辽河三角洲地区ZK2孔晚更新世晚期以来的碎屑矿物及其物源

发布时间：2018-02-27 02:06

本文关键词： 碎屑矿物物源辽河辽河三角洲　出处：《海洋地质与第四纪地质》2016年06期 　论文类型：期刊论文

【摘要】：对辽河三角洲地区ZK2孔(孔深0~32m)的92个沉积物样品中碎屑矿物进行鉴定和统计分析,结果显示:所有样品中轻矿物质量百分含量均超过95%,以石英和长石为主;重矿物质量百分平均含量仅为0.82%,以普通角闪石、绿帘石、阳起石、石榴子石、赤-褐铁矿和自生黄铁矿等为主。轻矿物组合和含量在地层中变化相对稳定,而重矿物组合和含量则在地层中变化显著。以所有重矿物各自百分含量为变量,利用Tilia软件进行有序聚类,自下而上可以划分出4个不同的重矿物组合带,这些组合带分别大致对应河道、湖沼、潮坪-浅海、三角洲4个沉积相环境。研究表明:不同组合带中各重矿物百分含量的变化与沉积环境紧密相关,其中沉积环境中水动力条件和离河口的远近,是控制重矿物中稳定矿物特别是金属矿物变化的主导因素。ZK2孔自晚更新世晚期以来沉积物源没有发生明显的变化,其主要物源来自辽河,其次为大辽河。
[Abstract]:The clastic minerals in 92 sediment samples from ZK2 pore (pore depth 0 ~ 32m) in Liaohe Delta area were identified and statistically analyzed. The results showed that the content of light minerals in all samples was over 95%, mainly quartz and feldspar. The average mass percent content of heavy minerals is only 0.82%, mainly composed of ordinary hornblende, verdant, actinolite, pomegranate, red-limonite and authigenic pyrite, etc. The light mineral assemblages and contents are relatively stable in the strata. The assemblages and contents of heavy minerals vary significantly in the strata. With the percentage content of all heavy minerals as variables, and using Tilia software for orderly clustering, four different heavy mineral assemblages can be divided from bottom to top. These assemblages correspond to four sedimentary facies environments respectively: Channel, lake and marsh, tidal flat to shallow sea and delta. The results show that the variation of the percentage of heavy minerals in different assemblage zones is closely related to the sedimentary environment. The hydrodynamic conditions and the distance from estuaries in the sedimentary environment are the dominant factors controlling the change of stable minerals, especially metal minerals in heavy minerals. The source of sediments in hole ZK2 has not changed significantly since the late Pleistocene. Its main source of material comes from the Liaohe River, followed by the Great Liaohe River.
【作者单位】：中国地质调查局滨海湿地生物地质重点实验室;青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室;国土资源部海洋油气资源与环境地质重点实验室;国土资源部海洋地质实验检测中心;中国地质调查局青岛海洋地质研究所;同济大学海洋与地球科学学院;
【基金】：国家海洋地质保障工程(DD20160144,GZH201200503,1212010611402) 国家自然科学青年基金项目(41506062) 国土资源部海洋油气资源与环境地质重点实验室基金(MRE201410)
【分类号】：P534.631;P343.5

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