基于区域重磁信息的湖南怀化地区金属成矿预测

根据湖南怀化地区1∶20万区域重力资料和1∶5万航磁资料,研究了怀化地区深部断裂及岩浆岩特征,圈定了隐伏-半隐伏岩体和断裂构造,并根据地质矿产和物化探综合信息,分析了成矿区带与岩体和构造的关系,总结了成矿区带的区域重磁场特征,圈出5个成矿远景区,为怀化地区寻找深部矿和隐伏矿提供了重要信息。     

河南光山县千鹅冲铜钼多金属矿床地质特征及成因浅析

河南光山县千鹅冲铜钼多金属矿床是新发生的一个隐伏矿床。通过对区域地质背景矿区地质特征以及矿床特征等分析与研究,认为铜钼矿床为深部隐伏岩钟斑岩体。外接触带铜钼多金属矿床。矿体主要赋存于隐伏岩体顶上带中,矿床规模与隐伏（斑）岩体或隐伏（斑）岩体上方岩钟（成矿母岩）、隐伏岩体顶上带（赋矿围岩）及区域性断裂构造等密切相关。该矿床的发现对该成矿区带找矿隐伏有现实指导意义。     

高精度磁法测量在内蒙古克力代金矿点查证中的应用

运用1∶ 1 万高精度磁测方法,对1∶ 5 万矿产调查工作中发现的地球化学异常及克力代金矿点深部隐伏控矿构造及矿化蚀变进行评价。结果表明,高精度磁测不仅可以圈定隐伏的控矿构造,确定有利成矿区带,而且可以进一步圈定隐伏的强、弱磁性矿体。对克力代金矿点矿化蚀变带的1∶ 1 万高精度磁法测量数据解译表明,该矿化蚀变区内,由4 条深部隐伏断裂围限,形成了强磁性背景场下的局部低负异常区带,说明深部隐伏断裂构造及矿化蚀变等造成的降磁作用较强,暗示深部具有较大的成矿潜力。     

高精度重力测量在雪山嶂地区地质综合调查中的应用

主要介绍了1∶5万高精度重力测量在广东南岭雪山嶂地区地质综合调查中的应用。利用面积性及剖面性重力数据处理和解释所取得的成果,在指导1∶5万地质填图中圈定半隐伏或隐伏岩体、追踪断裂构造、确定地层界线及追索矿(化)体等发挥了重要作用。以成矿地质体、成矿构造和成矿结构面、成矿作用"三位一体"成矿理论指导大宝山矿床外围找矿,圈定了大宝山矿集区含矿建造范围,追踪已知矿段延伸,分析其深部成矿潜力。根据1∶5万重力测量成果,在大宝山矿床外围的北东侧剩余重力正异常部位,成功发现深部厚大铜矿。     

山东省金矿成矿区带划分及找矿方向探讨

依据山东省金矿的空间分布规律、控矿构造、控矿地质体、矿床类型将其划分为三山岛-仓上成矿带、龙莱成矿带、招平成矿带、牟乳成矿带、栖蓬福成矿区、胶莱盆地周缘成矿区和鲁中南中生代杂岩体分布区成矿区等7个成矿区带.金矿成矿区带一般分布于大地构造单元的边部或不同大地构造单元的结合部位,金矿床则主要受断裂构造和不同地质体的接触带控制.山东省金矿资源潜力很大,已有成矿带的深部及周边隐伏矿体是今后的找矿重点.     

衡山构造蚀变岩型金矿特征及其找矿方向

衡山南岳岩体北侧,地质构造复杂,岩浆活动频繁,金矿成矿地质条件有利,已发现一个具有远景的金矿带,其中石子坳矿区为构造蚀变岩型金矿。本文简要地介绍了区域和矿区地质特征,总结出花岗闪长斑岩,硅化带和As元素化探异常等3条找矿标志,建议在该区开展大比例尺化探测量和地质填图,普查北西向硅化断裂破碎带,并对石子坳含金破碎带进行深部验证,寻找隐伏金矿床。     

湘南区域重磁异常的地质解释及其在成矿预测中的应用

根据对区域重磁异常的分析,蓝山—酃县重力梯度带可作为湘南二级大地构造单元的分界线。在各地质单元中,深大断裂以及隐伏岩体等,都有明显的区域重磁异常特征。因此,利用区域重磁资料研究湘南地质和找矿问题是有意义的。文中提出的区域重磁异常在湘南成矿预测中的应用有如下五个方面: 1.重力资料所反映的区域性深断裂具有重要的控矿作用,尤其是与表生构造的交汇部位最易形成大矿。 2.航磁资料反映的高磁区有明显的控矿作用。 3.重力负异常反映的隐伏岩体,对于开展深部找矿具有指导作用。 4.短轴串珠状航磁异常反映的矿化、蚀变、断裂破碎带,对于从地表众多的断裂构造中区分出具有控矿作用的断裂带是有意义的。 5.在成矿地质环境有利地区的局部磁异常,对于查明具体矿床有重要意义。     

蒙山南部浒溪硅灰石矿床地质特征及控矿因素

浒溪硅灰石矿床位于江西蒙山南部,紧邻石竹山硅灰石矿南东角。本文以浒溪矿区野外钻探成果为第一手资料,以周边矿区资料为辅,总结了浒溪硅灰石矿床地质特征,分析了浒溪硅灰石矿控矿因素。研究表明:浒溪矿区硅灰石矿主要为接触热变质型矿床,硅灰石成矿物质来源为中二叠统茅口组含燧石结核灰岩;硅灰石成矿热量来源为印支期的蒙山岩体;区域的滑覆构造体系形成的各种次级裂隙能使CO_2逸出,有利于成矿;蒙山南部第四系覆盖区域深部仍具有较大的隐伏硅灰石矿找矿前景。     

综合物探在新疆1∶50000矿产普查中的应用

为了在新疆1∶50000矿产普查中研究成矿地质条件圈定成矿远景区域,在普查过程中通过重、磁、电等多种物探手段的综合应用,来探测深部和隐伏矿,效果明显。通过采集标本对其工作区的物性特征加以归纳分析,指导物探方法(重、磁、激电)的运用,为后续开展物探工作提供借鉴。首先在工作区利用重力和航磁资料,查明勘探区内地质构造特征及岩体分布规律,得到重、磁高值异常区多与岩体、岩体接触带及断裂带有关,而该区域的成矿与接触带或断裂构造密切相关,在接触带及断裂构造带上有利于硫化物发育,再利用大功率激发极化法的低阻高极化特征圈定含硫化物的有利区域,最后优选重、磁、电综合物探异常特征明显、成矿部位有利地段,并结合地质、化探异常特征对工作区定性的综合评价,指导寻找含硫化物的岩(矿)体,最终圈定找矿靶区一处,为矿产普查工作提供基础资料和找矿依据。     

福建漳平高山垄矿区铁多金属矿成矿地质特征及找矿前景

通过对区域成矿地质背景的分析,结合矿区的地质条件和土壤测量异常特征,并根据已查明的铁多金属矿体的控矿因素、矿化特征和围岩蚀变分析,认为该矿区深部隐伏有一个较大的花岗岩岩体,溪口组地层为矿源层,矿床成因具有多样性,找矿前景良好。深部岩体与围岩的内外接触带中赋存的矽卡岩型断裂蚀变带中的热液型铁多金属矿,通过加强勘查与综合研究力度,可获得找矿上的较大突破。     

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