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...
地质论评  2002 

北京密云沙厂环斑花岗岩杂岩体黑钨矿钐―钕同位素研究

Keywords: Sm-Nd同位素年龄黑钨矿床环斑花岗岩北京中元古代成矿作用成矿时代

Full-Text   Cite this paper   Add to My Lib

Abstract:

鉴于缺少可直接用于同位素测年的金属矿物,许多钨矿床的成矿时代大多数是悬而未决的地质难题。本文以我国著名北京密云沙厂环斑花岗质杂岩体内产出的黑钨矿为研究对象,对钨矿床的形成年龄进行了测定,8件黑钨矿Sm-Nd同位素等时线年龄为1430±93Ma(2σ),Nd初始比值为0.510992±3(2σ)和ε_(Nd)(1430Ma)为-10.5±0.84(2σ),这是迄今在我国测定到的最老的钨矿床成矿年龄。通过对全国已有钨矿床同位素年龄数据的对比分析,并且结合它们的地质与地球化学特征,可以认为,我国最古老的钨矿床很可能形成于中元古代,而并非是古生代。另外,密云沙厂地区钨矿床的成矿作用与中元古代富矿碱性岩浆活动有关。

References

[1]  康永孚,苗树屏,李崇佑,古菊云,李亿斗,吴永乐.1994.中国钨矿床.见:宋叔和主编.中国矿床(中册).北京:地质出版社,1~104.
[2]  聂凤军,裴荣富,吴良士,Bjorlykke A.1994.内蒙古白银都西群变质火山岩的钕-锶同位素研究.地质论评,40(5):476~481.
[3]  郁建华,傅会芹,张凤兰,万方晓,哈巴拉,拉莫,发斯乔基.1996.华北地台北部非造山环斑花岗岩及有关岩石.北京:中国科学技术出版社,1~182.
[4]  Mearns E W. 1986. Sm-Nd ages for Norwegian garnet peridotite.Lithos. , 19: 269~278.
[5]  Nie Fengjun, Pei Rongfu, Wu Liangshi, Bjorlykke A. 1994. Nd andSr isotope study on metamorphosed volcanic rocks of theBayanduxi Group, Inner Mongolia, China. Geological Review, 40(5) :476~481 (in Chinese with English abstract).
[6]  Ramo O T, Haapala I, Vaasjoki M, Yu J H, Fu H Q. 1994. TheShachang rapakivi granite complex, eastern China: implication forSm-Nd, Th-U-Pb and Rb-Sr systematics of the Archean Sino-Korean craton. In: Lanphere M A, ed. Conference Abstract onGeochronology, Cosmochronology and Isotope, USGS Circular,1107.
[7]  Depaolo D J. 1981. Nd in the Colorado Front Range and implication for crust formation and mantle evolution in the Proterozoic. Nature, 291:193~196.
[8]  Jacobsen S, Wasserburg G J. 1984. Sm-Nd isotopic evolution inchondrites and achondrites Ⅱ. Earth Planet. Sci. Lett., 67:137~150.
[9]  Kang Yongfu, Miao Shuping, Li Yidou, Gu Juyun, Wu Yongle.1994. Tungsten deposits of China. In: Song Shuhe ed. MineralDeposits of China (volume 2). Beijing: Geological PublishingHouse, 1~104 (in Chinese).
[10]  Ludwig D R. 1990. ISOPLOT for MS. DOS: a plotting and regressionprogram for radiogenic isotopic data for IBM PC compatiblecomputers. Version 2. 11. U.S. Geological Survey Open-FileReport, 88~557.
[11]  Ramo O T, Haapala I, Vaasjoki M, Yu J H, Fu H Q. 1995. 1700 MaShachang complex, north-east China: Proterozoic rapakivi granitenot associated with Paleoproterozoic orogenic crust. Geology, 23(9): 815~818.
[12]  Yu J H, Fu H Q, Zhang F L, Wan F X, Haapala I, Ramo T O,Vaasjoki M. 1996. Anorogenic rapakivi granites and related rocksin the northern of the north China craton. Beijing: China Scienceand Technology Press, 1~182 (in Chinese).

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133