中南祁连西缘肃北三个洼塘地区古生代两类花岗质侵入岩年代学及其地质意义

中南祁连西缘三个洼塘附近花岗质岩石由花岗岩、石英闪长岩和花岗闪长岩构成。LA-ICP-MS锆石U-Pb年龄测定结果表明,花岗岩、石英闪长岩和花岗闪长岩侵位年龄分别为416.7±4.3Ma(MSWD=0.52)、442.5±4.7Ma(MSWD=0.46)和443.9±1.3Ma(MSWD=0.17),指示本区发生了两期岩浆活动事件。花岗质岩石均表现为过铝质,花岗岩高钾、K/Na,低Mg、Fe、Ca的主量元素特征,富集高场强元素,亏损大离子亲石元素,∑REE为122.0×10-6,δEu为0.05,具明显负铕异常。花岗闪长岩和石英闪长岩多数富钠,高场强元素含量相对花岗岩较低,而大离子亲石元素含量相对花岗岩略高,∑REE为133.3×10-6~247.6×10-6,δEu为0.73~1.09,铕异常特征不明显。综合研究表明,本区花岗岩可能属于造山活动结束后伸展环境下地壳物质部分熔融形成的A型花岗岩,花岗闪长岩和石英闪长岩则可能属于洋壳俯冲环境下引起岛弧岩浆活动而形成的I型花岗岩,这一成果对于研究中南祁连的构造演化有着重要意义。     

西秦岭东段印支期花岗质岩浆作用及构造演化：地球化学、锆石U-Pb年代学及Hf同位素约束

西秦岭造山带东段发育大量印支期花岗岩,由北向南贯通整个西秦岭造山带。本文选取西秦岭东段的柴家庄、太白、周家山和迷坝4个花岗质岩体进行岩石学、地球化学、锆石U-Pb定年和Lu-Hf同位素研究。这些花岗质岩体的岩性主体为石英闪长岩-花岗闪长岩-二长花岗岩,属高钾钙碱性系列,形成时代在237～219Ma之间,并显示出两期岩浆活动的特点,早期柴家庄岩体形成于236.6±2.9Ma,晚期的太白、周家山和迷坝岩体形成于220.12～218.9Ma。早期柴家庄二长花岗岩显示出类似埃达克岩的一些地球化学特点,如高含量的Sr(578 × 10~(-6)～661 × 10~(-6))和高的(La/Yb)_N比值(37.44～41.73),低含量的Y(3.48 × 10~(-6)-5.50 × 10~(-6))和Yb(0.3 × 10~(-6)～0.5 × 10~(-6)),以及弱的负Eu异常(δEu=0.85～1);在晚期花岗岩中,迷坝和周家山岩体同样表现高Sr含量(Sr400 × 10~(-6))、低Yb含量(Yb 2 × 10~(-6))的特点,但太白花岗岩则类似于喜马拉雅型花岗岩(Sr 400 ×10-6,Yb 2 ×10~(-6))。锆石Hf同位素组成显示,柴家庄、太白、周家山和迷坝岩体的ε_(Hf)(t)值分别为-5.1～2.2、-4.8～-0.9、-6.0～-2.7和-6.3～-3.9,对应的二阶段模式年龄(t_(DM2))依次为2153～1495Ma、2120～1767Ma、2227～1932Ma、2249～2033Ma,表明西秦岭东段花岗质岩体的源区主要为古元古代-中元古代壳源物质,柴家庄岩体可能有部分新生下地壳物质加入,并且整体表现出结晶基底组成由北向南逐渐变老的趋势。显示埃达克岩特点的花岗岩可能形成于加厚下地壳的部分熔融,而其喜马拉雅型的花岗岩则是正常下地壳部分熔融的产物。三叠纪时期发生的陆陆碰撞导致地壳加厚,加厚下地壳在不同深度发生的部分熔融,形成本区具有埃达克或者喜马拉雅型地球化学特点的花岗质岩体。     

北阿尔金地区早古生代洋壳俯冲时限:来自斜长花岗岩和花岗闪长岩的证据

蛇绿岩在不同演化阶段自身形成的花岗质岩石和侵入到蛇绿岩中的花岗质岩石对于蛇绿岩的精确定年具有重要意义,是揭示洋壳俯冲时限的有力证据。对北阿尔金红柳沟—拉配泉蛇绿岩中斜长花岗岩和花岗闪长岩的锆石U-Pb及Lu-Hf同位素分析表明,红柳沟斜长花岗岩和花岗闪长岩的锆石LA-ICP-MS U-Pb定年结果分别为(501±3)Ma和(496±2)Ma,表明北阿尔金洋的俯冲时限可能开始于中寒武世或更早。斜长花岗岩和花岗闪长岩的锆石εHf(t)值均为正值,结果分别为1.6~5.6和3.3~6.9,反映其源区均为亏损型地幔。全岩地球化学分析结果表明,斜长花岗岩具有高Si O2、高Sr、低Y和相应的高Sr/Y等类似于埃达克质岩石的特征,可能来自热的洋壳俯冲到石榴角闪岩相条件下变基性岩发生小比例部分熔融形成,且其形成深度应该在40~50 km;花岗闪长岩属于高钾钙碱性系列岩石,可能代表了岛弧环境下下地壳基性岩石部分熔融的产物。年代学分析表明,北阿尔金洋可能存在南北双向俯冲,并且北阿尔金洋向北俯冲可能略早于向南俯冲。北阿尔金和北祁连的俯冲时限对比研究表明,北阿尔金早古生代缝合带是北祁连早古生代缝合带的西延部分。     

太行山北段王安镇杂岩体岩石学、年代学、地球化学特征及地质意义

王安镇杂岩体主要由花岗闪长岩、二长花岗岩、花岗岩、石英闪长岩、二长闪长岩组成,LA-ICP-MS锆石U-Pb测年显示,花岗闪长岩和石英闪长岩分别形成于129±2.7Ma和128.3±1.9Ma,说明该杂岩体形成于早白垩世。王安镇杂岩体具有高Sr/Y比值(3.63~83.5),和高Sr(373×10-6~821×10-6),及低Y(7.36×10-6~22.21×10-6)、Yb(0.95×10-6~1.27×10-6)含量的地球化学特征,这与埃达克岩相似。该杂岩体具有相对低的87Sr/86Sr初始比值(0.706538~0.709484)和明显偏低的εNd(128Ma)值(-18.4~-12.8)。结合太行山中生代中-基性侵入岩中地幔包体已有的研究成果,认为具有高Sr/Y特征的王安镇杂岩体是在下地壳发生大规模拆沉的基础上,随着软流圈上涌其所携带的热促使加厚基性下地壳发生部分熔融,之后熔融岩浆在上升的过程中发生了角闪石的结晶分异和岩浆混合作用形成。     

广西大瑶山隆起罗平花岗岩的地质地球化学特征及其意义

广西大瑶山隆起罗平花岗岩的主体岩性为花岗闪长斑岩、斑状花岗闪长岩、花岗闪长岩和石英二长斑岩。三件花岗闪长斑岩的LA-ICP-MS锆石U-Pb定年结果分别为(442.8±5.8)Ma、(443.4±4.8)Ma和(442.9±5.3)Ma,为加里东期侵入体。罗平花岗岩具有高硅钠低铁镁的主量元素特征,为准铝质到弱过铝质的钙碱性系列岩石(σ43:0.89~2.09)。具有右倾型的稀土配分曲线,总稀土含量为6 8.11×10~(-6)~199.45×10~(-6),中等的负铕异常(δEu:0.59~0.85)。原始地幔标准化蛛网图中,相对富集Rb、Th、U等元素,相对亏损Ba、Nb、Ta、P和Ti等元素。岩石地球化学特征表明罗平花岗岩为I型花岗岩。罗平花岗岩的ε_(Sr)(t)为32.65~93.55、ε_(Nd)(t)为-6~-0.036,亏损地幔模式年龄(T_(2DM))为(1.17~1.67)Ga,Sr、Nd同位素表明罗平花岗岩来自于中元古代地壳物质的部分熔融。构造环境判别图解显示罗平花岗岩形成于碰撞构造环境,可能与加里东期南侧云开古陆的北向碰撞有关。     

北淮阳沙坪沟钼矿床成矿斑岩体特征与成因

沙坪沟钼矿床位于大别山北麓的北淮阳构造带,是近年来新发现的特大型斑岩钼矿床。区内燕山期岩浆岩广布,岩性有二长花岗岩、花岗闪长岩、闪长岩、石英正长岩、花岗斑岩、正长花岗岩、隐爆角砾岩等,钼矿床与最晚期的石英正长岩-花岗斑岩成因有关。对最晚期的花岗斑岩体系进行了LA-ICPMS锆石U-Pb定年,结合前人已发表的年代学数据,将区内岩浆岩划分为3个阶段:第一阶段141~133 Ma,主要发育二长花岗岩,具有高Sr、低Y的地球化学特征,形成于加厚下地壳的部分熔融;第二阶段132~125 Ma,包括中基性的含斜长石辉石岩、斜长角闪石岩、闪长岩和酸性的花岗岩、花岗闪长岩等,中基性岩的出现表明地幔物质参与了该阶段岩浆岩的形成,可能与加厚地壳拆沉、软流圈物质上涌有关;第三阶段120~110 Ma,主要发育石英正长(斑)岩和花岗斑岩,为壳源成因。第一阶段岩浆岩的ε_(Hf)(t)介于-28.3~-22.5,与大别造山带大范围分布的中生代岩浆岩一致,结合前人研究分析表明,沙坪沟第一阶段岩浆岩为类似南秦岭陡岭群片麻岩源区构成的加厚下地壳部分熔融的产物。相比第一阶段岩浆岩,第三阶段石英正长岩、正长花岗岩脉、隐爆角砾岩和花岗斑岩的ε_(Hf)(t)非常一致,介于-18.4~-13.3之间,与北淮阳千鹅冲钼矿成矿花岗斑岩及汤家坪钼矿成矿花岗斑岩一致,其ε_(Hf)(t)明显偏高,应为较浅岩浆源区熔融的结果。华南板块广泛分布的古生代富Mo黑色页岩具有和北淮阳成钼矿岩浆岩具有一致的模式年龄,是形成北淮阳钼矿岩浆岩的理想层位。     

甘肃北山南带沙枣园复式岩体年代学、地球化学特征及其构造意义

北山南带沙枣园复式岩体由中细粒黑云母花岗闪长岩、细粒黑云母石英闪长岩、中粒黑云母二长花岗岩和中粗粒黑云母正长花岗岩4个岩相单元组成。LA-ICP-MS锆石U-Pb定年结果表明,中细粒黑云母花岗闪长岩、细粒黑云母石英闪长岩和中粒黑云母二长花岗岩侵位于晚二叠世(252.1±1.9Ma、252.2±2.1Ma和248.8±3.5Ma),为海西晚期的产物;而中粗粒黑云母正长花岗岩侵位于早三叠世(246.4±2.0Ma),为印支早期的产物。该花岗质岩石均具有稀土元素的球粒陨石标准化配分曲线呈右倾型,轻重稀土分馏大,轻稀土富集且分异明显,而重稀土亏损且分异不显著特征。中细粒黑云母花岗闪长岩和细粒黑云母石英闪长岩具有较高的SiO_2、Al_2O_3和Na_2O含量,以及较低的MgO含量,强烈富集Sr而亏损Yb和Y,具轻微的铕异常(δEu=0.75～1.16),表现出典型的埃达克岩特征;中粒黑云母二长花岗岩和中粗粒黑云母正长花岗岩总体富硅(SiO_2)、富钾(K_2O)、富碱(K_2O+Na_2O),Al_2O_3含量中等,铕分别呈现负异常(δEu=0.45～0.73)和强负异常(δEu=0.02～0.08)。年代学及地球化学特征研究表明:①中细粒黑云母花岗闪长岩和细粒黑云母石英闪长岩属准铝质-弱过铝质的钙碱性Ⅰ型花岗岩,并具有典型的埃达克岩特征,中粒黑云母二长花岗岩属弱过铝质的高钾钙碱性Ⅰ型花岗岩,中粗粒黑云母正长花岗岩属弱过铝质的高钾钙碱性A2型花岗岩;②中细粒黑云母花岗闪长岩、细粒黑云母石英闪长岩和中粒黑云母二长花岗岩的岩浆来源于下地壳玄武质岩石部分熔融源区,并在上升过程中混染了下地壳物质,而中粗粒黑云母正长花岗岩的岩浆来源于年轻地壳中富含黑云母的变质泥岩部分熔融源区;③中细粒黑云母花岗闪长岩、细粒黑云母石英闪长岩和中粒黑云母二长花岗岩是俯冲-碰撞构造背景条件下的岩浆产物,而中粗粒黑云母正长花岗岩是同碰撞-碰撞后构造背景条件下的岩浆产物。     

北祁连东段冷龙岭地区毛藏寺岩体和黄羊河岩体的岩石成因及其构造意义

文中研究了北祁连东段冷龙岭地区毛藏寺岩体和黄羊河岩体的年代学、地球化学和Sr-Nd同位素组成。毛藏寺岩体主要岩石类型为花岗闪长岩。锆石U Pb定年获得花岗闪长岩岩浆结晶年龄为（424±4） Ma。花岗闪长岩具有高的Mg#（约55）,K2O/Na2O=0.77~0.91,A/CNK=0.92~0.94,表明岩石属准铝质。在微量元素组成上,花岗闪长岩富集LILE、亏损HFSE,轻重稀土分异明显［(La/Yb)N=16.9~19.5］,具有弱的Eu负异常（Eu/Eu*=0.75~0.83）;花岗闪长岩具有ISr=0.706 3~0.706 5,εNd(t) =-1.5~-1.1,TDM=1.10~1.16 Ga。这些地球化学特征和Sr Nd同位素组成表明,花岗闪长岩岩浆源区为基性下地壳变玄武质岩石,但在成岩过程中有少量幔源物质的加入。黄羊河岩体主要由钾长花岗岩组成,其岩浆结晶年龄为（402±4） Ma。岩石富碱（K2O+Na2O=6.91‰~7.66%）,K2O/Na2O>1,A/CNK=0.97~1.05。钾长花岗岩富集LILE及HFSE,轻重稀土元素分馏中等［(La/Yb)N =10.6~17.8］,并具有明显的负Eu异常（Eu/Eu*=0.43~0.68）,表明钾长花岗岩具有铝质A型花岗岩的地球化学特征。钾长花岗岩具有ISr=0.710 3~0.711 3,εNd(t)=-6.7~-6.0,TDM=1.46~1.55 Ga,反映岩浆主要来自地壳中长英质物质的部分熔融。冷龙岭地区花岗岩类的岩石成因及其岩浆演化揭示了北祁连山造山带从加里东早期的挤压构造体制向加里东晚期的伸展构造体制的演化。这些花岗岩类形成于碰撞后构造背景,岩浆的产生可能与俯冲的北祁连洋板片的断离作用有密切联系。     

南祁连拉脊山构造带早古生代岩浆混合作用:以马场岩体为例

拉脊山构造带位于南祁连构造带北缘,发育大量早古生代岩浆岩。其南缘马场岩体主要由黑云母花岗岩和花岗闪长岩组成,花岗闪长岩中发育大量的镁铁质微粒包体。黑云母花岗岩、花岗闪长岩和镁铁质包体LA-ICP-MS锆石U-Pb年龄分别为 467±7Ma、468±6Ma、466±6Ma。黑云母花岗岩具有低 K_2O/Na_2O(0.28～0.37)、高 Sr/Y(125～168)比值特征,为埃达克质岩;同时,黑云母花岗岩还具有相对低的MgO、Cr、Ni含量和Mg~#值,富集轻稀土、大离子亲石元素(Ba、K、Pb、Sr)以及Zr、Hf,亏损重稀土和高场强元素(Nb、Ta、Ti),具有Eu正异常(Eu/Eu~*=1.30～1.58),亏损Sr-Nd和锆石Hf同位素组成((~(87) Sr/~(86)Sr)_t=0.7044～0.7046 ,ε_(Nd)(t)=+2.05～+2.21,ε_(Hf)(t)=+8.2～+10.2),指示黑云母花岗岩是新生地壳物质重熔的产物。镁铁质微粒包体与寄主花岗闪长岩之间呈过渡-截然接触界线,发育反向脉角闪石嵌晶结构、斜长石不平衡生长结构、镁铁质凝块以及刀刃状黑云母、针状磷灰石等显微结构反映典型的岩浆混合特征。镁铁质微粒包体与寄主花岗闪长岩均富集大离子亲石元素(Cs、K、Pb、Sr),亏损高场强元素(Nb、Ta、Zr、Hf),具有与黑云母花岗岩一致的Sr-Nd同位素组成,但镁铁质微粒包体具有更高的 MgO 含量(6.15%～9.12%)、Mg~#值(57～60)和 Cr(271 × 10~(-6)～424 × 10~(-6))、Ni(54.7 × 10~(-6)～86.6× 10~(-6))含量,暗示镁铁质微粒包体与花岗闪长岩是由受俯冲流体交代的地幔熔体与新生地壳物质重熔形成的熔体经岩浆混合而成。结合区域背景分析,本文认为马场岩体的形成与南祁连洋俯冲过程中幔源岩浆底侵加热新生地壳以及岩浆混合作用相关。     

北山地区园包山一带晚石炭世早期花岗岩地球化学特征及年代学研究

园包山晚古生代花岗岩位于内蒙古额济纳旗园包山一带,其岩体特征对红石山蛇绿岩带属性及北山北带的构造演化的重建具有重要意义。通过LA-ICP-MS锆石U-Pb同位素测年,确定园包山复式岩基中花岗闪长岩、二长花岗岩、奥长花岗岩的年龄分别为317.1±3.1、314.8±2.7和313.7±2.3 Ma,均属晚石炭世。岩石地球化学分析表明,园包山花岗岩高硅(SiO_2=67.77%～73.00%)、富钠(K_2O/Na_2O1),A/CNK=0.95～1.13,属偏铝到弱过铝质,富集大离子亲石元素(Rb、Ba、Th、K),亏损高场强元素(Ta、Nb、P、Ti),具有中等强度的负铕异常(δEu=0.46～0.65),呈现出岛弧环境的岩石地球化学特征。其中奥长花岗岩与花岗闪长岩、二长花岗岩又有所不同,岩石样品富硅,具非常弱的负铕异常(δEu=0.81～0.99),高Sr/Y和La/Yb,在Sr/Y-Y图上落入埃达克岩区域。上述特征差异暗示两者具有不同的源区。综合区域地质资料来看,晚石炭世早期研究区南侧红石山洋向北俯冲启动了这次大规模构造岩浆活动,形成了具岛弧性质的园包山花岗岩复式岩基,其中具埃达克质特征的奥长花岗岩来源于俯冲的洋板块的部分熔融,暗示红石山洋可能属较为年轻的热洋壳。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H₂O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H₂O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.     

Late Wuchiapingian (Late Dzhulfian,early Late Permian) limestone olistolites within the Tertiary flysch of Glypia Unit (Mount Parnon,central–eastern Peloponnesus,Greece)

Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931.     

PALEONTOLOGY

正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.)     

GEOCHEMICAL EXPLORATION

正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.)     

MICROPALAEONTOLOGY

正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.)     

PETROLOGY

正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus.,     

ENVIRONMENTAL GEOLOGY

正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an     

PROSPECTING EXPLORATION

正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of