Ar-40-Ar-39 dating of phologopite from the Xishimen skarn iron deposit in the Handan-Xingtai area, southern Hebei, and its implications

作者：Zheng JianMin^*; Xie GuiQing; Liu Jiu; Chen MaoHong; Wang SanMin; Guo ShaoFeng; Gao Xiong; Li GuangDong

来源：Acta Petrologica Sinica, 2007, 23(10): 2513-2518.

• skarn iron deposit
• phlogopite
• Ar-40-Ar-39 dating
• Handan-Xingtai area

The Xishimen iron deposit is the largest skarn iron deposit in the Handan-Xingtai area, southern Heibei. The principal ore mineral is magnetite. Ar-40-Ar-39 dating of phlogopite associated with magnetite in ores yields a plateau age of 133.1 +/- 1.3 Ma and an isochron age of 133.6 +/- 2.5 Ma, suggesting an Early Cretaceous age for the formation of the Xishimen iron deposit, which is conssitent with or close to the ages of the porphyrite iron deposit in the Ning-Wu area and skarn iron deposits in Laiwu and Jinling, Shandong. The deposit formed in a tectonic setting of substantial lithospheric thinning.

• 出版日期2007-10
• 单位中国地质大学（北京）; 中国地质科学院矿产资源研究所