摘要
大别造山带８个变质岩和４个花岗岩样品的Ｓｍ－Ｎｄ分析结果表明，大别地块不同构造单元的岩石有不同的钕同位素模式年龄。总体上，北大别地块变质岩的钕模式年龄较老；南大别超高压地块的较年轻，但变化范围大。侵人于大别地块不同构造单元的花岗岩与北大别地块变质岩有相同的Ｎｄ（１２２Ｍａ）值范围，表明它们有相似的物质来源。南大别地块是覆盖在具有古老物源的变质岩之上的一个构造岩片。
Sin-Nd isotopic compositions of 8 metamorphic rock samples and 4 granite samples of Dabie orogen suggest that the Nd model ages are different in different tectonic units. Generally, the Nd model ages of the rocks of North Dabie Terrain(NDT)are older than those of Ultrahigh-pressure(UHP)block in South Dabie. However,Nd model ages of metamorphic rocks from UHP block vary widely. The range of Nd (122Ma) of the granites intruding into different tectonic units is the same of that of NDT metamorphic rocks.It suggests that these rocks have similar sources.Therefore,the UHP block is a slab over the older metamorphic rocks.
出处
《岩石学报》
SCIE
CAS
CSCD
北大核心
1996年第3期401-408,共8页
Acta Petrologica Sinica
基金
国家自然科学基金
中关村联合测试基金
关键词
变质岩
花岗岩
钕同位素
地质意义
:Metamorphic rock
Granite
Nd isotopic Composition
Model ages
Dabie Orogen
