大别造山带花岗岩类和正片麻岩的Rb／Sr分区
TheRb/Sr characters of granitiods and orthogneisses at the Dabie Mountains
-
摘要: 根据花岗岩类和片麻岩的Ｒｂ／Ｓｒ比值和其他岩相学和地球化学性质，大别造山带可以分为下列四个带：（１）北大别北带：是一个灰色片麻岩和基性、超基性岩带，其灰色片麻岩的Ｒｂ／Ｓｒ比值为０．０１～０．０９；（２）北大别南带：为中酸性岩浆活动和强裂混合岩化的区域，其片麻岩的Ｒｂ／Ｓｒ比值为０．１１％～０．４０，花岗岩类为０．３％～０．９；（３）南大别带：为一构造混杂带，超高压变质作用和岩浆活动和混合岩化均有Abstract: Based on the ratios of Rb/Sr and othercharacters of geochemistry, the Dabie Mountains could be divided into four belt. They are,from north to south, Northern belt of North Dabie (NNDB), Southern belt of North Dabiebelt (SNDB), Sourth Dabie belt (SDB) and Yangtze belt (YZB). NNDB is composed mainly ofgrey gneisses, that have Rb/Sr ratios of 0.01～0.09 and mafic-ultramafic rocks. SNDB has a lot of acidintrusion, Rb/Sr ratio of 0.3～0.9 and trondhjemiyic gneisses, having Rb/Sr ratios of 0.11～0.40. SDB is characterized by the occurrence of UHP rock.Studies on the ratios of Rb/Sr indicated a value of 0.05～0.07. YZB is mainly composed of grey gneisses and gneissicgranites, that have Rb/Sr ratios of 0.04～0.27.
-
Key words:
- Dabie Mountains /
- Granitoids /
- Orthogneisses /
- Ratios of Rb/Sr
-
-
[1] 徐树桐 刘贻灿.大别山的构造格局和演化[M].安徽:科学出版社,1994..
[2] 谢智 陈江峰.大别造山带变质岩和花岗岩的钕同位素组成及其地质意义[J].岩石学报,1996,12(3):401-408,.
[3] 赵宗溥.试论陆内型造山作用[J].地质科学,1995,30(1):19-28.
[4] 赵宗溥.试论陆内型造山作用：以秦岭—大别山造山带为例[J].地质科学,1995,30(1):19-28,.
[5] Zheng Xiangshen，Sci Geol Sin，1998年，7卷，4期，527页
[6] Feng Xue，Jour Geol，1997年，105卷，744页
[7] Zhai Mingguo，Geol Rev，1995年，36卷，867页
[8] 金成伟 郑祥身.大别岳西地区花岗岩类岩石学及其成因[J].岩石学报,1998,14(4):493-502,.
-
计量
- 文章访问数: 6974
- PDF下载数: 5828
- 施引文献: 0
下载: