热带地理

TROPICAL GEOGRAPHY ›› 2017, Vol. 37 ›› Issue (1): 66-81.doi: 10.13284/j.cnki.rddl.002915

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Formation and Evolution of the Granite Landscapes in Wuhuangshan National Geopark，Pubei，Guangxi

WEI Yuelong1，WANG Guozhi2，CHEN Weihai1，LUO Shuwen1，LUO Qukan1   

  1. （1．Institute of Karst Geology，Chinese Academy of Geological Sciences，Guilin 541004，China； 2．College Of Earth Sciences，Chengdu University of Technology，Chengdu 610059，China）
  • Online:2017-01-05 Published:2017-01-05

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Abstract:

Wuhuangshan Geopark which has been developed in the Pubei pluton is the typical observation point of the Darongshan-Shiwandashan granitoid belt and S-type granite. The granite landscapes in the Geopark are generally classified into five categories: spheroidal stone, mountains, platform, gorge, and hydrological heritage. All of them have been distributed orderly and intensively in the different zones of the granite mountains that are relative independent, and showed obvious vertical differentiation features. These granite landscapes constitute a typical, majestic, beautiful and precious south subtropical granite landscape group and spheroidal stone group with spheroidal stone landscape at the core and mountains, platform, pools group and waterfall group as the important complement. Based on the analysis and investigation about the regional geologic background of the geopark and the characteristics of the granite pluton, this paper systematically studies and discusses the formation and evolution of the granite pluton and the granite landscapes in the geopark. Some main conclusions held by the authors are as follows: 1) During Middle Triassic, there was large-scale magmatic activity in this region, then a giant granite batholith with the continuous time and the integrity of formation, namely, Pubei pluton was gradually formed after a series of processes, i.e. magma emplacement, differentiation, cooling crystallization; and then this pluton was uplifted, denuded and exposed to the earth’s surface to form mountains. 2) Since Quaternary, controlled jointly by humid-warm climate, surface water and granite pluton in which primary and epigenetic joints developed well, the ability to converge all forms of surface water has been gradually increased from mountaintop→mountainside→foothill, the corresponding erosion has been gradually increased but weathering has been gradually weaken from mountaintop→mountainside→foothill. After going through the process of horizontally–vertically differently erosion, washout and weathering during the long geological period, the typical south subtropical granite landscape group in the geopark has been gradually formed.

Key words: Pubei pluton, spheroidal stone landscape, granite landscape, Wuhuangshan National Geopark