基于XRF岩心扫描证据的福建木兰溪河口全新世沉积环境演化重建
宋震 , 李亚龙 , 赵云 , 高建华 , 印萍 , 杨守业
地球科学 ›› 2024, Vol. 49 ›› Issue (06) : 2213 -2226.
基于XRF岩心扫描证据的福建木兰溪河口全新世沉积环境演化重建
Holocene Depositional Environment Evolution at Mulanxi Estuary in Fujian Province: Evidences from XRF Core Scanning
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为精确刻画和揭示强潮控山溪性河流河口全新世的沉积环境演化特征和控制因素,本研究选取福建中部潮控型山溪性河流——木兰溪河口的钻孔(MLX-S)为研究对象,在运用放射性14C和光释光建立沉积年代框架基础上,开展了沉积物粒度、XRF岩心扫描及ICP-OES元素分析.研究发现,全新世木兰溪河口相继发育河流相、滨岸沼泽相、浅海相到潮控河口相,沉积环境演变主要受控于研究区的相对海平面变化.福建中部沿岸的相对海平面高度在9.0 ka左右,约为-20 m;此后海侵不断扩大,至5.8 ka左右海平面达到最大高度,随后缓慢下降至今.岩心高分辨率XRF扫描的元素相对强度数据校正后可指示沉积物的物源及古环境变化.钻孔的K/Ti比值表明,约8.8 ka以来,木兰溪河口沉积物主要为流域剥蚀产物和口外长江源细粒物质的混合;岩心Fe/Ti比值在约3.6 ka、4.3 ka、5.4 ka和6.0 ka 4个东亚冬季风较强时期均达到峰值且与东海内陆架泥质沉积记录一致,指示浙闽沿岸流强度的影响.揭示了我国东南沿海潮控型山溪性河口的河海相互作用特征,以及全新世季风-海平面变化驱动下的长江源细粒沉积物在陆架海复杂的源汇沉积过程,也拓展了XRF岩心扫描方法在海陆相互作用强烈的大陆边缘地区应用潜力.
木兰溪 / 全新世 / XRF岩心扫描 / 沉积环境 / 海平面变化 / 东亚冬季风 / 海洋地质.
Mulanxi River / Holocene / XRF core scanning / sedimentary environment / sea level change / East Asian winter monsoon / marine geology
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国家重点研发计划(2022YFF0800504)
国家自然科学基金项目(42230410;41991324)
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