Amphibole-bearing migmatite in North Dabie, eastern China: Water-fluxed melting of the orogenic crust

Hu, Zeng; Zhang, Yuan-Shuo; Hu, Rong; Wang, Juan; Siebel, Wolfgang; Chen, Fukun

doi:10.1016/j.jseaes.2016.05.018

Cited by 22 publications

(9 citation statements)

References 96 publications

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“…3a). The inclusions of rounded biotite, quartz and plagioclase in coarse-grained hornblende in the leucosomes are consistent with the simplified partial melting reaction: biotite + plagioclase + quartz + fluid (H2O) → hornblende + melt 1This reaction has been documented in experimental studies (Büsch et al, 1974;Naney, 1983;Gardien et al, 2000) and metaigneous migmatites (Slagstad et al, 2005;Cruciani et al 2008;Lee and Cho, 2013;Hu et al, 2016).…”

Section: Metatonalitesupporting

confidence: 71%

“…Moyen and Martin, 2012) and high-temperature melting of mafic rocks (Palin et al, 2016). The results of Lee and Cho (2013), Hu et al (2016) and this study, however, suggest that these components may represent relatively low-pressure melts produced during fluidpresent anatexis (Fig. 14).…”

Section: Initial Melt Compositionsmentioning

confidence: 55%

“…Furthermore, most TTG suites do not show clear differentiation trends among Na, Ca and K (Moyen and Martin, 2012). Trends towards more sodium-rich compositions, however, have been observed in the western Gyeonggi Massif in Korea (Lee and Cho, 2013), the Dabie Mountains in Eastern China (Hu et al, 2016), and in the Pilbara craton (Collins, 1993).…”

Section: Initial Melt Compositionsmentioning

confidence: 97%

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Fluid-present anatexis of Neoarchean tonalite and amphibolite in the Western Shandong Province

Yakymchuk

Zhao

Wan

et al. 2019

Lithos

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Highlights • Fluid-present anatexis at ~2.60 Ga reworked metatonalites and amphibolites • Melt compositions were modified by plagioclase and hornblende accumulation • δ 18 O suggest that fluid was derived from crystallization of younger tonalites Abstract Metatonalite and amphibolite from the Taishan region of the Western Shandong Province in the North China Craton record c. 2.60 Ga fluid-present partial melting via the breakdown of biotite, plagioclase and quartz to produce peritectic hornblende and anatectic melt. Eight paired leucosome-melanosome samples from metatonalite and three paired samples from amphibolite were investigated to evaluate the composition of the melt. Hornblende, biotite and plagioclase in the leucosomes and hornblende and plagioclase in melanosomes from both rock types have similar compositions. Two leucosome samples from the metatonalite were influenced by the removal of heavy rare earth element-rich hornblende and the accumulation of plagioclase. The other leucosomes are interpreted to represent near initial melt compositions with a minor component of peritectic hornblende and are enriched in Si, Na and Sr and depleted in K, Ca, Ba and Rb relative to melanosomes. The enrichment of Na in the melt is inconsistent with experimental results of fluid-present melting of tonalite, but is broadly consistent with the experimental results of fluid-fluxed melting of amphibolite. The absence of K-feldspar in both rock types is a critical control on the composition of anatectic melt and initial melt compositions were probably similar for both rock types. Leucosomes inherited rare earth element patterns from their sources, which suggests that some trace element diagrams used to infer tectonic settings and depths of melting are not appropriate for reworked components of Archean grey gneisses. Whole-rock δ 18 O suggest that the fluids responsible for inducing local melting were derived from the intrusion and crystallization of ~2.60 Ga tonalites and trondhjemites in the Taishan region. One amphibolite sample has a relatively low δ 18 O suggestive of interaction with meteoric water or seawater possibly related to crustal extension and asthenosphere upwelling at ~2.60 Ga. Fluid-present partial melting reworked 2.75-2.60 Ga tonalites and amphibolites, generating ~2.60 Ga sodium-rich components of grey gneisses in the Western Shandong Province.

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Section: Metatonalitesupporting

confidence: 71%

Section: Initial Melt Compositionsmentioning

confidence: 55%

Section: Initial Melt Compositionsmentioning

confidence: 97%

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Fluid-present anatexis of Neoarchean tonalite and amphibolite in the Western Shandong Province

Yakymchuk

Zhao

Wan

et al. 2019

Lithos

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“…It also exhibits a euhedral shape with felsic inclusions and very little recrystallization features (Figures 4e, 8a, and 9b). Such characteristics can be attributed to a peritectic reaction at granulite facies conditions (Busch et al., 1974; Hu et al., 2016; Weinberg & Hasalová, 2015). Hornblende is well oriented with high aspect ratio, and the orientation tendency (long‐axis angle) is similar to [001] direction (i.e., the coherent SPO and CPO; Table 1 and Figures 8a and 8b), accompanied with near random misorientation angle distributions (random‐pair, similar distribution to theoretical) and strain‐free internal structures of hornblende grains (Figures 8c and 9b).…”

Section: Discussionmentioning

confidence: 99%

Deformation Behavior and Inferred Seismic Properties of Tonalitic Migmatites at the Time of Pre‐melting, Partial Melting, and Post‐Solidification

Shao

Piazolo

Liu

et al. 2021

Geochem Geophys Geosyst

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As seismic data from the lower crust becomes more readily available, it is important to link seismic properties to the ongoing processes within lower crustal evolution. This includes high temperature, pre‐ and post‐migmatization solid state deformation as well as melt‐present deformation. We selected two tonalitic migmatites with variable former melt content (one metatexite and one diatexite) from the lower crustal Daqingshan area, northern North China Craton to assess the link between seismic properties and rock structure and rheology. Field observation along with microstructural features suggest that the characteristics of hornblende and plagioclase within the residuum of the metatexite can be used to derive information on the pre‐melt deformation. Residuum's plagioclase CPO (crystallographic preferred orientations) is consistent with high temperature dislocation creep as the main deformation mechanism; similarly, hornblende shows a strong CPO related to dislocation creep. During syn‐melt (melt present) conditions, phenocrysts of plagioclase in the metatexite's neosome and K‐feldspar and peritectic hornblende in the diatexite's neosome are present. The rheology of the rock was dominated by melt; hence is inferred to follow Newtonian flow. After melt crystallization deformation is minor but again dominated by dislocation creep. The seismic properties (seismic velocity, anisotropy, Vp/Vs ratio, etc.) for pre‐ and post‐melt have similar values expected values for solid mafic rocks, whilst the syn‐melt seismic velocities are generally lower and Vp/Vs ratios and seismic anisotropies are higher.

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“…Hydration melting, known as water‐fluxed melting, is also very important for crustal anatexis (Gao & Zeng, ; Gao, Zeng, & Asimow, ; Weinberg & Hasalová, ). Migmatites with leucosomes that formed under P‐T conditions below the hydrate phase solidus have generally been regarded as products of water‐fluxed melting (Berger, Burri, Alt‐Epping, & Engi, ; Hu et al, ; Mogk, ; Sawyer, ; Weinberg & Hasalová, ). Abundant H 2 O‐bearing two‐phase (liquid + vapour) fluid inclusions in the leucosomes indicate that water was present during partial melting (Figure h).…”

Section: Discussionmentioning

confidence: 99%

Tracking the timing and nature of protolith, metamorphism, and partial melting of tourmaline‐bearing migmatites by zircon U–Pb and Hf isotopic compositions in the Yuka terrane, North Qaidam UHP metamorphic belt

Gao

Chen

et al. 2018

Geological Journal

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An integrated study using cathodoluminescence (CL) images, U–Pb geochronology, and Hf isotopic characterization of zircons was performed on migmatites from the Yuka terrane to provide insights into the timing and nature of the protoliths, metamorphism, and partial melting of these rocks. Zircon grains separated from the migmatites have three distinct domains. Residual zircon cores in samples YKT01 and YKT02 exhibit oscillatory zoning, high Th/U ratios (0.10–0.79), steep heavy rare earth element (HREE) patterns, and mean ages of 936 ± 5 Ma and 927 ± 11 Ma, respectively, indicating that they are igneous in origin and record Neoproterozoic magmatism during the Grenvillian Orogeny. CL‐grey cores record an ultrahigh‐pressure (UHP) peak metamorphism age of 435 ± 5 Ma and have low Th/U and 176Lu/177Hf ratios, weak negative Eu anomalies, and relatively flat HREE patterns. The CL‐bright rims have steep HREE patterns with lower middle rare earth element (MREE) concentrations but higher HREE concentrations compared with the metamorphic cores and a weighted average age of 422 ± 4 Ma, which records the timing of melt crystallization. The migmatites incorporate garnet relicts coexisting with fluid inclusions and hydrous minerals like peritectic phengite and peritectic large anhedral poikilitic tourmaline in the leucosomes. Peak temperatures are less than 750°C, suggesting that the anatectic melts may be derived from melting of felsic gneiss in the presence of water. The timing of melt crystallization is ca. 13 Ma later than UHP metamorphism, indicating that the partial melting took place during the exhumation stage. The metamorphic zircon cores have higher 176Hf/177Hf(t) ratios than the residual magmatic cores, which provides powerful evidence for the generation of the metamorphic zircons through the incorporation of internal high Hf minerals other than zircon in a closed system. Anatectic rims with lower 176Hf/177Hf(t) ratios but higher 176Lu/177Hf ratios than metamorphic cores suggest that the main formation mechanism is dissolution‐reprecipitation of pre‐existing zircons. In conclusion, the elevated 176Hf/177Hf(t), TDM2 age and decreasing 176Lu/177Hf(t) ratios in the metamorphic and anatectic domains imply that the new zircons in some migmatites and granites may not reflect the Hf isotope compositions of their source rocks, accounting for the variable Hf isotope compositions in S‐type granites.

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Amphibole-bearing migmatite in North Dabie, eastern China: Water-fluxed melting of the orogenic crust

Cited by 22 publications

References 96 publications

Fluid-present anatexis of Neoarchean tonalite and amphibolite in the Western Shandong Province

Fluid-present anatexis of Neoarchean tonalite and amphibolite in the Western Shandong Province

Deformation Behavior and Inferred Seismic Properties of Tonalitic Migmatites at the Time of Pre‐melting, Partial Melting, and Post‐Solidification

Tracking the timing and nature of protolith, metamorphism, and partial melting of tourmaline‐bearing migmatites by zircon U–Pb and Hf isotopic compositions in the Yuka terrane, North Qaidam UHP metamorphic belt

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