Polyphase solid-inclusions formed by interactions between infiltrating fluids and precursor minerals enclosed in garnet of UHP rocks from the Dabie Shan, China
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Abstract
Three types of polyphase solid-inclusions (PSIs) with distinct mineral assemblages and microstructures were found in garnet of an ultrahigh-pressure (UHP) eclogite-vein system from the Dabie Shan, east-central China. Type-1 PSI contains variable volumes of quartz, K-feldspar, plagioclase Β± other phases, whereas Type-2 PSI contains variable volumes of quartz, calcite Β± other phases. Both types display shapes that are compatible with those of euhedral coesite inclusions. Type-3 PSI always contains a rutile core that is surrounded by plagioclase Β± quartz and generally displays the morphology of the rutile core. Variable amounts of K-feldspar are embedded within the plagioclase of Type-3 PSIs. The three PSI types developed fluid-mediated microstructures that include wedge-like offshoot and protrusion textures and inclusion-garnet interfaces controlled by the crystallographic structure of garnet. PSIs in peak minerals of UHP rocks have been previously thought to represent primary supercritical fluid or melt inclusions. Here we propose that the studied PSIs were formed under high-pressure (HP) eclogite-facies conditions during exhumation and represent reaction products between an enclosed mineral, such as coesite and rutile, and external fluids infiltrating the host garnet along fractures that have been healed later on. Two immiscible aqueous fluids (i.e., a siliceous and a carbonaceous) were involved in the formation of these PSIs. The siliceous fluid was rich in various large ion lithophile elements like Cs, Rb, Ba, K, Pb, Li, and Sr, whereas the carbonaceous fluid was rich in Pb and Sr. The new PSI formation mechanism proposed in this study brings significant implications for tracing fluid evolution and post-entrapment modifications of mineral inclusions in HP and UHP metamorphic rocks.
Acknowledgments
We thank S. Zheng (Wuhan) and T. Theye (Stuttgart) for assistance with the EMP and T. Luo (Wuhan) for help with the LA-ICP-MS analyses. This study was funded by grant from the National Key Basic Research Program of China (No. 2015CB856101). Thorough reviews by S. Ferrero, I. Klonowska, and an anonymous reviewer as well as careful editorial handling by K. Ashley are gratefully acknowledged.
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Articles in the same Issue
- Highlights and Breakthroughs
- A closer look at shocked meteorites: Discovery of new high-pressure minerals
- In-situ dating of metamorphism in Adirondack anorthosite
- A new style of rare metal granite with Nb-rich mica: The Early Cretaceous Huangshan rare-metal granite suite, northeast Jiangxi Province, southeast China
- Tectonic controls on Ni and Cu contents of primary mantle-derived magmas for the formation of magmatic sulfide deposits
- The high-pressure anisotropic thermoelastic properties of a potential inner core carbon-bearing phase, Fe7C3, by single-crystal X-ray diffraction
- Eruption triggering by partial crystallization of mafic enclaves at Chaos Crags, Lassen Volcanic Center, California
- Sn-isotope fractionation as a record of hydrothermal redox reactions
- Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition
- Micro- and nano-scale study of deformation induced mineral transformations in Mg-phyllosilicate-rich fault gouges from the Galera Fault Zone (Betic Cordillera, SE Spain)
- High-pressure study of dravite tourmaline: Insights into the accommodating nature of the tourmaline structure
- Positively oriented trigons on diamonds from the Snap Lake kimberlite dike, Canada: Implications for fluids and kimberlite cooling rates
- Comparison of Rietveld-compatible structureless fitting analysis methods for accurate quantification of carbon dioxide fixation in ultramafic mine tailings
- Changes in physical properties of 4C pyrrhotite (Fe7S8) across the 32 K Besnus transition
- A rapid and precise quantitative electron probe chemical mapping technique and its application to an ultrahigh-pressure eclogite from the Moldanubian Zone of the Bohemian Massif (NovΓ© Dvory, Czech Republic)
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- Letter
- Fe-Ni ideality during core formation on Earth
- New Mineral Names
Articles in the same Issue
- Highlights and Breakthroughs
- A closer look at shocked meteorites: Discovery of new high-pressure minerals
- In-situ dating of metamorphism in Adirondack anorthosite
- A new style of rare metal granite with Nb-rich mica: The Early Cretaceous Huangshan rare-metal granite suite, northeast Jiangxi Province, southeast China
- Tectonic controls on Ni and Cu contents of primary mantle-derived magmas for the formation of magmatic sulfide deposits
- The high-pressure anisotropic thermoelastic properties of a potential inner core carbon-bearing phase, Fe7C3, by single-crystal X-ray diffraction
- Eruption triggering by partial crystallization of mafic enclaves at Chaos Crags, Lassen Volcanic Center, California
- Sn-isotope fractionation as a record of hydrothermal redox reactions
- Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition
- Micro- and nano-scale study of deformation induced mineral transformations in Mg-phyllosilicate-rich fault gouges from the Galera Fault Zone (Betic Cordillera, SE Spain)
- High-pressure study of dravite tourmaline: Insights into the accommodating nature of the tourmaline structure
- Positively oriented trigons on diamonds from the Snap Lake kimberlite dike, Canada: Implications for fluids and kimberlite cooling rates
- Comparison of Rietveld-compatible structureless fitting analysis methods for accurate quantification of carbon dioxide fixation in ultramafic mine tailings
- Changes in physical properties of 4C pyrrhotite (Fe7S8) across the 32 K Besnus transition
- A rapid and precise quantitative electron probe chemical mapping technique and its application to an ultrahigh-pressure eclogite from the Moldanubian Zone of the Bohemian Massif (NovΓ© Dvory, Czech Republic)
- Stracherite, BaCa6(SiO4)2[(PO4)(CO3)]F, the first CO3-bearing intercalated hexagonal antiperovskite from Negev Desert, Israel
- Letter
- Fe-Ni ideality during core formation on Earth
- New Mineral Names
