Early Cretaceous continental delamination in the Yangtze Block: Evidence from high-Mg adakitic intrusions along the Tanlu fault, central Eastern China

Jia, Lei; Mo, Xuanxue; Santosh, M.; Yang, Zhen; Yang, Dan; Dong, Guochen; Wang, Liang; Wang, Xinchun; Wu, Xuan

doi:10.1016/j.jseaes.2016.06.001

Cited by 18 publications

(16 citation statements)

References 112 publications

(141 reference statements)

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“…The ore‐related adakitic rocks in central‐eastern China exhibit relatively high MgO, Cr, and Ni contents (Figures S6b–S6d) and have been called “high‐Mg adakitic rocks.” Several models were proposed to explain their high Sr/Y and Mg#, including (i) partial melting of metasomatized mantle (Guo et al, 2007; Martin et al, 2005), (ii) magma mixing or contamination (Guo et al, 2007; Streck & Leeman, 2018), (iii) fractional crystallization of mantle‐derived basaltic magma (J. W. Li et al, 2009; Li et al, 2013), and (iv) melt‐mantle interaction (Gao et al, 2004; Huang et al, 2008; Jia et al, 2016; Wang, Wyman, et al, 2006; Wang, Xu, et al, 2006; Wang, Wyman, Xu, Zhao, et al, 2007; Wang et al, 2015; J. F. Xu et al, 2002; Y. M. Xu et al, 2014; Zhou et al, 2020; Zhu et al, 2014). Partial melting of the metasomatized mantle can be precluded because the ore‐related adakitic rocks in central‐eastern China show higher SiO 2 (56–70 wt.%, Figure S6a) and lower Sr (average 900 ± 500 ppm; Wang, Zhao, et al, 2004; Wang, Wyman, et al, 2006; Wang, Xu, et al, 2006) than those of the mantle‐derived adakitic rocks (SiO 2 < 60 wt.%, Sr = 2051 ± 537 ppm; Martin et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

“…D. Sun et al, 2011;Xie et al, 2012;Yang et al, 2014;C. Zhang et al, 2013, (ii) metasomatized lithosphere mantle followed by AFC processes (J. W. , (iii) relict arc intrusive rocks Liu et al, 2012), (iv) delaminated lowermost crust with a subsequent interaction of the melts with the mantle (Gao et al, 2004;Jia et al, 2016;Zhou et al, 2020;. Determining the origin of these adakitic rocks would provide a significantly improved understanding of how the tectono-magmatic evolution of convergent margins or intracontinent areas may correlate with Cu-Mo-Au mineralization.…”

Section: Introductionmentioning

confidence: 99%

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Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralization‐Related Adakitic Rocks in Central‐Eastern China: New Insights Into their Petrogenesis and Crust‐Mantle Interaction

Fan

Wang

et al. 2020

JGR Solid Earth

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The voluminous Late Mesozoic porphyry ore-related adakitic magmatism in central-eastern China is crucial to understand the deep geodynamic process of the region and controls on porphyry deposit formation globally. Here, we present a novel study of whole-rock MoB isotopes on the mineralization-related adakitic rocks from the Dexing (located in the interior of South China and associated with giant porphyry Cu deposits), and Middle-Lower Yangtze River (MLYR) (host to one of the largest porphyry Cu-Au deposit belts) areas in central-eastern China. The Dexing adakitic rocks have δ 98/95 Mo ranging from −0.31‰ to −0.01‰ and δ 11 B from −17.65‰ to −11.49‰. The adakitic rocks from the MLYR area have δ 98/95 Mo values of −0.5‰ to 0.2‰ and δ 11 B values of −14.48‰ to −9.53‰. The δ 98/95 Mo values of both the Dexing and MLYR samples negatively correlate with the La/Yb and La/Sm ratios. Together with the high Mg#, Cr, and Ni contents, these results indicate a process of melt-mantle interaction resulting in hybridization of initial adakitic melts with low δ 98/95 Mo and mantle-derived melts/components with high δ 98/95 Mo. These adakitic rocks have distinct Mo isotope systematics compared with those of oceanic slab-derived adakites and MORB-type eclogites. Their relatively low δ 11 B values and the lack of correlation between δ 11 B and B contents support a mafic lower crust source for the initial adakitic melts. We thus suggest that these adakitic rocks were generated by partial melting of delaminated lower crust followed by interaction with the deep mantle, and that melt-mantle interaction may facilitate Cu-Mo-Au mineralization.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralization‐Related Adakitic Rocks in Central‐Eastern China: New Insights Into their Petrogenesis and Crust‐Mantle Interaction

Fan

Wang

et al. 2020

JGR Solid Earth

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“…13). Isotopic ages for the adakitic rocks in the Middle-Lower Yangtze River (MLYR, adjacent to the TLFZ in SCB) range from 100-147 Ma with a major peak at 132-138 Ma and a subordinate peak at 144-148Ma (Wang et al, 2007a;Li et al, 2010a, b;Jia et al, 2016). Isotopic ages for the adakitic rocks in the NCC range from 110-130 Ma (Wang et al, 2007b;Wu et al, 2008b).…”

Section: Petrogenesismentioning

confidence: 99%

“…After systematic geological and petrographic research, we analyzed zircon LA-ICP-MS U-Pb isotopic dating, zircon Hf isotopes and whole-rock geochemistry of the representative samples from the two studied intrusions. After combining with published geochemical data from the region and previous studies (Zhu et al, 2004;Hu et al, 2014;Jia et al, 2016), we further restrict the origin of the granitoid intrusions, which provide significant evidence about their petrogenesis of the abundant granitoid intrusions in Feidong district, southern Tan-Lu Fault Zone.…”

Section: Introductionmentioning

confidence: 99%

“…Most previous studies have focused on the genesis of the widelydistributed magmatic rocks, investigating the geochronology, geochemistry and petrogenesis (Niu et al, 2002(Niu et al, , 2008(Niu et al, , 2010Xie, 2008;Shang et al, 2018). Three potential magmatic sources have been proposed for explaining the igneous rocks in the Feidong district: (1) the crustal rocks of the NCC (Xie et al, 2008;Niu et al, 2002Niu et al, , 2008Niu et al, , 2010; (2) the crustal rocks of the SCB (Wang et al, 2013;Hu et al, 2014;Jia et al, 2016); (3) a mix of lower crustal components of the NCC and SCB (Xie et al, 2016). To further identify the petrogenesis in the Feidong district.…”

Section: Introductionmentioning

confidence: 99%

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Geochronology and Petrogenesis of Granitoid Intrusions in the Feidong District, Southern Tan–Lu Fault Zone, China

Zhang

Yao

et al. 2020

Acta Geologica Sinica (Eng)

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The Feidong district is located in the southern segment of the Tan–Lu fault zone that separates the South China Block (NCB) from the North China Craton (NCC). We report zircon U‐Pb geochronology and Hf isotope data, as well as whole‐rock geochemistry for Xishanyi granodiorite and Jianshan granite in the Feidong district. Zircon U‐Pb dating results show that the emplacement ages of the Xishanyi and Jianshan intrusions are 124 ± 3 Ma and 130 ± 1 Ma respectively, coeval with magmatic events linked to large‐scale lithospheric thinning in eastern China. The whole‐rock geochemistry of the Xishanyi and Jianshan intrusions demonstrate that they are peraluminous, high potassium calc‐alkaline I‐type granites with adakitic characteristics. Both intrusions underwent weak crustal assimilation during emplacement. The in situ zircon ∊Hf(t) values of the Xishanyi granodiorites range from –26.4 to –21.8, with TDM2 model ages of 2552 to 2841 Ma. The in situ zircon ∊Hf(t) values of the Jianshan granite are from –27.5 to –23.0 with TDM2 model ages of 2632 to 2904 Ma. The peak age of inherited zircon grains from the Xishanyi granodiorite and the Jianshan granite were ∼2.07 Ga and ∼1.94 Ga, respectively. After compared with the regional magmatism, we suggest that both the Xishanyi and Jianshan granitoid intrusions were derived from partial melting of the NCC lower crust.

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A multi-task deep learning scheme using receiver functions to study crustal tectonics and its application to the middle-southern segment of Tanlu Fault Zone and adjacencies

Chen

Wang

et al. 2022

Preprint

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We propose a novel scheme that applies a multitasking convolutional neural network to learn the back azimuthal behavior from receiver function seismograms, which can effectively predict the depth and occurrence of the Moho beneath a single seismic station. Our scheme consists of three main steps: 1. Based on the style transfer technique, we generate 9000 synthetic receiver function seismograms blended by realistic noise as training data sets. 2. A multitasking convolutional neural network is trained to predict the depth and occurrence of the Moho. 3. All real receiver function seismograms are reconstructed by the accelerated joint iterative method before prediction. We apply the scheme to study the middle-southern of the Tanlu fault zone and adjacent regions and successfully achieve the depth and occurrence of the Moho beneath 10 permanent seismic stations. The predicted depths are in agreement with the results computed by conventional methods, and the predicted strikes and dip angles present an undulating Moho with near NE-striking. Moreover, the predicted strikes are nearly consistent with the strikes of the normal faults in the upper crust, which implies that intense continental extension in the Cretaceous play a prominent role in the tectonic deformation of the brittle upper crust and the ductile lower crust simultaneously. Besides, it helps to illustrate that the stress field orientation of the major geological event can be recorded and preserved in the lower crust.

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Early Cretaceous continental delamination in the Yangtze Block: Evidence from high-Mg adakitic intrusions along the Tanlu fault, central Eastern China

Cited by 18 publications

References 112 publications

Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralization‐Related Adakitic Rocks in Central‐Eastern China: New Insights Into their Petrogenesis and Crust‐Mantle Interaction

Molybdenum and Boron Isotopic Compositions of Porphyry Cu Mineralization‐Related Adakitic Rocks in Central‐Eastern China: New Insights Into their Petrogenesis and Crust‐Mantle Interaction

Geochronology and Petrogenesis of Granitoid Intrusions in the Feidong District, Southern Tan–Lu Fault Zone, China

A multi-task deep learning scheme using receiver functions to study crustal tectonics and its application to the middle-southern segment of Tanlu Fault Zone and adjacencies

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