藏南隆子—措美一带构造特征浅析

藏南隆子—措美一带夹持于藏南拆离系(STDS)和雅鲁藏布江缝合带(IYS)之间。印度与欧亚大陆的碰撞作用形成了该地区特殊的构造样式,由近东西向展布的藏南拆离系主拆离带和洛扎、绒布—隆子两条断裂带、一系列倒转复式褶皱以及两个穹窿构造组成。始喜马拉雅期印度板块与欧亚大陆发生大规模陆—陆碰撞,导致特提斯喜马拉雅前陆盆地发生大规模缩短,沉积盖层以藏南拆离系为底界自北向南大规模逆冲推覆、褶皱;新喜马拉雅期高喜马拉雅结晶岩系自北向南挤出;藏南拆离系主拆离带和洛扎、哲古两条次级构造带上盘地层是自南向北伸展的产物。     

藏南锑-金矿带成矿规律初步探讨

1概况本成矿带主要指介于雅鲁藏布江缝合带(IYS)与藏南拆离系主拆离面(STDS)之间的特提斯喜马拉雅的部分,西起噶尔经定日东至隆子,总体呈EW向展布,长约2000km,东宽西窄,北邻冈底斯岩浆成矿带,南为高喜马拉雅地体,隶属于特提斯成矿域—喜马拉雅成矿省—喜马拉雅AuSbFe白云母成矿带—北喜马拉雅(大陆边缘)AuSb白云母成矿亚带,为青藏高原最具特色和最重要的锑-金成矿区带。该矿带已发现锑     

西藏拉琼锑金矿床流体包裹体特征及地质意义

正拉琼锑金矿床位于措美县西约17 km,大地构造位于青藏高原南部的特提斯喜马拉雅构造带东段,地处于印度河—雅鲁藏布江缝合带(IYZS)与藏南拆离系(STDS)大断裂之间。由于印度板块与欧亚板块碰撞之后,导致印度洋持续扩张,造成印度大陆不断向北挤压,形成喜马拉雅造山带(尹安,2000),该地区近东西向的断裂自北而南依次     

藏南马扎拉金锑矿床成矿潜力分析

马扎拉金锑矿位于西藏自治区山南地区措美县东南部古堆乡,东临隆子县,南近错那县,区域上位于藏南拆离断裂（陈智梁等,1996）以北的特提斯喜马拉雅（或称特提斯喜马拉雅）褶皱造山带（许志琴等,2006）南部,属于隆子逆冲推覆断裂的前缘。自印度-亚洲大陆汇聚以来,经历了复杂的构造-岩浆活动,矿区具有十分有利的成矿条件,具有中型以上矿床的找矿前景。自2014年开始,成都地质调查中心在矿区开展地质找矿工作,到目前为止已新发现多条矿（化）体。     

青藏高原南部与东南部重要成矿带的大地构造定格与找矿前景

印度/亚洲汇聚-碰撞过程经历了新特提斯洋盆滋生、消减和俯冲、亚洲南缘增生造山以及印度/亚洲碰撞造山和青藏高原的隆升,在青藏高原南部和东南部造就了"冈底斯火山岩浆带"、"雅鲁藏布江缝合带"、"喜马拉雅碰撞造山带"和大量物质向南东逃逸的"三江侧向挤出地体群",以及相应形成具有重大找矿突破战略前景的"冈底斯成矿带"、"雅鲁藏布江成矿带"、"特提斯喜马拉雅成矿带"和"三江成矿带"。本文通过对四大成矿带的大地构造定格讨论了与资源前景相关的科学问题,提出"冈底斯成矿带"中的岛弧型斑岩铜金矿具有找矿的重大潜力、重视藏东—滇西地区的俯冲-碰撞型岩浆成矿专属性研究;提出扩大西藏罗布莎铬铁矿矿集区的开发规模,以及在西部阿里地区的大型超基性岩体中寻找新的铬铁矿远景地的思路;在三江多阶段成矿作用的叠合型矿床中,集中古特提斯和新特提斯成矿类型,关注与斜向碰撞有关的走滑剪切带对成矿作用的制约机制;需进一步确定特提斯喜马拉雅矿化带与藏南拆离系关系和重视始—中新世高Sr/Y花岗(斑)岩的成矿专属性及找矿前景。     

藏南金锑成矿带成矿规律研究及找矿取得重大进展

研究区位于北喜马拉雅地区 ,广泛发育石炭纪—早二叠世地台型沉积建造、中生代陆隆 -陆坡及深海断陷盆地建造 .受两大板块俯冲、碰撞作用的影响 ,在藏南地区形成了一系列在不同层次构造层发育的拆离断层、与伸展背景有关的近南北向的新生代盆地和强烈的地下热液活动与深层拆离作用有关的变质核杂岩 .1 999— 2 0 0 2年通过开展《西藏措美县马扎拉金锑矿控矿因素与成矿规律研究》和《西藏江孜—隆子金锑成矿带资源潜力调查评价》项目 ,笔者对藏南金锑成矿带进行了系统深入的研究 ,在认识上有重大突破 ,对藏南控矿因素及成矿规律提出了创新的…     

盐源—丽江构造带是新生代陆内造山带

盐源-丽江构造带处于扬子大陆与青藏特提斯的结合部,其造山时代的确定,不仅对正确认识该区的构造性质与发展历史及指导矿产勘查有重要意义,而且有助于判定印度-欧亚板块碰撞事件对欧亚板块内部影响的广度和深度。通过系列构造-成矿测年,结合地层、构造、岩浆活动、成矿作用的综合研究,证实盐源-丽江构造带是新生代陆内造山带,而不是印支造山带。其造山作用主要发生于中-晚始新世之交的喜马拉雅期,与欧亚-印度板块碰撞触发的扬子大陆岩石圈向青藏特提斯岩石圈俯冲有关,表现为地壳多层次拆离、剪切和沉积盖层的滑脱、褶皱和推覆,属陆内造山,系印度-欧亚板块碰撞事件的一种远程效应。     

北喜马拉雅成矿带地质背景与主攻矿床类型思考

<正>藏南大地构造地质单元以藏南拆离系(STDS)、主中央逆冲断层(MCT)和主边界逆冲断层(MBT)为界,可将其由北向南划分为特提斯喜马拉雅(THB)、高喜马拉雅(HHB)、低喜马拉雅(LHB)和亚喜马拉雅构造带(尹安,2001)。特提斯喜马拉雅(THB)因近年来对金、银、锑、铅、锌等矿种找矿效果明显,且钨、锡     

藏南拉木由塔锑(金)矿床地质特征及成因探讨

<正>拉木由塔锑(金)矿床隶属西藏自治区错那县区卓木乡,位于错那县北65 km处,特提斯喜马拉雅地块中东部康马-隆子褶冲带库曲-卡达褶断束。本文拟在区域地质、矿床地质研究的基础上,结合矿床的C、H、O、S、Pb等同位素及流体包裹体的研究,对矿床的成因和成矿过程进行探讨。1成矿地质背景研究区位于北喜马拉雅板片洛扎生长断裂的北侧。北喜马拉雅(特提斯喜马拉雅)呈东西     

西藏北喜马拉雅成矿带锑金属成矿作用及找矿方向

北喜马拉雅成矿带是全球巨型成矿带——特提斯—喜马拉雅成矿域的重要组成部分,发育一系列锑、锑金、锑多金属、金、铅锌银、钨锡(铍)、汞、铯为主的矿床或矿(化)点,是全球地质学家关注的热点区域。北喜马拉雅成矿带锑成矿作用时间集中在24~16 Ma之间,与后碰撞造山成矿事件(N₁: 25~9 Ma)时间一致,锑来源于深部岩浆减压分熔形成的富含挥发分的次火山岩浆活动,形成喷流沉积-改造型、岩浆热液型、热泉型矿床系列。因此,矿区内的幔源基性-中性脉岩是锑成矿的重要控制因素,也是找矿的重要标志。Sb元素异常主要围绕羊卓雍错裂谷盆地边缘分布,部分与Au元素异常重合。Sb异常主要与低温热液矿床相关,可单独成矿,亦可与Au共生。当Sb异常与Pb-Zn-Ag异常组合在一起时,多为后期叠加改造成矿,并伴生Ga、Se、In等。锑或锑多金属矿体走向多为近SN向,形成串珠状的地球化学异常组合及矿化组合,主要受走滑正断系统及其次级构造控制,并且在矿带的东部,矿化由北向南具有Sb矿→Au-Sb矿→Au矿→Sb-Pb-Zn-Ag矿→W-Sn矿的规律性分布,揭示成矿中心应在扎西康矿床的深部或南部。锑金矿体走向多为近EW向,主要受拆离构造及其次级构造控制。北喜马拉雅被动大陆边缘中生代裂谷(陷)盆地周围盆山转换部位,特别是同沉积断裂带与新生代SN向堑式构造的交汇部位,是寻找锑、锑金、锑多金属矿床的最有利地区,已发现特提斯—喜马拉雅成矿域中规模第一的扎西康锑多金属矿床等一系列大-超大型矿床,显示巨大的找矿前景。综上所述,北喜马拉雅成矿带将会成为我国最重要的锑资源勘查开发后备基地之一。     

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.     

Inter-regional correlation of transgressions and regressions in the Cretaceous period

Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous.     

The lamprophyres of Afyon stratovolcano,western Anatolia,Turkey: description and genesis

The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism.     

METAMORPHIC PETROLOGY

正20140751 Guo Xincheng(Geological Party,BGMRED of Xinjiang,Changji 831100,China);Zheng Yuzhuang Determination and Geological Significance of the Mesoarchean Craton in Western Kunlun Mountains,Xinjiang,China(Geological Review,ISSN0371-5736,CN11-1952/P,59(3),2013,p.401-412,8     

GEOCHEMICAL EXPLORATION

正20141058 Chen Ling(Key Laboratory of Mathematical Geology of Sichuan Province,Chengdu University of Technology,Chengdu610059,China);Guo Ke Study of Geochemical Ore-Forming Anomaly Identification Based on the Theory of Blind Source Separation(Geosci-     

SEISMIC GEOLOGY

正20141334 Chen Kun(Institute of Geophysics,China Earthquake Administration,Beijing100081,China);Yu Yanxiang Shakemap of Peak Ground Acceleration with Bias Correction for the Lushan,Sichuan Earthquake on April20,2013(Seismology and Geology,ISSN0253-4967,CN11-2192/P,35(3),2013,p.627-633,2 illus.,1 table,9 refs.)Key words:great earthquakes,Sichuan Province     

HISTORICAL GEOLOGY & STRATIGRAPHY

正20141624 Cai Xiongfei(Key Laboratory of Geobiology and Environmental Geology,Ministry of Education,China University of Geosciences,Wuhan 430074,China);Yang Jie A Restudy of the Upper Sinian Zhengmuguan and Tuerkeng Formations in the Helan Mountains(Journal of Stratigraphy,ISSN0253-4959CN32-1187/P,37(3),2013,p.377-386,5 illus.,2 tables,10 refs.)     

PALEONTOLOGY

正20142263Lü Shaojun(Geological Survey of Jiangxi Province,Nanchang 330030,China)Early-Middle Permian Biostratigraphical Characteristics in Qiangduo Area,Tibet(Resources SurveyEnvironment,ISSN1671-4814,CN32-1640/N,34(4),2013,p.221-227,2illus.,2tables,22refs.)Key words:biostratigraphy,Lower Permian,Middle Permian,Tibet     

MATHEMATICAL GEOLOGY

正20142560Hu Hongxia(Regional Geological and Mineral Resources Survey of Jilin Province,Changchun 130022,China);Dai Lixia Application of GIS Map Projection Transformation in Geological Work(Jilin Geology,ISSN1001-2427,CN22-1099/P,32(4),2013,p.160-163,4illus.,2refs.)     

GEOCHEMISTRY

正20140692 Duo Tianhui(No.402 Geological Team,Exploration of Geology and Mineral Resources of Sichuan Authority,Chengdu611730,China);Wang Yongli Computer Simulation of Neptunium Existing Forms in the Groundwater(Computing Techniques for Geophysical and Geochemical Exploration,ISSN1001-1749,CN51-1242/P,35(3),