A Study on the Genetic Dynamics and Development Characteristics of Granitic Rock Avalanches in the Northern Qinling Mountains,China  

作　　者：Yan Lyu Ruixia Ma Zuopeng Wang Jianbing Peng Tianzhuo Gu 

机构地区：[1]College of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,China [2]School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China [3]Institute of Geosafety,China University of Geosciences(Beijing),Beijing 100083,China

出　　处：《Journal of Earth Science》2025年第2期737-749,共13页地球科学学刊(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Nos.42207197,42293355,41672285,42293350,42341101);the Fundamental Research Funds for the Central Universities(Nos.300102264917,300102262908,590123008)。

摘　　要：Massive granitic rock avalanches are extensively developed in the middle section of the northern Qinling Mountains(NQM),China.The current consensus is that their formation could have been connected with seismic events that occurred in the NQM.However,there is a lack of systematic discussion on the genetic dynamics of these rock avalanches.Hence,taking Earth system scientific research as a starting point,this paper systematically summarizes and discusses development characteristics,formation times and genetic dynamic mechanisms of granitic rock avalanches in the NQM based on geological investigations,high-precision remote sensing interpretations,geomorphological dating,geophysical exploration,and a large-scale shaking table model test.We identified 53 granitic rock avalanches in this area,with a single collapse area ranging from 0.01×10~6 to 1.71×10~6 m^(2).Their development time can be divided into six stages,namely,107000 years BP,11870–11950 years BP,11000 years BP,2300 years BP,1800 years BP,and 1500 years BP,which were closely related to multiple prehistoric or ancient earthquakes.We suggest that long-term coupling of internal and external earth dynamics was responsible for the granitic rock avalanches in the NQM;the internal dynamics were mainly related to subduction,collision and extrusion of different plates under the Qinling terrane,leading to the formation and tectonic uplift of the Qinling orogenic belt;and the external dynamics were closely associated with climate changes resulting in mountain denudation,freeze-thaw cycles and isostatic balance uplift.In this process,the formation and evolution of the Qinling orogenic belt play a geohazard-pregnant role,structural planes,including faults and joints,play a geohazard-controlled role,and earthquakes play a geohazard-induced role,which jointly results in the occurrence of large-scale granitic rock avalanches in the NQM.This research can not only decipher the genetic dynamic mechanism of large hard granitic rock avalanches but also reveal temporal and s

关 键 词：granitic rock avalanche genetic dynamic mechanism earth system science Qinling Mountains PETROLOGY 

分 类 号：P642.2[天文地球—工程地质学]