地质科学2026，Vol.61Issue(4)：1066-1074,9.DOI:10.12017/dzkx.2026.071
考虑压实作用并基于14C年龄评估原始沉积速率
Assessment of initial sedimentation rates based on 14C ages with compaction correction
摘要
Abstract
The age and thickness of Quaternary sediments are critical for assessing original sedimentation rates and reconstructing paleoenvironmental changes.However,compaction-induced thickness distortion can reduce the accuracy of such assessments.This study integrates 14C and optically stimulated luminescence(OSL)dating,borehole data,and geotechnical parameters to estimate sediment ages and correct deposition thickness by calculating compaction-induced thickness differences,thereby reevaluating the original sedimentation rates.The study reveals that the original sedimentation rates in this region have shown fluctuations since the Holocene.Three peaks were identified in the Early Holocene(10.01±0.39 ka),early Middle Holocene(8.03±0.41 ka),and late Middle Holocene(6.14±0.26 ka)with sedimentation rates of 743.6 mm/100 a,948.1 mm/100 a,and 2 369.6 mm/100 a,respectively.This indicates that the Shengze area has experienced at least three significant episodes of vertical crustal movement since the Holocene,with increasing rates and magnitudes of movement.Sedimentation rates can partly reflect the intensity of regional geological processes.The two major sedimentation rate peaks correspond to transgression events during the Early Holocene(11.7～10 ka)and the Mid-Holocene(6 ka).These findings highlight the importance of incorporating compaction effects in reconstructing original sedimentation rates for studies of crustal vertical movement and regional geological history.关键词
沉积速率/原始沉积速率/14C年龄/压实作用/沉积环境/海进海退Key words
Sedimentation rates/Original sedimentation rate/14C age/Compaction/Sedimentary environment/Transgression and regression分类
天文与地球科学引用本文复制引用
罗朋志,徐智,张国林,毛绪美..考虑压实作用并基于14C年龄评估原始沉积速率[J].地质科学,2026,61(4):1066-1074,9.基金项目
国家自然科学基金项目(编号:41440027)和中化地质矿山总局云南院专项科技项目(编号:ZHDKYN-2025-01)资助 （编号:41440027）
