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• W3135879609 endingPage "106096" @default.
• W3135879609 startingPage "106096" @default.
• W3135879609 abstract "In volcanic zones, geophysical observations have identified the presence of deep-seated fluids around intrusions in the mid-crust. However, the fluid compositions and mechanisms of fluid migration at high temperatures in the crust are still poorly understood. In this study, we investigated plagioclase alteration in mafic schists (clinopyroxene [Cpx] schist, hornblende [Hbl] schist, and actinolite [Act] schist) at the contact with a quartz diorite intrusion on Kinkasan Island, NE Japan. The quartz diorite consists of hornblende and plagioclase, and crystallized at 670–760 °C and 0.30–0.45 GPa. The quartz diorite contains abundant pegmatitic veins, which consist of plagioclase at their margins and K-feldspar + quartz ± garnet in their centers. Some pegmatitic veins cut the schistosity of the metamorphic rocks. In the metamorphic rocks, two stages of fluid-mediated alteration during cooling were recognized. The first stage of fluid infiltration (Stage I) was characterized by the formation of a reaction zone around pegmatitic dikes in the Cpx schists. The Cpx was altered to hornblende (Hbl) and Ca-plagioclase (An83–95) was altered to Na-plagioclase (An36–67). The replacement proceeded along the grain boundaries of plagioclase and clinopyroxene. The second stage (Stage II) resulted in the formation of K-feldspar veins and replacement of plagioclase (An35–57) by K-feldspar (An0Ab1Or99) and albite (An2Ab95Or3–An12Ab87Or1) in the Act and Hbl schists, and the latter were probably derived from the Cpx schists. Assuming the pressure was the same as the crystallization of the quartz diorite intrusion, the alteration temperatures were estimated as 690–730 °C for Stage I and 400–570 °C for Stage II. Mass balance considerations with assumptions of the volume conservation during the replacements of plagioclase and clinopyroxene/amphibole grains indicate the Cpx schists gained Na and H2O and lost Ca in Stage I, and the Act schists gained K and Si and lost Al and Ca at almost constant Na in Stage II. This indicates that the fluid composition changed from Na- to K-rich during cooling. During the Stage II alteration, when ~45% of the plagioclase grains were altered, significant nano- to micro-scale pores were generated in plagioclase, which produced a porosity of ~3.0%–3.5% in the plagioclase and increased the whole-rock porosity by 1.3% ± 0.2%. These pores are now isolated, irregularly shaped, and occur preferentially along the replacement front, suggesting that the pores migrated during or after replacement. The altered zone in plagioclase developed from trans-granular microcracks rather than grain boundaries. Our results suggest that infiltration of K-rich fluids could be self-promoting, with such fluids forming their own pathways via dissolution and precipitation processes during plagioclase replacement. Given that plagioclase is the dominant mineral in various rock types in the mid-crust, reaction-induced porosity networks in plagioclase could be the dominant fluid pathway at mid-crustal depths. The nature of this porosity and fluid migration are potentially controlled by temperature and/or the composition of the fluids." @default.
• W3135879609 created "2021-03-15" @default.
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• W3135879609 date "2021-05-01" @default.
• W3135879609 modified "2023-10-09" @default.
• W3135879609 title "Multi-stage infiltration of Na- and K-rich fluids from pegmatites at mid-crustal depths as revealed by feldspar replacement textures" @default.
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• W3135879609 cites W1830358639 @default.
• W3135879609 cites W1963712677 @default.
• W3135879609 cites W1964191227 @default.
• W3135879609 cites W1967040369 @default.
• W3135879609 cites W1971978213 @default.
• W3135879609 cites W1975987598 @default.
• W3135879609 cites W1976274418 @default.
• W3135879609 cites W1977064119 @default.
• W3135879609 cites W1978262868 @default.
• W3135879609 cites W1980155029 @default.
• W3135879609 cites W1985707168 @default.
• W3135879609 cites W2000299281 @default.
• W3135879609 cites W2004568130 @default.
• W3135879609 cites W2008632542 @default.
• W3135879609 cites W2019877001 @default.
• W3135879609 cites W2024427164 @default.
• W3135879609 cites W2024724981 @default.
• W3135879609 cites W2039000729 @default.
• W3135879609 cites W2040549377 @default.
• W3135879609 cites W2040783044 @default.
• W3135879609 cites W2050423945 @default.
• W3135879609 cites W2054754724 @default.
• W3135879609 cites W2059242440 @default.
• W3135879609 cites W2068168052 @default.
• W3135879609 cites W2069648432 @default.
• W3135879609 cites W2075474750 @default.
• W3135879609 cites W2077964528 @default.
• W3135879609 cites W2079032830 @default.
• W3135879609 cites W2082246974 @default.
• W3135879609 cites W2087168424 @default.
• W3135879609 cites W2089813287 @default.
• W3135879609 cites W2100411277 @default.
• W3135879609 cites W2102879515 @default.
• W3135879609 cites W2105662998 @default.
• W3135879609 cites W2108029833 @default.
• W3135879609 cites W2109152678 @default.
• W3135879609 cites W2112132416 @default.
• W3135879609 cites W2117728400 @default.
• W3135879609 cites W2118653910 @default.
• W3135879609 cites W2125585387 @default.
• W3135879609 cites W2127236625 @default.
• W3135879609 cites W2133564880 @default.
• W3135879609 cites W2136343950 @default.
• W3135879609 cites W2146208578 @default.
• W3135879609 cites W2162575027 @default.
• W3135879609 cites W2162648370 @default.
• W3135879609 cites W2165609179 @default.
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• W3135879609 cites W2313527464 @default.
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• W3135879609 cites W2403936720 @default.
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• W3135879609 doi "https://doi.org/10.1016/j.lithos.2021.106096" @default.
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