A Compilation of Silicon,Rare Earth Element and Twenty‐One other Trace Element Concentrations in the Natural River Water Reference Material SLRS‐5 (NRC‐CNRC)

The natural river water certified reference material SLRS‐5 (NRC‐CNRC) was routinely analysed in this study for major and trace elements by ten French laboratories. Most of the measurements were made using ICP‐MS. Because no certified values are assigned by NRC‐CNRC for silicon and 35 trace element concentrations (rare earth elements, Ag, B, Bi, Cs, Ga, Ge, Li, Nb, P, Rb, Rh, Re, S, Sc, Sn, Th, Ti, Tl, W, Y and Zr), or for isotopic ratios, we provide a compilation of the concentrations and related uncertainties obtained by the participating laboratories. Strontium isotopic ratios are also given.     

Holocene overbank deposition in the drainage basin of Lake Khanka

Overbank deposits in the Komissarovka River valley consist of alternating silt, clay silt, sand, and soils produced by lacustrine, alluvial, and aeolian deposition and by soil formation. Silt and sand layers in the lower part of the section correlate with the events of Early Holocene transgression and Middle Holocene regression of Lake Khanka. Deposition in the lowermost reaches of the Komissarovka River provides a faithful record of local Holocene landscapes controlled by level changes in Lake Khanka.     

西藏甲玛-卡军果推-滑覆构造系特征

通过矿区填图和路线调查,结合室内研究,指出:①甲玛-卡军果推-滑覆构造系由印度-欧亚板块碰撞引发,具有递进变形、自盆地中心向边部推覆、新盖老等特点,强变形于50Ma±。②推覆体下盘为叶巴组构造岩系;推覆体由上侏罗统和下白垩统碳酸盐-碎屑沉积岩系构成,主体为轴面北倾的复式褶皱,自南而北分为前部带、中部带和后部带。滑覆构造系推覆形成的复背斜轴部高位岩块失稳向北滑覆形成,自南而北分为后部带、中部带和前部带。③导致矿区蚀变的主要岩浆活动发生于推覆强变形后的松弛期,上侵受近南北向基底断裂和推覆断裂联合控制,就位受控于前部带推-滑覆褶断系,其后发生多次构造-岩浆-成矿液叠加,造就甲玛铜多金属矿床。     

Numerical Simulation of 3D Borehole‐to‐Surface Electrical Method

The anomaly response characteristics of the vertical line‐source 3D borehole‐to‐surface model are simulated by an adaptive finite element method. The calculation shows that the anomaly in the radial direction is pressed and the closer to the source, the more pronounced, the anomaly is stretched in the direction perpendicular to the radius. Adding a B pole in the Y direction can offset the effect of stretching to some extent. The anomaly that is closer to the source of the profile is clearer than the anomaly that is far from the source. The research results are of great significance for guiding the practical application of the borehole‐to‐surface electrical method.     

Geology and Lead–Sulphur Isotope Compositions of the Tongyu Volcanic-Hosted Massive Sulphide Copper Deposit in the Western Part of the North Qinling Orogen, China

The Tongyu copper deposit, located in the western part of the North Qinling Orogen, China, is one of several volcanic-hosted massive sulphide(VHMS) deposits with industrial value and is also a typical example of mineralization related to the subduction and metallogenesis during the Caledonian orogeny. We conducted systematic lead-sulphur isotope geochemical analyses of the Tongyu deposit to understand the possible ore-forming material sources and tectonic settings. Twenty-six sulphide samples yielded clustered δ~(34)S_(CDT) values of 1.13‰-3.36‰, average 2.22‰, and show a tower-type distribution,implying that the sulphur of the Tongyu copper deposit mainly originated from a mantle source. The Pb isotope compositions of sulphides(~(206)Pb/~(204)Pb = 17.59225-18.56354, average 18.32020; ~(207)Pb/~(204)Pb =15.51770-15.69381, average 15.66217; ~(208)Pb/~(204)Pb= 37.99969-39.06953, average 38.52722) are close to the values of the volcanic host rocks(~(206)Pb/~(204)Pb= 18.10678-18.26293, average 18.21158; ~(207)Pb/~(204)Pb =15.63196-15.68188, average 15.65345; ~(208)Pb/~(204)Pb= 38.43676-38.56360, average 38.49171), thus consistent with the Pb in ores and volcanic host rocks having been derived from a common source that was island-arc Pb related to oceanic crust subduction. The northward subduction of the Palaeo-Qinling oceanic crust triggered dehydration of the slab, which generated a large amount of high-oxygen-fugacity aqueous hydrothermal fluid. The fluid rose into the mantle wedge, activated and extracted metallogenic material and promoted partial melting of the mantle wedge. The magma and ore-forming fluid welled up and precipitated, finally forming the Tongyu VHMS copper deposit.     

西藏曲水县达布斑岩铜(钼)矿床成岩成矿年代学研究

本文采用锆石LA-ICP-MS微区U-Pb测年技术,对冈底斯成矿带东段曲水县达布斑岩Cu(Mo)矿床北部达布矿区含矿斑岩体、南部显角囊含矿花岗闪长斑岩岩体进行了年代学研究,通过对3件岩体样品中单颗粒锆石的分析,达布主矿体花岗闪长斑岩样品206Pb/238U年龄加权平均值为16.5±0.05Ma(n=15,MSWD=3),达布主含矿体二长花岗斑岩样品年龄为16.1±0.13Ma(n=15,MSWD=1.03),南部显角囊矿体花岗闪长斑岩年龄为16.2±0.04Ma(n=13,MSWD=0.0064)。对达布矿床斑岩Cu(Mo)矿床主矿体中4件辉钼矿样品,显角囊矿体中6件辉钼矿样品,分别进行了Re-Os同位素测试,等时线年龄分别为14.6±0.50Ma(MSWD=0.35,主矿体)、14.8±0.23Ma(MSWD=1.3,显角囊)。结合前人研究以及本次测年结果认为:1)达布斑岩铜(钼)矿床岩体侵位的年龄应限定在16Ma左右,成矿时代为14Ma左右,成矿时间差小于0.86Ma,与区域上"成矿瞬时发生"的成矿规律是一致的;2)矿床产出于印度-亚洲大陆板块后碰撞伸展环境。     

南京直立人研究的新进展

简单地介绍了“南京直立人（猿人）综合研究专家组”近二年来的部份研究成果，如南京汤山葫芦洞内的地层可以分为4段；洞内的哺乳动物群可以分为时代不同的大洞动物群和小洞动物群；南京直立人的一号头骨与二号头骨层位不同，特征也不一；铀系测年也证明小洞的地层其年代在距今60万年-50万年间，大洞的地层年代在距今24万年-10万年间，大洞被堆石堆砾石层封闭的时间应在13万年-10万年间。从而补充和纠正了前人研究中的不足和错误。     

内蒙古阿巴嘎旗乌和尔楚鲁图钼矿区成矿斑岩的岩石地球化学特征与年代学

乌和尔楚鲁图钼矿床位于国内重要的二连东乌旗钼矿成矿带中,为近几年新发现的斑岩型钼矿床.本次就该矿床成矿岩体的地球化学及其U-Pb年代学开展相关研究.结果表明: 矿区中的成矿岩体属过铝质、高钾钙碱性系列;富集大离子亲石元素(LILE)、亏损高场强元素(HFSE),具有与南岭型花岗岩相似的地球化学特征.锆石LA-ICP-MS U-Pb定年显示,与乌和尔楚鲁图钼矿床成矿有关的花岗斑岩形成于中侏罗世((160 ± 1)Ma).因此,可推测乌和尔楚鲁图钼矿床斑岩型钼矿的成矿时代为燕山早期.综合研究认为乌和尔楚鲁图斑岩型钼矿床形成于后碰撞的构造环境.     

内蒙武川后石花金矿床辉钼矿Re-Os同位素年龄及其地质意义

后石花金矿是华北克拉通北缘一小型石英脉型金矿床。对矿体5件辉钼矿样品的ReOs同位素分析,获得了介于280.3±3.8~283.0±3.9Ma,加权平均为282.0±1.8Ma(MSWD=0.28)的同位素模式年龄,以及一个相关性很好的等时线年龄281.9±1.8Ma(MSWD=0.57),表明矿床形成于早二叠世,推测是海西晚期古亚洲洋俯冲体制下陆缘弧背景中构造-热液成矿事件产物。综合区域资料认为,华北北缘中段在海西晚期曾发生过重要成矿作用,但多在后期被剥蚀破坏。华北北缘中段大陆弧范围内,叠加在前寒武纪结晶基底韧性剪切带之上的脆性断裂构造带,以及华北北缘早古生代增生带内部,是形成海西晚期金、钼矿床的有利部位。     

西藏当雄地区拉屋矿床磁黄铁矿Re-Os同位素测年 和成矿物质来源示踪

拉屋矿床位于西藏自治区当雄县境内,大地构造位置处于冈底斯成矿区申扎-旁多铜、银、铅、锌、金成矿带,为大型矽卡岩型铜铅多金属矿床。在系统研究拉屋矿床地质地球化学特征的基础上,以矿石的磁黄铁矿为对象,测定Re-Os同位素年龄,获得等时线年龄数据为(309±31)Ma,187Os/188Os的初始值为0.51±0.12,γOs值为306.90~880.29,Re/Os为20.46~80.46。上述结果,结合矿区野外地质特征和稳定同位素特征,证明拉屋矿床主要形成于晚石炭世来故期,其成矿物质来源于地幔,并在喷流过程中与地壳海底卤水汇合,遭受了壳源物质的混染,形成喷流成因矽卡岩型矿床。