Late Cenozoic Geomorphology, Geochronology and Physiography of Yuntaishan in Southern Taihang Mountain, North China  

作　　者：WU Zhonghai ZHAO Xitao MA Yinsheng ZHAO Xun ZHAO Ting YANG Shouzheng GAO Linzhi 

机构地区：[1]Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China [2]Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China [3]Chinese Academy of Geological Sciences, Beijing 100037, China [4]Institute of mineral resources, Chinese Academy of Geological Sciences, Beijing 100037, China [5]The 2nd geological team, Henan bureau of geology and mineral resources, Jiaozuo 454002, China [6]Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

出　　处：《Acta Geologica Sinica(English Edition)》2010年第1期230-239,共10页地质学报（英文版）

基　　金：the work of "Study of the geo-scientific settings of geo-tourist landscapes in Yuntaishan World Geopark",and supported by the Department of International Cooperation of Ministry of Science and Technology of China. (Grant No. 2006DFA21320);the Science Foundation of institute of geomechanics, CAGS (Grant No. DZLXJK200706) ;the National Natural Science Foundation of China (Grant No. 40501006)

摘　　要：The late Cenozoic geomorphic features and geochronologic data of the Zhingfang River catchment in the Yuntaishan World Geopark are studied. Several quarternary geochronologic methods, including electron spin resonance （ESR）, optically stimulated luminescence （OSL）, thermo-luminescence （TL） and U-series are presented in this paper. The results suggest that there are two planation surfaces, named as the Taihang surface which is a peneplain of Taihang stage formed during Oligocene or Oligocene to early-middle Miocene period, and Tang-hien surface which is a mature wide valley of Tang-hien stage formed during late Miocene-Pliocene or Piiocene-early Pleistocene period and probably ended prior to 2.2-2.6 Ma based on ESR dating. After the Tang-hien stage, the incision and aggradation of the river formed six stream terraces with heights of 3-5 m, 8-12 m, 22-24 m, 28-38 m, 50-62 m and 80-85 m above the river bottom, respectively. The dating results of the alluvium sediments suggest that these terraces were formed during Holocene, 20-23 ka B.P., 110-120 ka B.P., 200-240 ka B.P., 840-1200 ka B.P. or ~450 ka B.P. and 1600-1800 ka B.P. or -1100 ka B.P., respectively. These results indicate that episodic incision of the river, which controls the formation of the scenery in the Yuntaishan World Geopark, was mainly influenced by the periodic dry-wet climate change during late Cenozoic mountain uplift.The late Cenozoic geomorphic features and geochronologic data of the Zhingfang River catchment in the Yuntaishan World Geopark are studied. Several quarternary geochronologic methods, including electron spin resonance （ESR）, optically stimulated luminescence （OSL）, thermo-luminescence （TL） and U-series are presented in this paper. The results suggest that there are two planation surfaces, named as the Taihang surface which is a peneplain of Taihang stage formed during Oligocene or Oligocene to early-middle Miocene period, and Tang-hien surface which is a mature wide valley of Tang-hien stage formed during late Miocene-Pliocene or Piiocene-early Pleistocene period and probably ended prior to 2.2-2.6 Ma based on ESR dating. After the Tang-hien stage, the incision and aggradation of the river formed six stream terraces with heights of 3-5 m, 8-12 m, 22-24 m, 28-38 m, 50-62 m and 80-85 m above the river bottom, respectively. The dating results of the alluvium sediments suggest that these terraces were formed during Holocene, 20-23 ka B.P., 110-120 ka B.P., 200-240 ka B.P., 840-1200 ka B.P. or ~450 ka B.P. and 1600-1800 ka B.P. or -1100 ka B.P., respectively. These results indicate that episodic incision of the river, which controls the formation of the scenery in the Yuntaishan World Geopark, was mainly influenced by the periodic dry-wet climate change during late Cenozoic mountain uplift.

关 键 词：GEOMORPHOLOGY GEOCHRONOLOGY planation surface river terrace late Cenozoic southern Taihang Mountains North China 

分 类 号：P534.6[天文地球—古生物学与地层学] Q949.9[天文地球—地质学]