滇西北独龙江岩体晚中新世以来的热史和剥蚀历史的磷灰石裂变径迹记录
Thermal and denudational history of granitoid batholith recorded by apatite fission track in the Dulong River region in northwestern Yunnan, since Late Miocene
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摘要: 位于藏东-滇西高原构造急剧转折地段的独龙江地区,其花岗岩体内系统垂向取样的9个花岗闪长岩样品的磷灰石裂变径迹年龄数据在4～6.8Ma之间.裂变径迹分析显示样品应处于剥露的部分退火带,其表观年龄主体表现为冷却年龄,部分具混合年龄特征.热史分析揭示出岩体至少记录了自晚中新世以来的3个显著冷却阶段.早期的时限可推至约13～8Ma,中、晚期的时限分别在约5.5Ma和2.8Ma,基本可以与区域上的不整合相对应.依据冷却史推导的各阶段剥蚀速率分别为0.10～0.12mm/a,0.26～0.3mm/a和0.85～1.02mm/a,可以与藏东-滇西高原周缘及邻区的盆地沉积记录相对应.研究结果为探讨藏东-滇西高原晚中新世以来的构造抬升-伸展变形提供了定量的参照时限.Abstract: The nine-apatite fission track ages of the granodiorite samples from a vertical profile in Dulong River region, where the intensively tectonic transition of the plateau occurs from east Tibet to west Yunnan, range from 4 to 6. 8Ma. The fission track analyses show that these samples are under the exhumed partial annealing zone and the apparent ages obtained are cooling ages with part mixed ages. The thermal history reveals there are at least three prominent cooling phases recorded by rock samples since Late Miocene time. The earlier deduced forward is at about 13 - 8Ma; the middle and the later are at about 5.5Ma and 2. 8Ma respectively, which are consistent with the timing of the regional unconformities. The denudation rates obtained from cooling history of these three phases are about 0. 10 - 0. 12mm/a, 0. 26 - 0. 3mm/a and 0. 85 - 1.02mm/a, indicating that the denudation processes are coincident with the sedimentary records in the basins developed around the margin of the southeastern Tibetan-northwestern Yunnan Plateau and adjacent areas. These results can provide quantitative timing reference to probe into the deformation of tectonic uplifting/extension the southern Tibetan-northern Yunnan plateau since Late Miocene time.
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Key words:
- Fission track /
- Uplift /
- Denudation /
- Late Miocene /
- Dulong River
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