Structural characteristics and geochronology of migmatites in the North Dabie Complex unit: Timing of post-collisional deformation

Wang, Yongsheng; Bai, Qiao; Yang, Bingfei

doi:10.1007/s11430-017-9189-6

Cited by 10 publications

(15 citation statements)

References 61 publications

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“…This is evidenced by the presence of mineral assemblages of amphibole + biotite + plagioclase, and highgrade mineral shape fabrics such as feldspar fish (Figure 7B) and independent GBM recrystallization of quartz grains. In addition, the dominant operation of prism <a> slip for the deforming quartz, as indicated by the crystallographic fabric of quartz C-axis, further support the higher temperature conditions for this non-coaxial flow (Ratschbacher et al, 2000;Law, 2014;Wang et al, 2018).…”

Section: Top-to-the-nw Non-coaxial Ductile Flow Domainmentioning

confidence: 57%

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Early cretaceous multi-stage extension in the North Dabie complex in the eastern central China: insights from structural and geochronological data

Huang,

Yan,

Xiao

et al. 2024

Front. Earth Sci.

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A dominantly NW-SE directed extensional tectonics in the Early Cretaceous significantly reworked the Late Permian-Triassic orogenic framework of the Dabie orogenic belt. The North Dabie complex (NDC) is the principal domain recording this tectonic event. However, the precise structure-kinematic architectures, particularly those observed in the ductile regime, along with the respective time scales for different extensional stages, have not been adequately established. This significantly impedes our comprehensive understanding of the extensional style and deformation history in the North Dabie complex. To better address these issues, we conducted a systematic structural study and LA-ICP-MS zircon U-Pb dating of the pre-, syn-, and post-kinematic intrusions and syn-kinematically metamorphosed high-grade gneisses/migmatites of the NDC. Our results demonstrate that the extensional deformation in the NDC may initiate at ca. 144 Ma, which is characterized by a pervasive NW-SE oriented coaxial plastic flow in the ductile regime of the middle-lower crust. A large-scale detachment processing zone subsequently started activating at ca. 140 Ma at the upper-middle level of the middle crust, and concentratedly accommodated the extensional strain by top-to-NW ductile shearing. Locally, there was uprising of sub-magmatic flow in the atatexite-diatexite from the deeper lower crust taking place in the manner of top-to-outward shearing as early as ca. 137 Ma. This composite process of extension manifests vertical strain partitioning across the ductile middle-lower crusts and progressive strain localization during the lithospheric thinning. The NW-SE orientation dominated extensional tectonics was strongly driven by the westward subduction of the Paleo-Pacific oceanic plate during the Late Mesozoic.

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Section: Top-to-the-nw Non-coaxial Ductile Flow Domainmentioning

confidence: 57%

“…The HP-UHP orogenic belt of the DOB was significantly reworked by extensional tectonics in the Early Cretaceous. (Faure and Lin, 1998;Ratschbacher et al, 2000;Wu et al, 2007a;Wang et al, 2007;Deng et al, 2014;Zhang et al, 2014;Lin et al, 2015;Wang et al, 2018;Yang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Early cretaceous multi-stage extension in the North Dabie complex in the eastern central China: insights from structural and geochronological data

Huang,

Yan,

Xiao

et al. 2024

Front. Earth Sci.

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“…The southern segment of the Zhangbaling uplift is composed mainly of about 680Ma‐old Neoproterozoic Feidong metamorphic complex rock (Zhao T et al, 2014; Zhang DB et al, 1995). The Dabie orogeny, only about ten kilometers to the southwest of this area and also with high shear wave velocity, is composed primarily of Precambrian metamorphic rocks, mixed with high pressure and ultrahigh pressure metamorphic rocks formed by the orogeny and some Yanshanian and Mesozoic magmatic rocks (Wang YS et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Previous surface geological investigations and studies have focused mainly on the following subjects: Dabie orogen (Wang YS et al, 2004, 2018), Hefei Basin (Liu GS et al, 2006), the tectonic characteristics and evolution history of different segments of the Tan‐Lu fault zone on a relatively large scale (Chen et al, 2007; Hou MJ et al, 2006; Huang Y et al, 2011; Gu QP et al, 2016; Zhang JD et al, 2010; Zhao T et al, 2016), surface wave phase velocity and shear wave velocity models beneath the Dabie orogen (Luo YH et al, 2012), short‐period array ambient noise tomography for the shallow crustal structure of the Feidong segment of the Tan‐Lu fault zone (Gu N et al, 2019), the controlling effect of fault belt on the Hefei Basin (Liu GS et al, 2002, 2006; Lu GM et al, 2002; Song CZ et al, 2003), the evolution and geologic features of the Luzong volcanic rock basin (Yuan F et al, 2008; Dong SW et al, 2009; Tang JF et al, 2010), and velocity structure tomography of the shallow and deep structures in the middle‐lower Yangtze River metallogenic belt (Ouyang LB et al, 2015; She YY et al, 2018; Tian XF et al, 2018; Luo S et al, 2019). These previous studies have concentrated primarily on geochemical topics or characteristics of the resources in some mining areas, and on fine structure exploration and interpretation of the top few hundred meters in a very small area (e.g., Tao SZ and Liu DL, 2000).…”

Section: Introductionmentioning

confidence: 99%

3-D shear wave velocity structure in the shallow crust of the Tanlu fault zone in Lujiang, Anhui, and adjacent areas, and its tectonic implications

Li¹,

Yao²,

Yang³

et al. 2020

Earth and Planetary Physics

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Key Points:Ambient noise tomography reveals high-resolution shallow crustal structures of the Tan-Lu fault zone in Lujiang q Strong velocity anomalies exist in the Hefei basin, the Tan-Lu fault zone, and the Dabie orogenic belt q The high-speed intrusive rocks may come from the Luzong volcanic rock basin through the fractured fault zone q Citation: (2020). 3-D shear wave velocity structure in the shallow crust of the Tan-Lu fault zone in Lujiang, Anhui, and adjacent areas, and its tectonic implications. Earth Planet. Phys., 4(3), 317-328. Abstract:The Tan-Lu fault zone is a large NNE-trending fault zone in eastern China. Investigations of the structures of the fault zone and its surrounding areas have attracted much attention. In this study, we used dense-array ambient noise tomography to construct a threedimensional shear wave velocity model of shallow crust in an area about 80km × 70km in Lujiang, Anhui Province, eastern China. For approximately one month we collected continuous ambient noise signals recorded by 90 short-period seismographs in the region, and obtained the short-period Rayleigh wave empirical Green's functions between stations by the cross-correlation method; we also extracted 0.5-8 s fundamental mode Rayleigh wave group velocity and phase velocity dispersion curves. Based on the direct surface wave tomography method, we jointly inverted the group velocity and phase velocity dispersion data of all paths and obtained the 3-D shear wave velocity structure in the depth range of 0-5 km. The results revealed important geological structural features of the study area. In the north region, the sedimentary center of the Hefei Basin -the southwestern part of the Chaohu Lake -shows a significant low-velocity anomaly to a depth of at least 5 km. The southwestern and southeastern regions of the array are the eastern margin of the Dabie orogenic belt and the intrusion area of Luzong volcanic rocks, respectively, and both show obvious high-speed anomalies; the sedimentary area within the Tan-Lu fault zone (about 10 km wide) shows low-velocity anomalies. However, the volcanic rock intrusion area in the fault zone is shown as high velocity. Our shallow crustal imaging results reflect the characteristics of different structures in the study area, especially the high-speed intrusive rocks in the Tan-Lu fault zone, which were probably partially derived from the magmatic activity of Luzong volcanic basin. From the Late Cretaceous to Early Tertiary, the Tan-Lu fault zone was in a period of extensional activity; the special stress environment and the fractured fault zone morphology provided conditions for magma in the Luzong volcanic basin to intrude into the Tan-Lu fault zone in the west. Our 3-D model can also provide important information for deep resource exploration and earthquake strong ground motion simulation.

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“…The NDDU is characterized geometrically as a group of migmatitic domes. Lithologically, it is composed of banded tonalitic and granitoid gneisses along with postcollisional granitic and mafic-ultramafic intrusions (Hacker et al, 2004;Liu et al, 2011a;Wang et al, 2018). Its tectonic origin is still the subject of debate and various models have been proposed: a Paleozoic magmatic arc on the Sino-Korean plate (Zhai et al, 1994), a Cretaceous extensional terrane (Hacker et al, 1998), an uplifted piece of subducted Yangtze plate crust that experienced high/ ultrahigh-pressure metamorphism (Xu et al, 2003;Liu et al, 2011b;Groppo et al, 2015), an extension of the Yangtze craton that was unaffected by ultrahigh-pressure metamorphism (Bryant et al, 2004).…”

Section: Geological Settingmentioning

confidence: 99%

The Geological Significance of the Deformation and Geochronology of the Xiaotian–Mozitan Shear Zone in the Dabie Orogenic Belt (East‐Central China)

Huang

Song

Xiao

et al. 2021

Acta Geologica Sinica (Eng)

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The Xiaotian-Mozitan Shear Zone (XMSZ) is the boundary between the North Huaiyang Tectonic Belt and the Dabie High-grade Metamorphic Complex (DHMC). It trends WNW-ESE and extends more than 170 km from Qingshan Town in Anhui's Jinzhai County in the west, via Mozitan Town in Huoshan County, to Xiaotian Town in Shucheng County, truncated by the Tan-Lu Fault in Tongcheng County in the east. This shear zone plays a key role in understanding the evolution of the Dabie Orogenic Belt (DOB) because of its close correlation with the DOB

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Structural characteristics and geochronology of migmatites in the North Dabie Complex unit: Timing of post-collisional deformation

Cited by 10 publications

References 61 publications

Early cretaceous multi-stage extension in the North Dabie complex in the eastern central China: insights from structural and geochronological data

Early cretaceous multi-stage extension in the North Dabie complex in the eastern central China: insights from structural and geochronological data

3-D shear wave velocity structure in the shallow crust of the Tanlu fault zone in Lujiang, Anhui, and adjacent areas, and its tectonic implications

The Geological Significance of the Deformation and Geochronology of the Xiaotian–Mozitan Shear Zone in the Dabie Orogenic Belt (East‐Central China)

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