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1.
本文报导了玛米雪山北坡的腕足动物化石。玛米雪山北坡含此化石的地层过去划归白垩系,腕足动物化石在此地的发现是第一次,它对于本区地层系统的建立及重建本区地质历史和古地理环境都有重要意义。 玛米雪山北坡腕足类化石、数量非常多,本文共描述了12个属15个种,其中新属1个,新种6个,它们是:Trichochonetes xizangensis sp.n.,Neo-chonetes gigantea sp. n.,Canorneilla semicircularis sp. n.,Ovatiamamixueshanensis sp. n.,Lissochonetes sp.,Marginifera sp.,Tib-etospirifer xizangensis gen.＆ sp. n.,T. mamixueshanensis sp.n.,Brachythyrina stranywaysi(Vern.),B.rectangula(Kut.),B.lataChao,Choristites cf. xianzaensis Yang,Neospirifer sp.,Punctos-pirifer sp.,Dielasma spp..并依据岩性和化石组合特征建立了一个新的地层单位—玛米雪山组,时代为晚石炭世。 相似文献
2.
Discovery of the Middle-Late Triassic elasmobranch ichthyoliths from the Guanling area,Guizhou,SW China 总被引：4，自引：0，他引：4
应用Johns等(1997)的形态分类系统，对首次报道出现于贵州关岭地区中上三叠统的软骨鱼类的微体化石进行了初步研究，描述了其中的1个牙齿化石(可能属于弓鲛鳖科的)和7个鳞片类化石的形态属种，其中包括两个鳞片类化石的新属种，即Lobaticorona cf. floriditurris,Sacrisubcorona co. circabasis,Glabrisubcarona co.arduidevexa,Parvi-corona dacrysulca n.gen.et.n.sp.s.f.Annulicorona pyramidalis n.gen.et.n.sp.s.f.,new(?) paragenera A和new(?) paragenera B。还初步探讨了软骨鱼类微体化石在三叠纪地层划分中的应用，以及中国西南部三叠纪软骨鱼类与北美相当地层中软骨鱼类的洲际对比。 相似文献
3.
正The Bayan Obo in the northern North China Craton is the world’s largest light rare earth element(LREE)deposit and the largest niobium(Nb)and thorium(Th)deposit in China(e.g.,Wu,2008;Kynicky et al.,2012;Ling et al., 相似文献
4.
本文描述了采自河南南部桐柏地区蔡家凹大理岩中的放射虫化石,共计7属8种（其中1新属2新种）, 包括 Archaeospongoprunum compactum Nakaseko et Nishimura, Yangia chinensis Feng,Shengia yini (Feng), Cenosphaera sp., Triassocampe ? sp., Pactarentinia sp., Triassomitra zhangi n. gen. etsp.和Triassomitra litangensis n. gen. et sp..该动物群形成于三叠纪早期半深海环境,这是在桐柏-大别地区首次发现海相三叠纪地层,据此推论,二叠纪至三叠纪早期,古秦岭洋贯通秦岭-大别地区,是沟通古特提斯和古太平洋的重要通道,印支运动使秦岭-大别洋盆最终封闭。 相似文献
5.
1 Introduction The Gaojiacun intrusive complex is one of the numerous ultramafic-mafic intrusions in Sichuan Province of China. It was mapped during the 1970s and studied mainly by Chinese scientists (e.g. Geological Team 106, 1975; Shen et al., 1986, 1989; CGGJC, 1986; Yang et al., 1993; Li et al., 1995; Shen et al., 2003; Zhu et al., 2004a). Since the year 2000, China has become one of the largest PGE consumers. While the country can produce only less than 1 ton PGE/year, the Chin… 相似文献
6.
《Scientia Geologica Sinica》1999,(1)
1.IntroductionStudyontheclimaticchangesontimescalesof10'-yearduringthelastdeglaciationperiodandtheirenvironmentaleffectsmaybeexpectedtoprovidevaluableknowledgeforpredictingpossibletrendofclimaticchangesinthefutUreglobalwarming.TheclimaticsignalsinrelationwiththeNorthAtlanticYoungerDryasEventhavebeenreportedinalargenumberofterrestrialrecordsinChina(e.g.Gasseetal.,1991,Anetal.,1993)andinthesurroundingoceans(Kudrassetal.,1991;Broekeretal.,1988,Wangetal.,1994).However,theclimaticbehaviourofth… 相似文献
7.
The application of gas chromatography fingerprint technique to calculating oil production allocation of single layer in the commingled well 总被引：2，自引：0，他引：2
1Principle SincetheGCfingerprinttechniquewasfirstused tomonitortheproductionofoilfieldsbyAmericansci entists(KaufmanandAhmed,1990;Kaufmanetal.,1987)inthe1980s,manyresearchershavetentatively appliedthismethodinseveraloilfields(HeWenxiang etal.,1996;2001;WangZhengpingetal.,2000;ChenShijiaetal.,1999)andhaveachievedsatisfac toryresults.Butthereappearsomeobviousdeficien ciesinthecourseofexplorationanddevelopment.Takinganthraceneasinternalstandard,wecalculated theabsoluteconcentrationsoffingerp… 相似文献
8.
湖南中泥盆统一下石炭统海参化石 总被引：3，自引：0，他引：3
本文描述了湖南中泥盆统—下石炭统海参化石6个属、12个种(1个新属、8个新种):T huroholia crassa sp. nov., Th. hexangularia sp, nov., Th.pulchra sp. nov., Th. marginata Langenheim＆Fpis, Th. regularis sp. nov., paraeocaudina minularis gen. et sp. nov., Paracucumarites asymmetricus sp, nov., Protocaudina traquairii(Ftheridge). Pro. symmetrica sp. nov., Microantyx betoni Gutschick. Mortensenites teat sp. nov,, 讨论了它们的地层分布和地层对比。此外,扼要地介绍了海参化石基本构造及其地层意义。 相似文献
9.
本文描述眼甲科化石1新属1新种和波纹眼甲属Amblomma中5新种:瘤点宽眼甲Euryommatylodesgen.et sp.nov.,圆齿波纹眼甲Amblommacyclodontasp.nov.,稍小波纹眼甲Amblommaminisculasp.nov.,前伸波纹眼甲Amblommaporrectasp.nov.,美脉波纹眼甲Amblomma eumeurasp.nov.,和延展波纹眼甲Amblommaprotensasp.nov.,并给出波纹眼甲属内种间检索表。前缘边显著加宽,这一特征表明宽眼甲属很可能是眼甲科中一个比较原始的类群。义县组沉积形成时频繁的火山活动产生的环境变化可能是造成同一化石产地发现Amblomma属内多个不同种的重要原因。中国热河生… 相似文献
10.
王敏成 《吉林大学学报(地球科学版)》1991,(3)
1986年辽宁省地矿局区调队在大连市棋盘磨和杨家屯震旦系兴民村组发现水母类化石。本人进行了较详细的研究,根据其结构和生态特征,确定为腔肠动物门水螅虫纲水母化石,并命名为大连水母动物群。文中对其中的2个新属,7个新种进行了描述,它们为:Cyclomedusa qipanmoensis sp.nov.,Cyclomedusa stellatus sp.nov.,Medusinites monoseamoformis sp.nov.,Medusinites planodiscifo-rmis sp.nov.,Ellipsomedusa liaonanensis gen.et sp.nov.,Ellipsome-dusa dalianensis gen.sp.nov.,Quadratimedusa liaoningensis gen.etsp.nov.这一发现和研究无疑确定了大连地区震旦系的存在。 相似文献
11.
正Asian aridity can be traced back to the early Cenozoic (e.g.,Guo et al.,2008;Licht et al.,2016;Li et al.,2018a).Previous modelling studies focus mainly on the monsoon climate during the early Cenozoic,and studies for the Asian aridity are still limited (e.g.,Huber and Goldner,2012;Zhang et al.,2012;Li et al.,2018b).Here Asian aridity during the early Cenozoic is investigated through climate modelling by changing atmospheric CO_2 concentration,orbital parameters,and topography. 相似文献
12.
《Scientia Geologica Sinica》1999,(1)
1.IntroductionForelandbasin,thesedimentarybasinlyingbetweenthefrontofanorogenandtheadjacentcraton,isanimportantaspectforthestudyonlithospheretectonicevolutionoforogen(e.g.,Tankard,1986,Ren,etal.,1991;Li,1992,Chen,etal.,1992,Liu,etal.,1994,LihouandAlien,1996,Li,etal.,1997,DongandZhang,1997).Currently,itisdividedintotwogenetictoes,i.e.,peripheralforelandbasinsituatedagainsttheouterarcoftheorogenduringcontinent-continentcollisionandretro-arcforelandbasinbehindamagmaticarclinkedwithsubductiono… 相似文献
13.
湖南西部和贵州东部奥陶系临湘组,地层厚度甚小,但含有较丰富的三叶虫化石,经作者研究共计11个属15个种和2个未定种,其中包括1个新属Dayongia(gen.nov.)和7个新种:Madygenia exsculpta sp.nov.,Madygenia tuberculata sp.nov.,Davongia brevica gen.＆ sp.nov.,Dayongia longicephala gen.＆ sp.nov,Eobronteus hunanensis sp.nov.,Shuma-rdia songtaoensis sp.nov.,Encrinurells exsculpta sp.nov.。这个动物群除具有我国地方性色彩外,同时具有与欧洲动物群明显的近似性。其时代应属晚奥陶世,相当于欧洲Ashgill期。 相似文献
14.
《Scientia Geologica Sinica》1998,(4)
1.IntroductionGeologistsfrommanycountrieshaverushedtotheDabieMountainsandSuluultfahighpressure(UHP)metamorphiczonewherecoesite-bearingeclogitewasdiscoveredintheendof1980s(XuZ.,1987;Okayetal.,1989;WangX.,1989;Enami&Zang,1990).Theywereengagedincooperativestudiesofpetrology,mineralogy,geochronology,geochemistry,andsmicturalgeology.Amongthem,thekeyproject"TheDabie-SuluUHPbeltanditstectonicimplication",aswellasothergeneralprojects,financedbytheNationalNearalSciencefoundationofChina(NSFC)… 相似文献
15.
Environmental Assessments of Trace Metals in Sediments from Dongting Lake, Central China 总被引：1，自引：0，他引：1
INTRODUCTIONFresh water lakes are one of the planet’s mosti mportant freshwater resources.They support life invarious forms,develop tourism and provide uniquerecreational opportunities.It is also a good source ofthe provision of drinking-water for local communi-ties.Studies on trace elements in rivers,lakes,andsedi ments(Zhou et al.,2004;Gray et al.,2000;Grosheva et al.,2000;Klavins et al.,2000;Aucoinet al.,1999;Bortoli et al.,1998;Elbaz-Poulichet etal.,1996;Johansson et al.,1995;F r… 相似文献
16.
17.
Guoxiang Chi 《地学前缘(英文版)》2011,(3):421-422
1.Introduction Most metallic mineral deposits formed from hydrothermal fluids,and the mineralization processes include both chemical (e.g.,fluid-rock and fluid-fluid interactions)and physical(e.g., fluid flow)aspects.More attention has been paid to the chemical processes than the physical ones,even though the latter is equally important in controlling the formation of mineral deposits and their localization.Nevertheless,a number of studies have been carried out regarding the hydrodynamics of fluid flow associated with ore mineralization(e.g.,Cathles,1981,1997; Garven and Raffensperger,1997;Cathles and Adams,2005; Cox,2005;Ingebritsen et al.,2006),and it is timely to eval- 相似文献
18.
ROCK ASSOCIATIONS AND PETROGENESIS OF INDOSINIAN ALKALINE COMPLEX OF THE NORTH HEBEI PROVINCE, NORTH CHINA 总被引：1，自引：0，他引：1
《Scientia Geologica Sinica》1999,(1)
1.IntroductionPetrogenesisofigneousrocksmainlyreferstotheformationandevolutionofthemagmas.Thetwohandsaboutformationandevolutionofalkalinecomplexesarestilldebatedintheworld.Withrespecttotheformation,someresearchersproposedtheyoriginatedfromuppermantle(e.g.,CotriveauandGorton,1993);someotherresearcherssuggestedthattheycomefromlowercrust,andonlyfewresearchersthinktheywerederivedfromuppercrust(Stannskyetal.,1980).Asfortheevolution,someresearchersproposedtheassimilationandcontamination(Litvinovsk… 相似文献
19.
正Objective The Khondalite Belt is a nearly E–W-trending Paleoproterozoic Himalayan-type orogen in the Western Block of the North China Craton. It is regarded as a result of the collision between the northern Yinshan Block and the southern Ordos Block at ～1.95 Ga, which led to the formation of the united basement of the Western Block(e.g., Zhao et al., 2005; Yin et al., 2011). The Khondalite Belt has undergone long-term continent-continen collisional orogenic processes, and a remarkable series of late-stage orogen-parallel ductile shear zones developed(e.g., Huang et al., 2013; Gong et al., 2014). 相似文献
20.
non~,t一Uo一ry花ndo.几nction:(x).n.autho.us.the .ethod to吕的比.m咖1 explorative data of.o……d.t如.场v目u.,drin...odn.Ct卜二of的m二Ie二nt.,二曲..W,妞‘Cu,外,Znand的on.Th...v一lu伪w.拍u的d to evalua协梦och恤ical background一nd‘bno恤al character-istiCS.IndiCator krigingi一aPPli目to magan晰el·ement oft五e sa口e arc.to obtain the Probabilitywhen一g.nc.valuoa抢larger th.n ap抢defin比cutoff.T址传.ults一抢p傲。nted in the form ofprobability contour plot.9,10422五ao Lun比an(C五ina Univor.iry … 相似文献