[1]杨义忠,王 徽,蔡 杨,等.北淮阳东段板桥岩体地球化学特征及同位素年代学研究[J].华东地质,2018,39(04):241-251.[doi:10.16788/j.hddz.32-1865/P.2018.04.001]
 YANG Yi-zhong,WANG Hui,CAI Yang,et al.Geochemical characteristics and isotope chronology study of the Banqiao granodiorite in the eastern part of North Huaiyang[J].East China Geology,2018,39(04):241-251.[doi:10.16788/j.hddz.32-1865/P.2018.04.001]
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北淮阳东段板桥岩体地球化学特征及同位素年代学研究()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
39
期数:
2018年04期
页码:
241-251
栏目:
基础地质
出版日期:
2018-12-01

文章信息/Info

Title:
Geochemical characteristics and isotope chronology study of the Banqiao granodiorite in the eastern part of North Huaiyang
文章编号:
2096-1871(2018)04-241-11
作者:
杨义忠王 徽蔡 杨柳丙全
(安徽省地质调查院,合肥 230001)
Author(s):
YANG Yi-zhongWANG HuiCAI YangLIU Bing-quan
(Geological Survey of Anhui Province,Hefei 230001,China)
关键词:
地球化学 锆石U-Pb年龄 板桥岩体 北淮阳 安徽
Keywords:
geochemistry zircon U-Pb dating Banqiao granodiorite North Huaiyang Anhui Province
分类号:
P588.12; P597
DOI:
10.16788/j.hddz.32-1865/P.2018.04.001
文献标志码:
A
摘要:
位于北淮阳东段的板桥岩体为凌家冲杂岩体的重要组成部分,岩石类型为花岗闪长岩。该岩体偏铝质、富碱、高钾、贫钙,属于高钾钙碱性系列岩石; 稀土元素含量中等,(La/Yb)N与HREE/LREE值较高,重稀土元素相对亏损,铕弱负异常,属轻稀土元素富集型; 大离子亲石元素Rb、Ba、K、La、Nd富集,高场强元素Nb、Ta、Ti、P亏损。通过LA-ICP-MS锆石U-Pb定年,获得板桥岩体206Pb/238U年龄为129.0±1.9 Ma,表明该岩体形成于燕山晚期,是早白垩世岩浆活动的产物。板桥花岗闪长岩形成于后碰撞的伸展构造环境。
Abstract:
The Banqiao granodiorite in the eastern part of North Huaiyang, which consists mainly of granodiorite, is an important component of the Lingjiachong complex. The Banqiao granodiorite is characterized by meta-aluminum, rich alkali, high K and low Ca,suggesting that it belongs to the high K calc-alkalic series. Medium REE content, high(La/Yb)N and HREE/LREE ratios, distinct HREE depletion relative to LREE, and weak negative Eu anomalies indicate that the Banqiao granodiorite belongs to a LREE-enriched plutonic rock. Large-ion lithophile elements(LILE), such as Rb, Ba, K, La and Nd, are significantly enriched, while high field strength elements(HFSE), such as Nb, Ta, Ti and P, are depleted. LA-ICP-MS zircon U-Pb dating yields a 206Pb/238U age(129.0±1.9 Ma)for the Banqiao granodiorite, indicating that it formed in the Late Yanshanian and likely was the product of the Early Cretaceous magmatic activity. Based on the regional geological background of the study area and geochemical tectonic environment discrimination in this study,it can be concluded that the Banqiao granodiorite formed in the post-collision extensional tectonic setting.

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备注/Memo

备注/Memo:
*收稿日期:2017-12-07 修订日期:2018-03-12
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(编号:1212011220547)”项目资助。
第一作者简介:杨义忠,1965年生,男,高级工程师,主要从事岩石学和地球化学研究。
更新日期/Last Update: 2018-11-13