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Rapid migration of a magma source from mid- to deep-crustal levels: Insights from restitic granulite enclaves and anatectic granite

Published on Jul 18, 2017in Geological Society of America Bulletin3.97
· DOI :10.1130/B31462.1
Kai Zhao2
Estimated H-index: 2
(NU: Nanjing University),
Xisheng Xu24
Estimated H-index: 24
(NU: Nanjing University)
+ 2 AuthorsYan Xia9
Estimated H-index: 9
(NU: Nanjing University)
Abstract
  • References (73)
  • Citations (3)
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References73
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#1Yanjun Li (China University of Geosciences)H-Index: 6
#2Jun–Hao Wei (China University of Geosciences)H-Index: 1
Last. Shao–Qing Zhao (China University of Geosciences)H-Index: 1
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Abstract The Bangxi-Chenxing suture zone is an important region to address the history of closure of the eastern Paleo-Tethys ocean. Among the widespread S-type granite batholiths in the SE Guangxi Province adjacent to this suture is the Nali granodiorite. Here we report zircon U–Pb ages, major and trace element geochemistry, and Sr–Nd–Hf isotope geochemistry of a newly found Middle Permian S-type granite in this region. LA-ICP-MS zircon U–Pb geochronology yields emplacement ages of 265 ± 2 to 2...
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#1Shujuan Jiao (CAS: Chinese Academy of Sciences)H-Index: 10
#2LIXianhua (CAS: Chinese Academy of Sciences)H-Index: 80
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Abstract Charnockites are Opx-bearing igneous rocks commonly found in high-grade metamorphic terranes. Despite being volumetrically minor, they show a wide range in both bulk geochemistry and intensive parameters. They form a characteristic component of the AMCG (anorthosite–mangerite–charnockite–granite) suite, but their association with typical S-type granites is less well-known. The Darongshan S-type granitic complex (DSGC) in Guangxi Province, southern China, contains granites varying in maf...
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#1Long Qiao (China University of Geosciences)H-Index: 2
#2Qingfei Wang (China University of Geosciences)H-Index: 26
Last. Chusi Li (IU: Indiana University)H-Index: 43
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The location of the suture between the Yangtze craton and the Cathaysia block is uncertain in the west. Three proposed locations for the western segment of the suture all go through Guangxi but are up to ~150 km apart. Inherited zircon crystals from the Darongshan Permian S-type granitoid plutons, which are derived from the lower crust and occur north of the southernmost location for the suture, yield U–Pb ages with a major peak at ~960 Ma. The eHf (t) values of the inherited zircons with ages a...
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#1Guochun Zhao (HKU: University of Hong Kong)H-Index: 97
Abstract The Jiangnan Orogen is considered as a continent–continent collisional belt resulting from the closure of a Meso-Neoproterozoic ocean separating the southeastern margin of the Yangtze Block from the northwestern margin of the Cathaysia Block. Recent data indicate the existence of early Neoproterozoic (1000–825 Ma) volcanic arc assemblages on both sides of the orogen, suggesting that the ocean lithosphere between the Yangtze and Cathaysia blocks must have undergone divergent double-sided...
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#1Gautier Nicoli (Stellenbosch University)H-Index: 6
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The metamorphic history of the Southern Marginal Zone (SMZ) of the Limpopo Belt, South Africa, possibly provides insight into one of the oldest preserved continental collision zones. The SMZ consists of granitoid gneisses (the Baviaanskloof Gneiss) and subordinate, infolded metasedimentary, metamafic and meta-ultramafic lithologies (the Bandelierkop Formation) and is regarded as the c. 2700 Ma granulite facies reworked equivalent of the Kaapvaal craton basement. The granulite facies metamorphism...
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Mixing between magmas is thought to affect a variety of processes, from the growth of continental crust to the triggering of volcanic eruptions, but its thermophysical viability remains unclear. Here, by using high-pressure mixing experiments and thermal calculations, we show that hybridization during single-intrusive events requires injection of high proportions of the replenishing magma during short periods, producing magmas with 55–58 wt% SiO2 when the mafic end-member is basaltic. High strai...
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#1J. Taylor (Stellenbosch University)H-Index: 5
#2Gautier Nicoli (Stellenbosch University)H-Index: 6
Last. Jean-François Moyen (Jean Monnet University)H-Index: 29
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Anatexis of metapelitic rocks at the Bandelierkop Quarry (BQ) locality in the Southern Marginal Zone of the Limpopo Belt occurred via muscovite and biotite breakdown reactions which, in order of increasing temperature, can be modelled as: (1) Muscovite + quartz + plagioclase = sillimanite + melt; (2) Biotite + sillimanite + quartz + plagioclase = garnet + melt; (3) Biotite + quartz + plagioclase = orthopyroxene ± cordierite ± garnet + melt. Reactions 1 and 2 produced stromatic leucosomes, which ...
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#1Federico Farina (UFOP: Universidade Federal de Ouro Preto)H-Index: 13
#2Andrea DiniH-Index: 20
Last. Gary Stevens (Stellenbosch University)H-Index: 35
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Abstract The broadest ranges of initial Sr isotopic ratios ( 87 Sr/ 86 Sr i ) ever reported within a single igneous rock ( ≈ 2 × 10 − 2 ) are preserved within the late Miocene laccolith-pluton-dyke felsic complex of Elba Island (Italy). For these units, the integration of textural and crystal-scale isotope data allows tracing the evolution of the 87 Sr/ 86 Sr i of the melt from the emplacement level back to the earliest pre-emplacement crystallization stage. The rock matrix minerals record the 8...
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#1Sudipta Neogi (RUB: Ruhr University Bochum)H-Index: 1
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A numerical code has been developed to track the distribution of trace elements in crustal rocks undergoing melting. The model handles diffusion with moving boundaries and accounts for the processes of diffusion, dissolution and precipitation in a partially molten system. Among the various input parameters for modelling, source composition (i.e. modal abundance) variations, diffusion coefficients and partition coefficients are found to exert a significant control on the melt chemistry. The other...
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#1Lisha Hu (China University of Geosciences)H-Index: 9
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Last. Jianghai Yang (China University of Geosciences)H-Index: 14
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Abstract Unconformity bound Permo-Triassic successions in the Qinfang Basin, South China Craton, reflect tectonic processes associated with tectonothermal activity along the margins of the craton. The provenance record of these successions, based on modal analysis, geochemical composition, detrital zircon U–Pb ages, and paleocurrent data indicate derivation from the adjoining Precambrian Yunkai massif and surrounding Paleozoic sedimentary units. The quartz dominated nature of the siliciclastic u...
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Abstract Triassic aluminous A-type granitoids, mostly peraluminous biotite granites, occur in various areas in the South China Block. Here, we focus biotite granites from three plutons and one granitic dike that provide new insights into the Triassic tectono-magmatic evolution of South China Block. The peraluminous biotite granites from Zhulanbu, Xiaotao and Wengshanplutons all emplaced at ca. 225 Ma and contain Fe-rich biotites. Their high FeOT/(FeOT+MgO) and Ga/Al ratios and HFSE contents impl...
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#1Kai Zhao (NU: Nanjing University)H-Index: 2
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Abstract Understanding fractionation of silicic magma is crucial to advance our knowledge of differentiation of continental crust, enrichment of elements of economic interest, and plutonic–volcanic connection. Microstructural records afford critical appraisals for silicic magma fractionation, yet are rarely reported in granite plutons. Here we combine detailed microstructural observations and thermodynamic modeling to quantify the components and the conditions of silicic magma fractionation usin...
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#1Wang-Chun Xu (China University of Geosciences)H-Index: 16
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Abstract The role of the mantle in generating ultrahigh-temperature metamorphism and peraluminous S-type granites, and the extent of crust−mantle interaction are topics fundamental to our understanding of the Earth's evolution. In this study we present geochronological, geochemical, and Sr–Nd–Hf isotopic data for dolerites and mafic volcanic rocks from the Darongshan granite complex belt in western Cathaysia, South China. LA–ICP–MS U–Pb zircon analyses yielded magma crystallization ages of ca. 2...
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Abstract Granites derived from partial melting of sedimentary rocks are generally characterized by high δ18O values and abundant relict zircons. Such relict zircons are valuable in tracing the source rocks of granites and the history of crustal anatexis. Here we report in-situ U-Pb ages, O isotopes and trace elements in zircons from Triassic granites in the Zhuguangshan and Jiuzhou regions, which are located in the Nanling Range and the Darongshan area, respectively, in South China. Zircon U-Pb ...
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