摘要
对深圳湾北岸新民钻孔岩心沉积物中铁、钒元素、矿物鉴定的伊利石以及生物指标贝类介壳揭示的环境特征资料进行了分析，研究初步表明，该钻孔岩心沉积物理深12．12～10．91m层段的杂色花斑粘土中存有晚更新世晚期至早全新世气候波动的记录。钒元素和伊利石分析也得到了相应的证实。所记录的短期降温和升温事件可能表明，在第四纪末次冰期-冰消期中，气候曾强烈波动，并逐渐由晚冰期向冰后期过渡。这对研究晚武木冰期最低海面时期以来，海面回升及晚更新世晚期／早全新世的古环境方气候影响提供有价值的资料。
Xinmin core is located at the northwest part of Shenzhen County in Guangdong Province and is 1. 5 km apart from the sea coast. About 30. 6 m-long core was taken in 1997~ 1998 to study environment evolution of the area.According to records of iron and vanadium elements,illite and shell fossils of shellfish in sediments from Xinmin core, climatic records are found in the sediments at a buried depth of 12. 12~10. 91 m of the core,whose graphophyric clay in mixed colors shows a climatic fluctuation from late Pleistocene to early Holocene. FeO distribution curve presents a peak value, but Fe2O3 distribution curve presents a valley at 12. 12 ~ 11. 69 m depth. This suggests that seawater area expanded and the sedimentary environment was in strong reduction during the period and that climate tended to be turning from cool to warm after the last glacial maximum- FeO distribution curve shows a low valley value and Fe2O3distribution curve a peak value at 11. 64~ 10. 91 m depth,indicating that the environment of sedimentation was in strong oxidation and climate may be shortly warm-dry. The analysis results of vanadiurn element and illite prove the conclusion,too.The climatic records of temperature changes for a short period suggest that the climate fluctuated strongly durlng the period of the last deglaciation of Quaternary and it gradually went from the late glacial to postglacial period- This paper may provide useful information for studying sea level rising again since lowest sea level period in Wurm glaciation and paleoenvironmental and paleoclimatic evolutions of late stage of late Pleistocene early Holocene.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1999年第4期109-113,共5页
Marine Geology & Quaternary Geology
基金
国家自然科学基金!49672138
