Mesoproterozoic age for Xiamaling Formation in North China Plate indicated by zircon SHRIMP dating

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2008,（17）
• 页码范围: 2665-2671
• 页数: 7页
• 语种: 英文
• DOI: 10.1007/s11434-008-0340-3

摘要

Zircon grains of magmatic origin from tuffite layers in the Xiamaling Formation at Zhaojiashan Village, Xuanhua area, Hebei Province, were used for zircon dating with a Sensitive High-Resolution Ion Mi-croprobe (SHRIMP Ⅱ), which gives a weighted mean 207pb/206Pb age of 1366±9 Ma. It shows a very similar age (1368±12 Ma) as the zircon dating from the Xiamaling Formation in Western Hill, Beijing. This age proposes that the Xiamaling Formation in the North China plate should be of Mesoproterozoic, instead of Neoproterozoic based on K-Ar, Ar-Ar dating. The new zircon age also indicates the devel-opment of macrofossils algae from the Mesoproterozoic age.