| 太行山中段羊角玄武岩形态特征及其地质意义 |
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| 关键词:Taihang Mountains basalt topographic surface terrace “U” valley uplift erosion |
| 基金项目:中国地质调查局项目(编号: 1212010511508) |
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| Morphologic Characteristics of Yangjiao Basalt in the Middle Taihang Mountains and Their Geological Significance |
| The uplift events have been recorded by the basalt around Yangjiao Town of Zuoquan County in middle Taihang Mountains since the end of Pliocene. Based on field investigation, the authors studied the morphologic characteristics of the basalt and the related topographic surface, and detected that the basalt was formed between the end of Pliocene and the beginning of Early Pleistocene. The geomorphic evolution of the middle Taihang Mountains since Late Pliocene is as follows: in Late Pliocene, this area underwent two phases of geomorphic evolution, i.e., uplift and erosion, and this led to the formation of the “U” valley; at the end of Pliocene, because of the repeated and intermittent eruption of the basalt and the uplift of the geomorphic surface of the middle Taihang Mountains centered at Wujiaping Village, the basalt filled the “U” valley, and then the geomorphic surface of the fourth terrace was formed through erosion and accumulation; in Early Pleistocene, the geomorphic surface of the middle Taihang Mountains was uplifted so that the fourth step terrace was formed. At the end of Middle Pleisto-cene, the third terrace was formed; Since Late Pleistocene, two times of uplifting of the geomorphic surface took place, and hence all of the four steps of terraces came into being on the basalt. It is shown that the uplift of the middle Taihang Mountains occurred mainly between the end of Pliocene and Early Pleistocene. This cognition of-fers material evidence for the uplift of the middle Taihang Mountains since Late Pliocene. |
| GONG Ming-quan,MA Yin-sheng,ZHAO Xi-tao,SHI Wei,DU Jian-jun.2010.Morphologic Characteristics of Yangjiao Basalt in the Middle Taihang Mountains and Their Geological Significance[J].Acta Geoscientica Sinica,31(1):56-64. |
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