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 

西藏拉萨地块高镁超钾质火山岩及对南北向裂谷形成时间和切割深度的制约

, PP. 1252-1261

Keywords: 西藏拉萨地块,高镁超钾质火山岩,南北向裂谷,形成时间,切割深度

Full-Text   Cite this paper   Add to My Lib

Abstract:

青藏高原拉萨地块南北向裂谷中发育少量中新世高镁超钾质火山岩,岩石具有较高的SiO2含量(53%~50%),同时具有极高的K2O(7%~6%)、MgO(11%~8%)、Cr(500×10-6~400×10-6)、Ni(400×10-6~260×10-6)含量,较高的放射性成因87Sr/86Sr(0.7265~0.7199)、非放射性成因143Nd/144Nd(0.511844~0.511769)比值,δ18OVSMOW值较高,变化范围很大(10.4‰~6.4‰),其源区为加入了大量俯冲印度地壳的富集地幔。40Ar/39Ar同位素年龄指示他们喷发时代为17~13Ma。结合正断层与火山岩的切割与覆盖关系,指出高原正断层强烈活动时间为23~13Ma,持续了~10Ma,伸展速率为5.6±3.0mm/a。高镁超钾质火山岩与裂谷在时间上的一致和空间上的重合,指示高镁超钾质火山岩与裂谷的形成演化密切相关,高原裂谷系统的建立是由于俯冲印度地壳的断离造成的高原岩石圈的伸展破裂,其活动时期分为2个阶段,首先伴随高原隆升(23~13Ma),随后在重力作用下,促使高原垮塌(13Ma~现在)。

References

[1]  莫宣学,赵志丹,邓晋福,董国臣,周肃,郭铁鹰,张双全,王亮亮.2003.印度-亚洲大陆主碰撞过程的火山作用相应.地学前缘,10(3):135~148.
[2]  Armijo R,Tapponnier P,Tonglin H.1989.Late Cenozoic right-lateral strike-slip faulting in southern Tibet:Journal of Geophysical Research,94:2787~2838.
[3]  Boynton W V.1984.Cosmochemistry of the rare earth elements:meteorite studies.In:Henderson P.(ed.) Rare Earth Element Geochemistry.Amsterdam:Elsevier:63~114.
[4]  Chung S L,D Liu,J Ji,M F Chu,H Y Lee,D J Wen,C H Lo,T Y Lee,Q Qian,Q Zhang.2003.Adakites from continental collision zones:Melting of thickened lower crust beneath southern Tibet.Geology,31:1021~1024.
[5]  Coleman M E,Hodges K V.1995.Evidence for Tibetan plateau uplift before 14 a ago from a new minimum age for east-west extension:Nature,374:49~52.
[6]  Coulon C,H Maluski,C Bollinger,S Wang.1986.Mesozoic and Cenozoic volcanic rocks from central and southern Tibet:39Ar-40Ar dating,petrological characteristics and geodynamical significance.Earth and Planetary Science Letters,79:281~302.
[7]  England P,G Houseman.1989.Extension during continental convergence,with application to the Tibetan plateau.Journal of Geophysical Research,94:17,561~17,579.
[8]  Harrison T M,Copeland P,Kidd W S F,Yin A.1992.Raising Tibet:Science.255:1663~1670.
[9]  Irvine I.1977.A guide to the chemical classification of common volcanic rocks.Can J.Earth Sci.,8:532 ~ 548.
[10]  Kapp P,J H Guynn.2004.Indian punch rifts Tibet.Geology,32:993~996.
[11]  Liao S P,Z H Chen,X C Luo,A J Zhou.2002.Discovery of leucite phonolite in the Tangra Yumco area,Tibet and its geological signicance.Geological Bulletin of China,21:735~738.
[12]  Miller C,Schuster R,Klotzli U,Frank W,Purtscheller F.1999.Post-collision potassic and ultrapotassic magmatism in SW Tibet:geochemical and Sr-Nd-Pb-O isotopic constraints for mantle source characteristics and petrogenesis.Journal of Petrology,40:1399~1424.
[13]  Molnar P,Tapponnier P.1975.Cenozoic tectonics of Asia:effects of a continental collision.Science,183:419~426.
[14]  Molnar P,Tapponnier.1978.Active tectonics of Tibet.Journal of Geophysical Research,83:5361~5375.
[15]  Molnar P,W P Chen.1983.Focal depths and fault plane solutions of earthquakes under the Tibetan plateau.Journal of Geophysical Research,88:1180~1196.
[16]  Molnar P,P England,J Martinod.1993.Mantle dynamics,uplift of the Tibetan Plateau,and the India monsoon.Reviews of Geophysics,31:357~396.
[17]  Nomade S,P R Renne,X Mo,Z Zhao,S Zhou.2004.Miocene volcanism in the Lhasa block,Tibet:spatial trends and geodynamic implications.Earth and Planetary Science Letters 221:227~243.
[18]  Sun S S,McDonough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and process.In:Saunders A.D.& Norry M.J.(eds.).Magmatism in the Ocean Basins.Geological Society,London,Special Publications 42:313~345.
[19]  Turner S,C Hawkesworth,J Liu,N Rogers,S Kelley,P Calsteren.1993.Timing of Tibetan uplift constrained by analysis of volcanic rocks.Nature,364:50~54.
[20]  Turner S,N Arnaud,J Liu,N Rogers,C Hawkesworth,N Harris,S Kelley,P Van Calsteren,W Deng.1996.Post-collision,shoshonitic volcanism on the Tibetan plateau:Implications for convective thinning of the lithosphere and the source of ocean island basalts.Journal of Petrology,37:45~71.
[21]  Widdowson N B,A B Herman,S Guo,P J Valdes,J A Wolfe,S P Kelley.2003.Constant elevation of southern Tibet over the past 15 million years.Nature.421(6923):622~624.
[22]  Williams H,Turner S,Kelley S,Harris N.2001.Age and composition of dikes in southern Tibet:New constraints on the timing of east-west extension and its relationship to postcollisional volcanism.Geology,29:339~342.
[23]  Yin A,T M Harrison.2000.Geologic Evolution of the Himalayan-Tibetan Orogen.Annual Reviews of Earth and Planetary Science,28:211~280.
[24]  江元生,周幼云,王明光,谢云喜,李建兵,彭波.2003.西藏冈底斯山中段第四纪火山岩特征及地质意义.地质通报,22:16~20.
[25]  廖思平,陈振华,罗小川,邹爱建.2002.西藏当惹雍错地区白榴石响岩的发现及地质意义.地质通报,21:735~738.
[26]  张进江,丁林,钟大赉,周勇.1999.喜玛拉雅平行于造山带伸展--是垮塌的标志还是挤压隆升过程的产物?科学通报,44:2031~2036.
[27]  Armijo R,Tapponnier P,Mercier J L,Han T L.1986.Quaternary extension in southern Tibet:Field observations and tectonic implications:Journal of Geophysical Research,91:13803~13872.
[28]  Blisniuk P M,Hacker B R,Glodny J,Ratschbacher L,Bi S,Wu Z,McWilliams M O,Calvert A.2001.Normal faulting in central Tibet since at least 13.5 Ma ago.Nature,412:628~632.
[29]  Carmala N G,Dettman D L,Quade J,DeCelle P G,Butler R F.2000.High times on the Tibetan Plateau:Paleoelevation of the Thakkhola graben,Nepal.Geology,28:339~342.
[30]  Chung S L,M F Chu,Y Zhang,Y Xie,C H Lo,T Y Lee,C Y Lan,X Li,Q Zhang,Y Wang.2005.Tibetan tectonic evolution inferred from spatial and temporal variations in post-collisional magmatism,Earth-Science Reviews 68:173~196.
[31]  Cogan M J,K D Nelson,W S F Kidd,C Wu,project INDEPTH.1998.Shallow structure of the Yadong-Gulu rift,southern Tibet,from refraction analysis of project INDEPTH commom midpoint data.Tectonics,17:46~61.
[32]  Ding L,P Kapp,D Zhong,W Deng.2003.Cenozoic volcanism in Tibet:evidence for a transition from oceanic to continental subduction.Journal of Petrology,44:1833~1865.
[33]  Foley S F,G Venturelli,D H Green,L Toscani.1987.The ultrapotassic rocks:characteristics classification,and constraints for petrogenetic models.Earth-Science Review,24:81~134.
[34]  Hou Z Q,Y F Gao,X M Qu,Z Y Rui,X X Mo.2004.Origin of adakitic intrusives generated during mid-Miocene east-west extension in southern Tibet.Earth and Planetary Science Letters,220:139~155.
[35]  Le Bas M J,R W Le Maitre,A Streckeisen,B Zanettin.1986.A chemical classification of volcanic rocks based on the total alkali-silica diagram.Journal of Petrology,27:745~750.
[36]  Mercier J L,R Armijo,P Tapponnier,E Carey-Gailhardis,T L Han.1987.Change from Late Tertiary compression to Quaternary extension in southern Tibet during the India-Asia collision.Tectonics,6:275~304.
[37]  Mo X,Zhao Z,Deng J,Dong G,Zhou S,Guo T,Zhang S,Wang L.2003.Response of volcanism to the India-Asia collision.Earth Science Frontiers (China University of Geosciences,Beijing),10:135~148 (in Chinese with English abstract).
[38]  Rowley D B,B S Currie.2006.Palaeo-altimetry of the late Eocene to Miocene Lunpola basin,central Tibet.Nature,439:677~681.
[39]  Seeber L,Armbruster J G.1984.Some elements of continental subduction along the Himalayan front.Tectonophysics,105:263~278.
[40]  Tapponnier P,Z Xu,F Roger,B Meyer,N Arnaud,G Wittlinger,J Yang.2001.Oblique stepwise rise and growth of the Tibet Plateau.Science,294:1671~1677.
[41]  Valley J W,P D Kinny,D J Schulze,M J Spicuzza.1998.Zircon megacrysts from kimberlite:oxygen isotope variability among mantle melts.Contrib Mineral Petrol,133:1~11.
[42]  Zhang J J,L Ding,D L Zhong,Y Zhou.2000.Orogen-parallel extension in Himalaya:Is it the indicator of collapse or the product in process of compressiveuplift? Chinese Science Bulletin,45:114~120.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133