The Jenkyns Event,more widely known as the Toarcian Oceanic Anoxic Event(T-OAE),is marked by globally distributed negative carbon-isotope excursions,widespread oxygen depletion,and large-scale organic carbon burial,wh...The Jenkyns Event,more widely known as the Toarcian Oceanic Anoxic Event(T-OAE),is marked by globally distributed negative carbon-isotope excursions,widespread oxygen depletion,and large-scale organic carbon burial,which indicate major climate/environmental perturbations in Earth's surface systems during the Early Jurassic.Although extensive research has been conducted in European continental settings,particularly in the western peri-Tethys regions,the impacts of this event beyond Europe remains largely unexplored.Here,a multiapproach study including investigations into the sporepollen assemblages,pyrite framboids,clay minerals,total organic carbon(TOC)levels,and organic carbon isotope(δ13Corg)levels in a lacustrine borehole section(MED1)from the Yin'gen-Ejinaqi Basin,North China,provides evidence of the occurrence of the Jenkyns Event and its extensive sedimentary responses in the eastern Tethys terrestrial systems.Two distinct spore-pollen assemblages have been identified in MED1(drilling depth:982.4 m to 1267.5 m),with the Cycadopites-Protopinus-Osmundacidites assemblage in the lower part(1267.5 m to 1132.9 m)indicating a middle Early Jurassic age and the Classopollis assemblage in the upper part(1132.9 m to 985.7 m)suggesting a Toarcian age.Framboidal pyrite data suggest more anoxic conditions during the deposition of black mudstone and shale intercalations in the lower part of the Classopollis assemblage(1132.9 m to 1066.9 m),which combined with organic carbon enrichment and negativeδ13Corg excursions,are considered the paleoenvironmental response to the Jenkyns Event in the study area.Furthermore,the evolution of vegetation groups changed from plant groups characterized by bisaccate and cycad pollen,as well as fern spores,to vegetation groups represented by Cheirolepidiaceae pollen across the Jenkyns Event,as evidenced by sporepollen data,together with the clay mineral assemblage change characterized by a notable increase in illite at the expense of kaolinite,suggests that while a subtropical-temperate climate persisted,a change toward warmer and drier conditions most likely occurred in the early Toarcian in the study area.In contrast to the humidification evidenced in many coastal settings,this aridification trend in the Yin'gen-Ejinaqi Basin aligns with the conditions in many inland areas.It is hypothesized that the underlying cause of these divergent changes may be linked to certain patterns of spatially variable water availability on land,potentially driven by extremified hydrological conditions.展开更多
背景近年来儿童高尿酸血症(HUA)患病率升高,但临床重视程度不够,国内尚未建立公认的儿童血尿酸水平参考值,缺乏儿童HUA的诊断标准。目的探讨医院就诊患儿中血尿酸水平的分布特征、HUA的检出率。设计横断面调查。方法纳入2022年7月至2023...背景近年来儿童高尿酸血症(HUA)患病率升高,但临床重视程度不够,国内尚未建立公认的儿童血尿酸水平参考值,缺乏儿童HUA的诊断标准。目的探讨医院就诊患儿中血尿酸水平的分布特征、HUA的检出率。设计横断面调查。方法纳入2022年7月至2023年7月在郑州大学附属儿童医院行血尿酸检测的门诊及住院患儿,尿酸检测时年龄>28日龄且病历系统中有明确的疾病诊断。HUA诊断标准:男性和女性外周血尿酸水平分别为≥420μmol·L^(-1)和≥360μmol·L^(-1);血尿酸≥540μmol·L^(-1)为重度HUA。主要结局指标血尿酸水平及HUA检出率。结果38317例有血尿酸检测结果的患儿进入分析,男22534例、女15783例。①总体血尿酸中位数为259.3(211.1,316.1)μmol·L^(-1),男孩和女孩差异有统计学意义[262.7(213.0,322.3)μmol·L^(-1) vs 255.0(208.3,308.5)μmol·L^(-1),Z=10.365,P<0.001]。男孩血尿酸水平随年龄增加逐渐升高;女孩血尿酸水平在14岁前随年龄增加而升高,从14岁起逐渐下降,17岁起再次升高;除~8岁和~10岁外其他年龄段男孩的血尿酸水平均高于女孩。②共检出HUA 3719例(9.7%),男、女孩HUA检出率分别为7.7%(1730例)和12.6%(1989例),差异有统计学意义(χ^(2)=256.882,P<0.001)。男孩HUA检出率随年龄的增加而升高,~17岁达到峰值45.8%;女孩HUA检出率在~13岁前(25.7%)随年龄增加呈升高趋势,之后逐渐下降;男孩在~13岁前的HUA检出率低于女孩,~14岁后高于女孩。③重度HUA 284例(0.7%),男、女孩检出率分别为1.0%(222/22534)和0.4%(62/15783),差异有统计学意义(χ^(2)=44.269,P<0.001)。重度HUA在HUA患儿中的比例:除~7岁和~17岁外,其他年龄段男孩均高于女孩。④HUA检出率和重度HUA检出率均以内分泌系统疾病患儿最高(15.3%和1.8%),HUA检出率最高的病种为肥胖症(46.3%,320/691)。结论儿童HUA临床并不少见,儿童血尿酸水平有明显的年龄和性别差异,我国亟待建立不同年龄和不同性别儿童的血尿酸参考值,并在此基础上制定儿童HUA的诊断标准,以加强对HUA患儿的临床管理。展开更多
基金financially supported by China Geological Survey Project(DD20230138DD20242504)+1 种基金The National Natural Science Foundation of China(Grant Numbers 41702366)The Sinopec Project(34550000-21FW2099-0055)。
文摘The Jenkyns Event,more widely known as the Toarcian Oceanic Anoxic Event(T-OAE),is marked by globally distributed negative carbon-isotope excursions,widespread oxygen depletion,and large-scale organic carbon burial,which indicate major climate/environmental perturbations in Earth's surface systems during the Early Jurassic.Although extensive research has been conducted in European continental settings,particularly in the western peri-Tethys regions,the impacts of this event beyond Europe remains largely unexplored.Here,a multiapproach study including investigations into the sporepollen assemblages,pyrite framboids,clay minerals,total organic carbon(TOC)levels,and organic carbon isotope(δ13Corg)levels in a lacustrine borehole section(MED1)from the Yin'gen-Ejinaqi Basin,North China,provides evidence of the occurrence of the Jenkyns Event and its extensive sedimentary responses in the eastern Tethys terrestrial systems.Two distinct spore-pollen assemblages have been identified in MED1(drilling depth:982.4 m to 1267.5 m),with the Cycadopites-Protopinus-Osmundacidites assemblage in the lower part(1267.5 m to 1132.9 m)indicating a middle Early Jurassic age and the Classopollis assemblage in the upper part(1132.9 m to 985.7 m)suggesting a Toarcian age.Framboidal pyrite data suggest more anoxic conditions during the deposition of black mudstone and shale intercalations in the lower part of the Classopollis assemblage(1132.9 m to 1066.9 m),which combined with organic carbon enrichment and negativeδ13Corg excursions,are considered the paleoenvironmental response to the Jenkyns Event in the study area.Furthermore,the evolution of vegetation groups changed from plant groups characterized by bisaccate and cycad pollen,as well as fern spores,to vegetation groups represented by Cheirolepidiaceae pollen across the Jenkyns Event,as evidenced by sporepollen data,together with the clay mineral assemblage change characterized by a notable increase in illite at the expense of kaolinite,suggests that while a subtropical-temperate climate persisted,a change toward warmer and drier conditions most likely occurred in the early Toarcian in the study area.In contrast to the humidification evidenced in many coastal settings,this aridification trend in the Yin'gen-Ejinaqi Basin aligns with the conditions in many inland areas.It is hypothesized that the underlying cause of these divergent changes may be linked to certain patterns of spatially variable water availability on land,potentially driven by extremified hydrological conditions.
基金National Natural Science Foundation of China(Nos.51874351,52078495)Hunan Institute of Technology Introduced Talents Research Start-up Fund Project,China(No.HQ22016)。
文摘背景近年来儿童高尿酸血症(HUA)患病率升高,但临床重视程度不够,国内尚未建立公认的儿童血尿酸水平参考值,缺乏儿童HUA的诊断标准。目的探讨医院就诊患儿中血尿酸水平的分布特征、HUA的检出率。设计横断面调查。方法纳入2022年7月至2023年7月在郑州大学附属儿童医院行血尿酸检测的门诊及住院患儿,尿酸检测时年龄>28日龄且病历系统中有明确的疾病诊断。HUA诊断标准:男性和女性外周血尿酸水平分别为≥420μmol·L^(-1)和≥360μmol·L^(-1);血尿酸≥540μmol·L^(-1)为重度HUA。主要结局指标血尿酸水平及HUA检出率。结果38317例有血尿酸检测结果的患儿进入分析,男22534例、女15783例。①总体血尿酸中位数为259.3(211.1,316.1)μmol·L^(-1),男孩和女孩差异有统计学意义[262.7(213.0,322.3)μmol·L^(-1) vs 255.0(208.3,308.5)μmol·L^(-1),Z=10.365,P<0.001]。男孩血尿酸水平随年龄增加逐渐升高;女孩血尿酸水平在14岁前随年龄增加而升高,从14岁起逐渐下降,17岁起再次升高;除~8岁和~10岁外其他年龄段男孩的血尿酸水平均高于女孩。②共检出HUA 3719例(9.7%),男、女孩HUA检出率分别为7.7%(1730例)和12.6%(1989例),差异有统计学意义(χ^(2)=256.882,P<0.001)。男孩HUA检出率随年龄的增加而升高,~17岁达到峰值45.8%;女孩HUA检出率在~13岁前(25.7%)随年龄增加呈升高趋势,之后逐渐下降;男孩在~13岁前的HUA检出率低于女孩,~14岁后高于女孩。③重度HUA 284例(0.7%),男、女孩检出率分别为1.0%(222/22534)和0.4%(62/15783),差异有统计学意义(χ^(2)=44.269,P<0.001)。重度HUA在HUA患儿中的比例:除~7岁和~17岁外,其他年龄段男孩均高于女孩。④HUA检出率和重度HUA检出率均以内分泌系统疾病患儿最高(15.3%和1.8%),HUA检出率最高的病种为肥胖症(46.3%,320/691)。结论儿童HUA临床并不少见,儿童血尿酸水平有明显的年龄和性别差异,我国亟待建立不同年龄和不同性别儿童的血尿酸参考值,并在此基础上制定儿童HUA的诊断标准,以加强对HUA患儿的临床管理。
