摘要
江西地区存在陆壳重熔和同熔两种类型火山侵入杂岩。它们具有明显不同的同位素组成:陆壳重熔型具有低的ε_(Nd)值,高的(^(87)Sr/^(86)Sr)_i,^(207)Pb/^(204)Pb和δ^(18)O值,同熔型具有高的ε_(Nd)值,低的(^(87)Sr/^(86)Sr)_i,^(207)Pb/^(204)Pb和δ^(18)O值。它们的主、微量元素组成也具有类似的区别。这些差异反映它们的物质来源不同:陆壳重熔型以地壳物质为主,上地壳端员约占70％,同熔型以地幔物质为主,上地壳端员仅占约30％。
There exist two types of volcanic-intrusive complexes in Jiangxi Province: remelting-type of continental crust and syntectic type. The former has low ε_(Nd), higher (^(87)Sr/^(86)Sr)i, ^(207)Pb/^(204)Pb and δ^(18)O values. They are also different obviously in major and trace dement contents. These differences indicate their different source materials. Crustal materials are predominant in remelting type of continental crust, with. 70％ of upper-crustal end-member, but mantle materials are predominate in syntectic type, with only 30％ of upper crustal end-member.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第2期177-184,共8页
Acta Petrologica Sinica
基金
国家自然科学基金48970173号"江西上侏罗统S型火山岩微量元素和同位素地球化学研究"
关键词
侵入杂岩
火山岩
同位素
地球化学
Volcanic-intrusive complex
Remelting type
Syntectic type
Isotope
Jiangxi Province
