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Yueheng Yang - One of the best experts on this subject based on the ideXlab platform.

  • zircon lu hf isotopic compositions of metaluminous and peralkaline a type granitic plutons of the emeishan large igneous province sw china constraints on the Mantle Source
    Journal of Asian Earth Sciences, 2009
    Co-Authors: Gregory J Shellnutt, Meifu Zhou, Christina Yan Wang, Yueheng Yang
    Abstract:

    Abstract Permian A-type granitoids of the Emeishan large igneous province (ELIP) in the Panxi region, SW China, are predominantly peralkaline and metaluminous in composition. In situ zircon Hf isotopic compositions along with whole rock trace element and Nd isotopic data are used to examine the probable Source characteristics of these A-type granitic plutons. Zircons from the Baima and Taihe peralkaline plutons have weighted average eHf (T) values of +8.7 ± 0.4 and +9.2 ± 1.0, whereas the Woshui and Huangcao metaluminous plutons have differing eHf (T) values (+8.6 ± 0.2 and +5.8 ± 0.3, respectively). Previous studies have suggested that the plutons were derived by differentiation (e.g. fractionation or partial melting) of mafic magmas from an enriched Mantle Source similar to oceanic island basalt with little or no contribution from the crust (eNd (T)  = +1.3 to +3.2, Zr/Nb = 0.9–14.4, Rb/Nb = 0.1–8.4 and Th/Ta =  (T) values of the Woshui and Baima plutons indicates that spatially and temporally associated peralkaline and metaluminous A-type granitic rocks can originate from the same Mantle Source without crustal assimilation.

  • zircon lu hf isotopic compositions of metaluminous and peralkaline a type granitic plutons of the emeishan large igneous province sw china constraints on the Mantle Source
    Journal of Asian Earth Sciences, 2009
    Co-Authors: Gregory J Shellnutt, Meifu Zhou, Christina Yan Wang, Yueheng Yang
    Abstract:

    Abstract Permian A-type granitoids of the Emeishan large igneous province (ELIP) in the Panxi region, SW China, are predominantly peralkaline and metaluminous in composition. In situ zircon Hf isotopic compositions along with whole rock trace element and Nd isotopic data are used to examine the probable Source characteristics of these A-type granitic plutons. Zircons from the Baima and Taihe peralkaline plutons have weighted average eHf(T) values of +8.7 ± 0.4 and +9.2 ± 1.0, whereas the Woshui and Huangcao metaluminous plutons have differing eHf(T) values (+8.6 ± 0.2 and +5.8 ± 0.3, respectively). Previous studies have suggested that the plutons were derived by differentiation (e.g. fractionation or partial melting) of mafic magmas from an enriched Mantle Source similar to oceanic island basalt with little or no contribution from the crust (eNd(T) = +1.3 to +3.2, Zr/Nb = 0.9–14.4, Rb/Nb = 0.1–8.4 and Th/Ta =

Meifu Zhou - One of the best experts on this subject based on the ideXlab platform.

  • heterogeneous Mantle Source and magma differentiation of quaternary arc like volcanic rocks from tengchong se margin of the tibetan plateau
    Contributions to Mineralogy and Petrology, 2012
    Co-Authors: Meifu Zhou, Paul T Robinson, Christina Yan Wang, Junhong Zhao, John Malpas
    Abstract:

    The Tengchong volcanic field north of the Burma arc comprises numerous Quaternary volcanoes in the southeastern margin of the Tibetan Plateau. The volcanic rocks are grouped into four units (1–4) from the oldest to youngest. Units 1, 3 and 4 are composed of olivine trachybasalt, basaltic trachyandesite and trachyandesite, and Unit 2 consists of hornblende dacite. The rocks of Units 1, 3, and 4 form a generally alkaline suite in which the rocks plot along generally linear trends on Harker diagrams with only slight offset from unit to unit. They contain olivine phenocrysts with Fo values ranging from 65 to 85 mol% and have Cr-spinel with Cr# ranging from 23 to 35. All the rocks have chondrite-normalized REE patterns enriched in LREE and primitive Mantle-normalized trace element patterns depleted in Ti, Nb and Ta, but they are rich in Th, Ti and P relative to typical arc volcanics. Despite minor crustal contamination, 87Sr/86Sr ratios (0.706–0.709), eNd values (−3.2 to −8.7), and eHf values (+4.8 to −6.4) indicate a highly heterogeneous Mantle Source. The Pb isotopic ratios of the lavas (206Pb/204Pb = 18.02–18.30) clearly show an EMI-type Mantle Source. The underlying Mantle Source was previously modified by subduction of the Neo-Tethyan oceanic and Indian continental lithosphere. The present heterogeneous Mantle Source is interpreted to have formed by variable additions of fluids and sediments derived from the subducted Indian Oceanic lithosphere, probably the Ninety East Ridge. Magma generation and emplacement was facilitated by transtensional NS-trending strike-slip faulting.

  • Metasomatic Mantle Source and crustal contamination for the formation of the Neoproterozoic mafic dike swarm in the northern Yangtze Block, South China
    Lithos, 2009
    Co-Authors: Junhong Zhao, Meifu Zhou, Zheng Jian-ping
    Abstract:

    Abstract In the Huangling region of the northern Yangtze Block, South China, the 820-Ma Huangling felsic pluton was intruded by ∼ 800-Ma mafic dikes. These dikes are composed of fine- to medium-grained diabase, porphyritic diabase and olivine gabbro. Quartz xenocrysts occur locally in the olivine gabbro. The rocks are alkaline to sub-alkaline in composition and have SiO2 ranging from 43.3 to 57.2 wt.%, MgO from 3.7 to 9.2 wt.% and total alkali from 3.0 to 7.3 wt.%. They exhibit LREE enrichment ((La/Yb)n = 3.3–28.5) with slightly negative Eu anomalies (Eu/Eu* = 0.6–1.0). Their primitive Mantle-normalized trace element patterns are characterized by enrichment of large-ion lithophile elements (Rb, Ba, Th and U), depletion of high-field-strength elements (Nb, Ta, Zr and Hf) and positive Pb and negative Ti anomalies. They have relatively high initial 87Sr/86Sr ratios ranging from 0.7052 to 0.7080 and variably negative eNd(t) values from − 4.2 to − 10.9. The rocks have a large range of whole-rock eHf values (− 0.35 to − 11.34) and a relatively narrow range of Pb isotope ratios (206Pb/204Pb = 16.96 to 17.97, 207Pb/204Pb = 15.41 to 15.58, and 208Pb/204Pb = 38.08 to 39.66). Initial 87Sr/86Sr ratios correlate negatively with 206Pb/204Pb ratios, whereas 143Nd/144Nd and 208Pb/204Pb ratios and eHf values correlate positively with 206Pb/204Pb ratios. These features are indicative of an EM2 Source region, suggesting a lithospheric Mantle Source modified by subducted components during the Neoproterozoic. The quartz xenocrysts and linear isotopic variations indicate strong crustal contamination during magma emplacement. The energy-constrained assimilation and fractional crystallization (EC-AFC) modeling calculations reveal that the parental magmas were contaminated by continental crust, including Archaean amphibolites, granitic gneisses, metasedimentary rocks and granitic rocks. The mafic dikes are 20 myrs younger than the Huangling felsic pluton, which was produced by partial melting of a thickened continental crust, suggesting that the mafic dikes were a consequence of post-orogenic extension. The Huangling region may have originally been located at the centre of the Yangtze Block. The possible heat Source for the generation of the Huangling felsic pluton and mafic dikes was asthenospheric wedging resulting from oceanic slab subduction beneath the northern margin of the Yangtze Block. This conclusion rules out the possibility that the Yangtze Block was located in the central part of the Rodinia supercontinent. The block was more likely situated along the margin of Rodinia.

  • zircon lu hf isotopic compositions of metaluminous and peralkaline a type granitic plutons of the emeishan large igneous province sw china constraints on the Mantle Source
    Journal of Asian Earth Sciences, 2009
    Co-Authors: Gregory J Shellnutt, Meifu Zhou, Christina Yan Wang, Yueheng Yang
    Abstract:

    Abstract Permian A-type granitoids of the Emeishan large igneous province (ELIP) in the Panxi region, SW China, are predominantly peralkaline and metaluminous in composition. In situ zircon Hf isotopic compositions along with whole rock trace element and Nd isotopic data are used to examine the probable Source characteristics of these A-type granitic plutons. Zircons from the Baima and Taihe peralkaline plutons have weighted average eHf (T) values of +8.7 ± 0.4 and +9.2 ± 1.0, whereas the Woshui and Huangcao metaluminous plutons have differing eHf (T) values (+8.6 ± 0.2 and +5.8 ± 0.3, respectively). Previous studies have suggested that the plutons were derived by differentiation (e.g. fractionation or partial melting) of mafic magmas from an enriched Mantle Source similar to oceanic island basalt with little or no contribution from the crust (eNd (T)  = +1.3 to +3.2, Zr/Nb = 0.9–14.4, Rb/Nb = 0.1–8.4 and Th/Ta =  (T) values of the Woshui and Baima plutons indicates that spatially and temporally associated peralkaline and metaluminous A-type granitic rocks can originate from the same Mantle Source without crustal assimilation.

  • zircon lu hf isotopic compositions of metaluminous and peralkaline a type granitic plutons of the emeishan large igneous province sw china constraints on the Mantle Source
    Journal of Asian Earth Sciences, 2009
    Co-Authors: Gregory J Shellnutt, Meifu Zhou, Christina Yan Wang, Yueheng Yang
    Abstract:

    Abstract Permian A-type granitoids of the Emeishan large igneous province (ELIP) in the Panxi region, SW China, are predominantly peralkaline and metaluminous in composition. In situ zircon Hf isotopic compositions along with whole rock trace element and Nd isotopic data are used to examine the probable Source characteristics of these A-type granitic plutons. Zircons from the Baima and Taihe peralkaline plutons have weighted average eHf(T) values of +8.7 ± 0.4 and +9.2 ± 1.0, whereas the Woshui and Huangcao metaluminous plutons have differing eHf(T) values (+8.6 ± 0.2 and +5.8 ± 0.3, respectively). Previous studies have suggested that the plutons were derived by differentiation (e.g. fractionation or partial melting) of mafic magmas from an enriched Mantle Source similar to oceanic island basalt with little or no contribution from the crust (eNd(T) = +1.3 to +3.2, Zr/Nb = 0.9–14.4, Rb/Nb = 0.1–8.4 and Th/Ta =

Christina Yan Wang - One of the best experts on this subject based on the ideXlab platform.

  • crustal recycling processes in generating the early cretaceous fangcheng basalts north china craton new constraints from mineral chemistry oxygen isotopes of olivine and whole rock geochemistry
    Lithos, 2013
    Co-Authors: Christina Yan Wang, Chaowen Li
    Abstract:

    Abstract The early Cretaceous Fangcheng basalts were erupted in the peak stage of lithospheric thinning of the North China Craton (NCC). They have olivine phenocrysts with forsterite (Fo) contents ranging from 74 to 92, clinopyroxene with high Mg# from 76 to 89, and contain pyroxenite xenoliths. Both the basalts and pyroxenite xenoliths have coexisting high-Ca and low-Al clinopyroxene and high-Mg and low-Ca olivine, indicating that the parental magmas of the basalts have high water contents comparable with arc basalts. They also show similar mineral chemistry and olivine O isotopic compositions (δ 18 O = 5.5–7.2‰), trace element patterns with large ion lithophile elements (LILEs) and light rare earth elements (LREEs) enrichments and high field strength elements (HFSEs) depletions, as well as enriched Sr–Nd–Hf isotopic features. Therefore, the pyroxenite xenoliths are cognate with the basalts. High δ 18 O values (average ~ 6.5‰) of fresh olivine crystals from the basalts and xenoliths indicate the involvement of 18 O-rich crustal materials in the Mantle Source. Incorporation of 18 O-rich crustal materials to the Mantle Source is consistent with the highly evolved Sr–Nd–Hf isotopic signatures of the basalts and the pyroxenite xenoliths. Modeling results based on the Sr–Nd–O isotopic compositions of the basalts indicate that both upper and lower crustal materials of the Yangtze Block may have been incorporated into the Mantle Source. Therefore, the 18 O-rich crustal materials were likely derived from the subducted Yangtze Block in Triassic time. However, neither the NCC subcontinental lithospheric Mantle nor the deeply subducted Yangtze crustal materials can provide sufficient water to produce hydrous basaltic magmas, instead exotic fluids may have been derived from the subducted paleo-Pacific slab. Dehydration of the subducted paleo-Pacific slab may have released enough fluids to trigger extensive hydrous melting of the enriched Mantle Source beneath the Fangcheng and its surrounding regions.

  • zircon u pb dating and hf o isotopes of the zhouan ultramafic intrusion in the northern margin of the yangtze block sw china constraints on the nature of Mantle Source and timing of the supercontinent rodinia breakup
    Chinese Science Bulletin, 2013
    Co-Authors: Mengxi Wang, Christina Yan Wang, Junhong Zhao
    Abstract:

    The Zhouan ultramafic intrusion in the northern margin of the Yangtze Block is mainly composed of lherzolite. Zircon grains selected from lherzolite are irregular in shape with distinct oscillatory and sector zoning and have Th/U ratios ranging from 0.8 to 10.6, indicating a magmatic origin. The weighted average 206Pb/238U age is 637±4 Ma (2σ, n=15), which can be considered as the crystallization age of the Zhouan intrusion. Zircon grains have δ18O values ranging from 5.2‰ to 7.0‰, with an averaged value of 5.8±0.4‰ (1σ, n=33), similar to the Mantle δ18O value of zircon. Their 176Hf/177Hf(t) ratios range from 0.282410 to 0.282594 with ɛHf(t) values ranging from 1.3 to 7.6, lower than the corresponding value of the depleted Mantle (∼15), indicating an enriched Mantle Source. The enriched Mantle Source may have generated from a metasomatized lithospheric Mantle with subducted slab. A number of ∼635 Ma mafic-ultramafic intrusions in the Suizao basin are associated with coeval bimodal volcanics of the Yaolinghe Formation, indicating a continental rift setting. The ∼635 Ma magmatic event in this region may represent the product of the last breakup of the Rodinia supercontinent in the northern margin of the Yangtze Block at Neoproterozoic.

  • heterogeneous Mantle Source and magma differentiation of quaternary arc like volcanic rocks from tengchong se margin of the tibetan plateau
    Contributions to Mineralogy and Petrology, 2012
    Co-Authors: Meifu Zhou, Paul T Robinson, Christina Yan Wang, Junhong Zhao, John Malpas
    Abstract:

    The Tengchong volcanic field north of the Burma arc comprises numerous Quaternary volcanoes in the southeastern margin of the Tibetan Plateau. The volcanic rocks are grouped into four units (1–4) from the oldest to youngest. Units 1, 3 and 4 are composed of olivine trachybasalt, basaltic trachyandesite and trachyandesite, and Unit 2 consists of hornblende dacite. The rocks of Units 1, 3, and 4 form a generally alkaline suite in which the rocks plot along generally linear trends on Harker diagrams with only slight offset from unit to unit. They contain olivine phenocrysts with Fo values ranging from 65 to 85 mol% and have Cr-spinel with Cr# ranging from 23 to 35. All the rocks have chondrite-normalized REE patterns enriched in LREE and primitive Mantle-normalized trace element patterns depleted in Ti, Nb and Ta, but they are rich in Th, Ti and P relative to typical arc volcanics. Despite minor crustal contamination, 87Sr/86Sr ratios (0.706–0.709), eNd values (−3.2 to −8.7), and eHf values (+4.8 to −6.4) indicate a highly heterogeneous Mantle Source. The Pb isotopic ratios of the lavas (206Pb/204Pb = 18.02–18.30) clearly show an EMI-type Mantle Source. The underlying Mantle Source was previously modified by subduction of the Neo-Tethyan oceanic and Indian continental lithosphere. The present heterogeneous Mantle Source is interpreted to have formed by variable additions of fluids and sediments derived from the subducted Indian Oceanic lithosphere, probably the Ninety East Ridge. Magma generation and emplacement was facilitated by transtensional NS-trending strike-slip faulting.

  • zircon lu hf isotopic compositions of metaluminous and peralkaline a type granitic plutons of the emeishan large igneous province sw china constraints on the Mantle Source
    Journal of Asian Earth Sciences, 2009
    Co-Authors: Gregory J Shellnutt, Meifu Zhou, Christina Yan Wang, Yueheng Yang
    Abstract:

    Abstract Permian A-type granitoids of the Emeishan large igneous province (ELIP) in the Panxi region, SW China, are predominantly peralkaline and metaluminous in composition. In situ zircon Hf isotopic compositions along with whole rock trace element and Nd isotopic data are used to examine the probable Source characteristics of these A-type granitic plutons. Zircons from the Baima and Taihe peralkaline plutons have weighted average eHf (T) values of +8.7 ± 0.4 and +9.2 ± 1.0, whereas the Woshui and Huangcao metaluminous plutons have differing eHf (T) values (+8.6 ± 0.2 and +5.8 ± 0.3, respectively). Previous studies have suggested that the plutons were derived by differentiation (e.g. fractionation or partial melting) of mafic magmas from an enriched Mantle Source similar to oceanic island basalt with little or no contribution from the crust (eNd (T)  = +1.3 to +3.2, Zr/Nb = 0.9–14.4, Rb/Nb = 0.1–8.4 and Th/Ta =  (T) values of the Woshui and Baima plutons indicates that spatially and temporally associated peralkaline and metaluminous A-type granitic rocks can originate from the same Mantle Source without crustal assimilation.

  • zircon lu hf isotopic compositions of metaluminous and peralkaline a type granitic plutons of the emeishan large igneous province sw china constraints on the Mantle Source
    Journal of Asian Earth Sciences, 2009
    Co-Authors: Gregory J Shellnutt, Meifu Zhou, Christina Yan Wang, Yueheng Yang
    Abstract:

    Abstract Permian A-type granitoids of the Emeishan large igneous province (ELIP) in the Panxi region, SW China, are predominantly peralkaline and metaluminous in composition. In situ zircon Hf isotopic compositions along with whole rock trace element and Nd isotopic data are used to examine the probable Source characteristics of these A-type granitic plutons. Zircons from the Baima and Taihe peralkaline plutons have weighted average eHf(T) values of +8.7 ± 0.4 and +9.2 ± 1.0, whereas the Woshui and Huangcao metaluminous plutons have differing eHf(T) values (+8.6 ± 0.2 and +5.8 ± 0.3, respectively). Previous studies have suggested that the plutons were derived by differentiation (e.g. fractionation or partial melting) of mafic magmas from an enriched Mantle Source similar to oceanic island basalt with little or no contribution from the crust (eNd(T) = +1.3 to +3.2, Zr/Nb = 0.9–14.4, Rb/Nb = 0.1–8.4 and Th/Ta =

Gregory J Shellnutt - One of the best experts on this subject based on the ideXlab platform.

  • zircon lu hf isotopic compositions of metaluminous and peralkaline a type granitic plutons of the emeishan large igneous province sw china constraints on the Mantle Source
    Journal of Asian Earth Sciences, 2009
    Co-Authors: Gregory J Shellnutt, Meifu Zhou, Christina Yan Wang, Yueheng Yang
    Abstract:

    Abstract Permian A-type granitoids of the Emeishan large igneous province (ELIP) in the Panxi region, SW China, are predominantly peralkaline and metaluminous in composition. In situ zircon Hf isotopic compositions along with whole rock trace element and Nd isotopic data are used to examine the probable Source characteristics of these A-type granitic plutons. Zircons from the Baima and Taihe peralkaline plutons have weighted average eHf (T) values of +8.7 ± 0.4 and +9.2 ± 1.0, whereas the Woshui and Huangcao metaluminous plutons have differing eHf (T) values (+8.6 ± 0.2 and +5.8 ± 0.3, respectively). Previous studies have suggested that the plutons were derived by differentiation (e.g. fractionation or partial melting) of mafic magmas from an enriched Mantle Source similar to oceanic island basalt with little or no contribution from the crust (eNd (T)  = +1.3 to +3.2, Zr/Nb = 0.9–14.4, Rb/Nb = 0.1–8.4 and Th/Ta =  (T) values of the Woshui and Baima plutons indicates that spatially and temporally associated peralkaline and metaluminous A-type granitic rocks can originate from the same Mantle Source without crustal assimilation.

  • zircon lu hf isotopic compositions of metaluminous and peralkaline a type granitic plutons of the emeishan large igneous province sw china constraints on the Mantle Source
    Journal of Asian Earth Sciences, 2009
    Co-Authors: Gregory J Shellnutt, Meifu Zhou, Christina Yan Wang, Yueheng Yang
    Abstract:

    Abstract Permian A-type granitoids of the Emeishan large igneous province (ELIP) in the Panxi region, SW China, are predominantly peralkaline and metaluminous in composition. In situ zircon Hf isotopic compositions along with whole rock trace element and Nd isotopic data are used to examine the probable Source characteristics of these A-type granitic plutons. Zircons from the Baima and Taihe peralkaline plutons have weighted average eHf(T) values of +8.7 ± 0.4 and +9.2 ± 1.0, whereas the Woshui and Huangcao metaluminous plutons have differing eHf(T) values (+8.6 ± 0.2 and +5.8 ± 0.3, respectively). Previous studies have suggested that the plutons were derived by differentiation (e.g. fractionation or partial melting) of mafic magmas from an enriched Mantle Source similar to oceanic island basalt with little or no contribution from the crust (eNd(T) = +1.3 to +3.2, Zr/Nb = 0.9–14.4, Rb/Nb = 0.1–8.4 and Th/Ta =

Jian-ping Zheng - One of the best experts on this subject based on the ideXlab platform.

  • sulfide in dunite channels reflects long distance reactive migration of mid ocean ridge melts from Mantle Source to crust a re os isotopic perspective
    Earth and Planetary Science Letters, 2020
    Co-Authors: Qing Xiong, Olivier Alard, Jian-ping Zheng, Yong Xu, Jose Maria Gonzalezjimenez, W L Griffin
    Abstract:

    Abstract The Earth's major heat and mass fluxes are output from the Mantle to surface via mid-ocean-ridge-basalt (MORB) magmatism. The variations of MORBs are determined both by the heterogeneity of Mantle Source and the melt migration processes from Mantle Source to seafloor. However, before the MORB magmas enter crust, the role of the major melt migration passageways within the Mantle (dunite channel systems) in regulating the compositions of MORBs has been rarely evaluated, especially from the perspective of Re-Os isotopes. Here, we report new Re-Os isotopic compositions of base-metal sulfides (BMS), chromites and dunites from dunite lenses with low spinel Cr# [Cr3+/(Cr3++Al3+) ≤0.66] (products of interaction between MORB-like melts and upper-Mantle harzburgites) from the Zedang ophiolite (South Tibet). Rhenium-Os isotopic compositions of low-Cr# dunites from the Samail and Wadi Tayin massifs (typical MOR segments) of the Oman ophiolite are also shown for comparison to reveal the melt plumbing processes at Mantle depths beneath mid-ocean ridges. Mineralogical evidence suggests that the Zedang sulfides and desulfurized alloy portions were originally precipitated as monosulfide solid solutions. The highly variable 187Os/188Os initial ratios (0.1191-0.1702) and low 187Re/188Os ( This study reveals that the long-distance reactive migration of melts from Mantle Source to at least Moho depths can result in strong Re-Os fractionation and isotopic mismatch between primary MORBs and Mantle residues. It also shows that, unlike other lithophile tracers (e.g., Nd-Hf isotopes) whose signatures are almost completely transferred from Mantle Source to crust, the sub-crustal melt plumbing processes beneath mid-ocean ridges can be finely constrained by the multistage evolution of chalcophile and siderophile elements (e.g., Re-Os) and their isotopes (e.g., 187Re-187Os) with sulfides and chromites. Our study supports that the MORB compositions are actually regulated by their reactive migration processes occurred between melt generation at depth and eruption on seafloor.

  • subduction related metasomatic Mantle Source in the eastern central asian orogenic belt evidence from amphibolites in the xilingol complex inner mongolia china
    Gondwana Research, 2017
    Co-Authors: Yilong Li, Fraukje M Brouwer, Wenjiao Xiao, Kuolung Wang, Yuanhsi Lee, Biji Luo, Yuping Su, Jian-ping Zheng
    Abstract:

    Abstract The Central Asian Orogenic Belt (CAOB) formed mainly in the Paleozoic due to the closure of the Paleo-Asian oceanic basins and accompanying prolonged accretion of pelagic sediments, oceanic crust, magmatic arcs, and Precambrian terranes. The timing of subduction–accretion processes and closure of the Paleo-Asian Ocean has long been controversial and is addressed in a geochemical and isotopic investigation of mafic rocks, which can yield important insight into the geodynamics of subduction zone environments. The Xilingol Complex, located on the northern subduction–accretion zone of the CAOB, mainly comprises strongly deformed quartzo-feldspathic gneisses with intercalated lenticular or quasi-lamellar amphibolite bodies. An integrated study of the petrology, geochemistry, and geochronology of a suite of amphibolites from the complex constrains the nature of the Mantle Source and the tectono-metamorphic events in the belt. The protoliths of these amphibolites are gabbros and gabbroic diorites that intruded at ca. 340–321 Ma with positive eHf(t) values ranging from + 2.89 to + 12.98. Their TDM1 model ages range from 455 to 855 Ma and peak at 617 Ma, suggesting that these mafic rocks are derived from a depleted continental lithospheric Mantle. The primitive magma was generated by variable degrees of partial melting of spinel-bearing peridotites. Fractionation of olivine, clinopyroxene and hornblende has played a dominant role during magma differentiation with little or no crustal contamination. The mafic rocks are derived from a Late Neoproterozoic depleted Mantle Source that was subsequently enriched by melts affected by slab-derived fluids and sediments, or melts with a sedimentary Source rock. The Carboniferous mafic rocks in the northern accretionary zone of the CAOB record a regional extensional event after the Early Paleozoic subduction of the Paleo-Asian Ocean. Both addition of Mantle-derived magmas and recycling of oceanic crust played key roles in significant Late Carboniferous (ca. 340–309 Ma) vertical crustal growth in the CAOB. Amphibolite–facies metamorphism (P = 0.34–0.52 GPa, T = 675–708 °C) affected these mafic rocks in the Xilingol Complex at ca. 306–296 Ma, which may be related to the crustal thickening by northward subduction of a forearc oceanic crust beneath the southern margin of the South Mongolian microcontinent. The final formation of the Solonker zone may have lasted until ca. 228 Ma.