40Ar-39Ar dating of phologopite from the Xishimen skarn iron deposit in the HandanΞngtai area, southern Hebei, and its implications
Acta Petrologica Sinica(2007)
摘要
The Xishimen iron deposit is the largest skarn iron deposit in the Handan-Xingtai area, southern Heibei. The principal ore mineral is magnetite. 40Ar-39Ar 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.
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关键词
40Ar-39Ar dating,Handan-Xingtai area,Phlogopite,Skarn iron deposit
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