湘中地区冷家溪群和板溪群锆石U-Pb年龄、Hf同位素特征及对华南新元古代构造演化的意义OA北大核心CSCDCSTPCD
Zircon U-Pb age and Hf isotope compositions of Lengjiaxi and Baxi Groups in middle Hunan Province: implications for the Neoproterozoic tectonic evolution in South China
通过对江南造山带中段冷家溪群和板溪群凝灰岩及碎屑岩锆石U-Pb定年及系统的Hf同位素分析表明,冷家溪群沉积时代大致在860～820 Ma,不整合在其上的板溪群沉积下限在820Ma左右,这表明在江南造山带,晋宁造山运动之后,很快进入伸展裂解阶段.锆石的Hf同位素组成显示,在850～800Ma之间,锆石Hf初始值表现出快速上升趋势,表明这一时期有显著的地幔物质加入.造成这一现象的原因,一方面是早期的岛弧岩浆岩(850～820Ma,尤其是Ⅰ型花岗岩)是…查看全部>>
Zircon LA -ICPMS U -Pb ages and Hf isotope compositions of the tuff and clastic rocks from Lengjiaxi Group and Banxi Group in the middle section of the Jiangnan orogenic belt were determined. The results reveal that the sedimentary time of the Lengjiaxi Group is 860-820Ma. On the other hand, the lower limit of sedimentation of the Banxi Group which overlies the Lengjiaxi Group in angular unconformity is ca.820Ma, suggesting the quick transformation from the …查看全部>>
孟庆秀;张健;耿建珍;张传林;黄文成
天文与地球科学
江南造山带冷家溪群板溪群锆石U-Pb年龄Hf同位素地球动力学背景
Jiangnan orogenic belt Lengjiaxi Group Banxi Group zircon U-Pb dating Hf isotope geodynamic settings
《中国地质》 2013 (1)
191-216,26
中国地质调查局地质调查项目(1212011121097,1212011120130)资助.
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