[1]鹿献章,周博文,彭 智,等.北淮阳东段河棚岩体地球化学特征、LA-ICP-MS锆石U-Pb年龄及地质意义*[J].华东地质,2017,38(02):81-90.[doi:10.16788/j.hddz.32-1865/P.2017.02.001]
 LU Xian-zhang,ZHOU Bo-wen,PENG Zhi,et al.Geochemical characteristics and LA-ICP-MS zircon U-Pb geochronology of the Hepeng intrusion in the eastern section of North Huaiyang and their geological significance[J].East China Geology,2017,38(02):81-90.[doi:10.16788/j.hddz.32-1865/P.2017.02.001]
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北淮阳东段河棚岩体地球化学特征、LA-ICP-MS锆石U-Pb年龄及地质意义*()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
38
期数:
2017年02期
页码:
81-90
栏目:
基础地质
出版日期:
2017-06-15

文章信息/Info

Title:
Geochemical characteristics and LA-ICP-MS zircon U-Pb geochronology of the Hepeng intrusion in the eastern section of North Huaiyang and their geological significance
文章编号:
2096-1871(2017)02-081-10
作者:
鹿献章1周博文23彭 智1邱军强14陈 芳14董婷婷14柳丙全1陈志洪3
(1. 安徽省地质调查院,合肥230001; 2. 中国地质科学院,北京100037;3. 中国地质调查局南京地质调查中心,南京210016; 4. 安徽省大陆成矿研究中心,合肥230001)
Author(s):
LU Xian-zhang1ZHOU Bo-wen23PENG Zhi1QIU Jun-qiang14CHEN Fang14DONG Ting-ting14LIU Bing-quan1CHEN Zhi-hong3
(1. Geological Survey of Anhui Province,Hefei 230001,China;2. Chinese Academy of Geological Sciences, Beijing 100037, China;3. Nanjing Centre, China Geological Survey, Nanjing 210016, China;4. Continental Mineralization Research Center of Anhui Province,Hefei 230001,China)
关键词:
岩石地球化学 锆石U-Pb定年 构造环境 河棚岩体 北淮阳
Keywords:
geochemistry zircon U-Pb dating tectonic environment Hepeng intrusion North Huaiyang
分类号:
P597+.3; P588.12
DOI:
10.16788/j.hddz.32-1865/P.2017.02.001
文献标志码:
A
摘要:
河棚岩体位于北淮阳东段河棚地区,为似斑状细粒黑云钾长花岗岩,具较高的SiO2和碱质含量,属于偏铝质碱性系列岩石。稀土元素含量中等,LaN/YbN与LREE/HREE值均较大,HREE相对于LREE明显亏损,Eu弱负异常,具较弱的Ce负异常,轻稀土分馏较明显,重稀土较平坦,属轻稀土富集型。岩石富集大离子亲石元素Rb、Ba、K和高场强元素Th、U、Ce、Zr、Hf,亏损Nb、Ta、Sr、Ti、P。通过LA-ICP-MS锆石U-Pb定年,获得河棚岩体206Pb/238U年龄为128.6±2.1 Ma,表明该岩体形成于燕山晚期,是早白垩世早期岩浆活动的产物,代表河棚岩体的成岩年龄。主、微量元素地球化学特征表明河棚岩体属于非造山A型花岗岩,形成于燕山晚期伸展构造环境。
Abstract:
The Hepeng intrusion, located in the Hepeng area in the eastern section of North Huaiyang, consists mainly of porphyritic fine-grained biotite-feldspar granite. It has high SiO2 and alkali contents, belonging to the metaluminous alkaline rock series. The Hepeng intrusion is characterized by medium REE content, high LaN/YbN and LREE/HREE ratios, distinct HREE depletion relative to LREE, weak negative Eu anomalies and weaker negative Ce anomalies, and distinct fractionation of LREE relative to that of HREE, indicating it belongs to a LREE-enriched terrane. Large-ion lithophile elements(LILE), such as Rb, Ba and K, and high field strength element(HFSE), such as Th, U, Ce, Zr and Hf, are significantly enriched, while Nb, Ta, Sr, Ti and P are depleted. LA-ICP-MS zircon U-Pb dating yields a 206Pb/238U age(128.6+2.1 Ma)for the Hepeng intrusion, indicating the diagenetic age of the Hepeng intrusion is in late Yanshanian and the Hepeng intrusion was the product of the Early Cretaceous magmatic activity. Geochemical characteristics of major and trace elements show that the Hepeng intrusion belongs to the anorogenic A-type granites and formed in extensional tectonic environment at late Yanshanian period.

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备注/Memo

备注/Memo:
*收稿日期:20160701修订日期:20160922责任编辑:谭桂丽
基金项目:中国地质调查局“安徽北淮阳地区成矿规律与资源潜力调查(项目编号:1212011220547)”和“长江中下游关键地区区域地质调查(项目编号:12120113069100)”联合资助。
第一作者简介:鹿献章,1962年生,男,高级工程师,主要从事资源环境地质调查研究。
通讯作者简介:周博文,1992年生,男,研究生,主要从事区域大地构造学研究。
更新日期/Last Update: 2017-06-16