The <sup>40</sup>Ar/<sup>39</sup>Ar ages indicate that the eclogite facies rocks of the Hasiate slice in the western Tianshan Mountains were formed at the early stage of Devonian （401 Ma） and...The <sup>40</sup>Ar/<sup>39</sup>Ar ages indicate that the eclogite facies rocks of the Hasiate slice in the western Tianshan Mountains were formed at the early stage of Devonian （401 Ma） and had been uplifted to the greenschist facies tectonic level in the middle stage of Devonian （381 Ma）. The formation and uplift of the blueschists of the Akesayi slice are constrained to the late stage of Devonian （370-364 Ma）. The different tectonic slices in the high-pressure metamorphic belt have experienced the different uplift history.展开更多
The Xidatan rock series consist of mylonite, gneiss and granite. The U-Pb age shows that the granite was formed at 206 Ma, and the 40Ar/39Ar ages of the biotite display that the mylonite was formed at 145 Ma when the ...The Xidatan rock series consist of mylonite, gneiss and granite. The U-Pb age shows that the granite was formed at 206 Ma, and the 40Ar/39Ar ages of the biotite display that the mylonite was formed at 145 Ma when the Xidatan ductile shear zone occurred. At about 110-100 Ma, the Xidatan Fault reactivated again. As a result, the biotite and muscovite of Xidatan rock series opened their argon isotope system.展开更多
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 m...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.展开更多
文摘The <sup>40</sup>Ar/<sup>39</sup>Ar ages indicate that the eclogite facies rocks of the Hasiate slice in the western Tianshan Mountains were formed at the early stage of Devonian （401 Ma） and had been uplifted to the greenschist facies tectonic level in the middle stage of Devonian （381 Ma）. The formation and uplift of the blueschists of the Akesayi slice are constrained to the late stage of Devonian （370-364 Ma）. The different tectonic slices in the high-pressure metamorphic belt have experienced the different uplift history.
基金supported by the National Natural Science Foundation of China(Grant No.49973003)the National Key Basic Research Development Project of China(Grant No.2001CB409807)the Geological Science Special Project of the Ministry of Land and Resources(Grant No.2001010205).
文摘The Xidatan rock series consist of mylonite, gneiss and granite. The U-Pb age shows that the granite was formed at 206 Ma, and the 40Ar/39Ar ages of the biotite display that the mylonite was formed at 145 Ma when the Xidatan ductile shear zone occurred. At about 110-100 Ma, the Xidatan Fault reactivated again. As a result, the biotite and muscovite of Xidatan rock series opened their argon isotope system.
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).
文摘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.
