| 青藏高原北部新生代火山岩岩石化学特征及其构造意义 |
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| 引用本文： | 李才,范和平,徐锋.青藏高原北部新生代火山岩岩石化学特征及其构造意义[J].现代地质,1989,3(1):58. |
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| 作者姓名： | 李才 范和平 徐锋 |
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| 作者单位： | 长春地质学院
(李才)，西藏地矿局区域地质调查大队
(范和平)，西藏地矿局区域地质调查大队(徐锋) |
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| 摘 要： | 青藏高原北部东西向展布的以安山岩为主的新生代火山岩带,以黑石湖—亚克错—多格错仁一线为界可分为北侧的钙碱性岩系亚带和南侧的碱性岩带亚带。火山岩明显富钾。其形成与塔里木—柴达木板块向高原的楔入作用有关,是消减带上物质重熔上升的结果。
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| 关 键 词： | 青藏高原 岩石化学 板块 火山岩 |
LITHOCHEMICAL CHARACTERISTICS OF CENOZOIC VOLCANIC ROCKS IN QINGHAI-XIZANG(TIBET) AND ITS STRUCTURAL SIGNIFICANCE |
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| Li Cai.LITHOCHEMICAL CHARACTERISTICS OF CENOZOIC VOLCANIC ROCKS IN QINGHAI-XIZANG(TIBET) AND ITS STRUCTURAL SIGNIFICANCE[J].Geoscience——Journal of Graduate School,China University of Geosciences,1989,3(1):58. |
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| Authors: | Li Cai |
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| Abstract: | There in the northern Qinghai-Xizang (Tibet) plateau develops ,a latitudinal zone of volcanic rocks. Its length is greater than 1000km and its width may reach to 300km in its eastern segment, its distributing area is about 8000km2. According to its distribution characteristics, it may be divided into four litho,districts, which are:
1.Dogai Coring lithodistrict-
2,Hoh Xil lithodistrict.
S.YongbeCo lithodistrict.
4,Western Kunlun Mt. lithodistrict.
Its characteristics are summarized as follows:
l.The occurrences of this lithozone show as mainly lava-covers in the east, but mostly lava flow and volcanic cone in the west. The eruptive type belongs to the Hawaiian-trombolian type.
2, Base on the isotopic age information, it is determined that the age of volcanic activities is from Neogene to Quaternary. There is still a strong volcanic activity within Western Kunlun Mt. area in fifty's of this century. This is the latest volcanic activity ici Chinese continent.
3, According to the lithochemical features, its two subzones have been divided into calci?alkaline and alkaline volcanic rocks zone. The first distributes along the northern margin of Qinghai-Xizang (Tibet) plateau, and the latter distributes within the zone of Heishibeihu-(黑石北湖)-Yake Co(亚克错)-Dogai Coring (多格错仁) which corresponds with .the recent subduction zone where the oceanic plates have subducted toward continental plate, but the rock components of typical tholeiitic series are wanting.4,Judged from the Rittmann-Gottini figure, this zone of volcanic rocks . belongs mainly to volcanic rocks of orogenic zones. This is in accord with the tectonic sitting where it occurred.
The authors of this paper consider that the formation of this Cenozo;c volcanic rock's zone is bound with the putting in to of the Tarim (塔里木),Qaidam(柴达木)plate under the Qinghai-Xizang plateau, it is one of material moving phenomena in the processe of the putting in to. |
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| Keywords: | : Qinghai-Xizang(Tibet) plateau Lithochemistry plate volcanicRock |
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