Mei‐Fu Zhou

China University of Geosciences

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John Malpas

University of Hong Kong

Paul T. Robinson

China University of Geosciences

Liang Qi

Institute of Geochemistry

Jianfeng Gao

Chinese Academy of Sciences

Christina Yan Wang

Guangzhou Institute of Geochemistry

Min Sun

Nanjing Medical University

Jun‐Hong Zhao

Chinese Academy of Sciences

Dan‐Ping Yan

China University of Geosciences (Beijing)

Wei Terry Chen

Chinese Academy of Sciences

Xin-Fu Zhao

China University of Geosciences

Cooperative Institutions

Chinese Academy of Sciences

237

University of Chinese Academy of Sciences

113

China University of Geosciences

105

China University of Geosciences (Beijing)

Institute of Geochemistry

University of Hong Kong

Chinese Academy of Geological Sciences

Guangzhou Institute of Geochemistry

Institute of Geology and Geophysics

Ministry of Natural Resources

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Late Paleoproterozoic to Mesoproterozoic rift successions in SW China: Implication for the Yangtze Block–North Australia–Northwest Laurentia connection in the Columbia supercontinent

Sedimentary Geology (2014)

Wei Wang Mei‐Fu Zhou Xin-Fu Zhao Wei-Terry Chen Dan‐Ping Yan

Supercontinent

Laurentia

Thermal subsidence

Dolostone

Conglomerate

Carbonate platform

Chemostratigraphy

10.1016/j.sedgeo.2014.05.004

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Citations (109)

Role of Crustal Contamination in Formation of the Jinchuan Intrusion and Its World-Class Ni-Cu-(PGE) Sulfide Deposit, Northwest China

International Geology Review (2006)

Xie‐Yan Song Mei‐Fu Zhou Christina Yan Wang Liang Qi Chengjiang Zhang

The Jinchuan ultramafic body on the southwestern margin of the North China craton hosts a giant Ni-Cu-(PGE) deposit. This dike-like intrusion consists mainly of lherzolite, dunite, and minor pyroxenite. Fortly-seven vol% of the intrusion is composed of disseminated sulfide ore and minor massive and net-textured ores. Ore bodies occur commonly in the lower part of the intrusion; the largest contains about 50% of the total metallic resources in Jinchuan, and has a "flame-like" shape in vertical cross-section. The ultramafic rocks have high MgO (19-45 wt%), low CaO (<6.5 wt%) and Al2O3 (<7 wt%), and right-inclined chondrite-normalized REE patterns. These rocks contain variable Ir (0.4-17 ppb), Ru (0.6-21 ppb), Rh (0.05-8.4 ppb), Pt (0.6-196 ppb), and Pd (1.2-135 ppb), in general lower than those in the sulfide ores (2.9-110 ppb Ir, 3.3-260 ppb Ru, 1.5-237 ppb Rh, 6.9-3972 ppb Pt, and 15-532 ppb Pd). They have high Th/Nb (0.15-0.5) ratios and show primitive mantle-normalized trace element patterns with Nb-Ta negative anomalies, consistent with derivation from mantle magmas variably contaminated by crustal materials. Compositional heterogeneity of the disseminated sulfides cannot be accounted for by in-situ fractional crystallization, but is consistent with differentiation and sulfide segregation in a staging magma chamber at depth. We propose a compressive tectonic model in which injection of sulfide-poor, crystal-rich magmas from the upper part of the staging magma chamber was followed by injection of a sulfide-rich crystal-mush from the lower part of the staging magma chamber to form the Jinchuan body.

World class

10.2747/0020-6814.48.12.1113

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Citations (40)

Phyllosilicate controls on magnesium isotopic fractionation during weathering of granites: Implications for continental weathering and riverine system

Earth and Planetary Science Letters (2020)

Yan Li Fang‐Zhen Teng Mei‐Fu Zhou

Vermiculite

Saprolite

Pseudomorph

Supergene (geology)

Silicate minerals

Illite

Parent rock

10.1016/j.epsl.2020.116613

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Citations (26)

An Unusually Warm Upper‐Crust in the Late Paleozoic North China Continental Arc: Implications for the Thermal Modification of the Giant Bayan Obo REE Deposit

Earth and Space Science (2023)

Shuan‐Hong Zhang Mei‐Fu Zhou Yue Zhao Qi‐Qi Zhang Guohui Hu

Abstract The genesis and timing of formation of the giant Bayan Obo deposit, the world's largest rare earth element (REE) deposit in the western part of the late Paleozoic northern North China continental arc (NCA), are highly controversial due to complex mineral assemblages and reported ages of mineralization. We conducted new zircon U‐Pb and 40 Ar/ 39 Ar dating of metamorphic and igneous Neoarchean to Permian mid‐to upper‐crustal rocks exhumed along a north−south corridor across the western NCA and its retroarc foreland. The results show that the mid‐ to upper‐crust of the western part of the NCA has been strongly affected by thermal modifications during arc construction in the late Paleozoic, while the retroarc foreland remained thermally stable. Our results first reveal an unusually warm upper‐crust around Bayan Obo during the late Paleozoic with high geothermal gradients of 50.0 ± 8.3 to 88.3 ± 8.3°C/km and strong thermal modification of the upper‐crust during arc construction. This unusually warm upper‐crust and high geothermal gradients resulted in intensive thermal perturbations and recrystallization of REE‐bearing minerals in the Bayan Obo deposit, as well as formation of high‐grade REE ores and complete or partial resetting (U‐)Th‐Pb isotopic systems of REE minerals. Our identification of the unusually warm upper‐crust and high geothermal gradients in the western part of the NCA provides important constraints on genesis, timing and thermal modification of the giant Bayan Obo deposit, as well as other REE deposits with complex isotopic ages.

Orogeny

10.1029/2022ea002539

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Citations (4)

The giant Upper Yangtze Pb–Zn province in SW China: Reviews, new advances and a new genetic model

Journal of Asian Earth Sciences (2017)

Jia‐Xi Zhou Zhenzhong Xiang Mei‐Fu Zhou Yuexing Feng Kai Luo

Dolostone

Large igneous province

Isotope Geochemistry

Early Triassic

10.1016/j.jseaes.2017.12.032

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Citations (113)

Metasomatic modification of Sr isotopes in apatite as a function of fluid chemistry

Geochimica et Cosmochimica Acta (2022)

Xiaochun Li Daniel E. Harlov Mei‐Fu Zhou Hao Hu

Fluorapatite

Metasomatism

Simulated body fluid

10.1016/j.gca.2022.02.025

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Citations (17)

Geochemistry and Tectonic Significance of Basaltic Lavas in the Neoproterozoic Yanbian Group, Southern Sichuan Province, Southwest China

International Geology Review (2007)

Wei‐Hua Sun Mei‐Fu Zhou Jun‐Hong Zhao

The ~840 Ma Yanbian Group on the western margin of the Yangtze block, Southwest China, is a >6 km thick, volcanic-sedimentary sequence consisting of basaltic lavas + associated cherty layers in the lower part, and flysch deposits in the upper part. The lavas have variable bulk-rock compositions: SiO2 ranges from 45.3 to 50.7 wt%, Al2O3 from 12.8 to 16.8 wt%, and TiO2 from 1.3 to 2.9 wt%. Although the incompatible trace elements, including Nb, Ta, Zr, Hf, Ti, and HREE, are similar to those of MORB, the lavas show features of island-arc tholeiites with pronounced enrichments in Rb, Ba, U, Sr, and Pb. They are characterized by low initial 87Sr/86Sr ratios (0.7030 to 0.7040) and strongly depleted ∊Nd(t) values (+3.8 to +8.0). These geochemical features of the basaltic lavas suggest derivation from an N-MORB-type mantle source modified by slab-derived fluids and formation in an extensional back-arc basin setting. This conclusion supports an arc setting along the western margin of the Yangtze block during Neoproterozoic time. Therefore, the western margin of the Yangtze block can be correlated with the northeastern margin of the Greater India plate, both being an active arc above an eastward subduction zone at that time.

Island arc

10.2747/0020-6814.49.6.554

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Citations (46)

Determination of Pt, Pd, Ru and Ir in geological samples by ID-ICP-MS using sodium peroxide fusion and Te co-precipitation

GEOCHEMICAL JOURNAL (2003)

Liang Qi D. Conrad Grégoire Mei‐Fu Zhou John Malpas

A method is proposed for the determination of Pt, Pd, Ru and Ir in geological samples by isotope dilution-inductively coupled plasma mass spectrometry (ICP-MS). Mono-isotopic elements Rh and Au are determined by external calibration using Lu as the internal standard. Sodium peroxide fusion in corundum crucibles (instead of glassy carbon or zirconium crucibles) is used to decompose the samples. After dissolution of the fused cake in water, the solution is spiked with enriched stable isotopes of Pt, Pd, Ru and Ir, and then acidified with HCl. This solution is then evaporated to dryness promoting the formation of anhydrous silicate from colloidal material. PGEs and Au are then pre-concentrated by Te co-precipitation. The reagents HCl and SnCl2 are purified by Te co-precipitation. PGE blank levels are thus only derived from the Na2O2 which has PGE concentrations of <0.02 ng/g. Lutetium is added as the internal standard to correct for instrument drift and matrix suppression effects for the determination of the mono-isotopic elements. Method detection limits range from 0.02 to 0.3 ng/g. The results obtained for the CCRMP (CANMET, Ottawa, Canada) certified reference materials WGB-1 (gabbro), TDB-1 (diabase), UMT-1 (ultramafic ore tailings), WPR-1 (altered peridotite), WMG-1 (mineralized gabbro), and WMS-1 (massive sulphide) are in good agreement with certified values.

Certified reference materials

Isotope dilution

10.2343/geochemj.37.557

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Citations (30)

Coupled evolution of Neoproterozoic arc mafic magmatism and mantle wedge in the western margin of the South China Craton

Contributions to Mineralogy and Petrology (2019)

Jun‐Hong Zhao Mei‐Fu Zhou Yuan–Bao Wu Jianping Zheng Wei Wang

10.1007/s00410-019-1573-7

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Citations (55)

Using Multiphase Solid Inclusions to Constrain the Origin of the Baima Fe–Ti–(V) Oxide Deposit, SW China

Journal of Petrology (2014)

Ping‐Ping Liu Mei‐Fu Zhou Wei Terry Chen Marijn Boone Veerle Cnudde

Multiphase solid inclusions within cumulus silicates, particularly olivine, in Fe–Ti oxide ores from the Lower Zone of the Baima intrusion, Emeishan large igneous province, SW China, have been identified for the first time using 2-D scanning electron microscope and 3-D high-resolution X-ray computed tomography. These inclusions are spherical to subspherical and range from 100 to 300 µm in diameter. They are composed dominantly of titanomagnetite and ilmenite with minor apatite, hornblende, phlogopite and pyrrhotite. The titanomagnetite in the inclusions has a low Cr content (<700 ppm) similar to the interstitial titanomagnetite, suggesting that these inclusions cannot be early crystallized mineral aggregates. In contrast, the spherical shape of these inclusions provides evidence of early trapped liquids from which these minerals crystallized. Based on the composition and modal proportions of the daughter mineral phases within the inclusions, the trapped liquids are estimated to have 82·1–59·6 wt % FeOT, 11·4–18·5 wt % TiO2, 2·69–6·12 wt % Al2O3, 1·40–4·47 wt % MgO, 0·87–4·93 wt % SiO2 and ∼1 wt % volatiles including F, S, Cl, P and H2O. Such a liquid composition deviates substantially from that of the slightly evolved ferrobasaltic magmas inferred to be parental to the Fe–Ti–(V) oxide-bearing mafic–ultramafic intrusions of the Emeishan large igneous province. It is thus speculated that these trapped liquids are immiscible Fe–Ti-rich melts formed upon cooling of ferrobasaltic magma. The net-textured and disseminated oxide ores have titanomagnetite compositions similar to those in the inclusions, suggesting that the oxide ores of the Baima intrusion also formed from Fe–Ti-rich melts immiscibly separated from ferrobasaltic magmas. We propose that immiscible Fe–Ti-rich liquids with high density percolated down through crystal-bearing silicate magma and crystallized an interconnected Fe–Ti oxide network interstitial to olivine, plagioclase and clinopyroxene. This study highlights that immiscible separation of Fe–Ti-rich liquids from ferrobasaltic magmas is an important mechanism in the formation of magmatic Fe–Ti–(V) oxide deposits hosted in mafic–ultramafic layered intrusions.

Ilmenite

Phlogopite

Chromite

Pyroxene

Melt inclusions

Titanite

10.1093/petrology/egu012

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Citations (57)