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云开地块地处华南南缘,紧邻印支地块,是约束华南陆块南缘中生代构造热事件时空格架的理想地区.通过云开地块内主要岩石类型的磷灰石和锆石裂变径迹热年代学研究揭示出:不论岩石类型如何,区内锆石裂变径迹年龄主体变化于97.4~133.0Ma间,而磷灰石裂变径迹年龄变化于43.2~68.4Ma间,峰值径迹长度约为13μm,呈单峰正态分布.由此推断云开地块晚中生代以来隆升幅度达5km以上,区域上裂变径迹年龄反映晚中生代以来云开地块内部不同地区有着差异的隆升幅度,特别是25~30Ma以来具更快的隆升剥露速率.上述热年代学为深入理解华南中新生代构造地貌格局提供了新的研究资料.
Located in the southern margin of South China, close to the Indosinian block, the Yun-Kai block is an ideal area for constraining the space-time framework of the Mesozoic tectonic thermal event on the southern margin of the southern block of South China.According to the main rock types of apatite and zircon Fission track thermal geochronology studies reveal that regardless of the rock type, the main body of the zircon fission track ages vary from 97.4 to 133.0 Ma, while the apatite fission track age changes from 43.2 to 68.4 Ma, the peak diameter The trace length is about 13μm, showing a single-peak normal distribution. It is inferred that the uplift of Yunkai block since the late Mesozoic was over 5km. The fission track age above the region reflects the difference in different parts of Yunkai block since the late Mesozoic Uplift rate, especially since 25 ~ 30Ma.The above geothermal chronology provides new research data for further understanding of Meso-Cenozoic tectonic geomorphology in South China.