青海督冷沟地区万保沟群火山岩地球化学特征
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摘要
分布于青海督冷沟一带的万保沟群火山岩,是一套浅变质基性—中基性火山岩组合,以基性熔岩为主,通过对样品的综合分析,其主量元素特征表明该套火山岩主要为洋岛拉斑玄武岩系列,有向板内拉斑玄武岩过渡的趋势,稀土元素特征显现出与E型洋中脊玄武岩或P型洋中脊玄武岩相似,微量元素特征则表明万保沟群玄武岩与其中的板内拉斑玄武岩更为接近,综合来看万保沟群火山岩应属洋岛型玄武岩。
The volcanic rocks of Wanbaogou group in Dulenggou region of East Kunlun, is a set of light metamorphic-medium base volcanic rocks,which is dominated by basic lava. A comprehensive analysis of the sample,Thecharacteristics of major elements show that the volcanic rocks of Wanbaogou Group mainly belonging to oceanic island basalt(OIB), hasing the evolution trend of intraplate tholeiitic alkali basalt,characteristics of rare earth elements are similar to mid-ocean ridge basalt( MORB) of E or P type,characteristics of trace elements also shows that the basalts of Wanbaogou Group closing to intraplate tholeiitic alkali basalt.In summary,the volcanic rocks of the Wanbaogou Group belong to oceanic island basalt(OIB).
The volcanic rocks of Wanbaogou group in Dulenggou region of East Kunlun, is a set of light metamorphic-medium base volcanic rocks,which is dominated by basic lava. A comprehensive analysis of the sample,Thecharacteristics of major elements show that the volcanic rocks of Wanbaogou Group mainly belonging to oceanic island basalt(OIB), hasing the evolution trend of intraplate tholeiitic alkali basalt,characteristics of rare earth elements are similar to mid-ocean ridge basalt( MORB) of E or P type,characteristics of trace elements also shows that the basalts of Wanbaogou Group closing to intraplate tholeiitic alkali basalt.In summary,the volcanic rocks of the Wanbaogou Group belong to oceanic island basalt(OIB).
引文
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李昌年.1992.火成岩微量元素岩石学[M].武汉:中国地质大年大学出版社,74-125.
青海省地质矿产局. 2006.青海省岩石地层[M].武汉:中国地质大学出版社,46-48.
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杨经绥,柴耀楚,冯秉贵.1987.东昆仑万宝沟群中的基性火山岩特征及其成因探讨[J].岩石矿物学杂志,6(2):122-130.
殷鸿福,张克信.1997.东昆仑造山带的一些特点[J].地球科学—中国地质大学学报,22(4):339-342.
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