Paleoclimate Analyzing Based on Development Morphology of River System
Generally, development morphology of river system can indicate climate, the more humid climate was, the more complicated development morphology was, while fractal dimension can be used as a parameter for describing development morphology of river system. Based on this understanding, a climate-type identification chart and precipitation calculation model to analyze paleoclimate characteristics is presented in this paper. The climate-types identification chart described palaeoclimate based on the development morphology of river system, and the precipitation calculation model calculated palaeoclimate type and annual precipitation by the fractal data of the development morphology. Taking the Late Ordovician river system in Ordos Basin as an example, paleoclimate analysis results showed that the study area was in a humid paleoclimate, annual precipitation was about 2106 mm. This calculation results are consistent with the existing geological cognition. The climate-type identification chart and precipitation calculation model provide an easier and cheaper way of paleoclimate analyzing compared to paleomagnetism, sediment, and pollen analysis.
KeywordsPaleoclimate analysis Development morphology of river system Fractal characteristics Ordos basin
We thanks the staff of natural gas exploration department of Changqing Exploration and Development Institute; this study was financially supported by National Science and Technology Major Project “Resource Potential Assessment, Enrichment Regularity and Favorable Area Optimization of Tight Gas” under contract number No. 2016ZX05047001. Huang Daojun made many helpful comments.
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