METAMORPHISM AND GEODYNAMICS AT THESOUTH BOUNDARY OF THE DABIE ECLOGITE TERRAIN, CHINA

1.IntroductionTheexhumationprocessandmechanismoftheultrahigh-pressure(UHP)metamorphicrocksformtheDabie-SuluregionofChinaremainnuclear,althoughsomehypothesishavebeensuggested,suchaspop-up(OkayandSengor,1992),wedge-extrusion(Maruyamaetal.,1994),buoyancy(Emstetal.,1995),squeeze-up(Wang,1996),aswellasdelamination(Lionetal.,1996).Anysuccessfulhypothesisshouldstandatest,thatistheauthenticrecordpreservedintheorogenicbeltwheretheUHProcksdeveloped.TheDabie-SuluUHProcksoccurasamemberinthecollisi…     

TECTONIC IMPLICATIONS OF TRANSITIONALECLOGITE FROM HAIYANGSUO, RUSHAN COUNTY, EASTERN SHANDONG PENINSULA

1.IntroductionInrecentyears,northernJiangsuandsoutheasternShandongprovinceineasternChina,theSu-Luregion,hasdrawnmuchattentionforitsnumerousoccurrencesofcoesite-bearingcclogites(YangandSmith,1989;Hirajimaetal.,1990,1992,1993,EnamiandZang,1993;Zhaoetal.,1992;WangQetal.,1993;YeandCong,1993,Yeetal.,1996),UHPgamet-lherzolite(Yangetal.,1993,Zhangetal.,1994;Hiramatsuetal.,1995),UHPmarble(YeandHirajima,1996;Katoetal.,1997)andUHPmetagranitoid(Hirajimaetal.,1993;Zhangetal.,1996,Wallisetal.,…     

澳大利亚1995—1996年度将产金280t

据《中国黄金报》报道,澳大利亚农业和资源经济局估计,1995(7月)—1996年(6月)度,澳大利亚黄金产量将达到280t。并预计至2000年将增至年产360t。上年度产量为242t,仅次     

Study on the Gravity Field and Deep-Seated Crustal Structure at the North Margin of the Qinghai-Tibet Plateau

1.I~ductionThenorthernmarginoftheQinghai-TibetplateauincludestheAltllnMis.,theQilianMis.,KunlunMis.,theQaidambasinandthesouthernTarimbasin.ThisareaistCctonicallycharacterizedbyintensiveCenozoicdeformationwithcomplicateddeformationalmechedsm(Molnaretal.,1987;Zheng,1991;Culetal.,1994;Ding,1995andXuetal.,1996).Thedeformationalmechanismsincludethrust-napping,strike-slipping,extensionandblockrotation,aswellassimultaneousupliftingandtypicalbasin-rangetectonics(CulandXu,1996).IntermsofCenozoi…     

THE MIANLUE TECTONIC ZONE IN SOUTH QINGLING AND ITS GEOLOGICAL SIGNIFICANCE

1. IntroductionThe discovery of the ophiolites (composed of mafic-ultramafics plutons, radiolarian silicalites and the basic metavolcanic rocks) in Mianlue zone was one of the most important progresses in the study on Qingling orogen in recent years (Zhang G W et al., 1995, 1996; Zhang Z Q et al., 1996; Yin et al., 1998; Lai, 1997; Lai et al., 1996; Meng et al., 1999). Many geologists got the conclusions as followings. (1) along the Mianlue zone, the oceanic crust developed in late Paleoz…     

MULTI-PERIODIC COLLISIONAL PROCESS BETWEEN INDIAN AND ASIAN CONTINENTS:A CASE OF EASTERN HIMALAYAN SYNTAXIS AND HENGDUAN MOUNTAINS

MULTI-PERIODIC COLLISIONAL PROCESS BETWEEN INDIAN AND ASIAN CONTINENTS:A CASE OF EASTERN HIMALAYAN SYNTAXIS AND HENGDUAN MOUNTAINS1　ZhongDalai,DingLin .RisingprocessoftheQinghai Xizang (Tibet) plateauanditsmechanism[J].ScienceInChina (se riesD) ,1996 ,39(4) :36 9～ 379. 2　DingLin ,ZhongDalai,PanYusheng ,etal.Fission trackevidenceforNeogenetoQuaternaryupliftoftheeasternHi malayansyntaxis[J].ChineseScienceBulletin ,1995 ,40 (16 ) :…     

New Eoenantiornithid Bird from the Early Cretaceous Jiufotang Formation of Western Liaoning, China

1 Introduction Enantiornithes were the most blooming branch among the early birds and had distinct diversities. They flourished in the Early Cretaceous (Kurochkim, 1985; Chiappe, 1991; Sanz and Bonaparte, 1992; Boles, 1995; Elzanowski, 1995), and become extinct at the end of the Late Cretaceous. Lots of the birds have been reported in western Liaoning, China (Sereno and Rao, 1992; Zhou, 1995; Hou, 1996, 1997; Sanz and Chiappe, 1996; Sanz et al., 1997; Hou and Chen, 1999; Hou et al., 1…     

DIVISION OF PETROLOGICAL-TECTONIC UNITS IN THE NORTHERN SULU ULTRA-HIGHPRESSURE ZONE: AN EXAMPLE OF THICK-SKIN THRUST OF CRYSTALLINE UNITS

1.IntroductionTheDabieshan-SuluUHPMzoneseparatestheNofthChinacratonandYangtzecraton.High-pressureandUHPMrocksandrelatedrocksrepresenttypicalrockformationincontinent-continentcollisionalzone.ItisgenerallytoacceptedthattheUHPMzoneiscutateastpartofDabieshanandtransformedabout500--600kmtonorthinSuluarea.TheDabieshanmetamorphicterrainhasbeensubdividedintothreepetrological-tectonicunitsfromnorthtosouth(Zhaietal.,1995;ZhaiandCong,1996),whicharenorthernDabieshancomplex(Andeantypemagmaticarcc…     

诺里尔斯克Cu-Ni-PGE硫化物矿床成矿过程流体组成示踪

诺里尔斯克(Noril’sk)Cu-Ni-PGE硫化物矿床位于西伯利亚大火成岩省的西北边缘,是251.2±0.3Ma(Kamo et al.,1996)地幔柱岩浆作用体制下大火成岩省成矿的典型实例(Basu etal.,1995)。岩浆演化过程中围岩膏盐层对硫饱和成矿具有重大的贡献,本研究通过大火成岩省喷出岩和成矿岩体中流体组成特征对比,探讨成     

南非黄金产量继续下降

据《中国黄金报》报道,南非黄金产量连年下降,1995年又比前年下降10％,只生产了524t。工业分析家认为,南非1996年的黄金产量将下滑到40年来最低点,只有518t。估计南非最大的产金公司——英美公司将从1995年的224.2t降至1996年的221.5t,其下属的弗里戈尔德矿——世界最大的金矿中的5个矿井由于利润不高,在1996年第一季度将关闭,使今年     

STRUCTURES OF POISSON'S RATIO OF THE QINLING-DABIE OROGENIC BELT

1.IntroductionThecontinentalcrustandtheuppermantlehavebeenasubjectofmanytomographicstudiesofvanationsinp-wavevelocity.Duringtwodecaysthesestudiesprovidedvelocityimagesofthecrustandthemantleinsubductionzones,convergenceareas,faultbelts,volcanicareas,seismicareasandorogenicbelts(VanderHistetal.,I991,Spakman,1991;Aki&Lee,1976,LiuFutianetal.,1987;Iyer&Dawson,1993;Sun&Liu,1995;Sunetal.;1996,Liuetal.,1995).However,theseimagesleaveussomequestions.Forexample,howreliabletheyare?Ormorespecifically…     

GEOCHEMISTRY OF VOLCANIC ROCKS FROM WULIBA IN THE MIANLUE SUTURE ZONE, SOUTHERN QINLING

1. IntroductionThe Mianlue (Mianxian-Lueyang) suture zone is one of the components of the Qinling orogenic belt and the latest major suture zone between North and South China. The data available suggest that it is a complicated ophiolitic tectonic melange zone including many tectonic slabs of different origins (Zhang et al., 1995; Lai et al., 1996; Lai et al.,1997; Lai et al.,1998; Xu et al.,1996). Up to now, however, there is not definite evidence of volcanic rock assemblage and geochemi…     

北阿尔金地区米兰红柳沟的早古生代蛇绿岩

阿尔金地区以巨型阿尔金走滑断裂而著称,断裂以西为阿尔金山地区,以东为祁连山地区.近年来人们陆续在阿尔金断裂两侧发现榴辉岩带,即南阿尔金榴辉岩带(车自成等1995;刘良等1996)和柴北缘榴辉岩带(杨经绥等,1998,2000),指出阿尔金断裂两侧的岩石单元可以对比,并推断阿尔金断裂左行走滑位移了约400 km(许志琴等,1999;葛肖虹等,1999).     

1996年我国生产黄金超过120吨

据悉,1996年我国生产黄金达到120.6t,比1995年增长11.8％。全国31个生产黄金的省(市、区),黄金生产实现了国家下达的生产计划。其中山东、河南、河北、陕西等省黄金生产有较大幅度增长,山东增长幅度达13.1％。中西部地区的新疆、青海、贵州、四川等省(区)增长幅度达15％以上。     

气候变暖背景下祁连山七一冰川融水径流变化研究

本文利用2006年实测水文数据,找出冰川自动气象站气温与冰川融水径流量关系,并根据酒泉气象站与冰川末端气象站气温关系,重建1960～2004年七一冰川融水径流资料.近40多年来,酒泉站气温增加幅度为0.24℃/10a,冰川融水量增加幅度为0.076×106 m3/10 a,冰川融水量随气温增加明显.利用气候突变分析发现,气温发生突变点为1996年,1996～2004年冰川表面年平均气温比1960～1995年间高0.41℃,年冰川融水量1996～2004年比1960～1995年增加了0.41×106 m3(增加26.9%),冰川融水径流量在气候变暖背景下变化显著.     

Two Discrete UHP and HP Metamorphic Belts in the Central Orogenic Belt, China

INTRODUCTION Anew ultrahigh pressure ( UHP) metamorphicbelt ,the South Altun-North Qaidam-North QinlingUHP metamorphic belt ,has been recently discoveredand widely discussed by different workers (Yang J Set al .,2003 ,2002 ,2001 ,2000 ,1998 ;Zhang J Xetal .,2002 ,1999 ; Zhang G et al .,2001 ; Hu et al .,1996 ,1995 ,1994) . Detailed studies have also beencarried out onthe Dabie-Sulu UHP/ HP metamorphicbelt inthe central orogenic belt (COB) of China (Gaoet al .,2002 ;Sun et al …     

The First Mesozoic Heterodactyl Bird from China

1 Introduction Enantiornithines were the dominant birds nearly worldwide throughout the entire span of the Cretaceous (Chiappe, 1995; Feduccia, 1996). The adaptive radiation of opposite birds is little known besides the disparity of rostral morphology in Boluochia (Zhou, 1995), Longipteryx (Zhang et al., 2001), Longirostravis ( Hou et al., 2004), and the presence of stomach contents that reflect a diversity of diets. Like the structure of rostrum, differentiation of the locomotor apparatu…     

Distribution and Geochemical Implication of Aromatic Hydrocarbons across the Meishan Permian-Triassic Boundary

INTRODUCTIONThe Permian-Triassic ( Tr/P) boundary , datedto be (251 .4±0 .3) Ma ago ,is marked by the mostdrastic mass extinction of organisms in the Phanero-zoic .In order to explore the pattern and the cause ofthe mass extinction,extensive research has been fo-cused on biostratigraphy , isotopic chronostratigra-phy , event stratigraphy , ecostratigraphy and se-quence stratigraphy (Payne et al .,2004 ; Reichowetal .,2002 ; Yin et al .,2001 ;Jin et al .,2000 ;Zhanget al .,1996 ,1995 ;…     

Grade and Tonnage Model of Contact Metasomatic Copper Deposit in China

INTRODUCTIONSystematic exploration theory is an important aspect ofquantitative prediction and exploration assessment of m ineralresources.Recently,the three- stage quantitative evaluation ofmineral resources (China Mineral Information ResearchInstitute,1996 ;Zhao,1995 ) is widely carried out in the West.The three- stage prediction and evaluation includes:1findingpracticable prospect area on the basis of analyzing m etallogenicgeological setting,2 establishing grade- tonnage model oftar…     

易门铜厂矿区铜矿床地质特征及找矿方向

<正>易门铜矿带位于康滇地轴南段南北向易门断裂与绿汁江断裂夹持的峨腊厂-狮子山之间,可分为东、西两个矿带(孙家骢等,1995)。前人对易门铜矿带做了大量研究工作,勘查单位、大专院校和地质研究单位等均从多层次、多角度对易门铜矿带进行过深入研究(刘卫华,1986;冉崇英,1989,2014;西南地质勘查局,1994;高建国,1996;孙克祥,1996;孙家骢等,1998;韩润生等,2000;唐果,2011),不断的加深对成矿作用的认识,研究成果丰富。但研究主要集中在狮子山、三家厂、凤山等典