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厄立特里亚中部Adi Keyh A型流纹岩成因及地质意义

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曾国平, 王建雄, 向文帅, 童喜润, 邵鑫, 胡鹏, 吴发富, 姜军胜, 向鹏. 2022. 厄立特里亚中部Adi Keyh A型流纹岩成因及地质意义. 华南地质, 38(1): 157-173. doi: 10.3969/j.issn.2097-0013.2022.01.012
引用本文: 曾国平, 王建雄, 向文帅, 童喜润, 邵鑫, 胡鹏, 吴发富, 姜军胜, 向鹏. 2022. 厄立特里亚中部Adi Keyh A型流纹岩成因及地质意义. 华南地质, 38(1): 157-173. doi: 10.3969/j.issn.2097-0013.2022.01.012
shu
ZENG Guo-Ping, WANG Jian-Xiong, XIANG Wen-Shuai, TONG Xi-Run, SHAO Xin, Hu Peng, WU Fa-Fu, JIANG Jun-Sheng, XIANG Peng. 2022. Petrogenesis and Geological Significance of the Adi Keyh A-type Rhyolite in Central Eritrea. South China Geology, 38(1): 157-173. doi: 10.3969/j.issn.2097-0013.2022.01.012
Citation: ZENG Guo-Ping, WANG Jian-Xiong, XIANG Wen-Shuai, TONG Xi-Run, SHAO Xin, Hu Peng, WU Fa-Fu, JIANG Jun-Sheng, XIANG Peng. 2022. Petrogenesis and Geological Significance of the Adi Keyh A-type Rhyolite in Central Eritrea. South China Geology, 38(1): 157-173. doi: 10.3969/j.issn.2097-0013.2022.01.012
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厄立特里亚中部Adi Keyh A型流纹岩成因及地质意义

  • 中国地质调查局武汉地质调查中心（中南地质科技创新中心），武汉 43205

  • 基金项目:

    中国地质调查局地质调查项目（Nos. DD20190443，DD20221802）

详细信息
    作者简介: 曾国平（1990—），男，博士，矿物学、岩石学、矿床学专业，E-mail: 1204929467@qq.com
    通讯作者: 王建雄（1966—），男，教授级高级工程师，地质学专业，E-mail: 245425463@qq.com

  • 中图分类号: P581

Petrogenesis and Geological Significance of the Adi Keyh A-type Rhyolite in Central Eritrea

  • Wuhan Center, China Geological Survey (Central South China Innovation Center for Geosciences), Wuhan 43205, Hubei, China

More Information
    Corresponding author: WANG Jian-Xiong

    摘要
  • 厄立特里亚位于东非裂谷系统（EARS）北部，区内新生代火山活动明显，但对其研究十分有限。Adi Keyh流纹岩产于厄立特里亚中部，锆石LA-ICP-MS U-Pb定年结果显示其形成时代为26.1±0.2Ma，属于渐新世。全岩地球化学分析结果显示，该流纹岩具有高硅（SiO2=72.97%~73.53%）、富碱（ALK=8.94%~9.12%）、富钾（K2O/Na2O=1.15~1.18）的特征，为高钾钙碱性岩石系列；微量元素富集Th、La、Ce、Nd和Zr而强烈亏损Ba、Sr、P和Ti等元素，并且Zr+Nb+Ce+Y含量和10000×Ga/Al比值较高；轻稀土元素相对富集，Eu负异常显著。Hf和Sr同位素组成为：ε Hf (t)=+12.0~+20.4；(87Sr/86Sr) i i=0.70424~0.70477。岩石地球化学及Hf-Sr同位素组成显示Adi Keyh流纹岩为A1型板内流纹岩，可能为新生镁铁质下地壳部分熔融的产物，构造背景为渐新世EARS裂谷期阿法（Afar）地幔柱活动引发的岩石圈伸展。
    Eritrea, located in the northern of the Eastern African Rift System (EARS), is featured with rich Cenozoic volcanic activites that are neglected by geologists. The Adi Keyh rhyolite, developed in central Eritrea, is confirmed to format 26.07±0.18 Ma during Oligocene by Zircon LA-ICP-MS U-Pb isotope dating . After geochemical analysis, the rhyolite samples are regarded as high-K calc-alkaline series characterized by high SiO2 (72.97% - 73.53%), high ALK (8.94% - 9.12%), and rich potassium (K2O/Na2O=1.15 - 1.18). They are enriched in Th, La, Ce, Nd and Zr, but depleted in Ba, Sr, P and Ti, with high Zr+Nb+Ce+Y and 10000×Ga/Al values. They are also rich in LREE with strong negative Eu anomaly. The Hf-Sr isotopiccontent of rhyoliteare high positive ε Hf (t) (+12.0 - +20.4) and low (87Sr/86Sr) i (0.70424~0.70477). Geochemical features and Hf-Sr isotopic composition indicate that the Adi Keyh rhyolite is categorized as A1-type intraplate rhyolite, which may be the product of partial melting of the juvenile mafic lower crust with the tectonic setting of lithosphere extension triggered by the Afar mantle plume during the EARS Rift in Oligocene.
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