| TWO TYPES OF CENOZOIC HIGH-K MAGMATINSM IN EASTERN TIBET:IMPLICATIONS FOR THE NATURE OF MANTLE SOURCES |
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| 作者姓名： | Wang Jianghai Xie Guanghong[WT ”BX] |
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| 作者单位： | Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Wushan，Guangzhou 510640，China |
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| 基金项目： | theNationalNaturalScienceFoundationofChina( 49972 0 2 6 )，ChineseNationalKeyProjectforBasicRe
searchonTibetanPlateau (G19980 |
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| 摘 要： | TWO TYPES OF CENOZOIC HIGH-K MAGMATINSM IN EASTERN TIBET:IMPLICATIONS FOR THE NATURE OF MANTLE SOURCES1 ArnaudNO ,VidalP ,TapponnierP ,etal.ThehighK2 OvolcanismofnorthwesternTibet:geochemistryandtectonicim plicationsJ] :EarthPlanetSciLett,1991,11:351～ 36 7.
2 DengW .CenozoicvolcanicrocksinthenorthernNgaridistrictoftheTibet DiscussionontheconcurrentsubductionJ] .Ac taPetrolSinica ,1989( 3) :1～ 11.
3 HarrisonTM ,LeloupPH ,RyersonFJ,…
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TWO TYPES OF CENOZOIC HIGH-K MAGMATINSM IN EASTERN TIBET:IMPLICATIONS FOR THE NATURE OF MANTLE SOURCES |
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| Abstract: | Cenozoic high\|K igneous rocks are widely distributed in eastern Tibet. These rocks are exposed as flows, dykes and small intrusions along a narrow north\|south trending zone, which follows Tertiary fold belts and the Batang—Lijiang and Ailao Shan—Red River strike\|slip systems. Although several models were proposed to interpret their petrogenesis (Deng, 1989; Arnaud et al., 1991; Turner et al., 1996; Yin et al., 1995; Miller et al., 1999), their origin still remains hotly debated. Moreover, the published results were only focused on the high\|K igneous rocks resulted from partial melting of an enriched lithospheric mantle. Here, we present the detailed documents to testify the existence of a new kind of high\|K igneous rocks in eastern Tibet.Our new 39 Ar/ 40 Ar age data (Wang et al., 1999) and published age data for high\|K rocks in eastern Tibet show two distinctive magmatic episodes: one between 42Ma and 24Ma, and the other since ca.16Ma. They correspond to two types of high\|K magmatism in eastern Tibet. We name the older and younger groups as types Ⅰ and Ⅱ, respectively. |
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| Keywords: | Cenozoic high\|K magmatism enriched and depleted mantle sour ce Pb\|Sr\|Nd isotopes transpressional and transtensional tectonics Eastern T ibet |
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