南方志留系碎屑矿物热年代学分析及其地质意义

碎屑矿物热年代学是恢复多旋回沉积盆地构造演化的有利手段。本文通过对南方5个地区志留系的碎屑锆石和磷灰石的裂变径迹年龄和热历史模拟研究认识到，印支期以来研究区志留系至少经历了3次区域性的岩石抬升、冷却事件，即早中三叠世（235～250 Ma）、晚侏罗世—早白垩世（110～140 Ma）和始新世—渐新世（45～25 Ma）。其中晚侏罗世—早白垩世和始新世—渐新世是志留系后期改造的两个关键时期，前者是志留系烃源岩生烃基本停止的时期，后者是志留系抬升到地表，油气盖层受到广泛破坏的时期。

Thermochronology of Detrital Minerals in the Silurian Strata from Southern China and Its Geological Implications

Thermochronology of detrital minerals is auseful means to reveal the tectonic evolution of multi-cycle sedimentary basin. According to the fission track age of detrital zircon and apatitesamples collected from 5 areas of the Silurian strata in Southern China,the conclusion can be drawnthat the Silurian strata have experienced at least three regional uplifting and cooling events since Indosinian,in early Middle Triassic,Late Jurassic-Early Cretaceous and Eocene-Oligocene,respectively. Ofthem,the latter two are the key periods for reformation of Silurian strata. The former is the time in which the Silurian source rock stopped generatinghydrocarbon,while the latter went up to the surface,resulting in that the seal rock was destroyed intensively.