海洋地质与第四纪地质2025，Vol.45Issue(1)：79-92,中插1-中插3,17.DOI:10.16562/j.cnki.0256-1492.2024091801
浙闽入海河流重矿物组成自动识别及物源指示意义
Automatic identification of heavy mineral compositions in Zhejiang-Fujian rivers and implications for provenance analysis
摘要
Abstract
Heavy mineral composition in sediments is one of the primary analytical methods for provenance analysis.However,conventional manual identification of heavy minerals has problems such as large errors,small statistics,and poor repeatability,posing substantial challenges in revealing provenance characteristics and tracing sediment source and sink processes.Utilizing the TESCAN Integrated Mineral Analyzer(TIMA),we conducted heavy mineral analysis on 26 sediment samples from eight major coastal rivers in the Zhe-Min basin,including the Qiantang River,Jiaojiang River,Minjiang River,and so on.By comparing the results of manual identification and the geological background of the basin,the potential of TIMA heavy mineral analysis in provenance tracing was explored.A total of 209019 mineral grains were analyzed,and 36 different types of heavy minerals were distinguished.Compared with the manual identification methods,the identification results of the two methods for the main heavy mineral types and their relative content changes in the river are largely the same.However,TIMA takes less time,identifies more heavy minerals in quantity and types,and has good reproducibility of identification results.TIMA heavy mineral analysis results indicate that the main heavy mineral assemblages in the Zhe-Min basin included epidote group,amphibole group,and ferromagnetic metal minerals,of which zoisite is the predominant type and a typical heavy mineral of the basin.The amphibole group minerals are primarily composed of hornblende,followed by ferro-actinolite,with significant variations in content across different basin samples.The percentage of ferromagnetic metal minerals exceeds 40%in most samples,containing hematite,magnetite,limonite,titanium magnetite,and authigenic pyrite.Overall,the differences in exposed stratigraphic lithology in the northwestern Zhejiang,southeastern Zhejiang,northwestern Fujian,southwestern Fujian,and eastern Fujian areas reflect the distinct characteristics of the heavy mineral composition in Zhe-Min rivers.Principal component analysis showed that the higher positive loadings(＞0.88)of apatite,amphibole group,and xenotime are associated with the principal component(PC)1,suggesting that magmatic source rocks influenced the PC 1.Conversely,the higher positive loadings of schorl,garnet group,and chlorite associated with PC 2 indicate influence from metamorphic source rocks.This study demonstrates that it is more efficient to systematic research on heavy minerals from rivers to the sea using automated mineral identification methods like TIMA in the study of heavy minerals with high accuracy requirements.关键词
浙闽入海河流/重矿物组成/TIMA/主成分分析Key words
Zhejiang-Fujian rivers flowing into the sea/heavy mineral composition/TIMA/principal component analysis分类
海洋科学引用本文复制引用
崔育华,刘梦佳,黄湘通,杨守业,岳伟,赵希林,靳国栋..浙闽入海河流重矿物组成自动识别及物源指示意义[J].海洋地质与第四纪地质,2025,45(1):79-92,中插1-中插3,17.基金项目
中国地质调查局地质调查项目(DD20242972) （DD20242972）
国家自然科学基金面上项目"碎屑锆石U-Pb年代学定量解析东海陆架沙质沉积物源与源汇过程"(42176054) （42176054）
