Early Cretaceous potassic volcanic rocks in the Jiangnan Orogenic Belt, East China: Crustal melting in response to subduction of the Pacific–Izanagi ridge?

Zhao, Liang; Guo, Feng; Wu, Fan; Zhang, Qingwen; Wu, Yinong; Li, Jingyan; Yan, Wen

doi:10.1016/j.chemgeo.2016.05.011

Cited by 35 publications

(19 citation statements)

References 84 publications

(149 reference statements)

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“…Extensive extrusive and intrusive magmatic activity occurred in the GHB during the Early Cretaceous for available Ar‐Ar, K‐Ar, and zircon U‐Pb data defining an age peak at ca. 130 Ma (Hu et al, ; Jiang et al, , ; Peng et al, ; Qi et al, , ; Shu et al, ; Sun et al, ; Wong et al, ; Xia et al, ; Xiang et al, ; Yang et al, ; L. Zhao et al, ; Zhou et al, ). The mafic magmatic rocks in the GHB are characterized by variable isotopic compositions [( 87 Sr/ 86 Sr) i = 0.70354–0.71086; ε Nd ( t ) = −10.4 to +6.6; Table S6 in the supporting information; Jiang et al, ; Qi et al, , ; Shu et al, ; Xia et al, ].…”

Section: Geological Setting and Petrographymentioning

confidence: 99%

Magma Mixing in a Granite and Related Rock Association: Insight From Its Mineralogical, Petrochemical, and “Reversed Isotope” Features

Jiang

Xia

et al. 2018

JGR Solid Earth

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Magma mixing commonly takes place between isotopically depleted mafic and enriched felsic magmas. Here we present isotopic evidence exhibiting the opposite behavior in the Early Cretaceous Siling complex (south China), which is composed of gabbro, quartz diorite, granodiorite, and alkali feldspar granite with locally many mafic microgranular enclaves. Field observations and zircon U‐Pb dating indicate that all of the rock units crystallized contemporaneously at ca. 127–129 Ma. Mineralogical and petrochemical analyses indicate that the Siling quartz diorite and granodiorite crystallized from hybrid magmas of temporally and spatially coexisting gabbroic and granitic melts. The Siling gabbro, characterized by variable yet enriched Sr‐Nd‐Hf isotopic compositions [(87Sr/86Sr)i = 0.70788 to 0.70833; ɛNd(t) = −7.6 to −3.5; ɛHf(t) = −6.8 to −1.9], exhibits Th/Nb, Nb/Nb*, and Sm/Yb versus εNd(t) correlations, indicating that the gabbro represents variable mixing of magmas derived from deep‐level pyroxenite and shallow‐level peridotite sources. The Siling alkali feldspar granite, which has typical A‐type characteristics, exhibits less enriched Sr‐Nd‐Hf isotopic signatures [(87Sr/86Sr)i = 0.70650; εNd(t) = −3.2 to −2.5; ɛHf(t) = −1.3] than the coexisting gabbro, indicating its derivation from the remelting of juvenile lower crust. “Reversed isotope” feature of the Siling gabbro and alkali feldspar granite means that the quartz diorite and granodiorite recorded “reversed isotope” mixing between isotopically enriched mafic and relatively depleted felsic magmas. The results indicate that the injection of mantle‐derived mafic magma does not necessarily imprint relatively depleted isotopic signatures on the host felsic melt and that the vertical growth of the continental crust by the input of isotopically enriched magma should be concerned.

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Section: Geological Setting and Petrographymentioning

confidence: 99%

Magma Mixing in a Granite and Related Rock Association: Insight From Its Mineralogical, Petrochemical, and “Reversed Isotope” Features

Jiang

Xia

et al. 2018

JGR Solid Earth

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“…The Qinling‐Dabie‐Sulu Orogen is located to the north margin of the SCB, which is adjoined to the Indosinian Block by the Red River Fault to the southwest (Li, Santosh, Zhao, Zhang, & Jin, ; K. Qiu & Deng, ; K. Qiu, Marsh, Yu, Pfaff, Gulbransen, Gou, & Li, ; K. Qiu et al, ). The Yangtze and Cathaysia blocks were amalgamated together to form the united SCC during the late Neoproterozoic (D. Xu et al, ; Yao, Shu, & Santosh, ; Yao, Shu, Santosh, & Li, ; Yao, Shu, Cawood, & Li, ; Yin et al, ; L. Zhao, Guo, et al, ; K. Zhao, Jiang, et al, ). However, during the later Neoproterozoic and early‐middle Ordovician, the SCB split again, resulting in a complex intracontinental rift arrangement (K. Qiu et al, ).…”

Section: Regional Geologymentioning

confidence: 99%

“…Abundant syntectonic granite intrusions are distributed in the deeper basement at the center of the Yunkai Massif, including charnockite intrusions with zircon U–Pb ages ranging from 448 to 405 Ma (C. Chen et al, ; Lin, Wang, & Chen, ; D. Wang et al, ; Figure ). The Indosinian magma mainly produced a series of Al‐rich granites (including cordierite and garnet), which are generally NE–SW‐trending along the western side of the Luchuan‐Cenxi Fault and the eastern side of the Wuchuan‐Sihui Fault; their zircon U–Pb ages mainly range from 242 to 220 Ma (C. Chen et al, ; L. Zhao, Guo, et al, ; K. Zhao, Jiang, et al, ; Zhong et al, ; Figure ). The Yanshanian intrusions are mainly distributed along the Wuchuan‐Sihui Fault (Lin et al, ).…”

Section: Regional Geologymentioning

confidence: 99%

“…Qiu et al, 2018). The Yangtze and Cathaysia blocks were amalgamated together to form the united SCC during the late Neoproterozoic (D. Xu et al, 2017;Yao, Shu, & Santosh, 2014;Yao, Shu, Santosh, & Li, 2015;Yao, Shu, Cawood, & Li, 2016;Yin et al, 2013;L. Zhao, Guo, et al, 2016;K.…”

Section: Regional Geologymentioning

confidence: 99%

“…Wang et al, 2013; Figure 1). The Indosinian magma mainly produced a series of Al-rich granites (including cordierite and garnet), which are generally NE-SW-trending along the western side of the Luchuan-Cenxi Fault and the eastern side of the Wuchuan-Sihui Fault; their zircon U-Pb ages mainly range from 242 to 220 Ma (C. Chen et al, 2017;L. Zhao, Guo, et al, 2016;K.…”

Section: Regional Geologymentioning

confidence: 99%

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Ductile shear deformation and gold mineralization in the Hetai goldfield of the Yunkai Massif, South China Block

Liu

Wang

et al. 2019

Geological Journal

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The Hetai goldfield, located at the northern edge of the Yunkai Massif in South China, is a significant gold deposit hosted within the Hetai ductile shear zone (HSZ). The deformation history of HSZ and its correlation with the gold mineralization are problematic. In this study, we conducted detailed field observations and microstructure analyses together with zircon U–Pb and muscovite 40Ar/39Ar geochronology on mylonitic granites, aiming to study the deformation features and processes of the ductile shear zone (DSZ) along with their further implications to the gold metallogenic mechanisms of the Hetai goldfield (HGF). The HGF and its periphery have undergone three phases of ductile shear event (DS) since the Palaeozoic: The first DS developed from 468 to 413 Ma, with deformation temperatures above 500°C, accompanied by the formation of large‐scale migmatite and magmatism. The second DS developed from 239 to 211 Ma, with deformation temperatures ranging from 400°C to 500°C and resulted in a low‐angle, top‐to‐the‐SE thrusting. The third DS developed from 198 to 162 Ma, with deformation temperatures between 300°C and 400°C and formed steep, dextral strike‐slip shear zones. The DSs in the HGF have close connection with the gold mineralization. The first DS is coeval with the small‐scale gold mineralization or sulfofication and laid the foundation for later large‐scale gold mineralization. The second DS had no obvious gold mineralization, but the DSZ that developed in this period, together with the earlier DSZs, may have provided a migration pathway for the later gold ore‐forming fluid. Occurrence of the third DS was combined with the main gold mineralization, but the large‐scale gold mineralization mainly occurred during 175–157 Ma, that is, the middle and later periods of dextral strike‐slip. Overall, multiphase DS dominated the large‐scale gold mineralization in this area.

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Timing of the initiation and duration of the Cretaceous extensional regime in South‐east China: Constraints from growth strata in terrigenous basins

Yu,

Hu,

et al. 2023

The Depositional Record

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There has been no consensus yet regarding the precise initial timing and duration of the late Mesozoic extensional tectonics in the South‐eastern China Block. This work focusses on the growth strata of the Early Cretaceous red beds in the South‐eastern China Block to determine the late Mesozoic tectonics and the precise timing of the initiation and duration of extensional tectonics in this area. Field observation of several terrigenous basins shows that the dip angles of the Cretaceous red beds have varied from moderate to gentle from basin edges to interiors (or centres). The visible and estimated thickness within a single bed increases slightly downwards from the upper to the lower part. These characteristics indicate that the sedimentary area of these beds has undergone an extensional process with expansion and deepening of the sedimentary basins. Rotation of the border surfaces (limbs) and downward warping of the hanging walls or retreat of the footwalls of listric normal faults causes three types of extensional growth (or syntectonic) strata in the deposits of different basins. Dating of the volcanic rocks related to the growth beds reveals that the sedimentary basins were enlarged and deepened when the Early Cretaceous strata were deposited in the South‐eastern China Block from ca 140 to 137 Ma. Regionally, under the influence of Palaeo‐Pacific plate rollback since ca 140 Ma, the South‐eastern China Block stress field has led to lithospheric uplift and pull‐apart structures near the surface, causing the half‐graben basins to receive sedimentation. Although the extensional event was interrupted by a short compressional event during 120 to 105 Ma, with the oceanward retreat of the trench, the area of extension gradually enlarged and rejuvenated south‐eastwards until the end of the Cretaceous. This Cretaceous extension event of the South‐eastern China Block must belong to a worldwide geological event with global significance.

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Early Cretaceous potassic volcanic rocks in the Jiangnan Orogenic Belt, East China: Crustal melting in response to subduction of the Pacific–Izanagi ridge?

Cited by 35 publications

References 84 publications

Magma Mixing in a Granite and Related Rock Association: Insight From Its Mineralogical, Petrochemical, and “Reversed Isotope” Features

Magma Mixing in a Granite and Related Rock Association: Insight From Its Mineralogical, Petrochemical, and “Reversed Isotope” Features

Ductile shear deformation and gold mineralization in the Hetai goldfield of the Yunkai Massif, South China Block

Timing of the initiation and duration of the Cretaceous extensional regime in South‐east China: Constraints from growth strata in terrigenous basins

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