Zaicong Wang

Zaicong Wang
China University of Geosciences · Department of Geochemistry

32.9
 · 
Dr. rer. nat.

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41
Publications
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521
Citations

Publications

Publications (41)
Article
Full-text available
Gold (Au) is an important indicator in many geochemical studies, but the quantification of sub-nanogram Au in rock samples is challenging. Herein, a simple and rapid analytical protocol for the determination of sub-nanogram Au in 1-2 g rock samples is established using graphite furnace atomic absorption spectrometry (GFAAS) after polyurethane foam...
Article
Full-text available
The concentrations of Cu and Ag, both insoluble chalcophile elements, can be used to place tight constraints on the proportion of basalts in the upper continental crust (UCC) through time via analyses of fine-grained terrigenous sedimentary rocks. Copper and Ag concentrations in magmas are largely controlled by sulfide dissolution during melting an...
Article
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This study presents high precision Zn stable isotope analyses for lower crustal rocks (9 granulites from Archean terrains and 30 lower crustal xenoliths) from the north margin of the North China Craton (NCC) to understand the behavior of Zn isotopes during deep crustal processes and the Zn isotopic composition of the lower continental crust (LCC)....
Article
Early Cretaceous lamprophyre dykes occur widely in the Jiaodong Peninsula, eastern North China Craton (NCC). These mantle-derived magmatic products allow us to elucidate subduction-related mantle metasomatic events that modified the sub-continental lithospheric mantle of the NCC. The Jiaodong Peninsula lamprophyres display zircon UPb ages of 130 ±...
Article
Desilicification elevates extraction of Re and platinum‐group elements (PGEs) from many geological reference materials (RMs), but the extent to which it affects less chalcophile elements has been investigated rarely. To further evaluate the effect of desilicification, mass fractions of elements with variable chalcophile affinities (In, Cd, Cu, Ag,...
Article
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The Pb isotopic compositions of granulite xenoliths are crucial to constrain the formation and evolution of the lower continental crust (LCC) and are potentially the key to resolve the first Pb paradox of the Earth. However, it remains unclear how host magma infiltration affects the Pb isotopic compositions of LCC xenoliths and how different this e...
Article
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Resolving the geochemical discrepancies between the bulk continental crust and its building blocks, basaltic arc magmas, can provide insights into the processes by which the continental crust is formed. One of the discrepancies is that the bulk continental crust is depleted in Cu and has a lower Cu/Ag ratio (∼500) than basaltic arc magmas (∼3500)....
Article
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A comparative evaluation was carried out to determine the trace metallic constituents in nuclear-grade BeO by D.C. arc carrier distillation and inductively coupled plasma atomic emission spectrometry. D.C. arc carrier distillation is accomplished by physical separation of the major matrix to avoid interference, while ICP-AES employs the solu- tion...
Article
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The origin of giant lode gold deposits of Mesozoic age in the North China craton (NCC) is enigmatic because high-grade metamorphic ancient crust would be highly depleted in gold. Instead, lithospheric mantle beneath the crust is the likely source of the gold, which may have been anomalously enriched by metasomatic processes. However, the role of go...
Article
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Variations of the stable Ca isotopic compositions (noted as δ44/40Ca relative to the SRM915a standard) of basalts are interpreted as effects of mantle sources. Mantle pyroxenites are a minor but integral part of the mantle and, as fusible components, they are important source rocks to understand chemical and isotopic heterogeneity in mantle-derived...
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This study presents the first high precision method to analyze stable Zr isotope ratios in zircons using laser ablation multiple collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS). Interference problems for...
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The oceanic crust consists mainly of a lower layer of cumulate gabbroic rocks and an upper layer of differentiated basalts. The thicknesses and proportions of the gabbroic and basaltic layers in different oceans are largely controlled by spreading rate, magma supply, and magmatic differentiation processes. Evaluating the effects of complex magmatic...
Article
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Determination of gold abundances in natural rock is critical for applications, but very challenging. Here we report a method for determining gold with a very low mass fraction (> 0.01 ng g−1) in rocks. The method involves Carius tube digestion with reverse aqua regia, chromatographic separation to remove most of the sample matrix and measurement by...
Article
Full-text available
Cratons are the most ancient parts of continents that are underlain by thick, cold, old and refractory lithospheric roots. However, how cratonic roots remain stable for billions of years and become remobilized later is still not well understood. The eastern North China Craton (NCC) is the best region to illuminate this issue because of its well-kno...
Article
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Chlorine, bromine and iodine play very important roles in tracing geological and environmental processes due to their unique properties. Because of the difficulty and complexity of the conventional halogen detection methods, accurate and reliable data regarding halogens have been rarely reported, especially for low content geological materials. In...
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Earth’s formation by the accretion of volatile-rich carbonaceous chondrite-like materials, without a need for exotic building blocks or secondary volatile loss, is supported by recognition of a plateau pattern for highly volatile elements.
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The Earth's mantle has a complex history of partial melting and melt-peridotite reaction that have redistributed Ca and other elements between residues and melting products. Given the considerable Ca isotopic variation reported in mantle rocks, evaluation of the fractionation of stable Ca isotopes in magmatic processes in the mantle is critical to...
Article
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Metal transfer from mantle wedge to primitive arc magmas and subsequent enrichment by magmatic fractionation and volatile exsolution are critical processes for mineralization in arc systems. Copper is one of the most important ore-forming elements whose behavior is sensitive to oxygen fugacity. Copper isotope composition (δ ⁶⁵ Cu) may provide valua...
Article
Full-text available
Wide application of Ca stable isotopes requires reliable production of high-precision data and in recent years multiple collector inductively coupled plasma mass spectrometers (MC-ICP-MS) have been used as an alternative to traditional thermal ionization mass spectrometry. The main challenges in using MC-ICP-MS to measure Ca stable isotopes are sca...
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Delamination of dense, sulfide-bearing pyroxenitic cumulates was proposed to explain the low Cu content and the evolved major element composition of the continental crust, yet evidence for this hypothesis has been circumstantial. In this study, we present Cu and Ag contents of mantle pyroxenites and associated peridotites from the Balmuccia peridot...
Article
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Sulfides in mantle rocks sometimes have unradiogenic Pb isotopic compositions and assuming specific conditions, may represent a low U/Pb reservoir that might balance the radiogenic Pb isotope reservoirs of the silicate Earth. A critical requirement to test this hypothesis is knowledge of typical Pb contents in sulfides from different types of mantl...
Article
An important issue in Earth's earliest history is the timing and mixing history of the late accreted material that supplied highly siderophile elements to Earth's mantle after core segregation. Previously, constraints on ancient mantle processes could only be obtained indirectly from mantle-derived magmas such as basalts or komatiites. Relics of Eo...
Article
To investigate the behavior of Cu isotopes during partial melting and melt percolation in the mantle, we have analyzed Cu isotopic compositions of a suit of well-characterized Paleozoic peridotites from the Balmuccia and Baldissero massifs in the Ivrea-Verbano Zone (IVZ, Northern Italy). Our results show that fresh lherzolites and harzburgites have...
Article
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Silver and Cu show very similar partitioning behavior in sulfide melt-silicate melt and metal-silicate systems at low and high pressure-temperature (P-T) experimental conditions, implying that mantle melting, fractional crystallization and core-mantle differentiation have at most modest (within a factor of 3) effects on Cu/Ag ratios. For this reaso...
Article
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Silver abundances in mantle peridotites and the behavior of Ag during high temperature mantle processes have received little attention and, as a consequence, the abundance of Ag in the bulk silicate Earth (BSE) has been poorly constrained. In order to better understand the processes that fractionate Ag and other chalcophile elements in the mantle,...
Article
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Sulfide segregation from sulfur saturated basic magmas affects the compositions of chalcophile elements such as the highly siderophile elements (HSE) and the chalcogens S, Se, Te to variable extent. Whether this process predominantly occurs in the lower crust or in the mantle and how segregation of liquid sulfide and accumulation affects concentrat...
Article
Mass fractions of S, Cu, Se, Mo, Ag, Cd, In, Te, Ba, Sm, W and Tl were determined by isotope dilution sector-field ICP-MS in the same sample aliquot of reference materials using HF-HNO3 digestion in PFA beakers in pressure bombs and glassy carbon vessels in a high pressure asher (HPA-S) for comparison. Additionally, Bi was determined by internal st...
Article
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The Jiapigou gold belt (>150 t Au), one of the most important gold-producing districts in China, is located at the northeastern margin of the North China Craton. It is composed of 17 gold deposits with an average grade around 10 g/t Au. The deposits are hosted in Archean gneiss and TTG rocks, and are all in shear zones or fractures of varying orien...
Article
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Geological reference materials (RMs) with variable compositions and NIST SRM 612 were analysed by isotope dilution mass spectrometry for bulk rock concentrations of chalcogen elements (sulfur, selenium and tellurium), rhenium and platinum-group elements (PGEs: Ru, Pd, Os, Ir and Pt), including the isotope amount ratios of 187Os/188Os. All concentra...
Article
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The excess of highly siderophile (iron-loving) elements (HSEs) and the chondritic ratios of most HSEs in the bulk silicate Earth (BSE) may reflect the accretion of a chondritic 'late veneer' of about 0.5 per cent of Earth's mass after core formation. The amount of volatiles contained in the late veneer is a key constraint on the budget and the orig...
Article
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The conditions at which melt percolation and reactive infiltration of depleted mantle peridotites fractionate highly siderophile elements (HSE) and cause re-equilibration of 187Os/188Os in mantle rocks are still poorly constrained. In a comparative study of the Paleozoic Balmuccia (BM) and Baldissero (BD) peridotite tectonites (Ivrea-Verbano Zone,...
Article
The Chehugou Mo–Cu deposit, located 56 km west of Chifeng, NE China, is hosted by Triassic granite porphyry. Molybdenite–chalcopyrite mineralization of the deposit mainly occurs as veinlets in stockwork ore and dissemination in breccia ore, and two ore-bearing quartz veins crop out to the south of the granite porphyry stock. Based on crosscutting r...
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Haigou gold deposit, located in the southeast of the Jiapigou-Haigou gold belt in Jilin Province, is a typical lode gold deposit. It is hosted by Hecynian granitoid complex, and consists of gold-bearing quartz veins. It can be devided into four ore-forming stages: I, quartz-K-feldspar: II, quartz-pyrites, occasionally with gold: III, polymetallic s...
Article
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Chehugou Mo-Cu deposit is a typical porphyry Mo-Cu deposit in the Xilamulun molybdenum metallogenic belt on the northern margin of North China Craton ( MNCC). It locates to the south of the MNCC fault. The orebodies are mainly hosted in granite porphyry. The Mo mineralization is characterized by veinlet-disseminated mineralization as well as brecci...

Questions and Answers

Question & Answers (2)
Question
Dear Dany,
When you use NiS-FA for PGE, I think it is possible also to measure Au contents. The technique is routine or not? I am wondering how high the procedural blanks for PGE and Au?
Now I have one project to understand the origin of Au for the Au deposits. The Au and PGE contents of many mantle-derived rocks and the rocks from the continental crust are planned to measure. If NiS method is easy to handle, I think it is a good choice. The alternative method I am using is to use Carius tube digestion and measure PGE-Au in the acid solution (Isotope dilution for PGE), which is very time-consuming.
Do you have some suggestions? Thanks a lot.
Best wishes,
Zaicong

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Projects (3)
Project
Nu Plasma 1700 at CUG Wuhan has very powerful abilities with high resolution to easily measure non-traditional stable isotopes and now performs very well for Ca-Fe-Cu-Zn isotopes. We mainly apply these isotopes and others to address the wide geological questions, including mantle-crustal magmatic processes, material recycling, Earth's surface systems and so on.
Project
1) the contents of chalcophile elements in continental basalts and the mantle xenoliths; 2) the effect of subducted materials on chalcophile elements; 3) the main origin of giant gold deposits in North China Cration