IGGCAS OpenIR  > 地球与行星物理院重点实验室
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
2019
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume35Issue:7Pages:2206-2218
AbstractFerrimagnetic 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.
KeywordRock magnetism Banded Iron Formation Biogenic/abiogenic magnetite Hematite Verwey transition Morin transition
DOI10.18654/1000-0569/2019.07.16
WOS KeywordWIDESPREAD OCCURRENCE ; HYSTERESIS PROPERTIES ; BIOGENIC MAGNETITE ; LAKE CHIEMSEE ; PARTICLE-SIZE ; GRAIN-SIZE ; IDENTIFICATION ; COERCIVITY ; SEDIMENTS ; GEOCHEMISTRY
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000491151100016
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/93910
Collection地球与行星物理院重点实验室
Corresponding AuthorPan YongXin
Affiliation1.Chinese Acad Sci, CAS Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
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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