福建平潭青峰老红砂物源示踪分析  

Tracer Analysis of Old Red Sand Source in QF Section from Pingtan Island of Fujian Province

作　　者：张红艳[1] 俞鸣同[1] 

机构地区：[1]福建师范大学地理科学学院,福州350007

出　　处：《亚热带资源与环境学报》2014年第1期8-15,共8页Journal of Subtropical Resources and Environment

基　　金：国家自然科学基金项目(41210002);国家基础科学人才培养基金项目(J1210067)

摘　　要：本研究分别在平潭青峰、坛南湾和闽江口琅岐岛采集18个老红砂样品、19个海滩砂样品以及40个河滩砂样品,并对这些样品进行粒度和稀土元素(REE)测量。结果发现老红砂与闽江口琅岐岛河口砂的稀土元素含量特征十分接近;分别对老红砂与闽江河口砂REE数据以及坛南湾海滩砂与闽江口砂(REE)进行了判别函数分析,老红砂的∑REE平均值为84.25μg/g,琅岐岛河口砂的∑REE平均值为89.81μg/g,相似性明显;坛南湾海滩砂的∑REE平均值为16.41μg/g,与闽江河口砂含量差别较大。研究表明:青峰老红砂沉积物主要来源于闽江口河口砂,末次间冰期暖湿气候下闽江输砂量增大,河口外沿岸流增强,大量河砂进入海坛海峡,在强劲的季风搬运下,沉积于平潭岛北部,形成以青峰为代表的平潭岛北部老红砂;而坛南湾海滩砂代表海洋波浪搬运的泥沙,不是老红砂的物源。The 18 old red sand samples , 19 beach sand samples and 40estuary sand samples were col -lected in Qingfeng of Pingtan County , Tannan Bay and Langqi Island of Minjiang estuary , and the grain size and content of rare earth elements （REE） of the samples were measured .Results show that major features of these old red sand samples are rather close to the sand in Minjiang estuary .Further a-nalysis of the REE data using discriminated function shows that the ∑REE average of old red sand is 84.25 ug/g, the ∑REE average of estuary sand is 89.81 ug/g, which have obvious similarity .And the ∑REE average of beach sand is 16.41 ug/g, being very different from the estuary sand .Our study indicates that the old red sand of Qingfeng comes mainly from Minjiang estuary .During last interglacial period, with the increase of coastal current , a great number of river sand was sent into the Haitan Channel and kept depositing to the north of Pingtan Island , causing the formation of old red sand in Pingtan island , especially the Qingfeng old red sand .And the sand of Tannan bay was transported by ocean wave , not causing the formation of so called old red sand .

关 键 词：老红砂 稀土元素分析 物质来源 

分 类 号：P737.1[天文地球—海洋地质]