充电法与激电法在四川里伍上海底铜矿区的应用效果

在地处四川西部高原山区的四川里伍铜矿外围上海底铜矿区处开展物探工作方法寻找铜矿.早期运用甚低频电磁法、高精度磁测、小极距激电中梯及充电法梯度观测工作,未达到找矿目的.这里根据工作场地的地形情况及地质情况,改变工作方法和技术手段,采用大功率直流激电中梯、激电测深及充电电位观测工作,获得了具有较好找矿意义的激电异常及充电电位异常,并在获得的异常处经验证已揭露出多个铜矿体,取得了较好的找矿效果.     

激电中梯测量在龙湾套铜矿找矿中的应用

泗水县龙湾套铜矿为岩浆熔离型铜镍硫化物矿床,通过激电中梯测量圈定了若干激电异常,经工程验证,不但在这些异常中发现了9个铜矿体,而且各矿体的形态,规模与异常的形态,规模大致吻合.     

激电法在巢湖市山里许矽卡岩型铜金矿靶区评价中的应用

为了在安徽省巢湖市山里许以西实现新的找矿突破,先后投入了双频激电扫面工作及大功率激电测深剖面工作.通过对取得的激电异常特征进行研究,推断了2处构造的分布;提取激电二次信息发现,激电电导率异常在研究区已知铜矿化部位有较好的反映,综合激电异常等特征,圈定了研究区以西2处成矿靶区;通过激电多参数与已知矿体综合分析,能有效地评...     

辽宁省北二十家子铜金矿地质特征与成矿预测

辽宁北二十家子铜金矿位于华北地台北缘的朝阳-赤峰金矿成矿带,区内多个蚀变岩型铜金矿(化)点受北西向、北东向断裂构造控制.土壤地球化学测量共圈定3类异常,其中Ⅰ类异常4处,Ⅱ类异常8处,Ⅲ类异常16处.在化探异常显示良好的区域进行了物探工作,其中物探高电阻率区域与化探Ⅰ类异常区重合,物探激电中梯和激电测深共圈定3个异常区...     

新疆玉勒肯哈腊苏铜矿床地质特征及找矿方向

玉勒肯哈腊苏斑岩铜矿床位于新疆卡拉先格尔斑岩铜矿带.矿床主要赋存于花岗闪长斑岩、二长花岗斑岩及中泥盆统北塔山组辉斑玄武岩等火山岩中.矿区韧性剪切变形强烈,岩体和矿体糜棱岩化发育.矿区发育多种蚀变,由矿化岩体向外总体具钾长石化-黑云母化-硅化、绢云母化-青磐岩化蚀变分带特征.矿化主要分布于钾长石化-黑云母化-硅化蚀变带中.矿体呈脉状、透镜状、不规则状.矿化呈浸染状、团块状、团斑状、细脉浸染状和细脉状.成矿元素以铜为主,伴生金、钼、银.化探、磁法、激电测量及频谱激电测深等对矿区勘查工作具较好指示作用.矿区处于1∶5万物探激电异常和Au,Cu,Ag,Mo,Cr,Ni,Co等元素组成的化探异常中.从矿体不同勘探线剖面及水平标高的矿体形态及变化趋势分析,矿区南东深部有见矿可能,推断矿区北部频谱激电测深异常及1∶5万激电异常部位有矿体、矿化体存在.     

新疆西准噶尔地区加尔塔斯斑岩型铜矿地质特征与深部预测

包古图大型斑岩型铜钼矿的发现显示了新疆西准噶尔地区斑岩型铜矿找矿的巨大潜力.加尔塔斯铜矿与包古图铜矿同处于达尔布特断裂南部,地层为下石炭系太勒古拉组一套火山碎屑岩;侵入岩以岩株、岩脉出露为特征,岩性以花岗闪长斑岩为主;蚀变类型主要有钾化、硅化-绢云母化、褐铁矿化、绿泥石化构成环带蚀变,目前共发现5处矿化点.大功率激电工作显示存在低阻、高极化异常带,异常与地表岩株、岩脉矿化部位吻合很好.激电测深表明在地下140～200m存在高极化、中低阻层,推断为含铜花岗闪长斑岩体.综合地质物探特征,初步认为加尔塔斯铜矿为斑岩型铜矿,深部找矿前景良好.     

激电法在浙江省高塘矿区铜多金属矿勘查中的应用

在浙江省江山市高塘矿区多金属矿勘查中,应用激电法验证在地形条件复杂,地表植被和残积层覆盖较厚地区探查隐伏矿层的可行性。根据地质任务,在矿区北东布置了4条测线,其中4线、5线采用对称四极激电测深,以发现矿体在垂向（断面）上引起的异常;6-1线、6线采用对称四极激电剖面测量,以了解矿体在平面上的异常范围。通过对ρs、ηs断面等值线图与平面等值线图的解释,圈定了Ⅰ、Ⅱ、Ⅲ号有价值成矿靶区,经后期钻孔验证,成功在Ⅱ号区域钻到四层充填于角砾间的团块状铜矿,证明运用激电方法找矿的可行性。     

化探在西藏雄村矿区Ⅱ、Ⅲ号矿体发现中的作用

雄村矿区是西藏冈底斯斑岩铜矿带内已查明资源(储量)及规模达大型的铜金矿区,最早发现Ⅰ号Cu-Au矿体,其后发现了Ⅱ、Ⅲ号Cu-Au矿体。化探异常在Ⅱ、Ⅲ号矿体的发现和初期勘查中起到了至关重要的作用,尤其是在发现和圈定Cu-Au矿找矿靶区中提供了重要线索。通过分析Ⅱ、Ⅲ号矿体勘查工作中的化探异常特点及作用,旨在为应用化探异常指导找矿工作提供参考作用,同时,对于冈底斯斑岩铜矿带其他地段寻找该类型矿床,具有十分重要的意义。     

西藏措勤县德能铜多金属矿床地质特征及找矿方向

德能铜多金属矿是在1/5万隆格尔-措麦地区矿调中发现的,有6条铜矿体,并伴生有铅、锌、金、银等多种有益组分.成矿地质条件较好,矿体主要赋存于岩体外接触带及构造破碎带中,其中Cu4矿体规模最大,经深部钻探工程及地表槽探验证,矿体品位和厚度沿走向和倾向变化系数较小,伴生组分较多,铜多金属矿床的成因类型为构造蚀变岩型,其形成与岩浆活动关系密切,空间分布严格受岩浆岩和断裂的控制.矿区激电异常和化探异常显示矿区是寻找铜、铅、锌多金属矿的有利部位,找矿前景良好.     

内蒙古克什克腾旗黄岗山锡铜矿激电测量方法应用分析

内蒙古克什克腾旗黄岗山锡铜矿区北部及中部为第四纪冰川遗迹,在植被极其发育的地表之下为冰渍物、残坡积物等组成的碎石层,厚度多大于3m,因此开展地表地质工作有一定的难度。为提高找矿效果,开展了1：1万激电测量工作。通过对激电异常的查证分析,在DJH-1号激电异常南西侧边界,燕山早期似斑状中细粒黑云母二长花岗岩与两侧石英闪长岩、花岗斑岩的内、外接触带附近发现有多期次岩浆侵入,矿化蚀变强烈,目前共圈定锡矿体10个、铜矿体8个;圈定的矿体和发现的激电异常具有较好的对应性,为进一步开展地质勘查工作提供了重要的依据。     

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