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首页> 外文期刊>Acta geologica Sinica: Journal of the Geological Society of China >Fission Track Dating of Authigenic Quartz in Red Weathering Crusts of Carbonate Rocks in Guizhou Province
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Fission Track Dating of Authigenic Quartz in Red Weathering Crusts of Carbonate Rocks in Guizhou Province

机译:贵州省碳酸盐岩红色风化壳自生石英的裂变径迹定年

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摘要

The Cenozoic evolution history of Guizhou Province, which is located on the southeastern flank of the Qinghai-Tibet Plateau, is unclear because of the lack of sedimentation records. The red weathering crusts widespread on the Yunnan-Guizhou Plateau may bear critical information about their evolution history. This work firstly determined the ages of four red weathering crusts in eastern, central and northern Guizhou. The material used in fission track dating is well-crystallized quartz occurring in many in-situ weathering crusts of carbonate rocks. The results showed that the fission track ages of quartz vary over a wide range from 1 to 25 Ma in the four profiles, significantly younger than the ages of the Triassic and Cambrian parent rocks. In combination with the evolution history of the regional geology during the period from 25 to 1 Ma, the ages of quartz can exclude the possibility that the origin of quartz has nothing to do with primary clastic minerals in parent rocks, authigenesis during diagenesis and hydrothermal precipitation or replacement by volcanic activities. It is deduced that the well-crystallized quartz was precipitated from Si-rich weathering fluids during the weathering process of carbonate rocks. The recorded ages of quartz from the four profiles are consistent with the episodes of the planation surfaces on the Qinghai-Tibet Plateau, the forming stages of red soil in the tropics of South China, the tectonically stable periods in Guizhou, and the ages of weathering in other parts of the world during the Cenozoic era. That is to say, the ages of authigenic quartz dated by the fission track method are well feasible and credible.
机译:由于缺乏沉积记录,位于青藏高原东南侧的贵州省新生代演化史尚不清楚。在云贵高原上广泛分布的红色风化壳可能具有有关其演化历史的重要信息。这项工作首先确定了贵州东部,中部和北部四个红色风化壳的年龄。裂变径迹测年中使用的材料是结晶良好的石英,存在于碳酸盐岩石的许多原位风化壳中。结果表明,在四个剖面中,石英的裂变径迹年龄在1至25 Ma的宽范围内变化,比三叠纪和寒武纪母岩的年龄显着年轻。结合25到1 Ma期间区域地质的演化历史,石英的年龄可以排除石英的起源与母岩中的原始碎屑矿物,成岩过程中的自生作用和热液降水无关的可能性。或被火山活动取代。可以推断,在碳酸盐岩的风化过程中,结晶良好的石英是从富含硅的风化流体中沉淀出来的。从这四个剖面记录的石英年龄与青藏高原的平坦面的事件,华南热带地区红壤的形成阶段,贵州的构造稳定时期以及风化年龄相一致。在新生代时代的世界其他地区。也就是说,通过裂变径迹法确定的自生石英年龄是可行和可靠的。

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