渤海主要汇入河流碎屑磷灰石地球化学特征及成因

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。

Geochemical characteristics and genesis of detrital apatites from the surrounding rivers into the Bohai Sea

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 multi-dimensional 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.