新元古代阿尔戈马型带状铁矿形成的成因:华北东部克拉通迁安铁矿床铁同位素和元素地球化学的制约因素

IF 3.2 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Precambrian Research Pub Date : 2024-07-04 DOI:10.1016/j.precamres.2024.107480
Xin Han , Junlai Liu
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引用次数: 0

摘要

近几十年来,位于华北克拉通东部河北东部的新元古代迁安BIF矿床引起了人们的广泛关注,但对BIF的成因,如铁的来源、成矿机制以及构造属性等仍存在很大争议。本研究以野外调查、显微观察和地球化学分析为基础,试图揭示乾安矿床成矿物质的来源特征。结果表明,BIF 矿石样品的化学成分主要由 TFe2O3 和 SiO2 组成,少量 Al2O3 和 TiO2。样品的微量元素总含量相对较低。矿石的 PAAS 归一化 REE 分布模式显示 LREE 贫化和 HREE 富集,Eu、Y 和 La 呈强阳性异常。这些特征表明,BIFs 主要是源于古海洋的化学沉淀,有明显的火山热液贡献和少量的碎屑岩输入。它们的铈异常为正值或无异常,δ56铁磁体值为正值,这揭示了铁是在低富氧条件下沉淀的。这些结果与之前的岩石学、构造地质学、变质P-T路径、地球化学、地质年代和数值模拟研究的证据相结合,支持用地幔羽流模型来解释华北克拉通东部河北东部地区复杂的构造热液过程和BIFs的来源。
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Genesis of the Neoarchean Algoma-type banded iron formation: constraints from Fe isotope and element geochemistry of the Qian’an iron deposit, eastern North China craton

The Neoarchean Qian’an BIF deposit in eastern Hebei, eastern North China Craton has attracted extensive attention of study in the last decades, but the genesis, e.g., Fe sources, metallogenic mechanism, as well as tectonic attributes of the BIFs remains highly disputed. Based on field investigations, microscopic observations and geochemical analysis, this study tries to unravel the source characteristics of ore-forming materials in the Qian’an deposit. The results show that the chemical compositions of the BIF ore samples are mainly composed of TFe2O3 and SiO2, with minor Al2O3 and TiO2. The total trace element contents of the samples are relatively low. The PAAS-normalized REE distribution patterns of the ores show LREE depletion and HREE enrichment, with robust positive anomalies of Eu, Y and La. These characteristics indicate that the BIFs are attributed to dominant chemical precipitation originated from paleo-ocean with obvious volcanic hydrothermal contributions and minor clastic input. Their positive to no Ce anomalies and positive δ56Femagnetite values unveil that the iron was precipitated at low oxygen fugacity. These results, in collaboration with evidence from previous lithological, structural geology, metamorphic P-T paths, geochemistry, geochronology and numerical modeling studies, support a mantle plume model to explain the complicated tectono-thermal processes, and the sources of BIFs in Eastern Hebei, eastern North China Craton.

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来源期刊
Precambrian Research
Precambrian Research 地学-地球科学综合
CiteScore
7.20
自引率
28.90%
发文量
325
审稿时长
12 months
期刊介绍: Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.
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