全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
地质学报  2006 

青藏高原中部中生代OIB型玄武岩的识别:年代学、地球化学及其构造环境

, PP. 1312-1328

Keywords: 年代学,地球化学,构造环境,中生代OIB型玄武岩,Dupal异常,青藏高原中部

Full-Text   Cite this paper   Add to My Lib

Abstract:

目前对青藏高中部的蛇绿岩类型、形成环境及其深部地幔源区特征还缺乏很好的约束。在区域地质调查基础上,本文展示了青藏高原中部龙木错―双湖缝合带嘎错玄武岩、班公湖―怒江缝合带多玛、塔仁本玄武岩及那曲盆地西侧中生代玄武岩的单斜辉石Ar-Ar测年、锆石SHRIMP定年和地球化学及Sr,Nd,Pb同位素数据,以约束形成这些玄武岩的时代、构造环境和地幔源区特征。目前的数据表明:1羌塘双湖嘎错枕状玄武岩单斜辉石的中温坪年龄为232.5±2.4Ma,可能指示嘎错玄武岩浆活动发生于中三叠世晚期,班公湖―怒江缝合带多玛枕状玄武岩、塔仁本玄武岩浆活动时代大约在早白垩世中晚期(110Ma左右);2在这些蛇绿混杂岩带中的玄武岩显示OIB而不是MORB型地球化学特征,双湖嘎错玄武岩的地球化学特征介于峨眉山高Ti玄武岩与夏威夷碱性玄武岩之间;中晚三叠世那曲嘎加组玄武岩的地球化学特征非常类似于夏威夷碱性玄武岩;班公湖―怒江缝合带内的早白垩世多玛玄武岩和塔仁本玄武岩的地球化学特征在很大程度上可比于夏威夷碱性玄武岩;3双湖嘎错OIB型玄武岩可能形成于以增生楔为基底的裂谷环境而不是以洋壳为基底的大洋板内环境,那曲嘎加组OIB型玄武岩很可能形成于以弧内―弧前沉积物为基底的陆棚―陆坡环境下的裂谷背景,塔仁本和多玛OIB型玄武岩形成于以洋壳为基底的洋岛环境,这表明班公湖―怒江洋壳在大约110Ma时尚未彻底消亡,可能暗示班公湖―怒江洋盆的关闭时间明显晚于晚侏罗世―早白垩世早期闭合的早期认识;4地球化学指标显示青藏高原中部中生代玄武岩未受到地壳物质或很少受到陆下岩石圈物质改造,一些相对新鲜样品的Nd,Pb组成似乎可以用来代表其地幔源区的成分特点,其高206Pb/204Pb比值(>18.5)指示羌塘双湖中晚三叠世嘎错玄武岩、班公湖―怒江缝合带早白垩世洋岛玄武岩所代表的中生代特提斯地幔很可能不具“Dupal”异常。然而,由于研究程度的限制和缺乏更多的可靠数据,这种观察还需要进一步确认。

References

[1]  鲍佩声,肖序常,王军,李才,胡克.1999.西藏中北部双湖地区蓝片岩带及其构造涵义.地质学报,73(4):302~315.
[2]  陈玉禄,张宽忠,李关清,尼玛次仁,赵守仁,陈国荣.2005.班公湖-怒江结合带中段上三叠统确哈拉群与下伏岩系角度不整合关系的发现及意义.地质通报,24(7):621~624.
[3]  董学斌,杨惠心,程立人,王忠民.1998.亚东-格尔木岩石圈地学断面综合研究:青藏高原地体构造的古地磁研究.中华人民共和国地质矿产部地质专报(五).北京:地质出版社,1~87.
[4]  李才,程立人,胡克.1995.西藏龙木错-双湖古特提斯缝合带研究.北京:地质出版社,1~31.?
[5]  李才,翟庆国,董永胜,黄小鹏.2006.青藏高原羌塘中部榴辉岩的发现及其意义.科学通报,51(1):70~74.
[6]  莫宣学,赵志丹,邓晋福,罗照华,喻学惠,郭铁鹰,周素,董国臣.2004.青藏高原中新生代火成岩的深部探针意义:若干新成果与新认识.见:陈运泰等主编,中国大陆地震学与地球内部物理学研究进展.北京:地震出版社,449~461.
[7]  潘桂棠,陈智梁,李兴振,颜仰基,许效松,徐强,江新胜,吴应林,罗建宁,朱同兴,彭勇民.1997.东特提斯地质构造形成演化.北京:地质出版社,1~218.
[8]  桑海清,王松山,裘冀.1996.冀东太平寨麻粒岩中的辉石,角闪石,斜长石的40Ar/39Ar年龄及其地质意义.岩石学报,2(3):390~400.
[9]  王希斌,鲍佩声,邓万明.1987.西藏蛇绿岩.北京:地质出版社,1~137.
[10]  王忠恒,王永胜,谢元和,孙忠纲,鲁宗林,曲永贵,李存直,姜雪飞.2005.西藏班公湖-怒江缝合带中段塔仁本洋岛型玄武岩的发现及地质意义,25(1~2):153~162.
[11]  肖序常,李廷栋.2000.青藏高原的构造演化与隆升机制.广州:广东科技出版社,239~268.
[12]  徐义刚.2002.地幔柱构造、大火成岩省及其地质效应.地学前缘,9(4):341-353.
[13]  张招崇,王福生.2003.峨眉山玄武岩Sr,Nd,Pb同位素特征及其物源探讨.地球科学:中国地质大学学报,28(4):431~439.
[14]  张招崇,王福生.2003.峨眉山玄武岩Sr,Nd,Pb同位素特征及其物源探讨.地球科学:中国地质大学学报,28(4):431~439.
[15]  Chen F,Siebel W,Satir M,Terzioglu N and Saka K.2002.Geochronology of the Karadere basement (NW Turkey) and implications for the geological evolution of the Istanbul zone.International Journal of Earth Sciences,91:469~481.
[16]  DupreB,Allegre C J.1983.Pb-Sr isotope variation in Indian Ocean basalts and mixing phenomena.Nature,303:142~146.
[17]  Floyd P A,Winchester J A.1975.Magma type and tectonic setting discrimination using immobile elements.Earth and Planetary Science Letters,27:211~218.
[18]  Hamelin B,DuprB,Allegre C J.1985/1986.Pb-Sr-Nd isotopic data of Indian Ocean ridges:new evidence for large-scale mapping of mantle heterogeneities.Earth and Planetary Science Letters,76:288~298.
[19]  Helo C,Hegner E,Kr?ner A,Badarch G,Tomurtogoo O,Windley B F,Dulski P.2006.Geochemical signature of Paleozoic accretionary complexes of the Central Asian Orogenic Belt in south Mongolia:constraints on arc environments and crustal growth.Chemical Geology,227:236~257.
[20]  Hess P C.1992.Phase equilibria constraints on the origin of ocean floor basalts.In:Morgan J P,Blackman D K,Sinton J M (eds.),Mantle Flow and Melt Generation at Mid-Ocean Ridges.Geophysical Monograph 71,American Geophysical Union,67~102.
[21]  Kent W,Saunders A D,Kempton P D,Ghose N C.2000.Rajmahal Basalts,eastern India:mantle sources and melt distribution at a volcanic rifted margin.In:Mahoney J J,Coffin M F (eds.),Large igneous provinces; continental,oceanic,and planetary flood volcanism,Washington D C,American Geophysical Union Monograph 100,145~182.
[22]  Rollinson H R.1993.Using geochemical data:evaluation,presentation,interpretation.Longman Group UK Ltd,New York,1~352.
[23]  Sun S S,McDough W F.1989.Chemical and isotope systematics of oceanic basalts:implications for mantle composition and processes.In:Saunders A D (eds.),Magmatism in ocean Basins.Geological Society Publication,42:313~345.
[24]  Xiao L,Xu Y G,Mei H J,Zheng Y F,He B,Franco Pirajno.2004.Distinct mantle sources of low-Ti and high-Ti basalts from the western Emeishan large igneous province,SW China:implications for plume-lithosphere interaction.Earth and Planetary Science Letters,228:525~546.
[25]  Xu J F,Castillo P R,Li X H,Yu X Y,Zhang B R,Han Y W.2002.MORB-type rocks from the Paleo-Tethyan Mian-Lueyang northern ophiolite in the Qinling Mountains,central China:implications for the source of the low 206Pb/204P and high 143Nd/144N mantle component in the Indian Ocean.Earth and Planetary Science Letters,198:323~337.
[26]  Xu J F,Castillo P R.2004.Geochemical and Nd-Pb isotopic characteristics of the Tethyan asthenosphere:implications for the origin of the Indian Ocean mantle domain.Tectonophysics,393:9~27.
[27]  Zhang S Q,Mahoney J J,Mo X X,Ghazi A M,Milani L,Crawford A J,Guo T Y,Zhao Z D.2005.Evidence for a Widespread Tethyan Upper Mantle with Indian Ocean Type Isotopic Characteristics.Journal of Petrology,46:829~858.
[28]  尼玛次仁,谢尧武,沙昭礼,西洛朗杰,强巴扎西,彭道平,格桑索朗,洛松占堆.2004.中华人民共和国1:25万区域地质调查报告那曲县幅.
[29]  http://georoc.mpch-mainz.gwdg.de/georoc/Entry.html
[30]  常承法,郑锡澜.1973.中国西藏南部珠穆朗玛地区地质构造特征及其青藏高原东西向诸山系形成的探讨.中国科学(D辑),2:190~201.
[31]  陈文,刘新宇,张思红.2002.连续激光阶段升温40Ar/39Ar地质年代测定方法研究.地质论评,48(增刊):127~134.
[32]  邓万明,尹集祥,呙中平.1996.羌塘茶布-双湖地区基性超基性岩火山岩研究.中国科学 (D辑),26(4):296~301.
[33]  赖绍聪.2003.青藏高原新生代埃达克质岩的厘定及其意义.地学前缘,10(4):407~415.
[34]  李才,翟庆国,程立人,徐峰,黄小鹏.2005.青藏高原羌塘地区几个关键地质问题的思考.地质通报,24(4):295~301.
[35]  李曙光.1993.蛇绿岩生成构造环境的Ba-Th-Nb-La判别图.岩石学报,9(2):146~157.
[36]  李志昌,路远发,黄圭成.2004.放射性同位素地质学方法与进展.武汉:中国地质大学出版社,1~276.
[37]  刘颖,刘海臣,李献华.1996.用ICP-MS准确测定岩石样品中的40余种微量元素.地球化学,25(6):552~558.
[38]  潘桂棠,莫宣学,侯增谦,朱弟成,王立全,李光明,赵志丹,耿全如,廖忠礼.2006.冈底斯造山带的时空结构及演化.岩石学报,22(3):521~533.
[39]  潘桂棠,郑海祥,徐耀荣.1983.初论班公湖-怒江结合带.见:青藏高原地质文集(12).北京:地质出版社,229~242.
[40]  宋彪,张玉海,万渝生,简平.2002.锆石SHRIMP样品靶制作,年龄测定及有关现象讨论.地质论评,2002,48(增刊):26~30.
[41]  西藏自治区地质矿产局.1993.西藏自治区区域地质志.北京:地质出版社,1~450.
[42]  翟庆国,李才,程立人,张以春.2004.西藏羌塘角木日地区二叠纪蛇绿岩的地质特征及构造意义.地质通报,23(12):1228~1230.
[43]  朱弟成,潘桂棠,莫宣学,王立全,廖忠礼,赵志丹,董国臣,周长勇.冈底斯中北部晚侏罗世-早白垩世地球动力学环境:火山岩约束.岩石学报,22(3):534~546.
[44]  Dosso L,Bougault H,Beuzart P,Calvez J Y,Joron J J.1988.The geochemical structure of the South-East Indian Ridge.Earth and Planetary Science Letters,88:47~59.
[45]  Frey F A,Green D H,Roy S D.1978.Integrated models of basalt petrogenesis:a study of quartz tholeiites to olivine melilitites from South Eastern Australia utilizing geochemical and experimental petrological data.Journal of Petrology,19:463~513.
[46]  Hoskin P W O,Black L P.2000.Metamorphic zircon formation by solid-state recrystallization of protolith igneous zircon.Journal of Metamorphic Geology,18:423~439.
[47]  Hou Z Q,Gao Y F,Qu X M,Rui Z Y,Mo X X.2004.Origin of adakitic intrusives generated during mid-Miocene east-west extension in southern Tibet.Earth and Planetary Science Letters,220(1~2):139~155.
[48]  Li XH,Li Z X,Zhou HW,Liu Y,Kinny P D.2002.U-Pb zircon geochronology,geochemistry and Nd isotopic study of Neoproterozoic bimodal volcanic rocks in the Kangdian Rift of South China:implications for the initial rifting of Rodinia.Precambrian Research,113:135~154.
[49]  Mahoney J J,Frei R,Tejada M L G,Mo X X,Leat P T,N?gler T F.1998.Tracing the Indian Ocean mantle domain through time:isotope results from old West Indian,East Tethyan,and South Pacific seafloor.Journal of Petrology,39:1285~1306.
[50]  Meschede M.1986,A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with the Nb-Zr-Y diagram.Chemical Geology,56:207~218.
[51]  Neal C R,Mahoney J J,Chazey W J.2002.Mantle sources and the highly variable role of continental lithosphere in basalt petrogenesis of the Kerguelen Plateau and Broken Ridge LIP:results from ODP Leg 183.Journal of Petrology,43:1177~1205.
[52]  Pearce J A,Cann J R.1973.Tectonic setting of basic volcanic rocks determined using trace element analyses.Earth and Planetary Science Letters,19:290~300.
[53]  Rudnick R L,Gao S.2003.The Composition of the Continental Crust,1~64.In:The Crust (ed.Rudnick R L.) Vol.3,Treatise on Geochemistry (eds.Holland H D,Turekian K K),Elsevier-Pergamon,Oxford.
[54]  Winchester J A,Floyd P A.1977.Geochemical discrimination of different magma series and their differentiation products using immobile elements.Chemical Geology,20:325~342.
[55]  Xu Y G,Chung S L,Jahn B M,Wu G Y.2001.Petrologic and geochemical constraints on the petrogenesis of Permian-Triassic Emeishan flood basalts in southwestern China.Lithos,58:145~168.
[56]  Yin A,Harrison T M.2000.Geologic Evolution of the Himalayan-ibetan orogen.Annual Review of Earth and Planetary Sciences,28:211~280.
[57]  Yogodzinski G M,Naumann T R,Smith E I,Bradshaw T K,Walker J D.1996.Evolution of a mafic volcanic field in the central Great Basin,south-central Nevada.Journal of Geophysical Research,101:17425~17445.
[58]  Zhu D C,Pan G T,Mo X X,Liao Z L,Jiang X S,Wang L Q,Zhao Z D.in press.Petrogenesis of volcanic rocks in the Sangxiu Formation,central segment of Tethyan Himalaya:A probable example of plume lithosphere interaction.Journal of Asian Earth Sciences.
[59]  http://georoc.mpch-mainz.gwdg.de/georoc/Entry.html.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133