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The blueschists in western Yunnan Province are distributed in Lancangjiang and Ailaoshan metamorphic belts and occur as interlayer in green schist and mica schist. Their protolith is basaltic and pelitic rocks with a mineral assemblage of Cr (or Win)+Ab+Qz+Chl+Ph+Ep+Sph+Act and Gl+Ph+Tc+Ep+Alm+Qz+Do, respectively. The P-T conditions of blueschist metamorphism range from 170—443℃ at c. 4—6. 7 kbar. The origin of blue schist of the Lancangjiang belt is related to the subduction and the close of the paleo-Tethys oceanic basin. The Ailaoshan blueschist, however, may be related to the continent continent collision and the dynamic metamorphism. 相似文献
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本文利用电子显微镜研究了江苏东海榴辉岩中的角闪石和陕西鱼洞子群变质角闪岩中的角闪石微结构,发现这些角闪石存在位错和其他缺陷。在榴辉岩的角闪石中,位错为刃型位错,刃位错线平行c轴,B矢量值为9,矢量方向有两类:大多数//[100],少数//b轴。位错露头在a~*-b~*面上线型排列成位错壁。位错壁两侧的亚晶粒有微小的取向偏差,形成2—5°的小角晶界,且刃位错露头间隔越密,晶体扭曲越大,小角晶界也越大。在含水条件下角闪石通过交代反应,逐步增宽pyribole链体,在剪切带内生成滑石结构,并不断把角闪石颗粒细粒化。 相似文献
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DISTINGUISHING OF TWO VOLCANIC ROCK SERIES IN THE LANCANG GROUP, YUNNAN PROVINCE, SW CHINA AND ITS GEOLOGICAL IMPLICATION 总被引:1,自引:0,他引:1
The detailed study on petrochemistry and geochemistry shows that meta-volcanics from Huimin and meta-basalts from Suyi belong, respectively, to different volcanic series. The former is of non-alkalic volcanic series and the latter is of straddle A-type alkslic series. Based on their geochemical characteristics of REE, LIL, HFS and Nd, Sr isotope elements, we suggest that Huimin volcanics were formed in an island arc setting and Suyi basalts were formed in a back-continental arc extensive setting. These two volcanic series have not petrogenic relationship. 相似文献
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