Rock magnetism of the banded iron formation in Barberton greenstone belt, South Africa | |
Zhang Min1,2,3; Han XiaoHua1,2,3; Pan YongXin1,2,3 | |
刊名 | ACTA PETROLOGICA SINICA |
2019 | |
卷号 | 35期号:7页码:2206-2218 |
关键词 | Rock magnetism Banded Iron Formation Biogenic/abiogenic magnetite Hematite Verwey transition Morin transition |
ISSN号 | 1000-0569 |
DOI | 10.18654/1000-0569/2019.07.16 |
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 |
内容类型 | 期刊论文 |
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 |
推荐引用方式 GB/T 7714 | 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. |
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