Petrology and geochemistry of UHP-metamorphosed ultramafic–mafic rocks from the main hole of the Chinese Continental Scientific Drilling Project (CCSD-MH), China: Fluid/melt-rock interaction

Li, Xuping; Yang, Jingsui; Robinson, Paul T.; Xu, Zhiqin; Li, Tianfu

doi:10.1016/j.jseaes.2011.01.010

Cited by 17 publications

(5 citation statements)

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“…Major element chemistry of the Jiangzhuang peridotites from this study and Zhang et al (). Also shown are “mantle” (Su et al, ; Yang et al, ; Zhang, Liou, et al, ; Zhao et al, ) and “crustal” (Li et al, ; Liu et al, ; Yang et al, ; Zhang et al, ) origins of orogenic peridotites from the Sulu orogen. Red solid lines show the ranges of polybaric fractional melting residues of fertile peridotite KR‐4003, with initial melting pressures at 10, 7, 5, 3, and 2 GPa (Herzberg, ).…”

Section: Resultsmentioning

confidence: 99%

“…Orogenic peridotites in HP‐UHP terranes are commonly subdivided into two types (Brueckner & Medaris, ; Chen et al, ; Zhang, Liou, et al, ): (1) “crustal” peridotites, which are the ultramafic portions of mafic‐ultramafic complexes cumulated in the lower crust prior to subduction (e.g., Li et al, ; Santos et al, ), and (2) “mantle” peridotites, which are derived from the mantle wedge above subducted crust (e.g., Beyer et al, ; Chen et al, ). The JZ peridotites exhibit major element compositions similar to those of mantle peridotites from the Sulu orogen but have significantly higher MgO and SiO 2 and lower FeO T contents than the Sulu crustal peridotites (Figure ).…”

Section: Discussionmentioning

confidence: 99%

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Garnetite and Pyroxenite in the Mantle Wedge Formed by Slab‐Mantle Interactions at Different Melt/Rock Ratios

Chen

Guo

et al. 2019

JGR Solid Earth

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Mantle wedge hybridization by crust-derived melt is a crucial mechanism responsible for arc lavas. However, how the melt-rock reactions proceed in the mantle wedge and affect melt compositions is poorly understood. Garnet peridotites from Jiangzhuang in the Sulu orogen (eastern China) host garnetite and pyroxenite veins formed by slab-mantle interactions at different melt/rock ratios. The Jiangzhuang peridotites consist mainly of garnet lherzolites and minor harzburgites and represent a fragment of the mantle wedge influenced by ultrahigh-pressure metamorphism (5.2-6.1 GPa) in the subduction channel. Petrography, major and trace element geochemistry, and in situ clinopyroxene Sr isotope values of the garnetite and pyroxenite veins reveal their derivation from interactions between mantle wedge peridotites and deeply subducted crust-derived melts. The two veins share a common metamorphic and metasomatic history and have similar mineral assemblages and compositions, enriched isotope signatures, and formation P-T conditions, indicating the same source for their reacting melts. The different mineral proportions and microtextures between the garnetite and pyroxenite veins are ascribed to different melt/rock ratios. The garnetite vein formed at relatively high melt/rock ratios (>1:1), which would likely produce hybrid slab melts with Mg-rich, high-silica adakitic signatures. In contrast, the pyroxenite vein formed at low melt/rock ratios (<1:1), and the expected hybrid slab melts would evolve into high-Mg andesites. Moreover, recycled heterogeneous garnetite and pyroxenite could contribute to the mantle sources of intraplate magmas. Therefore, slab-mantle interactions at different melt/rock ratios could be an important crustal input to lithological and geochemical heterogeneities in the mantle.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Garnetite and Pyroxenite in the Mantle Wedge Formed by Slab‐Mantle Interactions at Different Melt/Rock Ratios

Chen

Guo

et al. 2019

JGR Solid Earth

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“…The collision peak between the Indo-China peninsula and the South China block generated the Song Ma suture zone dated at 258~243 Ma [60]. Moreover, the metamorphic peak age of the Qinling-Dabie suture is 230~226 Ma, which represents the collision between the South China block and the North China block [61]. The collision force was transmitted from south to north, which may have been related to the sequential collision of the Indo-China peninsula, the South China block, and the North China block [60][61][62].…”

Section: Age Of the Baishi W-cu Deposit And Geodynamic Settingmentioning

confidence: 99%

“…Moreover, the metamorphic peak age of the Qinling-Dabie suture is 230~226 Ma, which represents the collision between the South China block and the North China block [61]. The collision force was transmitted from south to north, which may have been related to the sequential collision of the Indo-China peninsula, the South China block, and the North China block [60][61][62]. Indosinian orogeny completed the integration of the South China and North China blocks and formed a unified Chinese mainland.…”

Section: Age Of the Baishi W-cu Deposit And Geodynamic Settingmentioning

confidence: 99%

Geochronology of the Baishi W-Cu Deposit in Jiangxi Province and Its Geological Significance

Wang

et al. 2022

Minerals

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The Baishi W-Cu deposit is located in the Nanling metallogenic belt, which is famous for its numerous W deposits and reserves. The formation age of this deposit remains unclear. In order to further infer the formation age of the deposit, this study conducted detailed LA-ICP-MS U-Pb isotopic analyses of zircon and monazite selected from ore-related Baishi granite. The LA-ICP-MS zircon U-Pb weighted average ages of Baishi granite were determined to be 223 ± 2 Ma and 226 ± 1 Ma, and the LA-ICP-MS U-Pb weighted average ages of monazite were determined to be 224 ± 2 Ma and 223 ± 1 Ma. The BSE image of monazite was homogeneous, and the pattern of rare earth elements had an obvious negative Eu anomaly, indicating that monazite was of magmatic origin. Combining the ages of zircon and monazite, this study inferred that Baishi granite and the Baishi W-Cu deposit formed in the Triassic. The determination of the ore-forming event of the Baishi W-Cu deposit provides new data regarding the important Indosinian (Triassic) mineralization events in the Nanling metallogenic belt and suggests that geologists should strengthen the prospecting work of Indosinian tungsten deposits in the Nanling area. In terms of tectonic setting, it was inferred that the Triassic Baishi W-Cu deposit was formed in the extensional environment after intracontinental orogeny.

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“…The garnet clinopyroxenite samples show relative depletion of HFSEs (e.g., Nb, Zr, and Ti) and relative enrichment of large-ion lithophile elements (e.g., Rb, Sr, Ba, and Pb), which are typical geochemical features of subduction magmatism [63][64][65][66][67][68]. Most subduction-related UHP peridotites are interpreted to be from the lithospheric mantle wedge, above the pre-subduction zone [69,70], which typically exhibits enrichments of oceanic plate-derived elements [68,[71][72][73][74][75]. According to field observations, and petrological and geochemical data, the Hujialin garnet clinopyroxenites are cumulates formed by melt crystallization in the mantle wedge of an ancient subduction zone.…”

Section: Protolith and Structural Modelmentioning

confidence: 99%

Metamorphic Evolution of Garnet-Bearing Ultramafic Rocks in the Hujialin Area, Sulu Ultrahigh-Pressure Orogenic Belt, Eastern China

Wang

Zhang

et al. 2020

Minerals

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The Rizhao Hujialin area is located in the central Sulu ultrahigh-pressure orogenic belt, where garnet clinopyroxenite is exposed in the upper part of an ultramafic rock complex and serpentinized dunite is exposed in its lower part. Based on textural criteria, the garnet clinopyroxenites were divided into three types: Equigranular garnet, porphyroclastic garnet, and megacrystic garnet pyroxenites. The garnet clinopyroxenites have convex-upward chondrite-normalized rare earth element patterns, large positive Pb anomalies, and depletion of high-field-strength elements (e.g., Nb, Zr, and Ti), suggesting a mantle source protolith overprinted by fluid metasomatism. Petrographic, mineral chemistry, phase equilibrium modeling, and zircon U–Pb geochronology data show that the evolutionary stages of the Hujialin garnet clinopyroxenites were as follows: Stage I: formation of the magmatic protoliths; stage II: formation of megacrystic garnet pyroxenite accompanying subduction; stage III: formation of porphyroclastic or equigranular garnet clinopyroxenite with a mineral assemblage of garnet + clinopyroxene + ilmenite + humite accompanying initial exhumation at ~215.0 ± 5.7 Ma; stage IV = progressive cooling and decompression associated with the crystallization of water-bearing minerals such as clinochlore and pargasite at 206 Ma; and Stage V = late epidote amphibolite-facies retrograde metamorphism producing a mineral assemblage of garnet + clinopyroxene + amphibole + chlorite + epidote + ilmenite at ~180–174 Ma associated with fluid activity in shear–tensional fractures and/or pores. The P-T conditions of the peak metamorphism were estimated at 4.5 ± 0.5 GPa and 800 ± 50 °C. Retrograde metamorphism recorded conditions of 1.0 GPa and 710 ± 30 °C during the exhumation and cooling process. The mineral transformation from early high-Al clinopyroxene to garnet and to late diopside records the general metamorphic evolution during subduction and exhumation, respectively. One zircon U–Pb analysis presents the Palaeoproterozoic age of 1817 ± 40 Ma, which is coeval with widespread magmatic and metamorphic events in the North China Craton.

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Petrology and geochemistry of UHP-metamorphosed ultramafic–mafic rocks from the main hole of the Chinese Continental Scientific Drilling Project (CCSD-MH), China: Fluid/melt-rock interaction

Cited by 17 publications

References 79 publications

Garnetite and Pyroxenite in the Mantle Wedge Formed by Slab‐Mantle Interactions at Different Melt/Rock Ratios

Garnetite and Pyroxenite in the Mantle Wedge Formed by Slab‐Mantle Interactions at Different Melt/Rock Ratios

Geochronology of the Baishi W-Cu Deposit in Jiangxi Province and Its Geological Significance

Metamorphic Evolution of Garnet-Bearing Ultramafic Rocks in the Hujialin Area, Sulu Ultrahigh-Pressure Orogenic Belt, Eastern China

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