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  2003 

滇川西部金沙江石炭纪蛇绿岩SHRIMP测年:古特提斯洋壳演化的同位素年代学制约

, PP. 217-228

Keywords: 金沙江,蛇绿岩,SHRIMP测年,锆石

Full-Text   Cite this paper   Add to My Lib

Abstract:

本文应用SHRIMP方法精确测定了金沙江蛇绿岩带中蛇绿岩的辉长岩和斜长岩、呈脉状产于辉长岩和变质橄橄岩中的斜长花岗岩、以及呈岩株状侵入蛇绿岩中的花岗闪长岩的锆石U-Pb年龄,提供了古特提斯洋壳演化的年代学制约。滇西之用层状角闪辉长岩的年龄为328±8Ma,书松斜长岩为329±7Ma,白马雪山辉长岩为282~285Ma,它们可能反映了海底扩张不同阶段的时代。研究还表明,在这些辉长岩和斜长岩中,部分锆石记录了375~352Ma的略老的年龄,暗示蛇绿岩浆活动可能始于晚泥盆世。在金沙江蛇绿岩中,滇西娘九丁斜长花岗岩和川西雪堆斜长花岗岩,具有高硅低钾的成分特征。但是,这些岩石的REE总量高,LREE富集;Sr初始值高,达0.7058~0.7070;在其锆石组成中,存在继承锆石。这些证据表明斜长花岗岩中存在陆壳物质的混染,可能与洋壳俯冲消减有关。娘九丁斜长花岗岩的年龄为285±6Ma,雪堆斜长花岗岩为300±5Ma,记录了古特提斯洋壳俯冲消减事件。滇西吉义独花岗闪长岩,呈岩株状侵入蛇绿岩中,年龄为263±6Ma,限定了蛇绿混杂岩的年代上限。

References

[1]  黄汲清,陈国铭,陈炳蔚.1984.特提斯喜马拉雅构造域初步分析.地质学报,58(1):1~17.
[2]  简平,汪啸风,何龙清,王传尚.1999.金沙江蛇绿岩中斜长岩和斜长花岗岩的U-Pb年龄及地质意义.岩石学报,15(4):590~593.
[3]  莫宣学,沈上越,朱勤文,等.1998.三江中南段火山岩-蛇绿岩与成矿.北京:地质出版社,86~107.
[4]  孙晓猛,聂泽同,梁定益.1995.滇西北金沙江带硅质岩沉积环境的确定及大地构造意义.地质论评,41(2):174~178.
[5]  钟大赉.1998.滇川西部古特提斯造山带.北京:科学出版社,1~231.
[6]  Compston W, Williams I S, Kirschvink J L, et al. 1992. Zircon U-Pb ages of early Cambrian time-scale. J. Geol. Soc. , 149: 171~184.
[7]  Flagler P A, Spay G. 1991. Generation of plagiogranite by amphibolite anatexis in oceanic shear zones. Geology, 19(1): 70~73.
[8]  Jian P, Wang X, He L, Wang C. 1999. U-Pb dating of anothosite and plagiogranite from the Jinshajiang ophiolite belt. Acta Petrologica Sinica, 15(4):590~ 593 (in Chinese with English abstract).
[9]  Ludwig K R. 2001. Squid 1. 02: A user manual. Berkeley Geochronological Center Special Publication 2:19.
[10]  Mo X, Sheng, S, Zhu Q, et al. 1998. Volcanics ophiolite and mineralization of middle-southern part in Sanjiang area of Southwestrn China. Beijing: Geological Publishing House, 86~107 (in Chinese with English abstract).
[11]  Sun X, Zhang B, Nie Z. 1997. Formation age and environment of ophiolote and ophiolitic me1ange in the Jinshajiang belt,Northwestern Yunnan. Geological Review, 43(2): 113~120(in Chinese with English abstract).
[12]  Whitehead J,Spray J G,Dunning G R. 2000. U-Pb geochronology and origin of granitoid rocks in Thetford Mine ophiolite, Cannadian Appalachins. Geological Society of America Bulletin, 112 (6):915~928.
[13]  Wu H. 1993. Discovery of Early Carboniferous deep-sea sediments from Jinsha Belt, NW Yunnan. Scientia Geologica Sinica, 28(4):395 ~ 397 (in Chinese with English abstrct).
[14]  Zhang Q. Zhang K, Li D. 1992. Mafic-Ultramafic rocks in Hengduan Mountains region. Beijing: Science Press, 9 ~ 130 (in Chinese with English abstract).
[15]  Zhong D. 1998. The Paleo-Tethyan orogenic belts, western Yunnan and Sichun Provinces. Beijing: Science Press: 1 ~ 231 (in Chinese).
[16]  韩松,贾秀勤,黄忠祥,董金泉,张旗,陈雨,李秀云.1996.云南金沙江蛇绿岩的地球化学特征及其成因的初步研究.岩石矿物学杂志,15(3):204~212.
[17]  莫宣学,路风香,沈上越,等.1993.三江特提斯火山作用与成矿.北京:地质出版社,11~18.
[18]  潘桂棠,陈智梁,李兴振,等.1997.东特提斯地质构造形成演化.北京:地质出版社,24~65.
[19]  吴浩若.1993.滇西北金沙江带早石炭世深海沉积的发现.地质科学,28(4):395~97.
[20]  张旗,张魁武,李达周.1992.横断山区镁铁-超镁铁质岩.北京:科学出版社,9~130.
[21]  Coleman R G, Peterman Z E. 1975. Oceanic plagiogranite. J. Geophs.Res. , 80:1099~1108.
[22]  Gerlach D C, Leeman W P et al. 1981. Petrology and Geochemistry of plagiogranite in the Canyon Mountain Ophiolite, Oregon.Contrib. Mineral Petrol. , 77:82~ 92.
[23]  Huang J, Chen G, Chen B. 1984. Preliminary analysis of the TethysHimalayan tectonic domain. Acta Geologica Sinica, 58:1~17(in Chinese with English abstract).
[24]  Han S, Jia X, Huang Z, et al. 1996. A preliminary geochemical and genetic study of Jinsha River ophiolites, Yunnan Province. Acta Petrologica et Mineralogica, 15 (3): 204~ 212 (in Chinese with English abstract).
[25]  Ludwig K R. 1999. Using Isoplot/EX, version 2, a geolocronolgical Toolkit for Microsoft Excel. Berkeley Geochronological Center Special Publication la, 47.
[26]  Metcalf I. 1996. Gondwanaland dispersion, Aisia accretion and evolution of eastern Tethys. Australia Journal of Earth ciences,43:605~623.
[27]  Mo X, Lu F, Sheng S, et.al. 1993. Sanjiang Tethyan volcanism and related mineralization. Beijing: Geological Publishing House, 11~18(in Chinese with English abstract).
[28]  Nutman A P, Green D H, Cook C A, et al. 2001. SHRIMP U-Pb zircon dating of the exhumation of the Lizard peridotite and its emplacement over crustal rocks: constraints for tectonic models.Journal of the Geological Society, London. 158:809~820.
[29]  Pan G, Chen Z, Li Xi et al. 1997. Geological-tectonic evolution in the eastern Tethy. Beijing: Geological Publishing House, 24~ 65 (in Chinese with English abstract).
[30]  Wang X, Metcalf I, Jian P. 2000. The Jinshajiang Suture Zone,China: tectonosratigraphy, age andevolution. Journal of Asia Earth Sciences, 18: 675 ~ 690.
[31]  Williams I S, Claesson S. 1987. Isotope evidence for the Precambrian province and Caledonian metamorphism of high grade paragneiss from the Seve Nappes, Scandinavian Caledonides, Ⅱ. Ion microprobe zircon U-Th-Pb. Contrib. Mineral. Petrol. ,97:205 ~217.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133