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| 1 | 低铀碳酸盐矿物的LA-MC-ICPMS微区原位U-Pb定年方法显示文摘碳酸盐矿物的同位素年代学研究具有广阔的应用前景,但理想样品少、定年难度大(尤其是低铀样品)等因素限制了该方法的发展.本研究利用激光剥蚀多接收电感耦合等离子体质谱技术(LA-MC-ICPMS),建立了针对低铀碳酸盐矿物的微区原位U-Pb同位素定年方法.通过LA-ICPMS预扫描,可以快速筛选出适合定年的样品和最佳剥蚀点,再借助为实现低铀含量的精确测量而对接收器配置优化设计的Nu Plasma Ⅱ MC-ICPMS进行碳酸盐矿物的U-Pb年龄测定.此外,通过两种已报道的碳酸盐矿物标样ASH15和WC-1,标定出一种更加均一且适用对象更广的实验室内部标样AHX-1a,其与国际标样长期对比测量获得的年龄加权平均值为209.8±1.3Ma(2S总,n=21,MSWD=2.7).此年龄结果是在半年内不同时期对样品靶不同部位21次独立标定的年龄结果的加权平均值,每一次对测约有50~150组数据点,总共2000多组数据点.与此同时,为了继续寻找其他理想碳酸盐矿物标样,更进一步的同位素稀释法标定工作还有待开展. | 程婷 Jianxin Zhao Yuexing Feng 潘文庆 刘敦一 | 2020 | 科学通报2020，65，2： | 15 |
| 2 | Degree of Brine Evaporation and Origin of the Mengyejing Potash Deposit:Evidence from Fluid Inclusions in Halite显示文摘The Mengyejing potash deposit is located in the southern port of the Simao Basin, Yunnan Province, and is hosted in mid-Cretaceous strata. The chemical compositions of fluid inclusions in halite crystals, collected from the level-610 adit in the deposit, were analysed by laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS). The results show that the brine is of the Na-K-Mg-Ca-Cl type and has K concentrations that are distinctly higher than those of Mg and Ca, unlike normal brines associated with Cretaceous halite. The high K concentrations indicate that the degree of evaporation of the ancient Mengyejing saline lake was very high, reaching the sylvite deposition stage but rarely reaching the carnallite deposition stage. The trajectory of the H and O isotopic compositions of the brines in the halite-hosted fluid inclusions corresponds to intense evaporation, indicating that the net evaporation exceeded the net inflow of brines. These brine compositions in halite-hosted fluid inclusions were likely formed by the dissolution of previously deposited K-bearing minerals by fresh continental and/or seawater, forming a type of modified seawater, with deep hydrothermal fluids potentially supplying additional potassium. The basin likely experienced multiple seawater incursion, dissolution and redeposition events in a high-temperature environment with high evaporation rates. | SHEN Lijian LIU Chenglin WANG Licheng HU Yufei HU Mingyue FENG Yuexing | 2017 | Acta Geologica Sinica(English Edition)2017，91，1： | 9 |
| 3 | 方解石原位U-Pb测年结合磷灰石裂变径迹方法约束鄂尔多斯盆地西南部构造演化显示文摘鄂尔多斯盆地下古生界油气资源丰富,盆地西南部下古生界海相碳酸盐岩地层沉积厚度大、有机质丰度较高,烃源岩热演化达到过成熟生干气阶段,但是构造演化缺乏深入研究,早期构造事件具体时限是一个亟待解决的关键科学问题。在详细的野外调查、显微结构特征、原位微量元素分析和区域沉积-埋藏演化历史的约束下,结合下古生界碳酸盐岩地层及其断裂破碎带内次生方解石原位U-Pb测年与磷灰石裂变径迹时间-温度曲线模拟结果,揭示了鄂尔多斯盆地西南部晚奥陶世、晚三叠世、晚侏罗世和早白垩世末期—新生代以来的4期构造事件。结果表明研究区晚奥陶世(452±13)Ma存在一期热液改造事件,可能与加里东期原特提斯洋俯冲闭合密切相关;印支期(214±22)Ma的断裂活动是引起区域构造-热事件的重要原因,印支期构造事件规模有限;燕山期和喜马拉雅期构造活动强烈,造成鄂尔多斯盆地西南部大幅度隆升和强烈剥蚀。盆地西南部多阶段复杂的构造演化历史导致油气保存条件破坏严重,对寻找古生界天然气藏不利,应重视盆地天然气保存条件的研究。研究结果对鄂尔多斯盆地古生界油气勘探工作有重要指导意义。将低温热年代学与断裂带方解石原位U-Pb定年相结合分析构造演化的新思路,为解析复杂叠合盆地盆缘带构造演化及其后期改造过程的研究提供了新途径。 | 杨鹏 任战利 Jianxin Zhao Ai Duc Nguyen Yuexing Feng 祁凯 王琨 | 2021 | 石油与天然气地质2021，42，5： | 7 |
| 4 | Testing coral paleothermometers(B/Ca, Mg/Ca, Sr/Ca, U/Ca and δ^(18)O) under impacts of large riverine runoff显示文摘Sea surface temperature(SST) proxies including B/Ca, Mg/Ca, Sr/Ca, U/Ca and δ18O were analyzed in the skeleton of a Porites coral collected from the Zhujiang River(Pearl River) Estuary(ZRE). These geochemical proxies are influenced by river runoff and this area of the northern South China Sea is strongly affected by seasonal freshwater floods. We assessed the robustness of each SST proxy through comparison with the local instrumental SST. Coral Sr/Ca shows the highest correlation with SST variations(r2=0.59), suggesting Sr/Ca is the most robust SST proxy. In contrast, coral δ18O(r2=0.46), B/Ca(r2=0.43) and U/Ca(r2=0.41) ratios were only moderately correlated with SST variations, suggesting that they are disturbed by some other factors in addition to SST. The poor correlation(r2=0.27) between SST and Mg/Ca indicates that Mg/Ca in coral skeletons is not a simple function of SST variations. This may ultimately limit the use of Mg/Ca as a coral paleothermometer. | CHEN Tianran YU Kefu ZHAO Jianxin YAN Hongqiang SONG Yinxian FENG Yuexing CHEN Tegu | 2015 | Acta Oceanologica Sinica2015，34，8： | 4 |
| 5 | LA-ICPMS in-situ U-Pb Geochronology of Low-Uranium Carbonate Minerals and Its Application to Reservoir Diagenetic Evolution Studies显示文摘Reconstruction of the diagenetic evolution of reservoirs is one of the most significant tasks in oil and gas exploration and development.Assessing the accurate timing of diagenetic events is critical to better understand the process of reservoir evolution,but the isotope dating of diagenetic events is technically challenging.This paper uses three case studies in the sedimentary basins in China to demonstrate the promising application of recently developed LA-(MC)-ICPMS in-situ U-Pb geochronology.Our results show that the new U-Pb dating method provides a reliable and efficient chronological approach to determine the absolute ages of diagenetic events.For example,the U-Pb age data of the Cambrian carbonate reservoir in the Tarim Basin reveals three diagenetic events at 526±14,515±21,and 481±4.6 Ma,respectively.It is worth noting that microscopic observations are particularly important for improving the success rate of U-Pb dating.In addition,the recent progress and future prospects in the in-situ U-Pb dating method are also discussed in this study,suggesting that this method is currently hindered by the lack of international carbonate standards for data correction. | Entao Liu Jian-Xin Zhao Hua Wang Songqi Pan Yuexing Feng Qianglu Chen Faye Liu Jiasheng Xu | 2021 | Journal of Earth Science2021，32，4： | 3 |
| 6 | High-quality genome assembly of Huazhan and Tianfeng,the parents of an elite rice hybrid Tian-you-hua-zhan显示文摘High-quality rice reference genomes have accelerated the comprehensive identification of genome-wide variations and research on functional genomics and breeding.Tian-you-hua-zhan has been a leading hybrid in China over the past decade.Here,de novo genome assembly strategy optimization for the rice indica lines Huazhan(HZ)and Tianfeng(TF),including sequencing platforms,assembly pipelines and sequence depth,was carried out.The PacBio and Nanopore platforms for long-read se-quencing were utilized,with the Canu,wtdbg2,SMARTdenovo,Flye,Canu-wtdbg2,Canu-SMARTdenovo and Canu-Flye assemblers.The combination of PacBio and Canu was optimal,considering the contig N50 length,contig number,assembled genome size and polishing process.The assembled contigs were scaffolded with Hi-C data,resulting in two“golden quality”rice reference genomes,and evaluated using the scaffold N50,BUSCO,and LTR assembly index.Furthermore,42,625 and 41,815 non-transposable element genes were annotated for HZ and TF,respectively.Based on our assembly of HZ and TF,as well as Zhenshan97,Minghui63,Shuhui498 and 9311,comprehensive variations were identified using Nipponbare as a reference.The de novo assembly strategy for rice we optimized and the“golden quality”rice genomes we produced for HZ and TF will benefit rice genomics and breeding research,especially with respect to uncovering the genomic basis of the elite traits of HZ and TF. | Hui Zhang Yuexing Wang Ce Deng Sheng Zhao Peng Zhang Jie Feng Wei Huang Shujing Kang Qian Qian Guosheng Xiong Yuxiao Chang | 2022 | Science China(Life Sciences)2022，65，2： | 2 |
| 7 | High-precision U-series ages of transported coral blocks on Heron Reef (southern Great Barrier Reef) and storm activity during the past century显示文摘 | Kefu Yu Jianxin Zhao George Roff Matthew Lybolt Yuexing Feng Tara Clark Shu Li | 2012 | Palaeogeography, Palaeoclimatology, Palaeoecology2012，，： | 1 |
| 8 | Syn-Faulting Calcite Ages:Constraint for the Late Mesozoic Deformation of the Ningzhen Mountain,Eastern China显示文摘It is difficult to date a brittle fault because of the absence of effective dating methods.Recently,calcite U-Pb dating has drawn the attention of many researchers and has been successfully applied to constrain the age of brittle deformation.The South China Block(SCB)has experienced multiphase deformations characterized by widespread brittle faults and folds,which has led to significant debate on the Mesozoic dynamic mechanism and deformational phases.A syn-faulting calcite vein that occurred in the Permian limestones of the Ningzhen Mountain region was analyzed using U-Pb dating and geochemistry techniques in this paper.The U-Pb dating results display multiphase activities with two mixed ages of 109.9±5.8 Ma(MSWD=46,n=231)and 117.2±2.4 Ma(MSWD=3.6,n=150).The age of 117.2±2.4 Ma likely represents the timing of the brittle faults.Trace elements and rare earth elements data indicate that these fault-related calcites are mainly derived from host limestones and unrelated to Cretaceous magmatic activity.These faults formed in a tectonic reactive period and dormant time of the adakitic magma in the Lower Yangtze region. | Jinbao Su Hongbing Tan Yuexing Feng Guoxing Qin | 2021 | Journal of Earth Science2021，32，6： | 0 |
| 9 | A Paleozoic mercury mineralisation event in South China:In situ U-Pb dating and chemical compositions of calcite from the Jianyan Hg deposit显示文摘The ages of hydrothermal Hg deposits are difficult to constrain because of the lack of suitable minerals for dating.The South China low-temperature metallogenic domain hosts numerous Hg deposits,including the Jianyan Hg deposit that is composed mainly of cinnabar and calcite.There are two stages of calcite in the deposit:syn-ore calcite(Cal-Ⅰ)and post-ore/barren calcite(Cal-Ⅱ).Cal-Ⅰis mainly euhedral-subhedral and fine-grained,has homogeneous grey luminescence,and is associated with cinnabar.Subhedral-anhedral Cal-Ⅱcrosscuts Cal-Ⅰand is relatively coarse-grained.The syn-ore Cal-Ⅰhas high U contents(0.1–1.3 ppm)and U/Pb ratios(up to 4.2),and is thus suitable for U-Pb dating.Using a laser ablation-inductively coupled plasma-mass spectrometer equipped with ion counters,we obtained a U-Pb age of 426.3±5.7 Ma(MSWD=1.5)for CalI.This age is interpreted to represent the timing of Hg mineralisation at Jianyan and is similar to ages of 440–400 Ma reported for many carbonate-hosted Pb-Zn and Ba-F deposits in South China.Based on the present results in combination with existing geochemical and geochronological data,we infer that these deposits belong to a Paleozoic Hg-Pb-Zn-Ba-F mineralisation system that was controlled by Caledonian tectonism. | Kai LUO Jiaxi ZHOU Alexandre CUGERONE Meifu ZHOU Yuexing FENG Zhongguo JIN Jianxin ZHAO | 2023 | Science China Earth Sciences2023，66，8： | 0 |
| 10 | Identification of natural allelic variation in TTL1 controlling thermotolerance and grain size by a rice super pan-genome∞显示文摘Continuously increasing global temperatures present great challenges to food security.Grain size,one of the critical components determining grain yield in rice(Oryza sativa L.),is a prime target for genetic breeding.Thus,there is an immediate need for genetic improvement in rice to maintain grain yield under heat stress.However,quantitative trait loci(QTLs)endowing heat stress tolerance and grain size in rice are extremely rare.Here,we identified a novel negative regulator with pleiotropic effects,Thermo‐Tolerance and grain Length 1(TTL1),from the super pan‐genomic and transcriptomic data.Loss‐of‐function mutations in TTL1 enhanced heat tolerance,and caused an increase in grain size by coordinating cell expansion and proliferation.TTL1 was shown to function as a transcriptional regulator and localized to the nucleus and cell membrane.Furthermore,haplotype analysis showed that hapL and hapS of TTL1 were obviously correlated with variations of thermotolerance and grain size in a core collection of cultivars.Genome evolution analysis of available rice germplasms suggested that TTL1 was selected during domestication of the indica and japonica rice subspecies,but still had much breeding potential for increasing grain length and thermotolerance.These findings provide insights into TTL1 as a novel potential target for the development of high‐yield and thermotolerant rice varieties. | Yarong Lin Yiwang Zhu Yuchao Cui Hongge Qian Qiaoling Yuan Rui Chen Yan Lin Jianmin Chen Xishi Zhou Chuanlin Shi Huiying He Taijiao Hu Chenbo Gu Xiaoman Yu Xiying Zhu Yuexing Wang Qian Qian Cuijun Zhang Feng Wang Lianguang Shang | 2023 | Journal of Integrative Plant Biology2023，65，12： | 0 |
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