海洋地质与第四纪地质2025，Vol.45Issue(2)：177-188,12.DOI:10.16562/j.cnki.0256-1492.2024010901
柴达木盆地西北部中新世矿物学特征及其古气候意义
Mineralogical characteristics and paleoclimatic significance of the Miocene deposit in the northwestern Qaidam Basin
摘要
Abstract
The Middle Miocene Climatic Optimum(MMCO)is a short-term climate warming event interrupting the background of Cenozoic climate cooling.Study on the environmental characteristics based on sediments is important for predicting the trend of climate change with the global warming in the future.There are few records of the MMCO in the extreme arid interior of Asia,and the controlling factors of paleoclimate changes are still unclear.The mineral assemblages of the Miocene sediments from the Huatugou section in the northern Qaidam Basin were analyzed,the regional response to the global climate event and the environmental change in the Qaidam Basin during early-middle Miocene were revealed,and the paleoclimate evolution including the shifting and driving mechanisms of relative moisture index of clay minerals were focused.Results show that during the early-middle Miocene in Qaidam Basin,the climate during 17.2～15.2 Ma was the warmest and wettest,which should belong to the MMCO and mainly affected by the global climate.The climate in the basin began to fluctuate and became dried during 15.2～12.4 Ma.The basin was affected by the regional geological structure and the Middle Miocene cooling event.From 12.4 to 11.3 Ma,Qaidam Basin continued to dry out,mainly under the influence of global climate again.We pointed out that the global climate change trend and regional tectonic movement influenced the early and middle Miocene climate in Qaidam Basin.关键词
矿物组合/构造运动/古气候/中新世/柴达木盆地Key words
mineral assemblage/tectonic movement/paleoclimate/Miocene/Qaidam Basin分类
天文与地球科学引用本文复制引用
秦秀玲,常宏,关冲..柴达木盆地西北部中新世矿物学特征及其古气候意义[J].海洋地质与第四纪地质,2025,45(2):177-188,12.基金项目
国家自然科学基金项目"塔里木盆地钻孔岩芯记录的上新世气候变化特征及其影响因素"(42372221) （42372221）
第二次青藏高原综合科学考察项目"高原风化剥蚀历史及气候环境效应"(2019QZKK0707) （2019QZKK0707）
黄土与第四纪地质国家重点实验室开放基金资助项目"柴达木盆地中中新世大暖期沉积序列的黏土矿物学研究"(SKLLQG2121) （SKLLQG2121）
