松辽盆地与大兴安岭新生代热构造耦合研究

Thermal structure research on Cenozoic in Songliao Basin and Dahinganling Mountain

通过磷灰石裂变径迹热史模拟的方法,精确揭示了在新生代时期松辽盆地与大兴安岭的热构造史,并分析了它们的盆山耦合关系。大兴安岭的隆升具有幕式的特点,隆升速率表现为5低4高;盆地的演化比较复杂,但总体上表现为三次抬升和两次沉降。我们认为松辽盆地与大兴安岭在新生代的盆山关系大体上可分为3种类型4个阶段:65.5—50Ma,山体抬升、盆地也随之抬升;50—36Ma,山体慢速抬升、盆地沉降,山体快速抬升,盆地抬升;36—5.83Ma,山体慢速抬升、盆地慢速沉降,山体快速抬升、盆地快速沉降;5.83—0Ma,与第一阶段相同。

Thermal history simulation of Apatite Fission Track shows that the thermal structure history in Cenozoic and the relationship between Songliao Basin and Dahinganling Mountain. Uplift of Dahinganling reveals its act character; its velocity shows 5 decreasing phases and 4 increasing ones. Although basin evolvement is quite complex, it behaved as three uplifts and two sedimentations. It is considered here that the relationship between Songliao Basin and Dahinganling includes three styles and 4 phases, that is, basin uplifted with mountain during 65.5-50 Ma; basin subsided while mountain uplifted slowly and basin uplifted rapidly while mountain uplifted rapidly during 50-36 Ma; basin subsided slowly while mountain uplifted slowly and basin subsided rapidly while mountain uplifted rapidly during 36-5.83Ma; the latest phase was the same with the first one.