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首页> 外文期刊>Chinese science bulletin >Meso-Cenozoic uplifting and exhumation on Yunkaidashan: Evidences from fission track thermochronology
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Meso-Cenozoic uplifting and exhumation on Yunkaidashan: Evidences from fission track thermochronology

机译：云开大山中新生代隆升与掘出：裂变径迹热年代学证据

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摘要

Yunkaidashan, located at the southern South China block (SCB) and closely adjacent to the Indochina block, is an ideal region for better understanding the temporal and spatial framework of tectonothermal overprinting at the southern SCB since Mesozoic. Apatite and zircon fission track thermochronology of various-type rocks from Yunkai-dashan is presented in this paper. 'The results show, no matter what rocks are, the apparent ages of zircon fission track range from 97.4 to 133.0 Ma, and those of apatite fission track from 43.2 to 68.4 Ma. The length of apatite fission track yields an average confined track length of approx 13 mu m and shows normal distribution of unimodal frequency. It is inferred that the uplifting amplitude has been more than 5 km in Yunkaidashan since late Mesozoic. The difference of fission track apparent ages at different locations in Yunkai-dashan suggests a paleophysiognomic scenario of the heterogeneous uplift/denudation. These data of the fission track thermochronology provide new constraints for better understanding the tectonophysiognomic pattern of the SCB since late Mesozoic.
机译：云南大山位于华南地块的南部，紧邻印度支那地块，是一个理想的区域，可以更好地了解中生代以来南部地带的构造热套印的时空框架。本文介绍了云开大山各类型岩石的磷灰石和锆石裂变径迹热年代学。 ``结果表明，无论是什么岩石，锆石裂变径迹的表观年龄在97.4至133.0 Ma之间，而磷灰石裂变径迹的表观年龄在43.2至68.4 Ma之间。磷灰石裂变径迹的长度产生的平均封闭径迹长度约为13微米，并显示出单峰频率的正态分布。据推测，自中生代晚期以来，云开大山的抬升幅度已超过5 km。在云开大山不同位置的裂变径迹表观年龄的差异表明了非均匀隆升/剥蚀的古地貌情景。裂变径迹年代学的这些数据提供了新的约束条件，以便更好地了解自中生代晚期以来SCB的构造生理学模式。

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