In situ zircon Hf–O isotopic analyses of late Mesozoic magmatic rocks in the Lower Yangtze River Belt, central eastern China: Implications for petrogenesis and geodynamic evolution

Yan, Jiaxin; Liu, Jianmin; Li, Quanzhong; Xing, Guangfu; Liu, Xiaoqiang; Xie, Jiancheng; Chu, Xiaoqiang; Chen, Zhihong

doi:10.1016/j.lithos.2015.03.013

Cited by 123 publications

(51 citation statements)

References 94 publications

(164 reference statements)

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“…The 91500 standard zircon was used for standardization, and a National Institute of Standards and Technology Standard Reference Material 610 standard silicate glass was used for instrument optimization. The approaches we used are outlined by Yan et al (), and uncertainties on individual LA‐ICP‐MS analyses are quoted at the 1 σ level. Common Pb was corrected following Andersen (), and the results (Table S2 in the supporting information) were generated using ICP‐MS DataCal 9.6 (Y. S. Liu et al, ) and ISOPLOT 4.1 software (Ludwig, ).…”

Section: Zircon U‐pb Datingmentioning

confidence: 99%

Strike‐Slip Motion Within the Yalu River Fault Zone, NE Asia: The Development of a Shear Continental Margin

et al. 2018

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The ca. 700-km long Yalu River Fault Zone (YRFZ) is a major component of the NE striking strike-slip fault system of the East Asia continental margin, which was active during the late Mesozoic. Despite its importance, the origin and timing of activity along the fault zone remain unclear. We present structural data that indicate that the NE striking YRFZ was initiated as a sinistral strike-slip fault zone. Ductile, brittle-ductile, and brittle structures are exposed along its length, with more ductile structures in the southwest. The shear belts and faults predominantly dip steeply to the southeast and have a minor reverse component of motion. Microstructures indicate deformation temperatures of~300°C-500°C for the ductile region and~200°C-300°C for the brittle-ductile region. Inversion of fault slip data measured from brittle faults indicates that the sinistral motion was a result of N-S compression. We present in situ zircon U-Pb dating results for deformed and undeformed igneous rocks sampled from the ductile shear belts, indicating that sinistral faulting occurred between 146 and 131 Ma. This result correlates with the timing of a regional N-S shortening event during the earliest Early Cretaceous. Our data, together with other published studies of this strike-slip fault system, suggest that the East Asia shear margin was initiated at the beginning of the Early Cretaceous with the synchronous formation of a series of NE to NNE striking sinistral faults. This brief transpressive event along the shear margin was a result of the rapid, oblique subduction of the Izanagi Plate along a NNE trending trench.

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Section: Zircon U‐pb Datingmentioning

confidence: 99%

Strike‐Slip Motion Within the Yalu River Fault Zone, NE Asia: The Development of a Shear Continental Margin

et al. 2018

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“…However, these interpretations are inconsistent with our data. The Yangchongli A-type granites with other Atype granites nearby have high silica contents, which mean they are unlikely to have been derived directly from a mantle source, and the calculated melt δ 18 O values of 9.1‰-12.3‰ (Yan et al, 2015), significantly higher than in the Cu-Au related rocks in the early stage which were derived from metasomatized mantle and also higher than the values (6.4‰-7.3‰) in typical slab-derived adakites (Bindeman et al, 2005). During the generation of granitic magmas, input of juvenile mantle materials, either directly by mantle-derived mafic melts, or by remelting of juvenile mantle-derived mafic lower crust, can result in high 176 Hf/ 177 Hf ratios (i.e.…”

Section: Genesis Of K-feldspar Granitementioning

confidence: 96%

“…LCC of the Yangtze block is represented by the Kongling TTG gneisses (Jahn et al, 1999;. A -type granites in LYRB from Yan et al, 2015;Peng Ge, 2012;Gu et al, 2017;Yang et al, 2016 Dec. 2017…”

Section: Genesis Of K-feldspar Granitementioning

confidence: 99%

“…The 14 Ma difference between them show that Yangchongli region has experienced different periods of magmatic activity. The age of monzodiorite is similar to the Yanshanian diagenesis events ranging from 155 to 133 Ma, which is controlled by the nearly east-west trending Tongling-Nanling fault (Chang Yinfo et al, 1991;Tang Yongcheng et al, 1998), corresponding to the regional Cu Granite from Dabie-Sulu Orogen (Zhang et al, 2002; Lower crust (Huang et al, 2008); Northern Hemisphere Reference Line (NHRL) (Zindler and Hart, 1986); MORB and abyssal sediment (Hofman, 2003); A-type granites in LYRB from Yan et al, 2015;Peng Ge, 2012;Yang et al, 2016. Mafic rocks from Yang et al, 2016.…”

Section: Geochronologymentioning

confidence: 99%

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Geological and Geochemical Constraints on the Newly Discovered Yangchongli Gold Deposit in Tongling Region, Lower Yangtze Metallogenic Belt

Duan

Yang

2017

Acta Geologica Sinica (Eng)

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The newly discovered Yangchongli gold deposit is a unique independent gold deposit in the Tongling ore‐cluster region controlled by the tectonic alteration firstly discovered in the Lower Yangtze Metallogenic Belt (LYMB). The host magmatic rocks mainly consist of monzodiorite and K‐feldspar granite. The LA‐ICP‐MS U‐Pb zircons dating yielded weighted mean 206Pb/238U ages of 140.7 ± 1.8 Ma and 126.4 ± 1.2 Ma for the monzodiorite and K‐feldspar granite, respectively. Monzodiorites are enriched in Sr, Ba, Rb, and depleted in Y, Yb with high Sr/Y and La/Yb ratios, similar to the geochemical features of adakite, considered as products of differentiation of mafic magmas originating from lithospheric mantle melt/fluids caused by metasomatism during paleo‐Pacific Plate subduction in the Mesozic. In contrast, the compositions of K‐feldspar granites are A‐type granites, indicating an extensional tectonic background. Gold ores hosted in the fracture zone occurred as quartz vein within cataclastic rock. Sulfur and lead isotopes from pyrites show crust‐mantle mixing characteristics. Metal components from strata also took part in the gold mineralization, and resulted from two episodes of magmatism that were probably related to tectonic transition from a compressive to an extensional setting between 140–126 Ma, which led to the Mesozoic large‐scale polymetallic mineralization events in eastern China.

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“…The Lower Yangtze River Belt (LYRB) in China has been the focus of several geological, geochemical and geochronological studies in relation to the voluminous magmatism and associated metallogeny [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The LYRB hosts abundant Mesozoic calc-alkaline magmatic rocks with spatially and involved partial reworking of the older basement.…”

Section: Introductionmentioning

confidence: 99%

Mesozoic High- and Low-SiO2 Adakites and A-Type Granites in the Lower Yangtze River Belt, Eastern China: Implications for Petrogenesis and Metallogeny

Liu

Chu

et al. 2018

Minerals

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The Lower Yangtze River Belt (LYRB) is one of the important magmatic and metallogenic belts in China and hosts abundant Mesozoic calc-alkaline magmatic rocks and economic mineral deposits. Anqing orefield in the southwestern of the LYRB received less attention during the last two decades. Here, we present an integrated study of whole-rock major and trace elements, zircon U-Pb dating and Lu-Hf isotopes on late Mesozoic adakites and A-type granites from the Anqing orefield. The adakites emplaced during 138–136 Ma and can be further subdivided into two types: high-SiO2 adakites (HSA) with SiO2 60 wt % from the Zongpu intrusion, and low-SiO2 adakites (LSA) 60 wt % from the Yueshan intrusion. The rocks display mid- to high-K calc-alkaline features and have consistent arc-like trace element characteristics with enrichment in LREE and LILE, and depletion in HREE and HFSE. The distinct zircon εHf(t) values for the LSA (from −27 to −20) and HSA (from −15 to −5) preclude a magma mixing model, yet suggest a subduction-related setting with partial melting of the subducted slab and overlying metasomatic mantle wedge. The A-type granites dated at 124 Ma from the Dalongshan intrusion characterized by LILE and LREE enrichment and slightly negative Eu anomalies, with lower MgO, CaO but higher K2O and Na2O contents. Their zircon εHf(t) values and geochemical features suggest that the parent magma was produced by the partial melting of Neoproterozoic crustal components, followed by variable degrees of fractional crystallization under a back-arc extensional setting, together with minor juvenile crust input. The adakites and A-type granites investigated in this study record a tectonic transition from compressive to extensional setting during 138–124 Ma. The transitional magmatic pulses are associated with distinct metallogenic signature with the adakites hosting copper deposits and the A-type granites linked to uranium mineralization.

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In situ zircon Hf–O isotopic analyses of late Mesozoic magmatic rocks in the Lower Yangtze River Belt, central eastern China: Implications for petrogenesis and geodynamic evolution

Cited by 123 publications

References 94 publications

Strike‐Slip Motion Within the Yalu River Fault Zone, NE Asia: The Development of a Shear Continental Margin

Strike‐Slip Motion Within the Yalu River Fault Zone, NE Asia: The Development of a Shear Continental Margin

Geological and Geochemical Constraints on the Newly Discovered Yangchongli Gold Deposit in Tongling Region, Lower Yangtze Metallogenic Belt

Mesozoic High- and Low-SiO2 Adakites and A-Type Granites in the Lower Yangtze River Belt, Eastern China: Implications for Petrogenesis and Metallogeny

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