松嫩平原齐齐哈尔地区拜泉县地表基质特征及其古环境恢复
Sedimentary characteristics analysis and paleoenvironmental restoration of the ground substrate in Baiquan County,Qiqihar area,Songnen Plain
邵兴坤 1侯红星 1任柄璋 1时凌峰 1詹泽东 1西广越 1李俊华 1曹龙宇 1高远1
作者信息
- 1. 中国地质调查局廊坊自然资源综合调查中心,河北廊坊 065000
- 折叠
摘要
地表基质是自然资源管理的全新概念,是支撑孕育各类自然资源的基础物质.加强地表基质沉积环境分析和古环境恢复对研究其形成机制具有重要意义.通过对松嫩平原拜泉地区 50m以浅地表基质沉积特征和沉积环境剖析,并结合全芯粘土矿物、碳酸盐、磁化率、碳元素数据分析,认为研究区垂向上分布了 16 层土质基质,由深至浅呈现湖相沉积→陆域风成相→草甸相过渡沉积演化特点,深层湖相沉积具有滨湖相沉积、堤岸相沉积、滨湖相多旋回沉积特点;其中深层滨湖相和堤岸相沉积物形成于寒冷极干燥环境,中深层湖相沉积物形成于温暖湿润环境,浅表层草甸相和风成相沉积物形成于较干冷环境.综合前人资料和14C、光释光、ESR测年结果,将研究区沉积演化阶段划分为早更新世晚期—中更新世早期干冷沉积阶段、中更新世中晚期温暖的湖相沉积阶段、晚更新世—早全新世风成黄土沉积阶段、中晚全新世以来黑土沉积阶段.
Abstract
Ground substrate is a new concept in natural resource management,which is the fundamental material supporting the breeding of various natural resources.Strengthening the analysis of ground substrate sedimentary environment and the restoration of paleoenvironment is of great significance for studying its formation mechanism.This article analyzes the sedimentary characteristics and the sedimentary environment of a 50 m shallow ground substrate,based on the data of full core clay minerals,carbonates,magnetic susceptibility,and carbon elements.The research results indicate that there are 16 layers of soil substrate vertically distributed in the study area,exhibiting a transitional sedimentary evolution from deep to shallow,characterized by lacustrine sedimentation →continental eolian facies→meadow facies.The deep lakeside facies and embankment sediments are formed in cold and extremely dry environments,the middle deep lake sediments are formed in warm and humid environments,and the shallow surface meadow and aeolian sediments are formed in relatively dry and cold environments.Based on previous data and 14C,photoluminescence and ESR dating results,the sedimentary evolution stage of the study area is divided into the late Early Pleistocene to early Middle Pleistocene dry cold sedimentary stage,the warm lacustrine sedimentary stage in the middle and late Middle Pleistocene,the Late Pleistocene to Early Holocene eolian loess sedimentary stage and the black soil sedimentary stage in the Middle and Late Holocene.
关键词
松嫩平原/地表基质/拜泉地区/沉积环境/古环境恢复Key words
Songnen Plain/ground substrate/Baiquan area/sedimentary environment/paleoenvironmental restoration引用本文复制引用
基金项目
中国地质调查局项目(DD20220855)
出版年
2024
国家科技期刊平台
NSTL
万方数据