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地质通报  2005 

粤西信宜地区坑坪细碧-角斑岩系的发现及其地质意义

, PP. 648-654

Keywords: 粤西,信宜,坑坪,早震旦世,细碧-角斑岩系,Rodinia超大陆裂解

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Abstract:

在两广交界的云开地区信宜坑坪新发现超镁铁质角闪黑云辉橄岩、角闪黑云辉岩、石棉矿、辉长辉绿岩、粒玄岩、细碧岩和石英角斑岩,并伴生有色深层薄和色浅层厚2种硅质岩。细碧岩的SiO2为48.44%~52.32%,K2O+Na2O=3.473%~4.77%,较正常玄武岩偏高,Na2O和CaO互为消长关系。石英角斑岩SiO2为70%左右,CaO和Na2O不稳定。这些岩石的稀土元素配分曲线总体比较平滑,略右倾,微Eu负异常,δEu=0.8~1.03;(La/Yb)n介于1.31~3.16之间;等时线年龄Sm-Nd为667Ma±43Ma,Rb-Sr为663Ma±17Ma。

References

[1]  Miyashiro A. Classification,characteristics and origin of ophiolites[J]. J. Geol.,1975,83:249-281.
[2]  Pearce J A.Trace element characteristics of lavas from destructive plate boundaries [A]. In: Thorps R S ed. Andesites [C]. New York: John Wiley & Sons,1982.525-548.
[3]  Mechede M A. A method of discriminating between different type of mid-ocean basalts and continental tholeiites with the Nb-Zr-Y diagram[J]. Chem. Geol., 1986,56: 207-218.
[4]  赵振华.微量元素地球化学原理[M].北京:科学出版社,1997.112-120.
[5]  夏林圻,夏祖春,徐学义.北祁连山海相火山岩岩石成因[M].北京:地质出版社,1996.
[6]  Weaver B L.Trace element geochemistry of Madras granulites [J].Contrib. Mineral. Petrol.,1980,71:271-280.
[7]  凌文黎,程建萍.Rodinia研究意义、重建方案与华南晋宁期构造运动[J].地质科技情报,2000,19(3):7-9.
[8]  Winchester J A, Floyd P A. Geochemical discrimination of different magma series and their differentiation products using immobile elements[J]. Chem. Geol.,1977,20:325-343.
[9]  高秉章,洪大卫,郑基俭,等.花岗岩类区1∶5万区域地质填图方法指南[M].北京:地质出版社,1991.35-36.
[10]  Barberi F,Santacire R,Veret J. Chemical aspects of rift magmatism[A]. In: Palmason G ed. Continental and rift[C]. Washington: American Geophysical Union, 1982.235-258.

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