滇西南沧源岩溶洞穴硝洞堆积物来源分析  

Sources of karst cave deposits in Xiaodong Cave in Cangyuan,Southwest Yunnan

作　　者：石林 杨青[1,2] 刘连文 张晋[4] 郑妍[5] 张俞[1] 杨万书 邹梓宁 郑洪波 SHI Lin;YANG Qing;LIU Lianwen;ZHANG Jin;ZHENG Yan;ZHANG Yu;YANG Wanshu;ZOU Zining;ZHENG Hongbo(Yunnan Key Laboratory of Earth System Science,Yunnan University,Kunming 650500,China;Yunnan Provincial Key Laboratory of Digital Humanities Technology Research and Development and Application,School of History and Archives,Yunnan University,Kunming 650032,China;School of Earth Sciences and Engineering.Nanjing University,Nanjing 210023,China;Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China)

机构地区：[1]云南大学云南省地球系统科学重点实验室,昆明650500 [2]云南大学云南省教育厅数字人文技术研发与应用重点实验室,云南大学历史与档案学院,昆明650032 [3]南京大学地球科学与工程学院,南京210023 [4]中国科学院海洋研究所,青岛266071 [5]中国科学院古脊椎动物与古人类研究所,北京100044

出　　处：《海洋地质与第四纪地质》2024年第2期81-96,共16页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目“青藏高原东南缘晚更新世以来地球关键带演化过程”(42361144879);“青藏高原及周缘新生代大陆风化沉积记录研究”(41991323);青藏高原第二次综合科学考察研究任务七“高原生长与演化”专题四“碰撞以来古地理格局与构造地貌过程”(2019QZKK0704);云南省科技领军人才项目“建设云南省地球系统科学重点实验室”(202005AB160008);云南省基础研究计划项目重点项目“滇西南晚更新世和平文化人类植物利用及环境适应性”(202301BF070001-005);兴滇英才支持计划“滇西史前人类植物资源利用及其环境适应性”;Queensland-Chinese Academy of Sciences Collaborative Science Fund“Past Asian-Australian MonsoonVariability”(QCAS036,045GJHZ2023001MI)。

摘　　要：岩溶洞穴是第四纪时期古人类活动的重要场所。开展岩溶洞穴碎屑沉积物的沉积特征及物质来源分析,对其沉积环境演变历史及古人类活动研究都具有重要意义。本文在了解硝洞洞穴及其周围不同沉积物黏土矿物特征的基础上,结合硝洞洞穴沉积物的粒度和矿物学等特征对其物质来源进行了分析。结果表明:硝洞洞穴沉积物的主要来源为洞穴外地表较高处的沉积物,其通过片流作用被带入洞穴内进行堆积。其次,还同时堆积有少量灰岩不溶性物质及其经历进一步风化成壤作用后形成的物质,总体可能存在4次进一步的风化成壤作用。此外,也有洞壁崩塌的石灰岩角砾和岩块参与堆积,总体存在4次大量灰岩角砾或岩块参与堆积过程,而最近一次的堆积作用,显然受到了人类活动的影响。Karst caves are valuable locations for studying prehistoric human activities during the Quaternary Period.Analyzing the depositional characteristics and provenance of clastic deposits in karst caves is crucial for understanding the evolutionary history of the depositional environment and shedding light on past human behaviors.Xiaodong Cave in Cangyuan,Southwest Yunnan was studied to unveil the source of clastic sediments.The grain size and mineralogical features of various clay minerals within and around the cave were analyzed.Results show that the cave sediments came mainly from the sediments in higher places outside the cave through sheet flow as shown in grain size characteristics.In addition,a small amount of insoluble material from limestone and materials formed after further weathering and pedogenesis were also accumulated.Overall,there might be four periods of further weathering and pedogenesis.Moreover,there were limestone breccias and rock debris fallen off from cave walls,from which four events of accumulation of limestone breccia or debris were recognized.The latest accumulation was obviously affected by human activities,to which sufficient attention should be paid in research works.

关 键 词：岩溶洞穴堆积 堆积物来源 粒度 黏土矿物 

分 类 号：P534.63[天文地球—第四纪地质学]