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  • English  (4)
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  • 1
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    Isotopic Compositions (Li‐B‐Si‐O‐Mg‐Sr‐Nd‐Hf‐Pb) and Fe2+/ΣFe Ratios of Three Synthetic Andesite Glass Reference Materials (ARM‐1, ARM‐2, ARM‐3) (2021)
    In:  Geostandards and Geoanalytical Research
    Details
    Publication Date: 2021-11-26
    Description: To expand the newly developed ARM glasses as reference materials for in situ microanalysis of isotope ratios and iron oxidation state by a variety of techniques such as SIMS, LA-MC-ICP-MS and EPMA, we report Li-B-Si-O-Mg-Sr-Nd-Hf-Pb isotope data and Fe2+/ΣFe ratios for these glasses. The data were mainly obtained by TIMS, MC-ICP-MS, IR-MS and wet-chemistry colorimetric techniques. The quality of these data was cross-checked by comparing different techniques or by comparing the results from different laboratories using the same technique. All three glasses appear to be homogeneous with respect to the investigated isotope ratios (except for B in ARM-3) and Fe2+/ΣFe ratios at the scale of sampling volume and level of the analytical precision of each technique. The homogeneity of Li-B-O-Nd-Pb isotope ratios at the microscale (30–120 μm) was estimated using LA-MC-ICP-MS and SIMS techniques. We also present new EPMA major element data obtained using three different instruments for the glasses. The determination of reference values for the major elements and their uncertainties at the 95% confidence level closely followed ISO guidelines and the Certification Protocol of the International Association of Geoanalysts. The ARM glasses may be particularly useful as reference materials for in situ isotope ratio analysis.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 2
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    Changes in runoff and sediment in a typical catchment located in the Loess Plateau using a modelling methodology (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-06-05
    Description: Detecting changes in runoff and sediment in the Loess Plateau is a hot issue. The Kuye River located in the Loess Plateau was selected as a typical Basin. Based on the observed hydro-meteorological data during 1960—2014, there was a statistically significant increasing trend in annual mean temperature, an insignificant decreasing trend in annual precipitation, and significant decreasing trends in annual runoff and sediment. 1980 and 1999 were two breakpoints of the relationships among runoff, sediment and climatic factors. The ensemble modelling framework of runoff and sediment was constructed by the VIC model and eight sediment models based on machine learning algorithm. The Nash-Sutcliffe efficiency coefficient and correlation coefficient for monthly runoff and sediment simulation were higher than 0.6 and 0.7, respectively, that denoted acceptable performance. Based on the comparison between the reconstructed natural runoff and sediment versus observed values, the attribution of runoff and sediment changes were quantitatively analyzed. The results indicated that the contributions of climate change and human activities to runoff reduction in 1980—2014 were 25%-40% and 60%-75% respectively, and the contributions to sediment reduction were 15%-36% and 64-85%, respectively, compared with that in the natural period from 1960 to 1979. Human activities are the main reason for the decreases in runoff and sediment in the Kuye River basin. The related results could improve an innovative methodology to understand the attribution of runoff and sediment changes.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 3
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    Final assembly of Gondwana enhances crustal metal (HREE and U) endowment (2023)
    In:  Geochemical Perspectives Letters
    Details
    Publication Date: 2023-10-24
    Description: The South China Block hosts a variety of U and HREE mineralisation styles. The Yushui Cu deposit is located at a sedimentary unconformity and is enriched in HREEs and U. U-Pb ages of uraninite and xenotime indicate that the HREE miner- alisation is epigenetic and formed at ca. 223 ± 1 Ma. Ore petrography, elemental map- ping, and Nd isotope data suggest that HREEs and U were leached from the footwall sandstone and transported to the Cu deposit via oxidised basinal brines. U-Pb ages of detrital xenotime and zircon from the sandstone show that this sedimentary sequence was mainly derived from Silurian S-type granites, which were emplaced during Gondwana amalgamation. Rapid erosion formed clastic sedimentary rocks that con- tain accessory HREE-U minerals which could be remobilised by younger mineralising events. S-type granite magmatism during the final assembly of Gondwana established the crustal metal reservoir which was repeatedly tapped over geological history, including the modern formation of regolith hosted HREE deposits in South China. Given the global distribution of analogous S-type granites in other terranes globally, our study has exploration implica- tions outside of China. This will be enlightening for finding new HREE deposits, which is vital to support the transition to a low carbon footprint energy.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 4
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    Ore genesis of the Tieshajie Cu deposit: Implications for Cu mineralization in the Qin-Hang Metallogenic Belt, South China (2024)
    In:  Ore Geology Reviews
    Details
    Publication Date: 2024-04-08
    Description: The Tieshajie Cu deposit, located in the northeastern part of the Qin-Hang Metallogenic Belt (QHMB), South China, has long been regarded as a representative Meso-Neoproterozoic volcanogenic massive sulfide (VMS) deposit. Here we present a hydrothermal titanite U-Pb age, Re-Os and in-situ S-Cu isotope data for chalcopyrite to constrain the timing and ore genesis of the Tieshajie deposit. Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb dating of titanite from the disseminated Cu ore yielded a weighted mean 206Pb/238U age of 160.1 ± 4.4 Ma. Chalcopyrite from different ore types has low 187Os/188Os (0.85–3.60) and 187Re/188Os (46.1–614.0) ratios, combined with initial 187Os/188Os (0.74–2.00), excluding a mantle source. A Re-Os isochron age (188 ± 30 Ma) for five chalcopyrite samples is consistent with the titanite U-Pb age within errors. Moreover, the variations in Cu isotope compositions (δ65Cu: −1.13 to +0.12 ‰) and δ34S values (+3.8 to +7.7 ‰) of chalcopyrite are inconsistent with those reported from the ancient VMS deposits in previous studies. Therefore, our results are indicative of a Late Jurassic magmatic-hydrothermal origin instead of a VMS origin for the Tieshajie deposit. In combination with previous studies, we propose that the Tieshajie Cu deposit belongs to the distal part of the Mid-Late Jurassic (170–150 Ma) porphyry-skarn Cu mineralization event in the QHMB, likely triggered by the subduction of the Paleo-Pacific plate during the Late Mesozoic. This study also has new insights into the genesis of Cu mineralization in the QHMB and further provides implications for future exploration.
    Language: English
    Type: info:eu-repo/semantics/article
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