18 Result(s)
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Article
Isotopic fingerprinting of dissolved iron sources in the deep western Pacific since the late Miocene
Iron (Fe) is a productivity-limiting nutrient in the ocean. However, the sources of dissolved Fe (dFe) in the deep ocean and how they respond to tectonic and climate changes are still poorly understood. In the...
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Petrogenesis of Early Cretaceous adakitic granodiorite: Implication for a crust thickening event within the Cathaysia Block, South China
Adakitic rocks in continental settings are commonly considered to be formed by partial melting of thickened or delaminated lower crust. Investigations on this kind of rocks can provide important information ab...
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The marine redox change and nitrogen cycle in the Early Cryogenian interglacial time: Evidence from nitrogen isotopes and Mo contents of the basal Datangpo Formation, northeastern Guizhou, South China
Cryogenian Datangpo Formation was deposited during the interglacial time between the Sturtian and Marinoan ice ages. We studied nitrogen isotope compositions and contents of Mo of the black shales from the bas...
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Open AccessTiming of hydrothermal activity associated with the Douzhashan uranium-bearing granite and its significance for uranium mineralization in northeastern Guangxi, China
The Miaoershan uranium (U) ore field in northeastern Guangxi is one of the important granite-related U deposits in south China and is closely related to the Douzhashan U-bearing granite. The Douzhashan granite...
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Open AccessLate Cenozoic history of deep water circulation in the western North Pacific: Evidence from Nd isotopes of ferromanganese crusts
Despite its importance in regulating the global climate, the past deep ocean circulation in the western North Pacific has still been poorly understood. Nd isotopes of ferromanganese crusts have been proven to ...
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Article
Open AccessSHRIMP zircon U-Pb ages and tectonic implications for Indosinian granitoids of southern Zhuguangshan granitic composite, South China
The large southern Zhuguangshan granitic batholith composite consists of granites with ages varying from the Caledonian through Indosinian to Yanshanian. Based on K-Ar dating data, the ages of the major parts ...
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Article
Open AccessNeodymium isotopes distribution and transport in the central North Pacific deep water
Radiogenic Neodymium (Nd) isotopes in the central North Pacific deep water have been generally interpreted as reflecting Pacific arcs input according to previous studies, while little is known about the specif...
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Article
Hf isotopic composition of zircons from the Huashan-Guposhan intrusive complex and their mafic enclaves in northeastern Guangxi: Implication for petrogenesis
High precision zircon U-Pb dating indicates that main intrusive bodies (Tong’an, Niumiao, Huashan, Lisong), and a mafic microgranular enclave in the Huashan-Guposhan complex were formed at 160–163 Ma. The ɛHf(t) ...
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Article
Sm-Nd isotopic compositions of Cambrian-Ordovician strata at the **ggangshan area in Jiangxi Province: Tectonic implications
Whole-rock Sm-Nd isotopes were investigated for Cambrian-Ordovician strata from the **ggangshan area between the Yangtze Block and Cathysia Block in South China. These strata were deposited as a greatly thick...
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Article
Sr-Nd isotopic compositions of the Changjiang sediments: Implications for tracing sediment sources
The suspended particulate and fine-grained floodplain sediments were collected from the main stream and tributaries of the Changjiang River for Sr-Nd isotopic measurements. The ε Nd(0) val...
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Article
Estimate of influence of U-Th-K radiogenic heat on cooling process of granitic melt and its geological implications
The U-Th-40K concentrations of granite are on 1–2 orders of magnitude greater than those of basaltic-ultrabasic rocks. Radiogenic heat of a granitic melt has significant influence on the cooling-crystallization p...
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Article
Geochemical characteristics of sediment pore water from Site XS-01 in the **sha trough of South China Sea and their significance for gas hydrate occurrence
Gas hydrate is a recently-found new source of energy that mostly exists in marine sediments. In recent years, we have conducted gas hydrate exploration in the South China Sea. The **sha trough, one of the prom...
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Article
New index of ferromanganese crusts reflecting oceanic environmental oxidation
Ferromanganese crusts (hereinafter crusts) form in aerobic environment and the environmental oxidation degree is recorded by the redox sensitive element Co in the crusts. The ages of the layers from the surfac...
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Article
SHRIMP U-Pb zircon dating for lamprophyre from Liaodong Peninsula: Constraints on the initial time of Mesozoic lithosphere thinning beneath eastern China
It is undebated fact that the lithospheric mantle beneath eastern China was considerably thinned during the Mesozoic time. However, it has no adequate evidence for the exact timing when the lithosphere thinnin...
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Article
Isotopic indication to source of ore materials and fluids of the Wangfeng gold deposit in Tianshan: A case study of metallogenesis during collisional orogenesis
The Wangfeng gold deposit is one of the five most important gold deposits in the Tianshan. Studies of its metallogenic time, space, geodynamic background, ore feature and ore fluid have proved that the deposit...
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Article
The thermal history of the miarolitic granite at **ncun, Fujian Province, China
The thermal history of the late Mesozoic miarolitic granite has been studied based on zircon U-Pb dating, whole rock Rb-Sr dating and K-Ar dating of muscovite, biotite and K-feldspar from the same rock sample....
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Article
Crust evolution in Southeast China: evidence from Nd model ages of granitoids
Nd isotopic compositions of 58 granitoids in South China have been reported in this paper. These data together with other published data reveal that granites with Nd model ages(tDM) greater than 1.8 Ga are distri...
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Article
The Nd-Sr isotope study of Mesozoic granitoids in Jiangxi Province
Nd-Sr isotopic compositions of 12 Mesozoic granitoids from Jiangxi Province have been reported. They show low-∈ND(−13.8–−8.3), high-/Sr(0.71069–0.73981) and oldt DM (2087–1635 Ma). Comparison betw...
