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| Mineral Composition Characteristics of Calcareous Root Tubes in the Deserts of the Alxa Plateau, NW China |
| Li Zhuolun, Shao Konglan, Ning Kai, Wang Naiang, Cheng Hongyi |
| College of Earth and Environmental Sciences/Center for Climatic Change and Hydrologic Cycle in Arid Region, Lanzhou University, Lanzhou 730000, China |
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Abstract There is debate regarding the formation of calcareous root tubes and their environmental significance in Alxa Plateau. Analyzing the mineral composition of calcareous root tubes could provide new evidence for their formation and their environmental significance. Total of 33 calcareous root tubes and 33 surface aeolian sand samples were collected from the hinterland of the Badain Jaran Desert, the Tengger Desert and the Ulan Buh Desert, then the mineral composition were measured using X-ray diffraction. The results showed that calcareous root tubes contains silicate mineral, mineral oxides and hydroxides mineral, and carbonate mineral. Moreover, calcite is the main carbonate mineral. The mineral compositions were almost identical in different areas. Carbonate mineral percentages of calcareous root tubes is significant higher than aeolian sand. Hence, only groundwater recrystallization cannot explain the mineral composition of calcareous root tubes and the origin of carbonate mineral in this area. In addition, the present climate is not suit for the root calcification and calcareous root tubes formation, and then calcareous root tubes should be formed in the past and could indicate a relatively humid climatic conditions.
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Received: 19 August 2014
Published: 20 November 2015
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2015, Vol. 35 
