Geochronology, geochemistry and Sr–Nd–Pb–Hf isotopes of the Paleoproterozoic mafic dykes from the Wulashan area, North China Craton: Petrogenesis and geodynamic implications

Wang, Liang; Wang, Genhou; Lei, Shibin; Wang, Wei; Min, Qingwen; Jia, Lei; Chang, Chi-Wei; Kang, Jiankun; Hou, Wanrong

doi:10.1016/j.precamres.2016.09.009

Cited by 11 publications

(13 citation statements)

References 136 publications

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“…Compared with the primitive mantle magmas, the low MgO (4.76-5.40 wt%), Ni (56.98-68.64 ppm) and Cr (30-40 ppm) contents and Mg no. value (41-44) of the Yushigou diabase imply that fractional crystallization of mafic minerals, such as olivine and pyroxene, occurred prior to its emplacement (Frey & Prinz, 1978;Wang et al 2016). This result is consistent with the positive correlation of MgO content with FeO total , V and Ni contents (Fig.…”

Section: B2 Fractional Crystallizationsupporting

confidence: 79%

“…9b). The above features imply that the major and trace elements were not obviously affected by crustal contamination (Rudnick & Fountain, 1995;Ma et al 2014;Wang et al 2016). In addition, the samples of the Yushigou diabase have relatively uniform ϵ Nd (t) values (−14.4 to −13.4).…”

Section: B Petrogenesismentioning

confidence: 88%

“…Zircons in mafic rocks are generally characterized by homogenous structures and/or banding and/or weak oscillatory zoning on CL images, while Th/U ratios (generally > 0.6, often > 1.0) are significantly higher than those of granitic igneous zircons (generally between 0.3 and 0.8) (Wang et al 2011(Wang et al , 2016. Based on banded zoning or weak oscillatory zoning structures and high Th/U ratios (0.61-1.16; average, 0.88), the zircon grains from the Yushigou diabase can be ascribed to typical magmatic zircons crystallized from mafic rocks.…”

Section: A Emplacement Agementioning

confidence: 99%

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Geochemistry and zircon ages of the Yushigou diabase in the Longshoushan area, Alxa Block: implications for crust–mantle interaction and tectonic evolution

et al. 2020

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The North Qilian orogenic belt in North China has been defined as a subduction–collision zone between the Alxa Block and the Qilian Block. We present petrography, zircon U–Pb geochronology, major- and trace-element geochemistry, and Sr–Nd–Pb–Hf isotope analysis for the Yushigou diabase from the Longshoushan area, which is located SW of the Alxa Block, aiming to understand its petrogenetic link to subduction processes. The Yushigou diabase belongs to the tholeiite series, and shows enrichment in light rare earth and large-ion lithophile elements, and a depletion in heavy rare earth and high-field-strength elements. Laser ablation – inductively coupled plasma – mass spectrometry U–Pb zircon dating yielded an emplacement age of 414 ± 9 Ma, with an ϵHf(t) value in the range of −10.3 to 1.8. The whole-rock initial 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios of the diabase range over 16.811–17.157, 15.331–15.422 and 37.768–37.895, respectively. The (87Sr/86Sr)i ratios vary between 0.7086 and 0.7106, and ϵNd(t) values vary between −14.4 and −13.4, which are significantly higher than the ϵHf(t) value (Nd–Hf decoupling). An interpretation of the elemental and isotopic data suggests that the Yushigou diabase was derived from partial melting of an enriched mantle I (EM-I) -type lithospheric mantle in the spinel–garnet transitional zone. Based on the geochemical features and previous regional geological data, we propose that the Silurian magmatism was most likely triggered by slab break-off after the closure of the North Qilian Ocean, and ancient continental materials from the subduction slab metasomatized the overlying lithospheric mantle during exhumation.

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Section: B2 Fractional Crystallizationsupporting

confidence: 79%

Section: B Petrogenesismentioning

confidence: 88%

Section: A Emplacement Agementioning

confidence: 99%

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Geochemistry and zircon ages of the Yushigou diabase in the Longshoushan area, Alxa Block: implications for crust–mantle interaction and tectonic evolution

et al. 2020

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“…Wulashan MP pelitic granulite (Cai et al, ); 7. Erdaowua Kyanite‐bearing pelitic schist (Wang et al, ); 8. Daqingshan‐Wulashan HP mafic granulite (Liu et al, 2017); 9.…”

Section: Discussionmentioning

confidence: 99%

“…However, other researchers have proposed that the protoliths of the Khondalite Series rocks were sourced from a continental arc (Dan, Li, Guo, Liu, & Wang, , ; Dong, ; Jiao, ). Associated with the rocks of the Khondalite Series are minor granulite‐facies dioritic–granitic gneisses, amphibolites, mafic granulites, syntectonic charnockites, and S‐type granites (e.g., Lu et al, , ; Jin & Li, ; Qian & Li, ; Zhao, Wilde, Cawood, & Lu, ; Wang et al, ). The granulites occur as small pockets and lenses in the quartzofeldspathic and pelitic gneisses, and they are associated spatially with garnet‐bearing S‐type granites that probably indicate extensive partial melting during the high‐grade metamorphism (Guo, Zhai, & Xu, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

Metamorphic evolution and tectonic significance of ultrahigh‐temperature mafic granulites in the southern part of the Shiguai area, Daqingshan, China

et al. 2019

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Ultrahigh-temperature (UHT) mafic granulites in the southern part of the Shiguai area in Daqingshan, China, crop out within the Shanheyuan Gneiss of the Khondalite Belt (KB), a Paleoproterozoic tectonic belt in the Western Block of the North China Craton (NCC). The UHT mafic granulites occur within hypersthene-bearing dioritic-granitic gneiss as irregular lenses and deformed dike swarms. Four metamorphic generation assemblages (M 1 -M 4 ) are recognized in the studied samples. M 1 is defined by the enclosed orthopyroxene and clinopyroxene within the "red eye" corona of the garnet, representing the prograde metamorphic stage. M 2 (UHT granulite-facies) is marked by the appearance of "red eye" corona of the garnet, with mineral assemblages of grt-cpx-opx-pl-ilm-q. M 3 is defined by spinel-rich symplectites between garnet and orthopyroxene, including grt-opx-pl-spl-mt-ilm. M 4 (amphibolite facies) is featured by the development of amphibole. Phase equilibrium modelling and some critical thermobarometers are combined to constrain the P-T evolution of the studied samples. The P-T conditions for the M 1 -M 4 are respectively estimated at~8 kbar/ 771-852°C,~9.4-10.0 kbar/~930-965°C,~5.0-5.4 kbar/~865-910°C,~5.0-5.2 kbar/~675-682°C, which define a clockwise P-T path, involving nearisothermal decompression following the peak metamorphism. The P-T path indicates that the rocks underwent a sequence of tectonothermal processes that started with crustal thickening (M 1 -M 2 ), followed by rapid crustal uplift (M 3 ) and cooling (M 4 ). This process is inferred that the metamorphism of the UHT mafic granulites was associated with rapid exhumation and uplift that followed the continent-continent collision and amalgamation of the Yinshan and Ordos blocks. This amalgamation formed the Paleoproterozoic KB in the Western Block of the NCC.

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Petrogenesis and tectonic implications of the Early Carboniferous high‐K granites with enriched isotope signatures in the northern North China Craton

Zhang

Jiang

2022

Geological Journal

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Although an extensive continental arc magmatism was recorded in the northern North China Craton (NCC) during the Carboniferous, a general geodynamic model has not been constructed, and associated crust–mantle processes are not fully understood. Here, we carried out systematic geochronological and geochemical investigations on the alkali‐feldspar granite pluton in the Zhaojinggou area, northern NCC. U–Pb dating of high‐U–Th zircons failed to obtain concordant ages due to severe metamictization, while apatite U–Pb dating yielded a perfect age of 327.6 ± 4.1 Ma, indicating the emplacement of granites in the Early Carboniferous. The granites have high SiO2 (74.99–76.88 wt%) and K2O (5.73–6.43 wt%) contents and exhibit enriched LREEs, K, Rb, Th, U, and Pb, and depleted Nb, Ta, P, and Ti contents, which are typical of highly fractionated, I‐type high‐K granites formed under a continental arc setting. Moreover, the high‐K granites show highly enriched Nd isotopic compositions (with whole‐rock and apatite εNd(t) of −33.6 to −16.3) that are distinctly lower than other Carboniferous continental arc rocks in the northern NCC (εNd(t) from −18.5 to −9.9). These geochemical characteristics indicate that the high‐K granites possibly originated by partial melting of the Archean TTG gneisses and mafic rocks in the lower crust. Involvement of mantle‐derived fluids is crucial to induce the low‐temperature melting, and sufficient fractional crystallization was reached during subsequent magmatic evolution. Previous studies suggest that the Carboniferous continental arc rocks in the northern NCC have mantle‐derived or crust–mantle mixed sources. Our study, however, indicates that there also exist coeval crust‐derived magmatic rocks in this area. In combination with previous work and this study, we support the hypothesis that the widespread Carboniferous continental arc magmatism in the northern NCC is related to the southward subduction of the Palaeo‐Asian Ocean (PAO), and the different magma sources and extensive crust–mantle interactions are responsible for the formation of diverse types of magmatic rocks with contrasting isotopic compositions. We also draw attention to the fact that phosphate minerals such as apatite may be a preferable chronometer relative to high‐U–Th zircon in a highly fractionated igneous system.

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Geochronology, geochemistry and Sr–Nd–Pb–Hf isotopes of the Paleoproterozoic mafic dykes from the Wulashan area, North China Craton: Petrogenesis and geodynamic implications

Cited by 11 publications

References 136 publications

Geochemistry and zircon ages of the Yushigou diabase in the Longshoushan area, Alxa Block: implications for crust–mantle interaction and tectonic evolution

Geochemistry and zircon ages of the Yushigou diabase in the Longshoushan area, Alxa Block: implications for crust–mantle interaction and tectonic evolution

Metamorphic evolution and tectonic significance of ultrahigh‐temperature mafic granulites in the southern part of the Shiguai area, Daqingshan, China

Petrogenesis and tectonic implications of the Early Carboniferous high‐K granites with enriched isotope signatures in the northern North China Craton

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