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Table · dataset · 2026

<b>Supporting Information for Characteristics of the river sediments originating from the Zhangguangcai Ridge, NE China and Their Geological Significance</b>

Listed in ZivaHub and Deakin Research Online and DMU Figshare and HKU DataHub and Swinburne Figshare and DaYta Ya Rona and SUNScholarData and figshare and Loughborough Research Repository and GRANTS Data and UP Research Data Repository — shown once because both records carry DOI 10.6084/m9.figshare.34036647.v1

Description

<p dir="ltr">河流沉积物因其对环境变化和快速物质更替的敏感响应,尤其是中小型河流(如中国东北松花江支流)是解读源汇过程和区域地质演化的重要档案。本研究聚焦于松花江四条支流的河流沉积物:阿诗河(AR)、拉林河(LR)、马义河(MYR)和牡丹河(MDR)。对这些河流沉积物进行了粘土矿物、地球化学、重矿物及碎屑锆石U-Pb地质年代学分析,以阐明其来源特征和风化过程。沉积物中的粘土矿物组合以伊利石为主(41.2%–64.5%),其次是高岭土和蒙脱石。伊利石-蒙脱石混层矿物的广泛分布表明源区化学蚀变有限且化学风化作用较弱。粉砂组分(<63微米)的地球化学成分在母岩中表现出长英质特征,但粘土组分(<2微米)则不表现出类似特征。与粘土组分相比,粉砂组分表现出较低的成熟度和更少的回收特征。值得注意的是,粉砂和粘土组分反映了明显不同的化学风化程度。粉砂分数的化学变质指数(CIA)值表明化学风化程度较低(51-60)。相比之下,粒径修正后的粉砂分数和粘土分数分别为81–86和67–87,表明存在中度至强烈的化学风化。因此,研究区河流沉积物中未校正的粉砂比例比粘土分数更能准确反映源区化学风化强度。AR的重矿物组合主要由绿帘石组成(62.26%),而LR和MYR主要由角闪石组成(分别为71.35%和55.48%)。MDR磁铁矿含量相对较高(8.3%–24.52%),反映了源岩性的不同。AR、LR和MYR碎屑锆石U-Pb年龄谱的主要峰值出现在2亿至180百万马万年前,表明中生代张光彩脊火成岩的贡献。相比之下,MDR显示晚元古代-寒武纪(6亿至5亿马万年前)、二叠纪(2亿6千万至2亿5千万马万)和中生代(约1亿8千万马万)的多个年龄峰值,暗示张光彩岭和嘉慕西区块的混合源头。AR、MYR和MDR的碎屑锆石年龄分布显示出其源区岩浆锆石广义年龄特征的相对较高的可重复性。此外,碎屑锆石年龄分布的低频循环比高频循环更有效地再现源岩浆锆石的特性。相比之下,拉林河的沉积物具有特别低的重复性,这归因于混合源材的影响。本研究完善了中国东北河流沉积物的多代理分析方法,强调颗粒粒径分离在区分风化和来源信号中的关键作用,并为该地区盆地-山耦合系统内源汇连锁和区域地质演化提供了重要约束。</p>

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Provenance · 11 source records, 79 field assertions
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DMU Figshareoai:figshare.com:article/340366475 d agoJSON v1
HKU DataHuboai:figshare.com:article/340366475 d agoJSON v1
Swinburne Figshareoai:figshare.com:article/340366475 d agoJSON v1
DaYta Ya Ronaoai:figshare.com:article/340366475 d agoJSON v1
SUNScholarDataoai:figshare.com:article/340366475 d agoJSON v1
figshareoai:figshare.com:article/340366474 d agoJSON v1
Loughborough Research Repositoryoai:figshare.com:article/340366474 d agoJSON v1
GRANTS Dataoai:figshare.com:article/340366474 d agoJSON v1
UP Research Data Repositoryoai:figshare.com:article/340366474 d agoJSON v1
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