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| 1 | In situ calcite U-Pb geochronology by high-sensitivity single-collector LA-SF-ICP-MS显示文摘U-Pb geochronology of calcite using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is an emerging method,with potential applications to a vast array of geological problems.Due to the low levels of U and Pb in calcite,measurement using higher-sensitivity instruments,such as sector field (SF) ICP-MS,have advantages over more commonly used quadrupole (Q) ICP-MS instruments.Using a Thermo Element XR ICP-MS,we demonstrate that the Jet+X cone combination with the N_(2) enhancement technique provides the best sensitivity for measuring U and Pb isotopes.This higher sensitivity improves the precision of calcite U-Pb isotope measurements,and permits dating at high spatial resolutions (<110μm) and for samples containing low contents of^(238)U (<1μg g^(–1)) and/or^(207)Pb (i.e.,young samples<10 Ma).Using a spot size of 85μm with a low fluence (~2.0 J cm^(–2)),the laser-induced elemental fractionation of^(206)Pb/^(238)U in the NIST SRM 614,ARM-3 and WC-1 reference materials are insignificant (<2.2%).Adopting the optimized instrument parameters,we analysed four commonly-used calcite U-Pb reference materials (WC-1,Duff Brown Tank,JT,and ASH-15).The results match well with published isotope dilution data,demonstrating the reliability of our technique.ARM-3,an andesitic glass,is shown to be an appropriate reference material for both^(207)Pb/^(206)Pb calibration and instrument optimization because of its moderate contents of U(~3.75μg g^(–1)) and Pb (~12.7μg g^(–1)).We further demonstrate that the image-guided approach using LA-ICP-MS elemental mapping is an efficient tool in obtaining robust ages. | Shitou WU Yueheng YANG Nick M.W.ROBERTS Ming YANG Hao WANG Zhongwu LAN Bohang XIE Tianyi LI Lei XU Chao HUANG Liewen XIE Jinhui YANG Fuyuan WU | 2022 | Science China Earth Sciences2022，65，6： | 6 |
| 2 | Megaripples from the Mesoproterozoic of the Kimberley region,northwestern Australia and its geological implications | Lan Zhongwu 1,2,3,,Zhong-Qiang Chen 2,4,1.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2.School of Earth and Environment,The University of Western Australia,Australia 3.Key Lab of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 4.State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences (Wuhan),Wuhan 430074,China | 2012 | Journal of Palaeogeography2012，1，1： | 4 |
| 3 | WANCE:A possibly Volcanism-Induced Ediacaran Carbon Isotope Excursion显示文摘Four carbonate carbon isotope(δ^(13)C_(carb))excursions are recognized in the Ediacaran Doushantuo Formation in South China,the genesis of which remains disputed.Whereas three of these δ^(13)C_(carb) excursions possibly record secular biogeochemical variations,the other one,namely Weng'an negative carbonate carbon isotope excursion(WANCE)with an age of ca.620 Ma occurs mainly within the northern Yangtze Platform.In this study,a SIMS U-Pb age of ca.620 Ma was documented from continental rift volcanism within the adjacent South Qinling terrane.Its temporal overlap with WANCE suggests a possible causal link.Volcanism-induced seafloor uplift may have prompted DOC oxidation in surficial oxygenated oceans,inducing the occurrence of WANCE. | Zhongwu Lan | 2022 | Journal of Earth Science2022，33，3： | 2 |
| 4 | Calcite U-Pb Geochronology Revealing Late Ediacaran-Early Paleozoic Hydrothermal Alteration in the Stenian-Tonian Carbonate of Northeastern North China Craton显示文摘Two calcite LA-ICP-MS U-Pb ages of 534±26 Ma(MSWD=5.9)and 456±43 Ma(MSWD=3.8)were obtained from the Nanfen Formation,Xihe Group in the southern Liaoning Prov-ince,northeastern China,which significantly postdate the theoretical depositional age of sampling hori-zon.This means they represent timing of post-depositional hydrothermal event possibly induced by syn-chronous far-field magmatism in the South Qinling.Occurrence of common Pb enriched muddy compo-nents coupled with input of'mantle'-like common Pb could account for the relatively low U contents and high common Pb contents in the dated muddy carbonates.We recommend that micro-domains of carbonates are prescreened by rapid in situ carbonate U-Pb geochronology to demonstrate whether they are of primary or secondary origin before utilizing them for chemostratigraphic study. | Rong Cao Hanqing Zhao Zhongwu Lan | 2023 | Journal of Earth Science2023，34，6： | 1 |
| 5 | The genome sequence of star fruit(Averrhoa carambola)显示文摘Oxalidaceae is one of the most important plant families in horticulture,and its key commercially relevant genus,Averrhoa,has diverse growth habits and fruit types.Here,we describe the assembly of a high-quality chromosomescale genome sequence for Averrhoa carambola(star fruit).Ks distribution analysis showed that A.carambola underwent a whole-genome triplication event,i.e.,the gamma event shared by most eudicots.Comparisons between A.carambola and other angiosperms also permitted the generation of Oxalidaceae gene annotations.We identified unique gene families and analyzed gene family expansion and contraction.This analysis revealed significant changes in MADS-box gene family content,which might be related to the cauliflory of A.carambola.In addition,we identified and analyzed a total of 204 nucleotide-binding site,leucine-rich repeat receptor(NLR)genes and 58 WRKY genes in the genome,which may be related to the defense response.Our results provide insights into the origin,evolution and diversification of star fruit. | Shasha Wu Wei Sun Zhichao Xu Junwen Zhai Xiaoping Li Chengru Li Diyang Zhang Xiaoqian Wu Liming Shen Junhao Chen Hui Ren Xiaoyu Dai Zhongwu Dai Yamei Zhao Lei Chen Mengxia Cao Xinyu Xie Xuedie Liu Donghui Peng Jianwen Dong Yu-Yun Hsiao Shi-lin Chen Wen-Chieh Tsai Siren Lan Zhong-Jian Liu | 2020 | Horticulture Research2020，7，1： | 1 |
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