摘要
渤海的碎屑物质详细记录了源区的地质信息,对其进行物源示踪研究有助于提高我们对周围造山带及黄河的演化、中国东部陆架海碎屑物质扩散等的认识。本文利用激光剥蚀电感耦合等离子质谱分别对辽东湾、渤海湾及莱州湾周围主要汇入河流的碎屑磷灰石进行原位微量元素分析,结合Kolmogorov-Smirnov统计方法的多维判别图与反向传播神经网络等方法,分析渤海主要汇入河流碎屑磷灰石的微量元素与稀土元素。结果表明在汇入渤海的主要河流中,碎屑磷灰石的微量元素主要以Sr元素与Y元素为主,且都出现较为明显的HREE富集,但在不同河流之间的碎屑磷灰石Sr元素与REE也存在一定差异,这可能与其母岩不同相关。
To trace where the detrital deposits of the Bohai Sea come from is important for better understanding the basin-mountain coupling and the formation of the Yellow River,in addition to the distribution of the detrital sediments around the Bohai Sea.In this paper,the laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS)is applied to analyze the composition of trace elements of the detrital apatite grains from the main rivers pouring into Liaodong Bay,Bohai Bay,and Laizhou Bay,combining with Kolmogorov-Smirnov multidimensional discrimination diagram(MDS)and Back Propagation(BP)neural network to perform sediment provenance discrimination.Results show that they are all characterized by high Sr,Y and light rare earth elements(LREE).However,there are some differences in the sediments from different rivers,which may be related to the source rocks of apatite.
作者
刘海金
龚志军
林旭
LIU Haijin;GONG Zhijun;LIN Xu(School of Earth Sciences,East China University of Technology,Nanchang 330013,China;College of Civil Engineering and Architecture,Three Gorges University,Yichang 443002,China)
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2021年第4期74-86,共13页
Marine Geology & Quaternary Geology
基金
国家自然科学基金“青海南山新生代隆升与黄河龙羊峡下切时间的低温热年代学研究”(41702178),“青藏高原东北缘兰州盆地新生代盆-山耦合和黄河水系演化研究”(41972212)
湖南省自然科学基金“江汉盆地物源示踪研究”(2019JJ40198)。
关键词
磷灰石
微量元素
物源示踪
渤海
apatite
trace element
provenance tracing
Bohai Sea
