古温标重建沉积盆地热史的能力探讨

通过对理论热史模型的正反演计算，对现今沉积盆地热史研究中两类常用的古温 标镜质体反射率和磷灰石裂变径迹在恢复盆地热史方面的能力进行了探讨．结果表明两类 古温标都不能可靠地反映整个受热过程，镜质体反射率只能恢复样品经历的最高古地温，磷 灰石裂变径迹可以重建近期降温过程，两类古温标存在互补性．同时指出这一结果是由古温 标本身的成熟演化机制决定的．在实际应用时，必须密切结合研究区的构造演化，联合多种 方法和手段，才有可能使热史分析结果符合客观实际．

DISCUSSION ON THE ABILITIES OF THERMAL INDICATORS IN RECONSTRUCTING THERMAL HISTORY OF SEDIMENTARY BASIN

On the basis of analyses of forward and inversion results of some synthetic thermal models. Two thermal indicators vitrinite reflectance and apatite fission track are discussed on their ability in reconstructing thermal history of sedimentary basin. The results show that the two thermal indicators are not able to give the whole thermal history. Vitrinite reflectance can only reveal the maximum paleotemperature, which samples experienced, and apatite fission can be used to reconstruct the recent cooling history. The two thermal indicators can reinforce each other. It is emphasized that the above result is dependent upon their own maturation mechanisms. In practice, it is necessary to consider the tectonic evolution of studied area and combine these two methods with other means to obtain more reliable thermal information.