Rb-Sr and Sm-Nd mineral isochron ages of the metamorphic rocks in the Namaqualand Metamorphic Complex, South Africa

被引：4
|
作者：
Yuhara, M
Miyazaki, T
Ishioka, J
Suzuki, S
Kagami, H
Tsuchiya, N
机构：
[1] Fukuoka Univ, Fac Sci, Dept Earth Syst Sci, Fukuoka 8140180, Japan
[2] Kyoto Univ, Inst Geothermal Sci, Beppu, Oita 8740903, Japan
[3] Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan
[4] Tohoku Univ, Grad Sch Engn, Dept Geosci & Technol, Sendai, Miyagi 9808579, Japan
来源：
GONDWANA RESEARCH | 2002年 / 5卷 / 04期
关键词：
Rb-Sr whole-rock; mineral isochron age; Sm-Nd whole-rock; Namaqualand; South Africa; granulite;
D O I：
10.1016/S1342-937X(05)70912-6
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Rb-Sr and Sm-Nd isotopic studies were carried out for metamorphic rocks in the Namaqualand Metamorphic Complex, South Africa. The metamorphic rocks give the Rb-Sr mineral isochron ages (whole-rock - biotite - felsic fractions) of 844 85 Ma and 811.6+/-6.6 Ma for the lower granulite zone and of 776.5+/-5.4 Ma for the upper granulite zone. The rocks yield the Sm-Nd mineral isochron ages of 1071 18 Ma (whole-rock - garnet - felsic fractions) and 1067 158 Ma (whole-rock - hornblende - biotite rich fraction - felsic fractions) for the lower granulite zone and of 1052.0+/-3.6 Ma and 1002.5+/-1.4 Ma (whole-rock - garnet - felsic fractions) for the upper granulite zone. These age data suggest that the granulite facies metamorphism took place at 1060-1000 Ma, and that the rocks cooled down at 850-780 Ma. The Sr and Nd isotopic compositions of metamorphic rocks are different between the lower and upper granulite zones.
引用
收藏
页码：771 / 779
页数：9
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