南海晚更新世以来火山玻璃分布特征与物源分析  

Distribution Characteristics of Volcanic Glass in South China Sea Since Late Pleistocene and Their Provenance

作　　者：李学杰 田成静 钟和贤 张江勇 廖志良 Li Xuejie;Tian Chengjing;Zhong Hexian;Zhang Jiangyong;Liao Zhiliang(Guangzhou Marine Geological Survey/Key Laboratory of Marine Mineral Resources,MNR,Guangzhou 511400,China)

机构地区：[1]中国地质调查局广州海洋地质调查局/自然资源部海底矿产资源重点实验室,广州511400

出　　处：《吉林大学学报(地球科学版)》2025年第1期1-14,共14页Journal of Jilin University:Earth Science Edition

基　　金：中国地质调查局项目(1212011220116,1212011220117,DD20160138,GZH201300502,D20190378)。

摘　　要：南海东缘吕宋岛弧和南缘巽他—爪哇岛弧是重要的地震火山活动带,其大量火山玻璃成为南海主要沉积物来源之一。本文利用南海大量的柱状样,鉴定并统计火山玻璃体积分数,结合^(14)C测年和氧碳稳定同位素测定,分析其分布特征。结果表明:柱状样火山玻璃分布特征与表层沉积物样品类似,最高体积分数出现南海东部,并呈现往外扩散的特征;南海柱状样火山玻璃来源以菲律宾群岛为主,但晚更新世以来南海南缘的苏门答腊—爪哇岛弧火山地震带的影响比表层沉积大;南海东北部MIS1期火山玻璃体积分数比MIS2期高,可能表明吕宋岛弧北部MIS1期火山活动有所增强;南海北部陆架和陆坡区基本不含火山玻璃,表明北部的华南大陆近期缺乏强烈的火山活动,对南海近表层沉积基本没有影响。The Luzon Arc in the eastern margin and Sunda-Java Arc in the southern margin of the South China Sea(SCS)are important volcano-seismic belts,with their volcanic glass serving as the main sediment source in SCS.Volcanic glass was identified in a large number of columnar cores to analyze its distribution characteristics,supplemented by^(14)C dating and oxygen-carbon stable isotope determination.The results show that the distribution characteristics of columnar volcanic glass are similar to those of surface sediment samples,peaking in the eastern SCS and spreading outward,indicating the primary source is still the Philippine Islands.However,the volcanic provenances from the Sumatra-Java Arc volcano-seismic belt since Late Pleistocene exceed those from surface sediments.The volcanic glass content of MIS1 in the northeastern SCS is greater than in MIS2,suggesting enhanced volcanic activity of MIS1 in the northern Luzon Arc.The absence of volcanic glass in the northern shelf and slope area of the SCS indicates a lack of recent volcanic activity from the northern South China continent,exerting minimal influence on the near-surface sediments of SCS.

关 键 词：南海 火山玻璃 沉积作用 物源 火山地震带 ^(14)C测年 氧碳稳定同位素 

分 类 号：P618.13[天文地球—矿床学]