Fission Track Thermochronological Evidence for Cenozoic Uplift of Northern Central Myanmar Basin
Study of the Cenozoic uplift of the northern Central Myanmar basin is crucial to better understand both the evolution of the West Burma block and the petroleum exploration in this area.Apatite fission track dating and thermal history modeling were carried out on two detrital samples and one core bedrock sample in this study.Our results show decreasing apatite fission track (AFT)ages in western thrust belt and eastern margin of the Chindwin subbasin to the magmatic arc belt of Myanmar (i.e.,70.6±9.3 Ma,53.4±7.5 Ma and 22.7±3.0 Ma),indicating a progressive deformation of the northern Central Myanmar basin from west to east.Furthermore,the thermal modeling results indicate that in the Late Cretaceous (80 ± 1 Ma)uplift process of the northern Central Myanmar basin can be divided into four stages:uplifting,rapid uplifting,steady uplifting,and slow uplifting.The rapid uplift and cooling event at the 29—20 Ma represents the regional uplift and exhumation in the northern Central Myanmar basin,followed by the slow uplift of the basin since 4 Ma,which is interpreted as the result of eastward movement and intense collision of the Indian plate with respect to the Asian plate.Our study suggests that the Cenozoic devel-opment and progressive deformation of the northern Central Myanmar basin was the direct result of multi-phase subduction of the Neo-Tethyan/Indian lithosphere to the West Burma block.
Central Myanmar basinNeo-TethysCenozoicapatite fission trackupliftpetroleum geology
NETL
NSTL
万方数据
维普
