吉林省大黑山南段新生代隆升的裂变径迹证据

Fission track thermochronology evidence for Cenozoic uplifting of the southern Daheishan in Jilin, China

运用裂变径迹年代学方法对吉林大黑山南段及东侧佳—伊地堑的岩石样品中的磷灰石进行分析,获得测试样品的表观年龄,并运用模拟退火法对部分样品热历史进行模拟,获得样品的热演化史,从而对大黑山南段及东侧佳—伊地堑的隆升历史进行分析和解释。研究结果表明:大黑山北中部隆升时间明显比南部的早,分别为64 Ma和43 Ma,且晚于东侧的佳—伊地堑的隆升时间(85 Ma),说明大黑山存在差异隆升作用;通过对大黑山隆升时间的确定,推断其西侧的梨树断陷早白垩世沉积范围远大于如今沉积范围,可达佳—伊地堑以东,这对梨树断陷油气勘探思路有启示意义。

Using the fission track chronology method to analyse the rock samples of the apatite of southern Daheishan and Jia —Yi graben, apparent ages of the samples were obtained. Using the simulated annealing method to simulate the thermal history of some samples, the sample thermal evolution was obtained. The uplift time from the north—central to south is progressively earlier in Daheishan, and it is respectively 64 Ma and 43 Ma, which is later than that in Jia — Yi graben（85 Ma）.The uplift of the Daheishan shows intensive difference in different areas. It is deduced that the Lishu depression in Songliao basin in early cretaceous sedimentary range is far larger than that in nowadays based on the Daheishan uplift time, and can reach the east of Jia — Yi graben, which has great significance to oil-gas exploration in Lishu depression.