摘要
山东肥城-岱岳地区新太古代侵入岩主要出露峄山序列和傲徕山序列,是鲁西乃至华北克拉通具有代表性的新太古代岩体。对傲徕山序列的细粒二长花岗岩进行了LA-ICP-MS锆石U-Pb测年,其结果为(2512±21)Ma,表明该序列的侵位时代为新太古代末期。对肥城—岱岳地区新太古代侵入岩岩石学、岩石地球化学、年代学特征及形成环境进行了分析,结果表明:峄山序列多数属于钙碱性、准铝质系列,相对富钠;傲徕山序列为高钾钙碱性、过铝质系列;峄山序列全部样品具有轻稀土富集、重稀土亏损的右倾型稀土配分模式,轻、重稀土分馏程度明显,Eu异常及Ce异常均不明显;傲徕山序列大部分样品具有轻稀土富集、重稀土亏损的右倾型稀土配分模式,轻、重稀土分馏程度不均匀,大部分样品具有Eu负异常,Ce异常不明显;两个序列均表现出显著的K、U、Pb、Gd等元素正异常和Nb、Ta、Ti、P等元素负异常,具有富集大离子亲石元素(LILE)、亏损高场强元素(HFSE)的特点;峄山序列岩浆主要来源于岩浆源区,是岩石圈地幔;傲徕山序列岩浆来源于地壳,但混染少量地幔物质;峄山序列产出于挤压向伸展过渡的构造环境中,傲徕山序列产出于伸展背景下的活动大陆边缘环境中。
The Neoarchean intrusive rocks in Feicheng-Daiyue area in Shandong province mostly exhibit Yishan series and Aolaishan series and represent Neoarchean intrusive rocks of western Shandong and even North China craton.In this study,LA-ICP-MS U-Pb dating of zircon was conducted with fine-grained monzogranite in Aolaishan series,resulting in(2,512±21)Ma,it indicated that the emplacement of this series took place at the end of Neoarchean.The results from study on petrological,geochemical,chronological characteristics and formation environment of Neoarchean intrusive rocks in Feicheng-Daiyue area in Shandong province show that most of the Yishan series belongs to calcium alkaline and quasi aluminous series,which was relatively rich in sodium.Aolaishan series contained high potassium and calcium and excessive aluminum.All samples from Yishan series exhibited a right devi-ation REE distribution pattern rich in light rare earth and deficient in heavy rare earth.The fractionation level of light and heavy rare earth was conspicuous and both the Eu anomaly and Ce anomaly were not obvious.Most samples from Aolaishan series also presented a right deviation REE distribution pattern rich in light REE and deficient in heavy REE.But the fractionation level of light and heavy REE was uneven.Most samples presented Eu negative anomalies and unconspicuous Ce abnormal.Both series presented significant positive anomalies of elements such as K,U,Pb and Gd and negative anomalies of elements like Nb,Ta,Ti and P.Which were characterized by enrichment of large ion lithophile elements(LILE)and loss of high field strength elements(HFSE).The rock magma of Yishan series mainly derived from the lithospheric mantle.The origin of rock magma of Aolaishan series was the earth's crust,mixed with a small amount of mantle material.The Yishan series occurred in the tectonic environment for the transition from compression to extension,and Aolaishan series occurred under the active continental margin environment with the extension.
作者
张振飞
杨海林
高继雷
周永刚
裴伦培
徐国良
王辉
Zhang Zhenfei;Yang Hailin;Gao Jilei;Zhou Yonggang;Pei Lunpei;Xu Guoliang;Wang Hui(School of Land and Resources,Kunming University of Science and Technology,Kunming Yunnan 650000,China;Shandong No.1 Institute of Geological and Mineral Exploration,Jinan Shandong 250100,China;Shandong High-grade Iron Ore Deposit Exploration Technology Development Engineering Laboratory,Jinan Shandong 250100,China)
出处
《化工矿物与加工》
CAS
2023年第1期20-28,共9页
Industrial Minerals & Processing
基金
山东省地勘基金项目(鲁勘字〔2016〕39号)。
