摘要
The Miba granite is located in the juncture of Kang County in eastern Gansu Province and Lueyang County in Shanxi Province. It is considered to be the post-orogenic granite (POG-type) by major element discrimination method of Maniar. 40Ar/39Ar dating indicates that its emplacement time is about 240-230 Ma and it is the result of the Indo-Sinian magmatism. In the early Yanshan period (about 193.8 Ma), a thermal event resulted in the partial opening of the argon isotope system of the biotite.
The Miba granite is located in the juncture of Kang County in eastern Gansu Province and Lueyang County in Shanxi Province. It is considered to be the post-orogenic granite (POG-type) by major element discrimination method of Maniar. ~40Ar/~39Ar dating indicates that its emplacement time is about 240-230 Ma and it is the result of the Indo-Sinian magmatism. In the early Yanshan period (about 193.8 Ma), a thermal event resulted in the partial opening of the ar- gon isotope system of the biotite.
基金
supported by the National Key Basic Research Development Project of China(Grant No.2001CB409807)
the Geological Science Key Basic Project of the Ministry of Land and Resources(Grant No.20010202)
the National Natural Science Foundation of China(Grant No.49973003).
