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| 1 | 龙首山中段芨岭花岗岩体Sr-Nd-Pb同位素特征及意义显示文摘龙首山中段芨岭早古生代花岗岩体与碱交代型铀矿化关系密切,是龙首山花岗质岩浆活动带重要组成部分,但人们对芨岭岩体的成因、岩浆源区性质以及与铀成矿之间的关系还了解得不多.花岗岩体Sr-Nd-Pb同位素研究结果表明,不同期次花岗岩(早古生代第一次灰白色二长花岗岩、第二次肉红色二长花岗岩、晚古生代肉红色细粒(钾长)花岗岩)的(^(87)Sr/^(86)Sr)i值均介于大陆地壳范围内(0.706~0.718),同时有(87Sr/86Sr)i均值先升后降(0.707 12→0.710 00→0.707 89)、εNd(t)均值先降后增(-7.00→-8.09→-4.65)的特征.不同期次花岗岩体tDM2均值分别为1 735.50Ma、1 814.66Ma、1 737.50Ma,接近残留地壳年龄,表明岩体的主要物质来源为古元古代龙首山群地层,并有部分幔源组分或年轻地壳物质的加入.岩体的Pb同位素比值较高,灰白色二长花岗岩的^(206)Pb/^(204)Pb=18.328~19.240,^(207)Pb/^(204)Pb=15.549~15.619,208 Pb/204 Pb=38.390~39.075,μ=9.37~9.43(平均为9.40);肉红色二长花岗岩的^(206)Pb/^(204)Pb=30.209~43.529,^(207)Pb/^(204)Pb=16.097~25.076,^(208)Pb/^(204)Pb=39.107~39.420,μ=18.47~30.24(平均为24.355);肉红色细粒(钾长)花岗岩的^(206)Pb/^(204)Pb=19.071~19.767,^(207)Pb/^(204)Pb=15.577~25.438,208Pb/204Pb=38.682~42.593,μ=9.36~9.49(平均为9.41),显示为高放射性成因铅同位素特征,表明岩体的铅为混合来源但以壳源为主.Sr-Nd-Pb同位素对比研究表明,钠交代岩(矿石)的(^(87)Sr/^(86)Sr)i、εNd(t)与早古生代第二次侵入的肉红色斑状二长花岗岩极为相似,在(^(87)Sr/^(86)Sr)i-εNd(t)图解投影点也吻合,表明研究区碱交代型铀成矿主要与早古生代第二次侵入有关.其他期次花岗岩体同样具有高铀背景值,表明其可能也提供了一定的铀源. | 赵亚云 张树明 汤琳 尧宏福 杨春四 | 2016 | 地球科学(中国地质大学学报)2016，41，6： | 20 |
| 2 | 华北克拉通东部鲁西早白垩纪基性岩墙成因:来自锆石年龄、地球化学和Sr-Nd-Hf同位素的证据(英文)显示文摘中生代基性辉绿岩墙广泛分布于华北克拉通东部山东地区。本研究给出代表性岩墙的U-Pb锆石年龄、地球化学和Sr-Nd-Hf同位素证据,4个代表性锆石的LA-ICP-MS年龄范围处于121.9±0.6Ma和124.3±0.5Ma之间(早白垩纪)。岩石的主量元素组成变化较小,岩石富集轻稀土元素和大离子亲石元素(如,Rb、Ba、U、K和Pb),以及亏损高场强元素(如,Nb、Ta和Ti)。另外,基性岩墙具有相对一致的(87Sr/86Sr)i比值(~0.7098),负的εNd(t)值(-14.7^-14.5)、εHf(t)值(-31.4^-26.7)和高的Hf模式年龄(tDM1=1817~2024Ma)。研究显示基性岩墙来自富集岩石圈地幔的部分熔融作用,并在上升侵位过程中经历了一定程度的地壳混染作用影响。总体研究表明,基性岩墙的成因机制与扬子克拉通与华北克拉通的碰撞有关,岩浆源区为晚中生代前受俯冲扬子地壳沉积物交代后的富集岩石圈地幔。 | 刘燊 冯彩霞 翟明国 胡瑞忠 赖绍聪 陈俊瑾 颜军 | 2016 | 岩石学报2016，32，3： | 10 |
| 3 | 龙首山中段加里东期花岗岩浆作用与铀成矿作用研究述评显示文摘龙首山中段广泛出露加里东期花岗质岩体,是龙首山花岗质岩浆活动带的重要组成部分,加里东期花岗质岩浆活动与铀成矿(尤其是碱交代型铀矿化)关系密切。本文通过综合分析前人研究成果并结合项目组认识,系统总结了龙首山地区铀成矿带内加里东期花岗岩浆作用特征和铀成矿作用特征,在此基础上探讨了该区加里东期岩浆作用与铀成矿作用之间的关系。认为该区加里东期花岗岩浆作用与铀成矿(尤其是碱交代型铀矿化)关系十分密切,既为铀成矿提供主要铀源,也为铀成矿提供热源。同时认为该区在岩浆岩成岩成矿时代、成岩成矿构造环境、成矿物质来源等方面的研究程度较低。 | 赵亚云 张树明 汤琳 尧宏福 | 2015 | 甘肃地质2015，24，2： | 6 |
| 4 | 郯庐断裂带中部基性岩墙成因:K-Ar年代学、地球化学和Sr-Nd同位素证据显示文摘为查明郯庐断裂带中部基性岩墙的形成机制,对其开展了岩石学、K-Ar年代学、元素地球化学和Sr-Nd同位素研究。研究表明,研究区基性岩墙属于碱性粗玄岩系列,且为晚中生代白垩纪(122.2±2.8~128.3±2.4Ma)岩浆活动的产物。基性岩墙主量素组成范围较窄,富集Rb、Ba、U、Pb和Eu、亏损Nb、Ta和Ti,具有较高的(^(87)Sr/^(86)Sr)i初始比值(0.7068~0.7104)和负的εNd(t)值(-15.2^-16.2)。矿物学和地球化学研究显示,基性岩墙为石榴石二辉橄榄岩地幔低程度(<5.0%)部分熔融作用的产物,形成过程经历了橄榄石、单斜辉石和角闪石的分离结晶作用,同时受到一定程度太古-元古代物质混染作用的影响。富集源区形成机制与榴辉岩化下地壳拆沉作用及强烈的交代作用有密切的联系。 | 郭壮 李华侨 彭昊 冯彩霞 陈俊瑾 刘燊 郭晓磊 冯强 | 2016 | 矿物岩石地球化学通报2016，35，3： | 3 |
| 5 | Geochemistry and Sr-Nd-Pb Isotopes of the Granites from the Hashitu Mo Deposit of Inner Mongolia, China: Constraints on Their Origin and Tectonic Setting显示文摘The Hashitu molybdenum deposit is located in the southern part of the Great Hinggan Range,NE China.Molybdenum mineralization is hosted by and genetically associated with monzogranite and porphyritic syenogranite.Sr-Nd-Pb isotopes of the intrusions show that the porphyritic syenogranite has initial^(87)Sr/^(86)Sr ratios of 0.70418-0.70952,ε_(Nd)(t)values of 1.3 to 2.1(t=143Ma),^(206)Pb/^(204)Pb ratios of 19.191-19.573,^(207)Pb/^(204)Pb ratios of 15.551-15.572,and^(208)Pb/^(204)Pb ratios of38.826-39.143.The monzogranite has initial^(87)Sr/^(86)Sr ratios of 0.70293-0.71305,ε_(Nd)(t)values of 1.1 to2.0(t=147 Ma),^(206)Pb/^(204)Pb ratios of 19.507-20.075,^(207)Pb/^(204)Pb ratios of 15.564-15.596,and^(208)Pb/^(204)Pb ratios of 39.012-39.599.The calculated Nd model ages(T_(DM))for monzogranite and porphyritic syenogranite range from 866 to 1121 Ma and 795 to 1020 Ma,respectively.The granitic rocks in the Hashitu area have the same isotope range as granites in the southern parts of the Great Hinggan Range.The isotope composition indicates that these granites are derived from the partial melting of a juvenile lower crust originating from a depleted mantle with minor contamination by ancient continental crust.The integrating our results with published data and the Late Mesozoic regional tectonic setting of the region suggest that the granites in the Hashitu area formed in an intra-continent extensional setting,and they are related to the thinning of the thickened lithosphere and upwelling of the asthenosphere. | DING Chengwu DAI Pan BAGAS Leon NIE Fengjun JIANG Sihong WEI Junhao DING Chengzhen ZUO Pengfei ZHANG Ke | 2016 | Acta Geologica Sinica(English Edition)2016，90，1： | 3 |
| 6 | Geochemical constraints on the origin of Early Cretaceous alkaline intrusions and its tectonic implication,Sulu Orogenic Belt,Eastern North China Craton显示文摘Post-orogenic alkaline intrusions from the Sulu Orogenic Belt of eastern North China Craton consist of A-type granites.In this study,we report U-Pb zircon ages,geochemical data,Sr-Nd-Pb,and zircon Hf isotopic data for these rocks.The LA-ICP-MS U-Pb zircon analyses yield consistent ages ranging from 127.1±2.4 to 119.5±4.8 Ma for four samples.The alkaline rocks are characterized by high total alkalis(K2 O+Na2 O=8.32-10.11 wt%),light rare-earth element enrichment,and heavy rare-earth element depletion,with a wide range(La/Yb)N values(20-48),moderate negative Eu anomalies(Eu/Eu*=0.50-0.74),enrichment in large-ion lithophile elements(LILEs,i.e.,Rb,Th,U and Pb),and depletion in Ba,Sr and high field strength elements(HFSEs,i.e.,Nb,Ta,and Ti),high(87Sr/86Sr)i ranging from 0.708 to 0.7089,low sNd(t)values from-19.4 to-16.8,(206Pb/204Pb)i=16.751-16.935,(207Pb/204Pb)i=15.381-15.535,(208-Pb/204Pb)i=37.472-37.838,negativeεHf(t)values between-21.3 and-25.7 for the magmatic zircons,and larger TDM2 model ages from 2.5 to 2.8 Ga.These results suggest that the rocks were derived from a common enriched lithospheric mantle source that was metasomatized by foundered lower crustal eclogitic materials before magma generation.Furthermore,the geochemical and isotopic feature implies that the primary magma of these rocks originated through partial melting of ancient lithospheric mantle that was variably hybridized by melts derived from lower crust eclogite.These rocks in this study may have been generated by subsequent fractionation of potassium feldspar,plagioclase,ilmenite,and/or rutile.However,negligible crustal contamination occurred during the diagenesis process. | Shen Liu Caixia Feng Yan Fan Kairui Tai Tianjing Gao Ian M.Coulson | 2020 | Acta Geochimica2020，39，5： | 1 |
| 7 | Mantle plume:the dynamic setting of the origin of Early Paleozoic mafic dykes in Ziyang,Shaanxi Province,Southern Qinling Block,China显示文摘The mafic dykes(dolerites)during the Early Paleozoic are widely spread in Langao-Ziyang,southern Qiling Block,and the investigation on these dykes are very important.Previous studies have mainly focused on the Silurian mafic dykes;however,research on the Earlier Paleozoic mafic dykes is relatively weak at present.Therefore,the overall understanding of the mantle source and genetic dynamic setting during the Early Paleozoic in this area is lacking.To study the accurate age and origin of the Early Paleozoic mafic dykes in Ziyang,southern Shaanxi Province,the mafic dykes from dabacunand Qinmingzhai were selected and the petrology,zircon U-Pb chronology,geochemistry,and Sr-Nd-Hf isotopes were studied.Analysis indicates that the mafic dykes studied are mainly composed of dolerite,and they are the products of the Early Ordovician(475.8-480.7 Ma).Furthermore,the dolerites belong to alkaline rock series,and they are characterized by enrichment in LREE,Rb,Ba,Sr,Nb,(87Sr/86Sr)i=0.7020-0.7050,εNd(t)=3.0-4.0),εHf(t)=4.5-12.1,176Hf/177Hf=0.282681-0.282844.This suggests that the mafic dyke were derived from the partial melting of a depleted lithospheric mantle,and the genetic process is mainly controlled by the mantle plume based on the discussion of the genetic model.Furthermore,the genetic process experienced the separation and crystallization of olivine and clinopyroxene at the same time,with little crustal contamination. | Xiaoqing Chen Shen Liu Caixia Feng Ian M.Coulson Yan Fan Kairui Tai Tianjing Gao Siyuan Zhang | 2020 | Acta Geochimica2020，39，3： | 0 |
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