comparable with retrograde pumpellyite in late Paleozoic garnet blueschist (with relict eclogite-facies mineral assemblage) in the Osayama area of the Chugoku Mountains. Equilibrium phase calculation confirmed that the pumpellyite is stable at a low temperature and pressure portion of the lawsonite-blueschist-facies. T-bulk-composition (Mg) pseudosection suggests that pumpellyite appears preferentially in high Mg/(Mg + Fe) bulk composition. The limited occurrence of retrograde pumpellyite in the Yunotani garnet blueschist and retrograde eclogite would be explained by Mg-rich bulk compositions. Also, the limited occurrence in pressure shadows around garnets suggests that the fluid trapped in the pressure shadows might have enhanced growth (or precipitation) of pumpellyite. This finding provides a strong evidence that the deeply subducted (eclogite-facies) metabasaltic rocks both in the Hida-Gaien Belt and the Chugoku Mountains were subjected to a very similar blueschist-facies overprinting locally reached the pumpellyite stability field. The 'Franciscan-type' cooling path suggests a 'steady-state' underflow of the paleo-Pacific oceanic plate in late Paleozoic at a convergent margin of the South China Craton.

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Section: Stability Field Of Pumpellyite In Blueschist-faciessupporting

confidence: 67%

Retrograde pumpellyite in the Yunotani garnet blueschist of the Omi area, Japan: An update on the cooling path

Shinji

Tsujimori

2019

Journal of Mineralogical and Petrological Sciences

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“…For mineral solutions and aqueous fluid, the thermodynamic mineral database from Holland and Powell (1998;updated 2002) was used. The following solid-solution models were chosen according to the recommendations of Willner et al (2016) for low-grade metamorphic conditions: Holland and Powell (2003) and Powell and Holland (1999) for white mica, epidote, chlorite, and biotite; Massonne and Willner (2008) for amphibole, pumpellyite, and stilpnomelane; and Holland and Powell (1996) for clinopyroxene. CO 2 is not considered in the pseudosection modeling approach because carbonates are almost absent in the host-rock matrix.…”

Section: Pseudosections: Model Designmentioning

confidence: 99%

Multiple veining in a paleo–accretionary wedge: The metamorphic rock record of prograde dehydration and transient high pore-fluid pressures along the subduction interface (Western Series, central Chile)

et al. 2020

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High pressure–low temperature metamorphic rocks from the late Paleozoic accretionary wedge exposed in central Chile (Pichilemu region) are characterized by a greenschist-blueschist lithological association with interbedded metasediments that reached peak burial conditions of ∼400 °C and 0.8 GPa during late Carboniferous times. We herein combine new extensive field observations, structural measurements, and geochemical and petrological data on vein and matrix material from Pichilemu transitional greenschist-blueschist facies rocks. The studied veins were first filled by albite, followed by quartz and calcite as well as glaucophane and winchite. Field, structural, and microscopic zoning patterns show that these rocks underwent a protracted sequence of prograde vein-opening events, which have been largely transposed to the main foliation before and during underplating in the basal accretion site near 25–30 km depth. While some of the earliest albite-filled vein sets may have formed after prograde breakdown of sub–greenschist facies minerals (<250 °C), our thermodynamic modeling shows that relatively minor amounts of fluid are produced in the subducted pile by dehydration reactions between 250 and 400 °C along the estimated geothermal gradient. It also confirms that the formation of interlayered blueschist and greenschist layers in Pichilemu metavolcanics is a consequence of local bulk composition variations, and that greenschists are generally not formed due to selective exhumation-related retrogression of blueschists. The early vein sets are a consequence of prograde internal fluid production followed by sets of hydrofractures formed at near-peak burial that are interpreted as a record of external fluid influx. We postulate that such a fractured sequence represents a close analogue to the high-Vp/Vs regions documented by seismological studies within the base of the seismogenic zone in active subduction settings.

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Metamorphic Facies and Facies Series

Okrusch

Frimmel

2020

Springer Textbooks in Earth Sciences, Geography and Environment

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Metamorphic evolution of blueschists, greenschists, and metagreywackes in the Cretaceous Mt. Hibernia Complex (SE Jamaica)

Cited by 13 publications

References 63 publications

Retrograde pumpellyite in the Yunotani garnet blueschist of the Omi area, Japan: An update on the cooling path

Retrograde pumpellyite in the Yunotani garnet blueschist of the Omi area, Japan: An update on the cooling path

Multiple veining in a paleo–accretionary wedge: The metamorphic rock record of prograde dehydration and transient high pore-fluid pressures along the subduction interface (Western Series, central Chile)

Metamorphic Facies and Facies Series

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