Isotope geochronology of Dapingzhang spilite-keratophyre formation in Yunnan Province and its geological significance |
| |
| Authors: | ZHONG Hong HU Ruizhong YE Zaojun TU Guangzhi |
| |
| Institution: | 1. Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China;Institute of Geology,Chinese Academy of Sciences,Beijing 100029,China
2. Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China |
| |
| Abstract: | On the basis of the geological field investigations and isotope geochronological studies the Sm-Nd isochron age (513 Ma±40
Ma), Rb-Sr isochron age (511 Ma±8 Ma) and K-Ar age (312-317 Ma) of the Dapingzhang spilite-keratophyre formation in Yunnan
Province are presented. From these geochronological data it is evidenced that this suite of volcanic rocks was formed in the
Cambrian and the parent magma was derived from a depleted mantle, which was influenced by crustal contamination and/or seawater
hydrothermal alteration. During the Late Carboniferous the volcanic rocks experienced relatively strong geological reworking.
This study provides geochronological evidence for the occurrence of Cambrian volcanic rocks in the Sanjiang (three-river)
area. |
| |
| Keywords: | spilite-keratophyre formation isotope geochronology Cambrian Dapingzhang Yunnan |
| 本文献已被 万方数据 SpringerLink 等数据库收录！ |
|
