Geochemistry of Middle Triassic gabbros from northern Liaoning, North China: origin and tectonic implications

Zhang, Xiaohui; Zhang, Hongfu; Zhai, Mingguo; Wilde, Simon A.; Xie, Lie‐Wen

doi:10.1017/s0016756808005530

Cited by 33 publications

(24 citation statements)

References 65 publications

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“…6a, b), and depleted in HFSEs (e.g. Furthermore, the hornblende-rich character of the QZ and HC gabbros is reminiscent of the highlevel hornblende-rich mafic intrusions in the Mesozoic Sierra Nevada batholith (Sisson, Grove & Coleman, 1996), indicating that the parental magma was rich in H 2 O and arguably derived from an arc-related source mantle (Wang, 2002;Zhang et al 2009). 6c, d), strongly suggesting a subduction zone origin/arc affinity (Pearce, 1983).…”

Section: Implications For the Geological Evolution Of Coastal Areas Imentioning

confidence: 99%

Geochronological, geochemical and Sr–Nd–Hf isotopic constraints on petrogenesis of Late Mesozoic gabbro–granite complexes on the southeast coast of Fujian, South China: insights into a depleted mantle source region and crust–mantle interactions

Qiu

2011

Geol. Mag.

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The Quanzhou (QZ) and Huacuo (HC) gabbro-granite complexes on the southeast coast of Fujian, South China, are important components of a Late Mesozoic calc-alkaline volcanic-plutonic belt in the region. The complexes provide an excellent opportunity to investigate the genetic relationships between acid and basic magmas, and their interactions within the intrusive environment. The complexes are composed mainly of monzogranite and biotite granodiorite in the QZ complex, and biotite granite in the HC complex, with lesser amounts of hornblende gabbro. Zircon U-Pb dating provides consistent crystallization ages of 109 ± 1 Ma and 108 ± 1 Ma for the QZ gabbros and monzogranites, and an age of 111 ± 1 Ma for the HC gabbro, which is contemporaneous with the spatially associated HC granites. Both the mafic and felsic intrusions in these complexes are enriched in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs), and are depleted in high-field-strength elements (HFSEs; e.g. Nb and Ta). They show similarly homogeneous Sr-Nd isotopic compositions. All these factors indicate a close genetic relationship between the gabbroic and granitic rocks in the QZ and HC complexes. Although the enriched Sr-Nd isotopic signatures of the QZ and HC gabbros seemingly point to an enriched mantle source (EM-1), they have highly variable zircon Hf isotopic compositions, with ε Hf (t) values ranging from negative to positive (specifically -4.6 to +6.1 for the QZ gabbros and -4.8 to +11.6 for the HC gabbros). We interpret the parental basic magmas of these gabbros to have received contributions from a depleted mantle source and crustal components. Contributions from such a depleted mantle source resulted in the growth of juvenile basaltic lower crust, the partial melting of which generated the parental felsic magmas of the QZ and HC complexes. Furthermore, based on a synthesis of petrography, geochronology, elemental and isotopic geochemistry and tectonics, we propose that break-off and rollback of the Late Mesozoic subducted Palaeo-Pacific Plate triggered the upwelling of asthenospheric mantle below the coastal area of the South China Block, which induced extension of the overlying continental lithosphere, and finally initiated the large-scale Late Yanshanian magmatism in the study area.

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Section: Implications For the Geological Evolution Of Coastal Areas Imentioning

confidence: 99%

Geochronological, geochemical and Sr–Nd–Hf isotopic constraints on petrogenesis of Late Mesozoic gabbro–granite complexes on the southeast coast of Fujian, South China: insights into a depleted mantle source region and crust–mantle interactions

Qiu

2011

Geol. Mag.

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“…Early–Middle Triassic igneous rocks are widespread within the eastern end of the NCC northern margin and include mafic to felsic volcanic and intrusive rocks (Cao et al, ; Li et al, ; Wang, Xu, et al, ; Yang et al, ; Zhang et al, , , ) that form an E–W trending belt (Tang et al, ; Zhang et al, ). In contrast, only minor Early–Middle Triassic granitoids occur along the eastern segment of the CAOB, mainly distributed in Yanbian Area (Tang et al, , and references therein; Wu et al, , and references therein; Yang et al, ; Yang, Wu, Liu, et al, ; Yang, Wu, Wilde, et al, ; Zhang et al, , and references therein).…”

Section: Discussionmentioning

confidence: 99%

“…Zircon grains from Phanerozoic igneous rocks in the eastern CAOB yield positive ε Hf ( t ) values (Cao et al, ; Guo et al, ; Yang et al, ), whereas those from NCC igneous rocks yield negative values (Yang et al, ; Zhang et al, ). Coeval and older mafic rocks that were derived from the lithospheric mantle yield negative ε Hf ( t ) values (Zhang et al, , ; Zhu et al, ). In contrast, zircon grains from the Late Triassic trachyandesites yield positive ε Hf ( t ) values (+3.8 to +7.9), indicating that they were incorporated in, and interacted with, a high‐ ε Hf ( t ) magma.…”

Section: Discussionmentioning

confidence: 99%

Final Closure of the Paleo‐Asian Ocean and Onset of Subduction of Paleo‐Pacific Ocean: Constraints From Early Mesozoic Magmatism in Central Southern Jilin Province, NE China

Wang

Xing

et al. 2019

JGR Solid Earth

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When the Paleo‐Asian Ocean closed and the Paleo‐Pacific subduction started in NE China remains controversial. To constrain these key issues, we carried out zircon U‐Pb‐Hf isotopic and whole‐rock geochemical studies of Early Mesozoic igneous rocks in central southern Jilin Province, NE China. Early Mesozoic igneous rocks in region were formed at three stages: the middle Triassic (246 Ma), the late Triassic (219–220 Ma), and the early Jurassic (172–194 Ma). Middle Triassic trachyandesites in southern Jilin Province were solely generated through partial melting of ancient lower crust of the North China Craton (NCC), implying ongoing southward subduction of Paleo‐Asian Ocean Plate beneath the NCC at this time. Late Triassic trachyandesites in southern Jilin Province were derived from the magma mixing/mingling of the NCC lithospheric mantle and juvenile eastern Central Asian Orogenic Belt crustal sources. Late Triassic hornblende gabbros in central Jilin Province were derived from depleted lithospheric mantle previously metasomatized by subduction‐related fluids. Coeval adakitic granodiorites were likely produced through the partial melting of thickened juvenile lower crust. Spatially, these rocks occurred on both sides of the Solonker‐Xra‐Moron‐Changchun Suture Zone and record N–S directed extension accompanied by the final closure of the Paleo‐Asian Ocean. Early Jurassic andesites were produced through mixing/mingling between partial melts derived from eastern Central Asian Orogenic Belt lithospheric mantle and ancient NCC crust. In contrast, Early Jurassic felsic rocks, including A‐type granites, were derived from the partial melting of Neoproterozoic accreted lower crust, jointly implying an extensional setting as the result of the initial subduction from Paleo‐Pacific Plate at this time.

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“…Zhang et al, 2009aS.H. Zhang et al, , 2009b and in adjacent regions of the CAOB X.H. Zhang et al, 2009;Zhang et al, 2010b).…”

Section: Tectonic Implicationsmentioning

confidence: 99%

Late Permian appinite–granite complex from northwestern Liaoning, North China Craton: Petrogenesis and tectonic implications

Zhang

Xue

Yuan

et al. 2012

Lithos

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Geochemistry of Middle Triassic gabbros from northern Liaoning, North China: origin and tectonic implications

Cited by 33 publications

References 65 publications

Geochronological, geochemical and Sr–Nd–Hf isotopic constraints on petrogenesis of Late Mesozoic gabbro–granite complexes on the southeast coast of Fujian, South China: insights into a depleted mantle source region and crust–mantle interactions

Geochronological, geochemical and Sr–Nd–Hf isotopic constraints on petrogenesis of Late Mesozoic gabbro–granite complexes on the southeast coast of Fujian, South China: insights into a depleted mantle source region and crust–mantle interactions

Final Closure of the Paleo‐Asian Ocean and Onset of Subduction of Paleo‐Pacific Ocean: Constraints From Early Mesozoic Magmatism in Central Southern Jilin Province, NE China

Late Permian appinite–granite complex from northwestern Liaoning, North China Craton: Petrogenesis and tectonic implications

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