Geochronological and geochemical evidence for the nature of the Dongling Complex in South China

Zhang, Shao‐Bing; He, Qiang; Zheng, Yong‐Fei

doi:10.1016/j.precamres.2014.10.013

Cited by 33 publications

(9 citation statements)

References 94 publications

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“…In the literature, the spatial range of the Jiangnan orogen was hypothesized either as a fault between the Cathaysia Block and the Yangtze Block or as a narrow orogen along the Nanhua Rift with its southeastern margin marked by the Jiangshan-Shaoxing Fault in the east and the Chenzhou-Linwu Fault in the west (e.g., Guo et al, 1985;Zhao and Cawood, 2012;Mao et al, 2013). Nevertheless, the latest studies indicate that the northern margin of the Jiangnan orogen may be extended to the Jiujiang-Shitai Fault and the Ningzhen Mountains in the MLYV of Hubei, Jiangxi, Anhui and Jiangsu provinces and its western margin is extended to the western margin of the Xuefengshan orogen in Jiangxi, Hunan, Guangxi and Guangdong provinces (He et al, 2013;Wang et al, 2013;Yao et al, 2014;Zhang et al, 2015). Li (1994) However, it is well demonstrated that the Dabie-Sulu orogenic belt marks the Triassic continental collision between the North and South China Blocks (Ernst et al, 2007;.…”

Section: Tectonic Setting Of the Mlyvmentioning

confidence: 99%

Geochemical constraints on the origin of Late Mesozoic andesites from the Ningwu basin in the Middle–Lower Yangtze Valley, South China

Chen

Zheng

Zhao

2016

Lithos

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An integrated study of zircon U-Pb ages, Hf-O isotopes, whole-rock major-trace elements and Sr-Nd-Hf isotopes was carried out for Mesozoic andesites from the Ningwu basin in the Middle-Lower Yangtze Valley, South China. The results not only provide insights into the origin of anorogenic magmatism in the Middle-Lower Yangtze Valley but also shed light on the petrogenesis of continental arc andesites in general. The Ningwu andesites are mainly composed of trachyandesite and trachyte, with subordinate of basaltic trachy-andesites. They exhibit variable and low MgO contents of 0.1-3.7 wt.% and low Mg# values of 1.6-51.2, high K 2 O contents of 2.0-9.9 wt.%. They are characterized by arc-like trace element distribution patterns, with significant enrichment in LILE and LREE but depletion in HFSE. Furthermore, these rocks exhibit relatively enriched whole-rock Sr-Nd-Hf-Pb isotope compositions, with initial 87 Sr/ 86 Sr ratios of 0.7050 to 0.7082, negative ε Nd (t) values of-8.1 to-1.8 and negative ε Hf (t) values of-6.7 to 0.4. Zircon U-Pb dating yields consistent ages of 128±2 to 133±2 Ma for magma emplacement through volcanic eruption. The zircon exhibits slightly high  18 O values of 5.7 to 7.8 ‰ and variable ε Hf (t) values of-5.8 to 0.7. The all andesites can be categorized into two groups in view of their distinct geochemical compositions, an integrated interpretation of which allows deciphering of their petrogenesis. Group I andesite was produced by a relatively larger extent of partial melting of a more fertile and enriched mantle source that contains a greater amount of phlogopite, whereas Group II andesite was generated by a relatively smaller extent of partial melting of a less fertile and enriched mantle source that contains a less amount of phlogopite. In either case, these two mantle sources are less ultramafic in lithochemistry than normal mantle peridotite due to its reaction with metasediment-derived hydrous felsic melts. This metasomatism would take place during subduction of the Cathaysia oceanic crust beneath the Yangtze Craton in the Neoproterozoic, whereas the Mesozoic mafic magmatism in the Middle-Lower Yangtze Valley is essentially caused by reactivation of the fertile and enriched mantle sources due to lithospheric extension in response to the subduction of Pacific plate beneath the eastern China continent. Therefore, the geochemical compoisiton of andesitesis primarilythat of mantle sources that were generated by reaction of the mantle wedge peridotite with hydrous felsic melts originated from the subducted terrigenous sediment in Andean-type subduction zones, though such sources may be partially melt either immediately following generation or at a later time. Late-stage magma evolution processes such as fractional crystallization and magma mixing would have further modified the lithochemical composition of andesitic rocks, but they are not the governing factors for their trace element and radiogenic isotope compositions.

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Section: Tectonic Setting Of the Mlyvmentioning

confidence: 99%

Geochemical constraints on the origin of Late Mesozoic andesites from the Ningwu basin in the Middle–Lower Yangtze Valley, South China

Chen

Zheng

Zhao

2016

Lithos

Self Cite

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“…The exposed area of approximately 30 km 2 (Chen & Xing, 2016) comprises quartz schists and granitic orthogneisses with a protolith age of ca. 1.85 Ga (Chen & Xing, 2016; Grimmer et al., 2003; Zhang et al., 2015).…”

Section: Geomorphic‐geological Setting and Stratigraphymentioning

confidence: 99%

Early Jurassic initiation of the modern drainage pattern of the Dabie orogen (East China) revealed by a multi‐proxy provenance approach

Deng,

Hu,

Chew

et al. 2023

Basin Research

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The timing of the initiation of the present‐day tectonic architecture and drainage systems in eastern China remains debated. This study presents a comprehensive provenance study of the Early Jurassic peripheral basins surrounding the Dabie orogen including framework petrography, heavy‐mineral analysis, single‐grain chronology and chemistry. Clasts of high‐grade schist, muscovite grains, rare gneissic fragments, abundant metamorphic garnet and phengite (Si > 3.3 pfu), combined with a main 216–256 Ma rutile U–Pb population found in these Early Jurassic sandstones, indicate a source from the Triassic (U)HP belt in the Dabie orogen. Sedimentary lithics and ultra‐stable heavy‐mineral assemblages indicate an additional source of recycled sedimentary rocks. Combined with the continuous shift of the youngest detrital rutile age population toward younger ages toward the north that mimics the pattern of metamorphic bedrock ages in the Dabie orogen, we infer that the present surface tectonic architecture and paleodrainage patterns of the Dabie orogen were established in the Early Jurassic. Thus, the Early Jurassic exhumation of the Dabie orogen marked the development of the watershed between Northern and Southern China, namely the Huai River and several principal tributary systems of the middle‐lower Yangtze River.

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“…The Yangtze Block comprises Palaeoproterozoic–Mesoproterozoic basement and unmetamorphosed marine cover sequences ranging from Neoproterozoic (younger than ca. 700 Ma, referred to as the Sinian Period in China) to Early Triassic (Liu, Gao, Diwu, & Ling, ; Zhang, He, & Zheng, ; Zhang & Zheng, ; Zhao et al, ) in age. In addition, basins filled with terrestrial facies sediments (Cretaceous–Palaeogene red beds) and intermediate volcanic rocks of Early Cretaceous age occur locally (Li, Jia, Wu, & Zhang, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Yangtze Block comprises Palaeoproterozoic-Mesoproterozoic basement and unmetamorphosed marine cover sequences ranging from Neoproterozoic (younger than ca. 700 Ma, referred to as the Sinian Period in China) to Early Triassic (Liu, Gao, Diwu, & Ling, 2008;Zhang, He, & Zheng, 2015;Zhang & Zheng, 2013;Zhao et al, 2011) in age. In addition, basins filled with terrestrial facies sediments (Cretaceous-Palaeogene red beds) and intermediate volcanic rocks of Early Cretaceous age occur locally (Li, Jia, Wu, & Zhang, 2011 Flat-slab subduction of the palaeo-Pacific Plate beneath south-eastern China caused development of another fold-and-thrust belt to the south of the Yangtze River, which propagated northward and characterized by isoclinal folds, low-angle nappe, and imbricate thrust faults Li, Zhao, et al, 2010;Shu, 2012;Wang, Fan, Zhang, & Zhang, 2013;Zhang et al, 2009).…”

Section: Geological Settingmentioning

confidence: 99%

Structural characteristics and geochronology of thrust faulting in the Jiulianshan anticlinorium, theLowerYangtze region,East China

et al. 2019

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The Jiulianshan anticlinorium is located at the southern part of the Mount Maoshan–Jiulianshan in the Lower Yangtze region, where a number of new‐found thrust faults were identified. Movement of these thrust faults had resulted in Palaeozoic strata lying unconformably above Cretaceous strata. However, the Lower Yangtze region was mostly under an extensional tectonic regime during the Late Mesozoic, which is inconsistent with existence of the nappe in the Mount Maoshan–Jiulianshan. Therefore, what the structural characteristics are and when these thrust faults developed are important for understanding the evolution of the South China Block. Based on detailed field observations, these new‐found thrust faults outcropped in the Liqiao, Yangxian, and Miaopu areas. These faults, SE‐dipping deeply, developed a meters‐wide fault‐and‐fracture zone of width in meters. The footwall was composed of the Early Cretaceous pyroclastic rock or tuff, which indicates that these faults developed since the Early Cretaceous. Two undeformed dykes formed in the fault‐and‐fracture zone of Miaopu area and a footless intrusion in the hanging wall, which give emplacement ages of ca. 132 Ma by using zircon U–Pb LA‐ICP‐MS dating and thus implies that thrust fault motion occurred prior to or around this time. The volcanic tuff and pyroclastic rocks, located in the footwall of the Yangxian and Miaopu thrust fault, are dated at ca. 137 and 134 Ma, respectively, indicating that fault motion must have occurred after this time. The Qiaotouyang pluton emplaced in the core of one of the folds in the fold‐and‐thrust belt at ca. 141 Ma, which indicates that the fold‐and‐thrust belt of Tongling Uplift formed prior to 141 Ma. Integrating other evidences, such as magmatic quiescence, large‐scale and short‐duration volcanic eruptions, and beginning time of metamorphic core complex and rift basin, it is inferred that Early Yanshanian thrust faults were reactivated during the Late Mesozoic, resulting in thrusting within the Jiulianshan anticlinorium.

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Geochronological and geochemical evidence for the nature of the Dongling Complex in South China

Cited by 33 publications

References 94 publications

Geochemical constraints on the origin of Late Mesozoic andesites from the Ningwu basin in the Middle–Lower Yangtze Valley, South China

Geochemical constraints on the origin of Late Mesozoic andesites from the Ningwu basin in the Middle–Lower Yangtze Valley, South China

Early Jurassic initiation of the modern drainage pattern of the Dabie orogen (East China) revealed by a multi‐proxy provenance approach

Structural characteristics and geochronology of thrust faulting in the Jiulianshan anticlinorium, theLowerYangtze region,East China

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