华南衡阳盆地上白垩统黄土类似物的初步研究  

Preliminary study of Late Cretaceous loess-like sediments in the Hengyang basin,South China

作　　者：石宇翔 吴驰华[2,3] 黄乐清 伊海生 李智武[2,3] 焦海菁 杨嘉宝[7] 秦江颖 张小凤 周亚楠 Juan Pedro RODRIGUEZ-LOPEZ SHI Yuxiang;WU Chihua;HUANG Leqing;YI Haisheng;LI Zhiwu;JIAO Haijing;YANG Jiabao;QIN Jiangying;ZHANG Xiaofeng;ZHOU Yanan;Juan Pedro RODRIGUEZ-LOPEZ(College of Earth Sciences,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu,Sichuan 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Geological Survey Institute of Hunan Province,Changsha,Hunan 410116,China;Institute of Geological Survey of China University of Geosciences(Wuhan),Wuhan,Hubei 430074,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai,Guangzhou 519082,China;Research Institute No.280,CNNC,Guanghan,Sichuan 618300,China;Department of Geology,Faculty of Science and Technology,University of the Basque Country 37(UPV/EHU),Ap.644,E-48080 Bilbao,Spain;Permafrost Laboratory,Department of Geography,University of Sussex,Brighton BN19QJ,UK)

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]成都理工大学沉积地质研究院,四川成都610059 [3]油气藏地质及开发工程全国重点实验室,四川成都610059 [4]湖南省地质调查所,湖南长沙410116 [5]中国地质大学(武汉)地质调查研究院,湖北武汉430074 [6]南方海洋科学与工程广东实验室(珠海),广东珠海519082 [7]中国核工业集团有限公司核工业二八○研究所,四川广汉618300 [8]西班牙巴斯克大学科学技术学院地质系,毕尔巴鄂,E-48080,西班牙 [9]苏克萨斯大学地理系永久冻土实验室,布莱顿,BN19QJ,英国

出　　处：《地质学报》2023年第9期3101-3115,共15页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号41872099,42230310,41602127);湖南省自然科学基金项目(编号2021JJ30388);湖北省重点实验室开放基金项目(编号PEL-202203)联合资助的成果。

摘　　要：中国新生代黄土序列具有沉积速率高、连续性好等特点,记录了东亚地区持续的古气候动力学演化和重大地质事件信息。受区域构造-地貌和大气环流格局影响,中生代晚期华南发育了众多盆山型古沙漠系统且出露了巨厚的风成砂,但几乎未有学者提及黄土/黄土类似物的存在。本文通过粒度端元解析、野外露头的构型分析等手段,对衡阳盆地上白垩统红花套组进行了初步研究,识别出风成砂丘、砂席和泥滩等环境类型;并在泥滩环境中提取到黄土类似物的粒度组分信号,同时提出了黄土类似物的风成成因,总结了其形成-堆积过程。这项工作旨在探索白垩纪黄土类似物存在的可能性,为未来开展华南陆块中生代风尘记录研究提供契机。The Cenozoic loess sequence in China is characterized by high sedimentation rates and continuity,which record the continuous paleoclimatic dynamics and significant geological events in East Asia,leading to a series of cutting-edge scientific questions that have received widespread attention on a global scale.Influenced by regional tectonic-geomorphic processes and atmospheric circulation patterns,numerous basin-mountain desert systems with extensive windblown sand formations developed in southern China during the Late Mesozoic.However,little attention has been given to the existence of loess or loess-like deposits in these areas.In this study,the Upper Cretaceous Honghuatao Formation in the Hengyang basin was preliminarily investigated using grain size end-member analysis and field exposure configuration analysis.Environmental types including aeolian dunes,sand sheets,and mud flats were identified.Additionally,grain size components resembling loess were extracted from the mudflat environment.The study proposes aeolian origin for these loess-like deposits and summarizes their formation and accumulation processes.This work aims to explore the possibility of loess-like deposits during the Cretaceous period,providing insights for future studies on dust records in the Mesozoic southern China.

关 键 词：上白垩统 衡阳盆地 红花套组 风成沉积 黄土类似物 

分 类 号：P532[天文地球—古生物学与地层学] P534.53[天文地球—地质学]