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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第43卷

期数:

2021年第05期

页码:

785-799

栏目:

基础地质与矿产地质

出版日期:

2021-09-15

文章信息/Info

Title:

Discovery and Geological Significance of Siliceous Rocks in Beizhan Iron Deposit, the Western Tianshan of Xinjiang, China

文章编号:

1672-6561(2021)05-0785-15

作者:

潘鸿迪¹; 申 萍²; 3; 李昌昊²; 3; 冯浩轩²; 3; 武 阳²; 3; 郭新成⁴; 张建收⁴

(1. 长安大学 地球科学与资源学院,陕西 西安 710054; 2. 中国科学院地质与地球物理研究所中国科学院矿产资源研究重点实验室,北京 100029; 3. 中国科学院大学 地球与行星科学学院,北京 100049; 4. 新疆维吾尔自治区地质矿产勘查开发局第十一地质大队,新疆 昌吉 831100)

Author(s):

PAN Hong-di¹;  SHEN Ping²; 3;  LI Chang-hao²; 3;  FENG Hao-xuan²; 3;  WU Yang²; 3;  GUO Xin-cheng⁴;  ZHANG Jian-shou⁴

(1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 4. The Eleven Geological Branch, Xinjiang Bureau of Geo-exploration and Mineral Development, Changji 831100, Xinjiang, China)

关键词:

硅质岩;  岩相学;  岩石地球化学;  火山沉积成因;  硅质来源;  构造背景;  沉积环境;  新疆

Keywords:

siliceous rock;  petrography;  lithogeochemistry;  volcanic-sedimentary genesis;  siliceous source;  tectonic setting;  sedimentary environment;  Xinjiang

分类号:

P581

DOI:

10.19814/j.jese.2021.06029

文献标志码:

A

摘要:

新疆西天山备战铁矿床出露下石炭统大哈拉军山组第三亚组火山岩和沉积岩,剖面测量和岩相学研究发现其中还发育硅质岩,呈层状、似层状分布于灰岩、英安岩和凝灰岩中。硅质岩主要由玉髓和微粒石英组成,岩石具微晶结构、块状构造和层理构造。硅质岩SiO₂含量(质量分数,下同)(67.26%～83.52%)、Al₂O₃含量(5.85%～15.88%)和TiO₂含量(0.30%～0.68%)较高,且Al₂O₃/(Al₂O₃+Fe₂O₃)值较高(0.89～0.99),而K₂O含量(0.27%～4.09%)和P₂O₅含量(0.06%～0.12%)较低,且MnO/TiO₂值较低(0.02～0.13),稀土元素总含量较高((11.32～119.14)×10^-6),球粒陨石标准化稀土元素配分模式为右倾型。岩相学和岩石地球化学特征表明,备战铁矿区硅质岩为火山沉积成因,硅质主要来源于海底火山喷发,有少量陆源碎屑物质加入,硅质岩形成于大陆边缘环境,其沉积环境为浅海、弱碱性、氧化环境,有利于磁铁矿的形成。综上所述,备战铁矿区硅质岩的发现对确定备战铁矿床的成矿构造背景、形成环境及成因具有重要的指示意义。

Abstract:

The volcanic and sedimentary rocks of the third sub-group of Lower Carboniferous Dahalajunshan Formation outcrop in Beizhan iron deposit, the western Tianshan of Xinjiang. The stratiform and bedded siliceous rocks were recognized based on the geological section survey and petrographic study, and developed in the limestones, dacites and tuffs in Beizhan iron deposit. Siliceous rocks with microcrystalline textures and massive and bedded structures are mainly consist of chalcedony and microcrystalline quartz. Siliceous rocks are characterized by high SiO₂(67.26%-83.52%), Al₂O₃(5.85%-15.88%), and TiO₂(0.30%-0.68%)contents and Al₂O₃/(Al₂O₃+Fe₂O₃)ratios(0.89-0.99), but low K₂O(0.27%-4.09%)and P₂O₅(0.06%-0.12%)contents and MnO/TiO₂ ratios(0.02-0.13). The total contents of REE of siliceous rocks are high((11.32-119.14)×10^-6), and the chondrite-normalized REE patterns are characterized by enriched in LREE and depleted in HREE. The petrography and lithogeochemical characteristics show that siliceous rocks in Beizhan iron mining area are volcanic-sedimentary genesis, and they derive from submarine volcanic eruption with minor terrestrial clastic materials input; siliceous rocks form in a continental margin setting with shallow marine, weakly alkaline and oxidized conditions, which are favourable for the formation of magnetite. Therefore, the discovery of siliceous rocks is important for recognizing the tectonic setting, formation condition, and genesis of Bizhan iron deposit.

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收稿日期:2021-06-29; 修回日期:2021-07-24投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家重点研发计划项目(2018YFC0604004); 中国科学院国际伙伴计划项目(132A11KYSB20190070)
作者简介:潘鸿迪(1943-),男,上海市人,副教授,E-mail:hongzhushi@sina.com。

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更新日期/Last Update: 2021-09-30