干旱区生态环境知识资源中心(Arid): 山东灵山岛莱阳群粉砂岩地球化学特征及意义

Arid

	山东灵山岛莱阳群粉砂岩地球化学特征及意义
其他题名	Geochemical Characteristics and Signatures of Siltstones from Laiyang Group at Lingshan Island 9 Qingdao,Shandong
	张振凯 1; 周瑶琪 1; 彭甜明 1; 于珊珊 1; 岳会雯 1; 周腾飞 1; 刘加召 2
来源期刊	地球科学
ISSN	1000-2383
出版年	2017
卷号	42 期号:3 页码:357-377
中文摘要	灵山岛下部莱阳群重力流沉积地层以其巨厚的沉积规模,独特的沉积特征受到国内外地质学界越来越多的重视.但目前,该套地层的源区风化程度、物源性质、物源区构造背景及沉积环境尚不明确,通过对灵山岛下部莱阳群粉砂岩进行岩相学分析、主量元素XRF测试、稀土及微量元素ICP-MS测试,结果显示:粉砂岩SiO_2含量较低(平均51.78%),Fe_2O_3~T含量较高(平均5.73%),Na_2O平均含量为2.74%,K_2O平均含量为2.79%;通过主量元素投图分析,样品归类为杂砂岩及岩屑砂岩;样品SigmaREE为153.0010~(-6)~254.3810~(-6),平均为201.65*10~(-6),高于PAAS及UCC,富集轻稀土元素,贫重稀土元素,具有中等程度Eu负异常,弱Ce负异常;相对于UCC,样品富集大离子亲石元素,弱富集高场强元素,亏损过渡组元素.样品ICV值高(>0.84)、为初次循环沉积,CIA值低(<65)表明源区风化强度低,物源为长英质物质及少量古地壳再旋回物质,物源区大地构造背景为大陆岛弧与活动大陆边缘,沉积环境为海相还原环境且莱阳期为干热气候.此外,应用对REE元素进行归类统计的方法来推测物源区,分析表明样品物源区最有可能为胶南群与蓬莱群地层.
英文摘要	Gravity flow deposits of Laiyang Group at the lower part of Lingshan island attract an increasing attention of geologists at home and abroad because of its huge thickness and unique sedimentary features. However, its weathering degree, characteristics and structural setting of provenance, and depositional environment stillremain in dispute. In this study, major elements ,rare earth elements and trace elements contents of the siltstones from Laiyang Group at Lingshan Island were examined by XRF and ICP-MS. It is found that siltstones are characterized by relatively low contents of SiO_2 (avg. 51.78%) and high contents of Fe_2O_3~T(avg. 51.78%) ; average contents of Na_2O and K_2O of siltstones are 2.74% and 2.79%, respectively, the siltstones are classified as litharenites and greywackes; REE contents of the samples are 153.00 * 10~(-6)-254.38* 10~(-6) (avg. 201.65* 10~(-6)),which are higher than those of UCC and PAAS; the pattern of REE is characterized by LREE enrichment, HREE depletion, moderately negative Eu abnormity and weakly negative Ce abnormity; compared with UCC, samples are enriched in LILEs, weakly enriched in HFSEs and depleted in transitional elements. Index of Compositional Variability (ICV) values of siltstones in Lingshan Island are high,which indicates the source materials are mainly primary cycle sediments, Chemical Index of Alteration (CIA) values are relatively low, which suggests that the weathering intensity of provenance is low. Element analysis indicates that felsic rocks serve as the main source rocks, including small amounts of contributions from recycled orogenic belt materials; tectonic settings of provenance belong to active continental margin and continental island arc; sedimentary environment is reducing marine environment and paleoclimate of Laiyang Period was arid. It is original for the authors to apply the statistical analysis method to determine the provenance regions more precisely according to the features of REEs, and it is concluded that the source rocks are most likely from Jiaonan Group and Penglai Group.
中文关键词	灵山岛 ; 莱阳群 ; 地球化学 ; 沉积环境
英文关键词	Lingshan island Laiyang Group geochemistry sedimentary environment
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:5948516
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235784
作者单位	1.(青岛)中国石油大学地球科学与技术学院, 青岛, 山东 266580, 中国; 2.山东省第八地质矿产勘查院, 日照, 山东 276826, 中国
推荐引用方式 GB/T 7714	张振凯,周瑶琪,彭甜明,等. 山东灵山岛莱阳群粉砂岩地球化学特征及意义[J],2017,42(3):357-377.
APA	张振凯.,周瑶琪.,彭甜明.,于珊珊.,岳会雯.,...&刘加召.(2017).山东灵山岛莱阳群粉砂岩地球化学特征及意义.地球科学,42(3),357-377.
MLA	张振凯,et al."山东灵山岛莱阳群粉砂岩地球化学特征及意义".地球科学 42.3(2017):357-377.