sources of cave drip water, time scales of drip water re- sponding to precipitation, and processes of water dynamics in four caves of Pearl watershed in Guizhou, China (Liang- feng cave in Libo, Qixing cave in Duyun, ...sources of cave drip water, time scales of drip water re- sponding to precipitation, and processes of water dynamics in four caves of Pearl watershed in Guizhou, China (Liang- feng cave in Libo, Qixing cave in Duyun, Jiangjun cave in Anshun and Xiniu cave in Zhenning). Because of the variety of karst cave surroundings, interconnections of water trans- porting ways, water dynamics processes etc., time scales of drip-water in four caves responding to rainfall is 0—40 d. According to the characteristics of water transport in cave roof, pathways of water movement, types of water head etc., drip water of four caves can be divided into five hydrody- namics types. The differences of time scales, and ways of water-soil and water-rock interaction during water trans- porting in cave roof make it difficult to correctly measure speleothem record and trace material sources. In addition, there exist great differences in water dynamic conditions among the four caves. So the interpretation of the paleoenvi- ronment records of speleothem must be supported by the understanding of hydrodynamics conditions of different drip sites. Based on the data got from drip sites in four caves, drip conductivity accords with precipitation, which indicates that element contents in speleothem formed by drip water record the change of karst paleoenvironment. But results of multi-points study are needed to guarantee the correctness of interpretation.展开更多
基金This work was supported by the Key Project of the Knowledge Innovation Engineering of the Geochemistry Institute of Chinese Academy of Sciences and the National Nalural Science Foundation of China(Grant No.90202003).
文摘sources of cave drip water, time scales of drip water re- sponding to precipitation, and processes of water dynamics in four caves of Pearl watershed in Guizhou, China (Liang- feng cave in Libo, Qixing cave in Duyun, Jiangjun cave in Anshun and Xiniu cave in Zhenning). Because of the variety of karst cave surroundings, interconnections of water trans- porting ways, water dynamics processes etc., time scales of drip-water in four caves responding to rainfall is 0—40 d. According to the characteristics of water transport in cave roof, pathways of water movement, types of water head etc., drip water of four caves can be divided into five hydrody- namics types. The differences of time scales, and ways of water-soil and water-rock interaction during water trans- porting in cave roof make it difficult to correctly measure speleothem record and trace material sources. In addition, there exist great differences in water dynamic conditions among the four caves. So the interpretation of the paleoenvi- ronment records of speleothem must be supported by the understanding of hydrodynamics conditions of different drip sites. Based on the data got from drip sites in four caves, drip conductivity accords with precipitation, which indicates that element contents in speleothem formed by drip water record the change of karst paleoenvironment. But results of multi-points study are needed to guarantee the correctness of interpretation.
