华北北部中生代岩浆作用同位素示踪研究  

Research on Mesozoic Magmatism in North of Northern China Craton with Isotopic Tracing

作　　者：毛德宝 陈博 赵达 吴肖琨 

机构地区：[1]中铁资源集团投资有限公司,北京100039

出　　处：《铁道工程学报》2012年第9期13-17,共5页Journal of Railway Engineering Society

摘　　要：研究目的:华北克拉通北部分布着大量中生代岩浆岩,其成因有众多解释,本文旨在通过Sr-Nd-Pb多元同位素示踪研究探讨该地区中生代岩浆作用的形成过程、来源和动力学背景。研究结论:华北克拉通北部中生代岩浆作用的源区主要是中下地壳,其中在中性岩浆作用过程中可能有少量地幔物质的加入;印支-早燕山期岩浆活动形成在同造山地壳加厚的构造背景之下,是基底地壳物质活化改造的产物,而中晚燕山期岩浆活动形成在造山后坍塌期,与地幔底侵作用时空关系密切;在同一时间范畴内,不同深度地壳的带状批式熔融及端元岩浆的混合作用是导致不同类型岩浆的形成。Research purposes： There are much mesozoic magmatic rocks in the north of the northern China Craton and many interpretations on the cause for their formation. This paper researches the establishment, the source and the dynamics background of the mesozoic magmatism of the each magmatic rock in this area with the Sr - Nd - Pb isotopic tracing. Research conclusions： The mesozoic magmas are mainly originated from the low crust and middle crust with small amount of the mantle materials into the intermediate magmas. The many evidences showed the magmatic activity in the Indosinian and early Yanshanian epochs were developed under the geodynamic setting of synorogenic thickening crust and were the activated productions of the crust substance in the basement. The middle and late Yanshanian magamatism were probably formed during the postorogenic collapse and it was closely related to the space - time of the mantle underplating. The mixed effect of the zone batch partial melting of the crust with different depth and the end member magma caused the formation of several kinds of magmas in the same period.

关 键 词：华北克拉通 岩浆作用 中生代 同位素地球化学 

分 类 号：P597[天文地球—地球化学]