| 韩宗珠,陈筱林,许红,周瑶琪,李敏,张贺,徐翠玲.青岛青山湾-垭口变沉积岩岩石地球化学特征及其物质来源[J].地质找矿论丛,2014,29(3):400-407 |
| 青岛青山湾-垭口变沉积岩岩石地球化学特征及其物质来源 |
| Petrogeochemistrical characteristics and provenance of matasedimentary rocks in Qingshan bay-Yakou area, Qingdao |
| 投稿时间：2013-10-23 |
| DOI：10.6053/j.issn.1001-1412.2014.03.014 |
| 中文关键词: 碎屑岩 活动陆缘 物源 长英质岩石 山东省 |
| 英文关键词:clastic rocks active margins provenance felsic rock Shandong province |
| 基金项目:国家自然科学基金项目（编号：41376053）、国家重点基础研究发展计划（编号：2012CB956004）联合资助。 |
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| 中文摘要: |
| 青岛青山湾-垭口出露一套浅变质的海相陆缘碎屑沉积岩，上覆岩浆锆石的LA-ICP-MS U-Pb年龄为（118.9±3.3） Ma，成熟度较低，与中新生代造山带砂岩类似。稀土元素球粒陨石化标准配分曲线均为轻稀土明显富集的右倾型，表明，研究区碎屑岩具有相同的物源区和构造背景，与活动陆缘的稀土元素配分曲线非常接近。Ce具弱的负异常，指示碎屑岩为大陆边缘海相成因，（La/Ce）N（PAAS）表明陆缘碎屑物质对该区碎屑岩有明显的贡献。主微量元素构造环境判别图解表明，研究区碎屑岩具有活动陆缘和大陆岛弧的特征，经历了相对简单的沉积演化过程；结合稀土元素配分曲线的特征，该区碎屑岩更可能是活动大陆边缘沉积形成。主微量元素分析揭示研究区碎屑岩物源富长英质岩石，镁铁质岩石作为物源也参与到成岩过程中。 |
| 英文摘要: |
| There is a shallow metamorphosed sedimentary sequences of terrigenous siliciclastic rocks in Qingshan bay-Yakou area, Qingdao. LA-ICP-MS U-PbLA-ICP-MS U-Pb dating age of zircon of the overlying magma is (118.9±3.3) Ma. The clastic rocks are in low maturity similar to Meso-Cenozoic sandstones from orogenic belt. Curve of the chondrite-nomalized REE patterns of the clastic rocks are characterized by decline to right and enrichment of LREE similar to those of the active continental margin indicating that they share the same tectonic setting. Weak negative Ce anomaly of the patterns implies the terrigenous contribution, as well as marine origin. (La/Ce)N(PAAS)show the major contribution of terrigenous clastic materials to these clastic rocks. The geotectonic discrimination diagrams of major and trace elements characterize the active continental margin and island arc environment and simple sedimentary evolution of the clastic rocks in the study area. Combined with characteristics of the REE patterns the clastic rocks may be deposited at the active continental margin. The analysis of major elements and trace element reveals that the provenance of the clastic rocks is rich in felsic materials and mafic materials incorporated with the rock-forming process. |
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