1. The study on secondary isochron of anomalous lead is a very important problem in the common lead isotope geology.

2. At the same time, a Sm-Nd isochron age of 1180 Ma is obtained. According to the regional stratigraphic correlation, isotopic age and micropaleoplants, we put the Gaolan Group in the Mesoproterozoic.

3. Its age determined by Rb - Sr isochron is 306 Ma , suggesting that it was formed at Hercynian.

4. Nowadays, the main method of determining oil and gas well deliverability is steady well test, that is back-pressure testing, isochronal testing, revisionary isochron test and single-point test.

5. A line joining points of equal time or age, such as a reflection in a seismic profile or contours in an isochron map.

6. This study provides a high-precision Re-Os isotopic dating for ten molybdenite separated from the different ore types with an isochron age of (168.