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Paleogene volcanic rocks crop out in three sedimentary basins, namely, Sanshui, Heyuan and Lienping, in the attenuated continental margin of south China. Lavas from the Sanshui basin which erupted during 64-43 Ma are bimodal, consisting of intraplate tholeiitic basalt and trachyte/rhyolite associations. Similar to Cretaceous A-type granites from the nearby region, the felsic member shows peralkaline...
The genetic links among rift magmatism, crustal growth and water–rock interaction are an important issue about mass and heat transfer between mantle and crust during supercontinent breakup. A combined study of Hf and O isotopes in zircons from Neoproterozoic granitoids in South China provides evidence for growth and reworking of juvenile and ancient crusts with different styles of water–rock interactions...
SHRIMP U-Pb zircon ages and geochemical and Nd isotopic data are reported for mid-Neoproterozoic igneous rocks in northern Zhejiang Province, South China. The Shenwu dolerite dykes, the Daolinshan granite-diabase complex, and the Shangshu bimodal (basalt-rhyolite) volcanic rocks were dated at 849±7 Ma, 794±9 Ma and 792±5 Ma, respectively. All the studied mafic rocks are tholeiitic in compositions...
Numerous Neoproterozoic felsic and mafic–ultramafic intrusions occur in the Hannan region at the northern margin of the Yangtze Block. Among these, the Wudumen and Erliba plutons consist of granodiorites and have SHRIMP zircon U–Pb ages of ∼735 Ma. The rocks have high K 2 O (0.8–3.6 wt.%) and Na 2 O (4.4–6.4 wt.%) and low MgO (0.4–1.7 wt.%). They also have high Sr/Y (32–209) and (La/Yb)...
There is an ongoing debate concerning whether the vast Nanling Mountain granitoids of South China are the result of Jurassic paleo-Pacific subduction. We address this question by examining two Mesozoic basalt successions in South China, one parallel and the other oblique to the convergence boundary between the paleo-Pacific plate and South China continent. The geochemical characteristics of these...
The 820-Ma Wangjiangshan, 814-Ma Beiba, 780-Ma Bijigou and 746-Ma Luojiaba mafic–ultramafic intrusions in the Hannan region of the northern margin of the Yangtze Block, South China, are used to constrain the secular evolution of the lithospheric mantle. These intrusions are mainly composed of gabbros, but the Beiba and Wangjiangshan intrusions also contain diorite. Rocks from these four intrusions...
The tectonic setting of South China during the Neoproterozoic remains a subject of debate. Neoproterozoic adakites from Xuelongbao and Datian along the western margin of the Yangtze Craton have been used to argue for an arc setting assuming that these rocks are the melting products of a subducted oceanic slab (Zhou, M.F., Yan, D.P., Wang, C.L., Qi, L., Kennedy, A., 2006a. Subduction-related origin...
The Early Cretaceous Baijuhuajian pluton is an A-type granitic intrusion, emplaced along the Jiangshan-Shaoxing (JSSX) fault zone in western Zhejiang Province, SE South China. It intruded into a Late Jurassic volcanic basin bounded by Proterozoic sandstone and siltstone. The granite has a coarse-grained, porphyritic texture and is composed of alkali feldspar phenocrysts in a matrix of K-feldspar,...
The Gangbian alkaline complex in the southeastern Yangtze Block (South China) is composed of Si-undersaturated pyroxene syenites and Si-saturated to -oversaturated syenites and quartz monzonites. SIMS zircon U–Pb analyses indicate that the complex was emplaced at 848±4 Ma, during a previously-recognized interval of magmatic quiescence between the ca 1.0–0.89 Ga Sibaoan orogenic magmatism and the ca...
A granite–syenite–gabbro association from inland South China has been studied for zircon U–Pb ages and Hf isotopic compositions as well as whole-rock elemental and Sr–Nd isotopic compositions to constrain their sources and tectonic settings. These rocks have distinctive crystallization ages: the Longyuanba biotite granites have a mean age of ~240Ma, the Longyuanba two-mica granites, Pitou alkali-feldspar...
The Willouran Basic Province in South-Central Australia and the Guibei large igneous province (LIP) in the South China Block are two of the most prominent Neoproterozoic LIPs related to the breakup of the supercontinent Rodinia. The Willouran Basic Province is dominated by tholeiitic mafic dykes (the Gairdner dykes), flood basalts (the Wooltana basalts), and mafic intrusions. The basaltic suites across...
We examined the geochronology, petrology, and geochemistry of the two-stage Guikeng pluton, Wuyi Mountain Range, South China, with the aim of assessing the influence on Indosinian magmatism in South China of collision/amalgamation between the Sibumasu Block and the Indo-China and South China blocks, and between the North China and Yangtze blocks. An additional aim was to summarise the characteristics...
The debate on the Mesozoic tectonics of the South China Block (SCB), featuring a broad orogenic belt and a large continental magmatic province, has been rejuvenated in the past years. There are a number of competing tectonic models, each predicting different time, space, and compositional evolutional trends for the Mesozoic igneous rocks, including sporadic basalts. In this paper, we report high precision...
South China is famous for its polymetallic deposits, with more than 50% of the world's W and Sb reserves and 20% of the Sn reserves, as well as abundant Cu–Mo–Pb–Zn–Au–Ag, Ta, Nb, HREE and U. This special issue reports recent progress on the tectonic evolution, magmatism and ore deposits of South China, which leads to a more comprehensive understanding of the Mesozoic large scale magmatism and mineralization...
Zircon U–Pb dating and Hf-isotope compositions and bulk geochemical analyses of granites and metasedimentary rocks from the NE-striking Pingtan–Dongshan Metamorphic Belt (PDMB), coastal South China, are used to constrain their formation ages and tectonic settings. LA-ICPMS zircon U–Pb dating results reveal four periods of magmatism/metamorphism along the PDMB, including ~187Ma, 133–130Ma and 108–100Ma...
Metasedimentary granulite enclaves hosted in the Indo-Sinian Darongshan–Shiwandashan granite belt from the southeastern Guangxi province, South China, experienced a three-stage metamorphic evolution: (1) the early prograde metamorphism in the stability field of sillimanite at ~800°C; (2) the peak metamorphism with a mineral assemblage of spinel+quartz at 7.5–8.0kbar and 950–1000°C (260–250Ma); and...
The Luxi and Xiazhuang granitic plutons are parts of the Guidong granite belt in northern Guangdong Province, China. They occur next to each other and have similar crystallization ages. However, the Xiazhuang pluton hosts several important uranium (U) ore deposits, whereas the Luxi pluton does not. This study compares the two plutons using whole-rock geochemistry, biotite compositions, zircon U–Pb...
The Xuefengshan Belt, characterized by large-scale fold and thrust structures and widespread granites, is a key area to decipher the tectonic evolution of the South China block. In this belt, two magmatic episodes are recorded by Early Paleozoic and Early Mesozoic granites. In this paper, we carried out precise SIMS zircon UPb dating and in situ LuHf isotopes measurements on these granitic plutons...
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