帮助 关于我们

返回检索结果

西藏措勤地区则弄群火山岩源区------地球化学及Sr-Nd同位素制约
Volcanic rock provenance of Zenong Group in Coqen area of Tibet: geochemistry and Sr-Nd isotopic constraint

查看参考文献35篇

刘伟 1   李奋其 1   袁四化 1   张万平 1   卓皆文 1   王保弟 2   唐文清 1  
文摘 西藏中冈底斯带出露大面积早白垩世则弄群火山岩. 措勤地区则弄群火山岩具有较高的SiO_2含量(61.91% ~74.28%),轻稀土元素相对富集,富集大离子亲石元素Rb、Ba、Th、U,亏损高场强元素Nb、Ta等,并具Sr负异常,同时具有高的初始Sr同位素(0.707 89~0.710 17)和低的Nd的同位素(-3.4~-9.3)特征,与壳源岩浆的地球化学特征类似. 在εNd(t)-(~(87)Sr/~(86)Sr)i图解上,措勤地区则弄群火山岩所有样品均投于第四象限,而且都分布在上地壳与雅鲁藏布江MORB型亏损地幔混合线附近. 微量元素构造环境判别图解显示,则弄群火山岩形成于岛弧环境. 综合已有研究成果以及最新1:25万区域地质调查资料,认为措勤地区则弄群长英质火山岩很可能是幔源基性岩浆的热量促使地壳物质脱水发生重熔的产物,其形成的大地构造背景很可能与班公湖-怒江特提斯洋南向的俯冲作用有关
其他语种文摘 Magmatic rocks of Early Cretaceous Zenong Group are extensively developed in the Gangdise belt o Tibet, and the genesis of these rocks has given rise to much controversy. In view of this, the authors sample and analyzed systematically felsic volcanic rocks of Zenong Group in Coqen area of Gangdise orogenic belt. Th results show that magmatic rocks of Zenong Group are characterized by high SiO_2content, relative enrichment o LREE and evident enrichment of LILE, Rb, Ba, Th and U, depletion of suchHFS elements as Nb and Ta, an the appearance of Sr negative anomalies, with isotopic features of high Sr (0.707 89~0.710 17) and low N (-3.4~-9.3). They are aluminum-oversaturated (A/CNK=1.09~1.17) and geochemically similar to th crustal magma. In the diagram of ε Nd(t)-(~(87)Sr/~(86)Sr)i, all the samples fall in the No.4 quadrant and are distributed around the mixture line of the upper crust and the Yarlung Zangbo River MORB-type depleted crust suggesting the existence of fairly abundant upper crust matters and the participation of small amounts of mant materials. Moreover, magmatic rocks of Zenong Group are extensively distributed almost in the whole region The diagram of La/Sm-La indicates that the felsic magmatic rocks of Zenong Group are probably different parti melting products from the same magma source. The felsic magmatic rocks are greatly enriched in LREE an have a spidergram very similar to that of the upper continental crust. The tectonic-setting discrimination diagra of trace elements implies that magmatic rocks of Zenong Group were formed in a island-arc tectonic setting Based on previous research results and the latest 1:250 000 regional geological survey, the authors hold that th felsic magmatic rocks of Zenong Group might be products of the dehydration and remelting of the crustal mater als caused mainly by the heat of the mantle basic magma with the participation of some mantle materials. Th tectonic setting of the magmatic rocks of Zenong Group was probably associated with the southward subductio of the Bangong Lake-Nujiang River Tethys oceanic crust
来源 岩石矿物学杂志 ,2010,29(4):367-376 【核心库】
关键词 地球化学 ; Sr-Nd同位素 ; 岩石成因 ; 措勤则弄群火山岩 ; 冈底斯带
地址

1. 中国地质调查局成都地质调查中心, 四川, 成都, 610081  

2. 中国地质调查局成都地质调查中心, 中国科学院广州地球化学研究所同位素年代学和地球化学实验室, 四川, 成都, 610081

语种 中文
文献类型 研究性论文
ISSN 1000-6524
学科 地质学
基金 国土资源大调查资助项目"雅鲁藏布江成矿带基础地质综合研究
文献收藏号 CSCD:3908774

参考文献 共 35 共2页

1.  Bacon C R. Compositional evolution of the zoned calcalkaline magma chamber of mount Mazama, crater Lake , Oregon. Contribution to Mineralogy and Petrology,1988,98:224-256 被引 66    
2.  常承法. 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),1973,2:190-201 被引 20    
3.  Chen F K. Zircon ages, Nd isotopic and chemical composition of orthogneisses from the Black Forest , Germany: Evidence for a Cambrian magmatic arc. Earth Science,2000,88:791-802 被引 2    
4.  Chen F K. Geochronology of the Karadere basement(NW Turkey) and implications for the geological evolution of the Istanbul zone. Earth Science,2002,91:469-481 被引 2    
5.  Coulon C. Mesozoic and Cenozoic volcanic rocks from central and southern Tibet:39Ar/40Ar dating, petrological characteristics and geodynamical significance. Earth and Planetary Science Letters,1986,79:281-302 被引 235    
6.  Harris N B W. Cretaceous plutonism in central Tibet:An example of post-collision magmatism?. Journal of volcanology and Geothermal Research,1990,44:21-32 被引 47    
7.  和钟铧. 西藏冈底斯带门巴地区印支期花岗岩地球化学特征及其构造意义. 地质通报,2005,24(4):354-359 被引 27    
8.  和钟铧. 冈底斯带门巴花岗岩同位素测年及其对新特提斯洋俯冲时代的约束. 地质评论,2006,52(1):100-106 被引 65    
9.  Ingle S. Indian Continental Crust Recovered from Elan Bank,Kerguelen Plateau(ODP Leg 183,Site 1 137). Journal of Petrology,2002,43:1241-1257 被引 35    
10.  康志强. 拉萨地块中北部白垩纪则弄群火山岩:Slainajap洋南向俯冲的产物?. 岩石学报,2008,24(2):303-314 被引 63    
11.  李才. 冈底斯地区发现印支期巨斑花岗闪长岩--古冈底斯造山的存在证据. 地质通报,2003,22(5):364-366 被引 85    
12.  Mahoney J. Tracing the Indian ocean mantle domain through time: isotopic results from old west Indian, east Tethyan, and south Pacific seafloor. J. Petrol,1998,39(7):1285-1306 被引 63    
13.  Miller C. Post-collisional potassic and ultrapotassic magmatism in SWTibet; geochemical and Sr-Nd-Pb-O isotopic constraints for mantle source characteristics and petrogenesis. Journal of Petrology,1999,40(9):1399-1424 被引 309    
14.  莫宣学. 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. 中国大陆地震学与地球内部物理学研究进展,2004:449-461 被引 12    
15.  莫宣学. 西藏冈底斯带花岗岩的时空分布特征及地壳生长演化信息. 高校地质学报,2005,11(3):281-290 被引 327    
16.  潘桂棠. 青藏高原及邻区地质图说明书,2004:1-133 被引 10    
17.  潘桂棠. 冈底斯造山带的时空结构及演化. 岩石学报,2006,22(3):521-533 被引 516    
18.  Pearce J A. Volcanic rocks of the 1985 Tibet Geotraverse Lhasa to Golmud. Royal Society of London Philosophical Transactions,Series A,1988,327:169-201 被引 30    
19.  Roberts M P. Origin of high-potassium,calcalkaline,I-type granitoids. Geology,1993,21:825-828 被引 194    
20.  Guffanti M. Thermal and mass implications of magmatic evolution in the Lassen volcanic region,California,and constraints on basalt influx to the lower crust. Journal of Geophysical Research,1996,101:3001-3013 被引 45    
引证文献 24

1 马国林 西藏拉萨地块北部白垩纪火山岩及其对冈底斯岛弧构造演化的制约 岩石矿物学杂志,2010,29(5):525-538
被引 30

2 余红霞 拉萨地块中北部晚白垩世(约90Ma)拔拉扎含矿斑岩地球化学特征及其成因 岩石学报,2011,27(7):2011-2022
被引 32

显示所有24篇文献

论文科学数据集

1. 东北松辽盆地早白垩世火山岩锆石年龄和地球化学组成数据

2. 福建紫金山岩石学数据(~105 Ma)

3. 福建闽西南大坪花岗斑岩的地球化学数据

数据来源:
国家青藏高原科学数据中心
PlumX Metrics
相关文献

 作者相关
 关键词相关
 参考文献相关

版权所有 ©2008 中国科学院文献情报中心 制作维护:中国科学院文献情报中心
地址:北京中关村北四环西路33号 邮政编码:100190 联系电话:(010)82627496 E-mail:cscd@mail.las.ac.cn 京ICP备05002861号-4 | 京公网安备11010802043238号