[1]李五福,潘 彤,王秉璋.2021.青海南山奥陶纪岩浆弧:来自茶卡北山闪长岩锆石U-Pb年代学、元素地球化学和Hf同位素的证据.大地构造与成矿学,优先出版:001-21.doi:10.16539/j.ddgzyckx.2021.05.014
 LI Wufu,PAN Tong,WANG Bingzhang.2021.Ordovician magmatic arc in the Nanshan area, Qinghai Province:Evidence from zircon U-Pb chronology, element geochemistry and Hf isotope compositions of the diorites in the Chakaibeishan Area.Geotectonica et Metallogenia,优先出版:001-21.doi:10.16539/j.ddgzyckx.2021.05.014
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青海南山奥陶纪岩浆弧:来自茶卡北山闪长岩锆石U-Pb年代学、元素地球化学和Hf同位素的证据
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2021年优先出版
页码:
001-21
栏目:
出版日期:
2021-12-31

文章信息/Info

Title:
Ordovician magmatic arc in the Nanshan area, Qinghai Province:Evidence from zircon U-Pb chronology, element geochemistry and Hf isotope compositions of the diorites in the Chakaibeishan Area
作者:
李五福1 2 潘 彤3 王秉璋1 2 张新远1 2 郑 英1 2 王春涛1 2 李善平1 2 韩 杰1 2
1.青海省地质调查院, 青海 西宁810012; 2.青海省青藏高原北部地质过程与矿产资源重点实验室, 青海 西宁810012; 3.青海省地质矿产勘查开发局, 青海 西宁 810001
Author(s):
LI Wufu1 2 PAN Tong3 WANG Bingzhang1 2 ZHANG Xinyuan1 2 ZHEN Ying1 2 WANG Chuntao1 2 LI Shanping1 2 and HAN Jie1 2
1. Qinghai Institute of Geological Survey, Xining 810012, Qinghai, China; 2. Key Laboratory of Geological Process and Mineral Resources for Northern Qinghai-Tibet Plateau, Xining 810012, Qinghai, China; 3. Bureau of Geology and Mineral Exploration and Development of Qinghai Province, Xining 810001, Qinghai, China
关键词:
青海南山 茶卡北山闪长岩 锆石U-Pb定年 地球化学 构造环境
Keywords:
Qinghai Nanshan Chaqiabeishan diorite zircon U-Pb dating geochemistry tectonic environment
分类号:
P67
DOI:
10.16539/j.ddgzyckx.2021.05.014
文献标志码:
A
摘要:
青海南山构造带发育北西–南东向展布的早古生代侵入岩, 其研究对了解青海南山构造带早古生代阶段地质属性与地质过程具有重要意义。本文对茶卡北山恰让地区闪长岩进行了详细的岩石学、岩石地球化学和LA-ICP-MS锆石U-Pb同位素年代学研究。结果表明, 恰让闪长岩形成于晚奥陶世(446~447 Ma)。岩石具有低和变化的硅(SiO2=49.68%~62.52%)、富钠(Na2O=2.48%~3.13%、K2O/Na2O=0.37~1.30, 平均0.79)、高镁(MgO=4.45%~6.84%、Mg#值为62~68)和高Cr(158.36~384)Ni(74.68~136.05)特征。岩石的稀土总量较低, 轻稀土富集, 重稀土略微亏损, 轻微Eu负异常(δEu=0.76~0.82)。微量元素显示富集大离子亲石元素(LILE)K、Cs、Sr、Rb, 相对亏损高场强元素(HFSE)Nb、Ta、P、Ti等元素。Hf同位素显示, εHf(t)值分布范围在(-7.8~-2.6)。结合区域地质背景资料, 我们认为恰让闪长岩岩体形成于弧的背景中, 可能为南祁连洋向北俯冲的地球动力学背景下俯冲沉积物熔体与地幔楔橄榄岩反应的产物。
Abstract:
Early Paleozoic intrusive rocks occur in the NW-SE direction in Qinghai Nanshan tectonic belt. The study on the early Paleozoic intrusive rocks is of great significance for understanding the geological properties and geological processes in the Nanshan tectonic belt, Qinghai. This paper, presents petrological, petrogeochemical and LA-ICP-MS zircon U-Pb chronological and Hf isotope data of the Charan diorites. The results show that the Charan diorites were generated in the late Ordovician (446 to 447 Ma). These diorites are characterized by low and variable silicon (SiO2: 51.56% to 62.94%) and high sodium (Na2O: 2.84% to 3.18%, K2O/Na2O: 0.37 to 1.30, with an average of 0.77) and magnesium (MgO: 4.72% to 7.10%, Mg#: 61.68 to 64.08) and high Cr (158.36 to 384), Ni(74.68 to 136.05). They have relatively low total amount of rare earth elements, the enrichemnt of light rare earth elements and depletion of heavy rare earth elements with weak Eu negative anomalies (Eu: 0.76 to 0.82). They also show the enrichment of large-ion lithophile elements (LILE) (K, Cs, Sr and Rb), and relatively depletion of high- field strength elements (HFSE) Nb, Ta, P, Ti and other elements. They have negative and slightly variable εHf(t) values (-7.8 to -2.6). Combined with the regional geological background data, we suggest that the diorites were formed in an arc setting, and were generated by the intertaction between subducted oceanic sediment-derived melts and mantle wedge peridotites during the northward subduction of the Southern Qilian Ocean.

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备注/Memo

备注/Memo:
收稿日期: 2021-02-04; 改回日期: 2021-03-01
项目资助: 第二次青藏高原综合科学考察研究(STEP)项目(No. 2019QZKK0702)、青海省地质调查局地质调查项目(2020021022jc013)、中国地质调查局地质调查项目(1212011221151)
第一作者简介: 李五福(1982-), 男, 硕士, 高级工程师, 从事区域地质调查研究。Email: 15422504@qq.com
通信作者: 潘彤(1966-), 男, 博士, 教授级高工, 从事技术及管理工作。Email: pant66@ 163. com
更新日期/Last Update: 2021-11-03