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Rock magnetism of the banded iron formation in Barberton greenstone belt, South Africa

文献类型:期刊论文

作者Zhang Min1,2,3; Han XiaoHua1,2,3; Pan YongXin1,2,3
刊名ACTA PETROLOGICA SINICA
出版日期2019
卷号35期号:7页码:2206-2218
ISSN号1000-0569
关键词Rock magnetism Banded Iron Formation Biogenic/abiogenic magnetite Hematite Verwey transition Morin transition
DOI10.18654/1000-0569/2019.07.16
英文摘要Ferrimagnetic minerals and their origins in banded iron formations (BIFs) are contentious research topics. Here we present an integrated rock magnetic result of BIFs sample from Barberton greenstone belt (South Africa). Hysteresis loops, acquisition of saturation isothermal remanent magnetism and its back-field demagnetization curves, coercivity spectrum analysis, first-order-reversal curves (FORC), low-temperature (20 similar to 300K) magnetic measurements (zero-field cooling/field cooling curves), thermal demagnetization of three-component isothermal remanent magnetization curves and scanning electron microscopy observation were performed. We found that hematite and magnetite are dominated in the studied sample. The magnetite grains in the iron-rich layers are mainly multi-domain and pseudo-single-domain states with average relative content 2. 1% and the average relative content of hematite is 97. 9%. In the silica-rich layer, magnetite grains mainly consist of pseudo-single-domain and superparamagnetic states with an average relative content of 4. 6% and the mean of relative content of hematite is 95. 4%. Morin transition ranging in temperature from 250K to 260K reveal that hematite grains in BIFs is dominated by multi-domain (0. 5 similar to 6mm). Interestingly, the silica-rich layer displays the Verwey transition at similar to 107K and similar to 125K, implying presence of biogenic and abiogenic magnetite in the sample.
WOS关键词WIDESPREAD OCCURRENCE ; HYSTERESIS PROPERTIES ; BIOGENIC MAGNETITE ; LAKE CHIEMSEE ; PARTICLE-SIZE ; GRAIN-SIZE ; IDENTIFICATION ; COERCIVITY ; SEDIMENTS ; GEOCHEMISTRY
WOS研究方向Geology
语种英语
出版者SCIENCE PRESS
WOS记录号WOS:000491151100016
源URL[http://ir.iggcas.ac.cn/handle/132A11/93910]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Pan YongXin
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Chinese Acad Sci, CAS Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing 100029, Peoples R China
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Zhang Min,Han XiaoHua,Pan YongXin. Rock magnetism of the banded iron formation in Barberton greenstone belt, South Africa[J]. ACTA PETROLOGICA SINICA,2019,35(7):2206-2218.
APA Zhang Min,Han XiaoHua,&Pan YongXin.(2019).Rock magnetism of the banded iron formation in Barberton greenstone belt, South Africa.ACTA PETROLOGICA SINICA,35(7),2206-2218.
MLA Zhang Min,et al."Rock magnetism of the banded iron formation in Barberton greenstone belt, South Africa".ACTA PETROLOGICA SINICA 35.7(2019):2206-2218.

入库方式: OAI收割

来源:地质与地球物理研究所

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