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...
地质通报  2004 

西昆仑山中元古代长城系火山岩地球化学

, PP. 130-135

Keywords: 西昆仑山,长城系火山岩,地球化学

Full-Text   Cite this paper   Add to My Lib

Abstract:

西昆仑山长城系塞拉加兹塔格群为一套火山-沉积岩组合,其火山岩主体为基性岩,在顶部出现少量酸性富Na的流纹英安岩。基性火山岩SiO2=47.77%~49.56%,Na2OK2O=4.64%~5.42%,Na2O/K2O=2.32~8.46,ΣREE=74.29×10-6~137.35×10-6La/YbN=6.5~10.0La/SmN=2.35~2.91微量元素经N-MORB标准化后的配分模式与板内碱性-拉斑玄武岩的相近多种不相容元素HFSE比值及相应的图解表明玄武岩形成于大陆板内裂解背景。酸性火山岩SiO2=70.01%~72.72%Na2OK2O=7.83%~8.27%ΣREE=402.97×10-6~826.55×10-6,(La/Yb)N=11.58~30.68,(La/Sm)N=5.1~10.5,δEu为0.31~0.32,稀土配分模式具有A型花岗岩特征。火山岩的沉积学、地球化学特征综合分析显示火山岩形成于大陆裂解背景。

References

[1]  姜春发.昆仑开合构造[M].北京:地质出版社,1992.47~68.
[2]  中国科学院青藏高原综合科学考察队(潘裕生主编).喀喇昆仑山-昆仑山地区地质演化[M].北京:科学出版社,2000.22~147.
[3]  丁道贵,王道轩,刘伟新,等西昆仑造山带与盆地[M].北京:地质出版社,1996.72~105.
[4]  肖序常,王军.青藏高原构造演化及隆升的简要评述[J].地质论评,1998,44(4):372~381.
[5]  任纪舜,王作勋,陈炳蔚,等.从全球看中国大地构造(中国及邻区大地构造图)[M].北京:地质出版社,1999.1~15.
[6]  郭坤一,张传林,赵宇,等.西昆仑东段北缘中元古代岛弧火山岩地球化学特征[J].中国地质,2000,29(2):161~165.
[7]  Winchester J A, Floyd P A. Geochemical discrimination of different magma series and their differentiation products using immobile elements[J]. Chemical Geology, 1977,20(3):325~343.
[8]  王焰,钱青,刘良,等.不同构造环境中双峰式火山岩的主要特征[J].岩石学报,2000,16(2):169~173.
[9]  Boynton W V. Cosmochemistry of the rare earth elements [J].Meteorite studies Dev, Geochem., 1984,2:63~114.
[10]  李献华,胡瑞忠,饶冰.粤北白垩纪基性岩脉的年代学和地球化学[J].地球化学,1997,26:14~28.
[11]  Galer S J G, et al. Limits on chemical and convective isolation in the Earth\'s interior[J]. Chem. Geol., 1989,75:257~290.
[12]  Shevais J W. Ti-V plots and the petrogenesis of modern and opholitic lavas[J]. Earth Planet Sci. Lett., 1982 , 59 :101~118.
[13]  Hoffman A W. Nd and Pb in oceanic basalts: new constrains on mantle evolution[J]. Earth Planet Sci. Lett., 1986,79:33~45.
[14]  Weaver B L. The origin of ocean island basalt end-member composition: trace element and isotopic constraints [J]. Earth Planet Sci. Lett., 1991,104:381~397.
[15]  Hart S R, Hauri E H, Oschmann L A, et al. Mande plume and entrainment:isotopic evidence [J]. Science, 1992,256:517~520.
[16]  Hawkesworth C J, Rogers N, van Calstern P, et al. Mantle enrichment processes[J]. Nature, 1984,311:331~335.
[17]  Meschede M. A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with Nb-Zr-Y diagram[J]. Chem. Geol. ,1986 , 56 : 207~218.
[18]  Pearce J A, Cann J R. Tectonic setting of basic volcanic rocks determined using trace element analysis [J]. Earth Planet Sci.Lett., 1973,12:290~300.
[19]  张传林,赵宇,郭坤一.塔里木西南蓟县系双峰式火山岩中基性岩地球化学特征[J].地球科学,2003,28(1):47~53.
[20]  Zhang Chuanlin, Dong Yongguan, Zhao Yu, et al. Geochemistry of Meso-Proterozoic volcanites in Western Kunlun:evidence for the plate tectonic evolution[J]. Acta Geologica Sinica, 2003,77 (2): 237~245.
[21]  新疆地质矿产局.新疆维吾尔自治区区域地质志[M].北京:地质出版社,1993.22~31.
[22]  Hyndman D W. Petrology of igneous and metamorphic rocks[M]. McGraw-Hill, New York, 1985.135~141.
[23]  Pearce J A, Harris N B W, Tindle A G. Trace elements discrimination diagrams for the tectonic interpretation of granitic rocks[J]. J. Petrol., 1984,25(4):956~983.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133