Pressure State in Deep Crust and Formation Depth of UHP Metamorphic Rocks

INTRODUCTIONSincethediscoveryofeclogiteswithcoesiteanddia mondinclusionsrelatedtothecontinent continentcollision orogenyenvironment,theultrahigh pressuremetamorphism(UHPM )intheDabie Suluhasarousedgreatinterestinmanygeologists (Liouetal .,1994 ;Xuetal.,1992 ) .Experimentalstudieshaveprovedthatsuchmineralsasdia mond ,coesiteandomphaciteoccurredat 2 - 5GPa (andatthecorrespondingtemperatures) (Stevenetal.,1982 ;MirwaldandMasonne ,1980 ) .However,itdoesnotmeanthatthemetamorphicrockscanbe…     

岩浆矿床硫化物铼锇组成及其矿物学特征初探

<正>~(187)Re经β衰变后成为~(187)Os,且Re和Os属亲铁元素并具有一定程度的亲硫性可在硫化物矿物中富集,因此Re-Os同位素体系可对金属硫化物矿物直接进行定年(Luck and Allègre,1982;Stein et al.,2000;Morelli et al.,2005)。辉钼矿因具有较高的Re     

出现于β-A1_2TiO_5的固相合成及热分解过程中的待定归属相

在由-αA l2O3和T iO2合成-βA 12T iO5时,文献报道有待定归属相(称作x相)先于-βA 12T iO5出现在煅烧后的混合物内,该x相表现出中间产物相特征,据说它在混合物内的含量随煅烧温度升高而增大,1 400℃时出现-βA 12T iO5,且x相与未转化反应物均转变成-βA 12T iO5。研究煅烧共凝胶法前驱体制备-βA 12T iO5的固相反应以及-βA 12T iO5的热分解过程,以了解该待定归属相的生成、演变规律。同文献报道的x相相比该相的初始生成温度、转化为-βA 12T iO5的温度均有明显降低,1 150℃煅烧共凝胶法前驱体所获产物的XRD图谱(18°≤2θ≤58°)内出现3个归属该x相的衍射峰,它们的峰中心分别位于2θ=41.2,°44.0,°24.9°(按相对峰强大小排列)。M gO掺杂使该x相与少量-βA 12T iO5相共同出现于1 150℃及1 200℃煅烧物内。1 250℃煅烧使该相失稳,转变为-βA 12T iO5,同时使未转化的金红石、-αA l2O3完成固相反应。对比表明x相的转变温度具有阈值特征,前驱体的微细化使之大大降低。本研究首次发现,伴随-βA 12T iO5在1 100℃下的热分解,该待定归属相重新出现,说明该相随热过程条件改变具有生成-消亡-重新生成的可逆性。它的消亡及重新生成体现出同-βA 12T iO5此消彼长的相关性。它应该是除-βA 12T iO5、A 12T i7O15以外的第三种铝、钛复合氧化物。     

EXPLORATION ENGINEERING

20110705 Geng Shuxiao(No.6 Drilling Engineering Company,CNPC Bohai Drilling Engineering Co.,Ltd.,Jinzhou 052260,China);Zhang Yongqing Treatment Practice for Sticking Failure in Horizontal Well and Discussion on the Prevention Measures(Exploration Engineering,ISSN1672-7428,CN11-5063/TD,37(2),2010,p.9-13,3 illus.,3 tables,3 refs.,with English abstract)Key words:horizontal wells,drill pipe sticking20110706 He Yuandong(Guizhou Yuandong Xiongdi Drilling Co.Ltd.,Guiyang 550000,China);Gao Bo Acknowledgement abo...     

慢速洋中脊超基性岩热液区热液产物特征

<正>慢速洋中脊离轴区高温热液对流系统主要建立在超基性岩基础上,其成矿流体为碱性还原性流体(Bach et al.,2010),流体组分很大程度上取决于高温海水与超基性岩的水-岩反应,该类热液区上的块状硫化物因此表现出相对特殊的矿物组成和化学成分(Klevenz et al.,2011)。我们对Rainbow区(Lein et al.,2003)、Logatchev(Gablina et al.,2000)、Ashadze(Mozgova et al.,2008)等离轴区热液喷口流体     

云南九顶山铜钼矿床年代学与地球化学特征

<正>西藏东部到云南西北,形成了著名的三江-特提斯成矿带,有着丰富的铜、铬、钴、铅、锌及金、铂族元素和稀土元素储量(邓军等,2010)。三江成矿带内成矿类型丰富多样,如斑岩型铜钼矿床、喷流沉积型铁矿、剪切型金矿等(Hou et al.,2007)。印度板块与欧亚大陆板块碰撞后在青藏高原东缘形成金沙江-哀牢山-红河走滑剪切带,沿此构造带分布着众多喜马拉雅期富碱斑岩侵入体,与许多具有前景的斑岩型铜、钼、金矿床存在密切联系(侯增谦等,2004;Hou et al.,2006;Liang et al.,2007)。     

ENGINEERING GEOLOGY

20061181 Chai Shouxi (Resources and Envi-ronment College, Lanzhou University,Lanzhou 730000, China); Han Wenfeng Ex-periment on Artificially - Prepared ClaySamples by Freeze-Drying for SEM (CoalGeology & Exploration, ISSN1001-1986,CN61-1155/P, 33(2), 2005, p.46-48, 1illus., 1 table, 11 refs., with English ab-stract)Key words: clay20061182 Fu Xiaomin (Geological HazardsPrevention and Geological Environmental Pro-tection National Specialty Lab., Chengdu U-niversity of Technology…     

ROCKS&MINERALS DETERMINATION AND ANALYSIS

20070970 Cheng Jian(Center of Analysis and Testing,Hunan Zhuye Torch Metals Co., Ltd.,Zhuzhou 412004,China)Direct Deter- mination of Lead in Refined Indium by Flume Atomic Absorption Spectrometry (Rock and Mineral Analysis,ISSN 0254- 5357,CN11-2131/TD,25(1),2006,p.91 -92,94,1 illus.,7 tables,5 refs.) Key words:lead,atomic absorption     

ECONOMIC GEOLOGY

20080252 Zhai Yusheng(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China) Earth System,Me-tallogenic System to Exploration System(Earth Science Frontiers,ISSN1005-2321,CN11-3370/P,14(1),2007,p.172-181,6 illus.,18 refs.,with English abstract)     

PALEONTOLOGY

20091168 Liu Yan(China University of Geosciences, Beijing 100083,China);Sun Keqin Study on the Permian Paleophytogeographical Provinces in Tibet(Geological Review,ISSN0371-5736,CN11-1952/P, 54(3),2008,p.289-295,2 illus.,1 table, 34 refs.,with English abstract)     

Mississippian foraminifers from the Onimaru Formation in the Hikoroichi area, South Kitakami Belt, Northeast Japan

Abundant foraminifers were found from the Mississippian Onimaru Formation distributed in the Hikoroichi area of the central part of the South Kitakami Belt, Northeast Japan. They include Brunsia pulchra, Archaediscus sp., Paraarchaediscus? sp., Neoarchaediscus? sp., Palaeotextularia spp., Climacammina, spp., Tetrataxis spp., Haplophragmella sp., Lituotubella? sp., Forschiella sp., Cribrospira sp., Bradyina spp., Janischewskina sp., Endothyra spp., Planoendothyra aljutovica., Endothyranopsis compressa, E. crassa, Omphalotis samarica, Eo-staffella spp., Mediocris breviscula, and several others. The Onimaru foraminiferal fauna is similar to those re-ported from MFZ (Mamet Foraminiferal Zone) 15-16. This supports a late Visean (V3b-V3c) age of the formation, which has been proposed previously by rugose corals.     

PALEONTOLOGY PALEOBOTANY

20070413 Hao Shougang (School of Earth and Space Sciences, Peking University, Beijing 100871); Wang Deming New Lycopsid, Zhenglia radiata gen. et sp. nov., from the Lower Devonian Posongchong Formation of Southeastern Yunnan Province, China, and Its Evolutionary Significance (Acta Geologica Sinica (English Edition)--Journal of the Geological Society of China, ISSN1000-9515, CN11-2001/P, 80(1), 2006, p.11-19, 2 illus., 1 plate, 46 refs., with English abstract) Key words: Lycopodiales, Yunnan Province     

COAL GEOLOGY

20091159 Gao Yan(No.3 Prospecting Team of Anhui Bureau of Coal Geology,Suzhou 234000,China) Effect of Depositional Environment of Coal-Bearing Stratum on Major Coal Seams in Suntan Coalmine,Anhui Province(Geology of Anhui,ISSN 1005- 6157,CN34-1111/P,18(2),2008,p.114 -117,5 illus.,1 ref.,with English abstract)     

GEOCHEMISTRY

20051907HanGuilin(InstituteofGeochem-istry,ChineseAcademyofSciences,Guiyang,Guizhou550002,China);Liu CongqiangControllingFactorsforVariation inDissolvedRare-EarthElementsinKarstDrainageBasin(CarsologicaSinica,ISSN1001-4810,CN45-1157/P,23(3),2004,p.177-186,5illus.,1table,27refs.,with Englishabstract)Keywords:karst,rivers,rare-earthele-ments20051908LinCaihao(ChinaUniversityof Geosciences,Wuhan,Hubei430074,China)GeochemicalClassificationofSoilsinthe DownstreamAreaoftheJiulongRiv…     

GEOPHYSICS

20051870CaiXuelin(ChengduUniversityof Technology);ZhuJieshouStructuresof LithosphereandAsthenosphereinHeishiof Sichuan-HualianofTaiwanProfile(Jour-nalofChengduUniversityofTechnology(Science&TechnologyEdition),ISSN1671-9727,CN51-1634/N,31(5),2004,p.441-451,5illus.,1table,50refs.,with Englishabstract)Keywords:lithosphere,asthenosphere,China20051871GaoDezhang(InstituteofShanghai OffshorePetroleumBranch,SINOPEC,Shanghai200120);ZhaoJinhaiAProfile StudyonGravitative-MagneticandSe…     

ECONOMIC GEOLOGY (3)PETROLEUM GEOLOGY

20071077 An Zuoxiang(Petroleum Industry Press,Beijing 100011,China);Ma Ji On Bo- real-Style Petroliferous Domain(Xinjiang Petroleum Geology,ISSN1001-3873,CN65 -1107/TE,26(4),2005,p.432-436,4 illus.,9 refs.,with English abstract) Key words:oil and gas fields     

滇西北休瓦促晚白垩世高分异Ⅰ型花岗岩成因及其对藏东地区晚中生代构造演化的限定

在印度—欧亚板块碰撞之前,拉萨—羌塘板块之间的碰撞也是导致青藏高原隆升的重要原因,而且也是地球科学中一个热点课题(Sengor,1979,1987;Murphy et al.,1997;Wang et al.,2008;Zhang et al.,2012;Zhu et al.,2013)。然而,中特提斯洋何时关闭,以及拉萨—羌塘板块之间碰撞的延续时间仍然在持续的讨论中(Murphy et al.,1997;Zhu et al.,2013;Zhang et al.,2012,2014)。先前的研究主要集中在拉萨和羌塘板块内部,少有关注藏东地区的岩浆活动对青藏高原晚中生代演化的限定。Wang等(2014a)研究已发现藏东义敦岛弧晚白垩世(110~80 Ma)花岗岩的形成可能与拉萨—羌塘板块之间的碰撞有关,深入研究这些岩体的成因及区域热演化历史将有利于对藏东地区晚中生代构造演化作出进一步的限定。休瓦促晚白垩世的岩体位于义敦岛弧南段的中甸地区,主要由3个岩相组成:岩相1黑云母花岗斑岩、岩相2二长花岗岩和岩相3浅色碱性长石花岗岩,它们的成岩年龄为85.5~84.4 Ma。这3个岩相为准铝质到弱过铝质(A/CNK=0.96~1.07),具有较高的Si O2(70.0%~76.0%)、K2O+Na2O(7.5%~10.7%)、Ga/Al(2.5~4.7),及较低的CaO(0.39%~1.67%)、Mg O(0.01%~0.57%)和P2O5(0.01%~0.17%);相对富集LREEs、Rb、Th、U和Ta,相对亏损HREEs、Ba、Sr、P和Ti,并具有负的Eu异常(Eu/Eu*=0.24~0.59)。相比于经典的A型花岗岩,休瓦促晚白垩世花岗岩具有较高的Sr((10.1~256.0)×10-6,多数大于100×10-6)及较低的Fe O*/Mg O(1.2~9.9)和Zr+Nb+Ce+Y((248~483)×10-6,多数小于350×10-6),呈现出高分异I型花岗岩的特征。这3个岩相均具有相对较高的(87Sr/86Sr)i(0.707 5~0.709 8)值,负的εNd(t)(-8.0~-6.9)和εHf(t)(-7.6~-3.2)值,及古老的Nd和Hf模式年龄(1.7~1.3 Ga),指示它们具有相似的来源即来自于古老的中基性下地壳的部分熔融;此外,锆石的δ18O值具有较大的变化范围(5.9‰~8.4‰,部分小于6.5‰),且在岩体中广泛发育的镁铁质包体指示源区还有部分幔源物质的加入(Valley et al.,2005)。尽管休瓦促晚白垩世岩体相比于同地区同时代的具有埃达克质的热林、红山和铜厂沟岩体(Wang et al.,2014a),具有相对较高的Si O2和较低的Sr/Y比值,但这4个岩体具有相似的(87Sr/86Sr)i、εNd(t)、εHf(t)和δ18O值,指示着它们具有相同的来源。故休瓦促晚白垩世花岗岩成因模式可概括为,在拉萨—羌塘地块晚碰撞—碰撞后伸展背景下,伸展减压作用导致幔源熔体上涌,促使加厚下地壳物质发生部分熔融,形成的熔体与少量幔源物质混合,之后经历较强的结晶分异作用而形成。前人已在松潘—甘孜地块西缘、羌塘地块及义敦岛弧等藏东地区开展了大量的低温热年代学研究(Jolivet et al.,2001;Lai et al.,2007;Reid et al.,2005a;Wang and Wei,2013;Wilson and Fowler,2011;Xu and Kamp,2000;Zheng et al.,2006)。本文通过统计这些研究中三叠世花岗岩的磷灰石裂变径迹年龄发现,在藏东地区存在着一期约90Ma的地壳整体抬升事件。结合中甸地区在86~80 Ma发育有形成于晚碰撞—碰撞后伸展环境的花岗岩,指示着拉萨—羌塘板块的碰撞作用及藏东地区的地壳抬升时间可能要早于晚白垩世,并且拉萨—羌塘地块的碰撞作用直到80 Ma仍然没有停止(Wang et al.,2014b)。     

ENGINEERING GEOLOGY

正20162769 Cao Jun(Baotou Highway Bureau of Inner Mongolia,Baotou 014040,China)Performance Based Slope Supporting Structure Seismic Design(Journal of Engineering Geology,ISSN1004-9665,CN11-3249/P,23(5),2015,p.844-849,7illus.,5tables,20refs.,with English abstract)Key words:slope stability,tunnel support,aseismic design     

PETROLOGY

20051919ZhaoYajuan(InstituteofGeology andGeophysics,ChineseAcademyofSci-ences,Beijing100029,China);ZhangYi-gangPressureDependenceofViscosityand Self-DiffusioninCaAl2Si2O8Melt:A MolecularDynamicsStudy(ActaPetrologicaSinica,ISSN1000-0569,CN11-1922/P,20(3),2004,p.737-746,7illus.,2ta-bles,36refs.,withEnglishabstract)Keywords:high-temperature-high-pressure,anorthite,viscouseffect(1)IGNEOUS PETROLOGY20051920JinXia(No.4GeologyandMineral ExplorationTeam,GansuProvincialBureau of…     

ROCKS & MINERALS DETERMINATION AND ANALYSIS

20090237 Gao Jiafei (Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China); Ding Diping Laser Microprobe Oxygen Isotope Analysis Method and Geology Applications (Geological Review, ISSN0371-5736, CN11-1952, 54(1), 2008, p.139-144, 2 illus., 1 table, 30 refs., with English abstract)