- 中国地质科学院地质研究所，北京，100039
- 中国地质科学院地质研究所，北京，100040
- Institute of Geology,Chinese Academy of Geological Sciences,Beijing,100037
- Institute of Geology，CAGS，Beijing 100037
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川西得荣县共波、中木至中心绒南的沿金沙江一线出露辉长辉绿 岩。共波辉长 岩的锆石UPb年龄测定给出下交点年龄448±7 Ma，上交点年龄1821±81 Ma。在一致曲线 图 中,数据点均靠近下交点,且在7个分析中,有一个分析给出了约477±7 Ma的一致年龄, 这表 明共波辉长岩的侵位年龄可能为448±7 Ma至478±7 Ma。本文提出了金沙江地区加里东期辉 长岩侵位与古特提斯洋盆的早期演化,即与大陆裂开有关的观点。
The gabbrodiabases are exposed along the Jinsha River from Gongbo, Zhongmo t o Zhongxinrong, Derong County, Western Sichuan Province. UPb dating of zircons f rom the Gongbo gabbro has yielded a lower intercept age of 448±7 Ma, and an up per intercept age of 1821±81 Ma. On the concordia diagram, all data points are close to the lower intercept, and among 7 analyses, one zircon gives a concordan t age of 478±7 Ma. It is suggested a Caledonian Continental rifting event in re lation to early evolution of the Jinshajiang PaleoTethyan oceanic basin.
引用本文
简平,刘敦一.2002.金沙江中段共波加里东期辉长岩锆石U-Pb年龄测定[J].地质论评,48(SUPP):17-21,[DOI].
JIAN Ping, LIU Dunyi.2002. U-Pb Zirrcon Dating of the Caledonian Gongbo Gabbro from the Mid-Jinshajiang Area, Sichuan Province[J]. Geological Review,48(SUPP):17-21.
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