A geochemical and geochronological study of the Early Cretaceous, extension-related Honggong ferroan (A-type) granite in southwestern Zhejiang Province, southeast China

Zhao, Xilin; Jiang, Yang; Xing, Guangfu; Chen, Zhihong; Liu, Kai; Yu, Miao; Yu, Shengyao

doi:10.1017/s0016756816000790

Cited by 15 publications

(23 citation statements)

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“…These geochemical characteristics match the compositions of adakitic rocks, as originally defined by Defant & Drummond (), although the Yongchun pluton has higher Na 2 O concentrations (2.95–4.03 wt%; average 3.22 wt%) and Na 2 O/K 2 O ratios (average 1.08), similar to the Tangquan pluton (Na 2 O = 2.16–4.32 wt%; average 3.55 wt%) of West Fujian Province (Table ) (G. Wang, Shu, Xu, Tang, & Gaschnig, 2012; W. Xu et al, ; C. Zhang, Ma, & Holtz ; H. Zhang et al, ; X. Zhao et al, , ).…”

Section: Resultssupporting

confidence: 71%

“…Southeast China is characterized by widespread Mesozoic granitic rocks that have attracted much attention in recent decades because of their tectonic significance and large‐scale mineralization (X. Liu et al, ; Q. Wang et al, ; X. Zhao et al, , ). The Cretaceous granitoids are distributed mainly toward the Pacific coast, and are dominated by I‐ and A‐type granites (Li, ; Zhou et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…South Fujian Province is located at the south part of Southeast China, and contains voluminous Mesozoic granites that have been widely studied (e.g. X. Zhao et al, , ). Many of these granites are related in terms of Cu–Au–Mo mineralization and have high Sr/Y ratios, such as the Luoboling, Sifang, and Sukeng plutons (X. Zhao et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Newly discovered Late Cretaceous adakites in South Fujian Province: Implications for the late Mesozoic tectonic evolution of Southeast China

et al. 2018

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The Yongchun pluton is a Late Cretaceous adakitic intrusion in South Fujian Province, Southeast China, with associated metal mineralization. An understanding of the Yongchun pluton is helpful in tectono‐magmatic evolutionary processes, and is important in explaining the origin of related porphyry‐type deposits. Zircons from three samples of the pluton were analyzed by laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS), yielding U–Pb ages of 99.50 ±0.87 Ma, 97.74 ±0.59 Ma, and 99.65 ±0.92 Ma. These ages are similar to those of the Sifang, Luoboling, and Sukeng plutons, all of which are related to Cu–Pb–Zn–Mo mineralization within the study area. The Yongchun pluton comprises high‐potassium, calc‐alkaline, metaluminous rocks, with average A/CNK values of 0.91, 87Sr/86Sr ratios of 0.705 51 to 0.706 83, εNd(t) values of −4.63 to −5.90, and two‐stage Nd model (T2DM) ages of 1.49–1.39 Ga, indicating the magmas were generated by partial melting of Mesoproterozoic continental crust mixed with mantle‐derived magmas. The pluton has geochemical characteristics typical of adakites, such as a high Sr content (average 553 ppm), and low Y (average 15.2 ppm) and Yb (average 1.61 ppm) contents, indicating that the parental magma was formed under high‐pressure conditions. The magmatism was associated with thickening of the lower crust during a change in subduction angle and convergence rate of the paleo‐Pacific Plate at 100 Ma. The compression was limited to South Fujian Province.

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Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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Newly discovered Late Cretaceous adakites in South Fujian Province: Implications for the late Mesozoic tectonic evolution of Southeast China

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“…Sun, Zhang et al, ; Z. Li et al, , ; S. Y. Yang et al, ; K. X. Wang, Sun, Chen, Ling, & Xiang, ; K. D. Zhao et al, ; Gao, Wang, Song, Wang, & Li, ; L. Z. Wang, Xu et al, ; G. G. Wang, Ni et al, ). X. L. Zhao, Jiang et al () considered the geochronology of A‐type granites in five stages: 235–225, 190, 165–155, 100–90, and 140–120 Ma (Figure ). Xia, Liu, and Xu () separated the A‐type granites of SE China into four belts: the southern Jiangxi–Southwestern Fujian, Hunan–Guangxi–Guangdong, Gan–Hang, and Southeast Coastal belts, which formed at 195–175, 165–150, 135–125, and 100–88 Ma, respectively, and approximately correspond to the four belts proposed by X. L. Zhao, Jiang et al ().…”

Section: Discussionmentioning

confidence: 99%

Geochemical, zircon U–Pb–Hf, and whole‐rock Sr–Nd isotopic study of Late Jurassic Sanming A‐type granite in the Wuyi area, Fujian province, Southeast China

Zhao

Jiang

et al. 2017

Geological Journal

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The Sanming pluton is the only Late Jurassic A‐type granitic intrusion in the Wuyi area, west Fujian Province, Southeast China, and its formation has important implications for our understanding of the tectonic evolution of the region. The U–Pb ages of 157 ± 1 Ma and 159 ± 1.1 Ma were obtained for the pluton by zircon LA–ICP–MS analysis, which is interpreted to be the crystallization age of the Sanming pluton (i.e., Late Jurassic). The pluton has the geochemical characteristics of A‐type granite, such as high K2O+Na2O contents (average 7.703 wt%), FeOT/(FeOT + MgO) ratios (average 0.85), and high 10,000 Ga/Al values and Zr + Nb + Ce + Y (380–446.1 ppm, average 419.2 ppm) contents, but relatively low CaO, Sr, and Eu contents. Zircon saturation temperatures range from 875 °C to 890 °C, also similar to other A‐type granites. The (87Sr/86Sr)i ratios (0.707368–0.71102) and εNd(t) and εHf(t) values (−5.54 to −6.09, and −6.93 to −1.07, respectively), the 2‐stage Nd model ages of 1.50–1.55 Ga, and 2‐stage Hf model ages of 1.25–1.62 Ga, suggest the pluton was derived by extensive fractionation of melts containing both mantle materials and Mesoproterozoic crustal components. The Sanming A‐type granitic pluton is younger than adakitic rocks in the region (162 Ma), suggesting a localized transition from compressional to intraplate extensional tectonics at 162–159 Ma, with mantle‐derived material playing a crucial role in the formation of A‐type granites in the Wuyi Mountain area. This tectonic transition is explained by localized rollback of the subducting Pacific plate.

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“…(Sun, Xu, Zou, & Xia, 2015). The Sanqingshan Pluton belongs to A-type granite (Figure 14a,b) and is classified as A 2 -type granites in Ce/Nb versus Y/Nb and Nb versus Y versus Zr/4 diagrams (Figure 14c,d) , the Siling and Heqiao plutons located in Lin'an area formed at 126.8 ± 1.4 Ma (Wu, Ji, & Sun, 2012), and the Honggong Pluton in Jiangshan area formed at 136~126 Ma (Zhao et al, 2016a). All of the granites in the Chun'an and Lin'an areas of northern Zhejiang Province are classified as A 2 -type granites ( Figure 15) and derived from magmas generated by the melting of continental crust in a post-orogenic extensional tectonic setting .…”

Section: Genesis Of Rocks With Arc-like Trace Element Signaturesmentioning

confidence: 99%

Petrogenesis of the Jurassic adakitic rocks in Gan‐Hang Belt South China: Response to the Palaeo‐Pacific Plate oblique subduction

et al. 2017

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To explain the roughly contemporary magmatic activities between Cathaysia Block and both sides of the Jiangnan Orogenic Belt, we discussed the magmatic‐ore related and closely compressive tectonism in the Gan‐Hang Belt. Also, we compared the Yongping Pluton and Yinshan volcanic‐plutonic rocks in northeastern Jiangxi, and Huangshitan and other plutons in the northern Zhejiang, which were produced in the setting of compressive tectonism. We compared bimodel dikes and Sanqingshan A‐type granite in the northeastern Jiangxi, and Huanshitan and other A‐type granites in the northern Zhejiang, which formed in the setting of extension. We proposed that approximately in Middle Jurassic time (175 ± 5 Ma), South China entered into the tectonic system, roughly from south to north oblique subduction of the Paleo‐Pacific Plate. The intermission period of the magmatic activities in Japan and South Korea (~170–120 Ma) was actually the period of the large‐scale magmatic‐ore forming activities in South China. Thus, this oblique subduction resulted in the dynamic imbalance and mutual movement from the deep part to the shallow part of the crust among surrounding blocks of South China and the multiple blocks of South China including those orogens between the North and South China blocks, between the Yangtze Craton and Cathayasian Block, and between the South China Block and Indosinian Block, as well as microcontinental blocks within Cathaysia Block. At present, we cannot rule out the influence of compressional–extensional tectonism for the Gan‐Hang Belt controlled by the Paleo‐Asia tectonic system.

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A geochemical and geochronological study of the Early Cretaceous, extension-related Honggong ferroan (A-type) granite in southwestern Zhejiang Province, southeast China

Cited by 15 publications

References 91 publications

Newly discovered Late Cretaceous adakites in South Fujian Province: Implications for the late Mesozoic tectonic evolution of Southeast China

Newly discovered Late Cretaceous adakites in South Fujian Province: Implications for the late Mesozoic tectonic evolution of Southeast China

Geochemical, zircon U–Pb–Hf, and whole‐rock Sr–Nd isotopic study of Late Jurassic Sanming A‐type granite in the Wuyi area, Fujian province, Southeast China

Petrogenesis of the Jurassic adakitic rocks in Gan‐Hang Belt South China: Response to the Palaeo‐Pacific Plate oblique subduction

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