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Geochemical Characteristics of Wuyang Siliceous Rocks in the Southern Margin of North China Craton and its Constraint on the Formation Environment of BIF of Tieshanmiao Formation
投稿时间:2018-07-11  修订日期:2019-05-22  点此下载全文
引用本文:LI Hongzhong,HE Junguo,LIANG Jin,YANG Fei,ZHAI Mingguo,ZHANG Lianchang,Voudouris PANAGIOTIS.2019.Geochemical Characteristics of Wuyang Siliceous Rocks in the Southern Margin of North China Craton and its Constraint on the Formation Environment of BIF of Tieshanmiao Formation[J].ACTA GEOLOGICA SINICA(English edition),93(6):1738~1754
摘要点击次数: 1268
全文下载次数: 110
DOI:10.1111/1755-6724.14366
作者单位E-mail
LI Hongzhong 1 Guangdong Provincal Key Lab of Geodynamics and Geohazards, Guangdong Provincal Key Laboratory of Geological processes and mineral Resource Survey, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China 2 Key Laboratory of Mineral Resource, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China 3 School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China  
HE Junguo 1 Guangdong Provincal Key Lab of Geodynamics and Geohazards, Guangdong Provincal Key Laboratory of Geological processes and mineral Resource Survey, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China eeshjg@mail.sysu.edu.cn 
LIANG Jin 4 Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 30012, China 5 Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China esljin@163.com 
YANG Fei 3 School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China  
ZHAI Mingguo 2 Key Laboratory of Mineral Resource, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China  
ZHANG Lianchang 2 Key Laboratory of Mineral Resource, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China  
Voudouris PANAGIOTIS 6 Department of Mineralogy-Petrology, National and Kapodistrian University of Athens, Athens 15784, Greece  
 
Author NameAffiliationE-mail
LI Hongzhong 1 Guangdong Provincal Key Lab of Geodynamics and Geohazards, Guangdong Provincal Key Laboratory of Geological processes and mineral Resource Survey, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China 2 Key Laboratory of Mineral Resource, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China 3 School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China  
HE Junguo 1 Guangdong Provincal Key Lab of Geodynamics and Geohazards, Guangdong Provincal Key Laboratory of Geological processes and mineral Resource Survey, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China eeshjg@mail.sysu.edu.cn 
LIANG Jin 4 Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 30012, China 5 Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China esljin@163.com 
YANG Fei 3 School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China  
ZHAI Mingguo 2 Key Laboratory of Mineral Resource, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China  
ZHANG Lianchang 2 Key Laboratory of Mineral Resource, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China  
Voudouris PANAGIOTIS 6 Department of Mineralogy-Petrology, National and Kapodistrian University of Athens, Athens 15784, Greece  
Abstract:Precambrian banded iron formation (BIF) is one of the most important mineral resources in China, mostly abundant in the North China Craton (NCC) with relatively less common in South China. Since the BIF and siliceous rocks both originated from chemical deposition, the syngenetic BIF and Siliceous rocks can help evaluate their environment of formation. We examine here the mineralogy and geochemistry of siliceous rocks associated with the Tieshanmiao Formation BIF, aiming to decipher the conditions of formation of both BIF and Siliceous rocks in the Wuyang area in the NCC. Analysis of the geochemical characteristics of whole rock shows that the SiO2 content of the siliceous rock ranges from 90.11% to 94.85% and is relatively high overall. Trace element contents of Ba and U are also high, the Ba/Sr ratio ranges from 3.89 to 25.28 and the U/Th ratio ranges from 0.09 to 0.20. Finally, the ΣREE value of rare earth elements ranges from 57.03 ppm to 152.59 ppm, and these indexes all indicate that siliceous rock resulted from hydrothermal deposition. Plots of Al2O3-SiO2, SiO2/(K2O+Na2O)-MnO2/TiO2 and Mn-10×(Cu+Co+Ni)-Fe in discrimination diagrams also verify this interpretation. However, both the MgO content, ranging from 0.16 to 0.32, and the Fe/Ti ratio, ranging from 2.50 to 9.72, suggest that terrigenous material was added during the depositional process. Major and trace element parameters of siliceous rock, such as the Al/(A1+Fe+Mn) ratio (from 0.81 to 0.93), MnO/TiO2 (from 0.00 to 0.17), Al/(Al+Fe) (from 0.82 to 0.93), Sc/Th ratio (from 0.21 to 0.50), U/Th (from 0.09 to 0.20), (La/Yb)N (from 0.83 to 3.04), and the (La/Ce)N (from 0.01 to 0.02) all imply that the siliceous rock formed in a continental margin. In addition, the Sr/Ba ratio from 0.08 to 0.26, the δCe value from 0.31 to 0.90, and the δEu value from 0.14 to 0.58, all indicate that the siliceous rock was formed at a relatively deeper water depth and under weak hydrodynamic conditions. Siliceous rock and BIF formed in the same geological setting, with the SiO2/(K2O+Na2O) ratio of siliceous rock ranging from 28.61 to 47.43, the SiO2/Al2O3 ratio from 16.53 to 32.37, and the SiO2/MgO ratio from 287.28 to 592.81, which are all in agreement with chemical deposition associated with volcanic eruptions. The Al2O3/TiO2 ratio from 37.82 to 50.30 indicates that the magma source of siliceous rock was of slightly intermediate composition. During the Late Archean in the Wuyang area, the high concentration and high purity SiO2 quickly precipitated from hydrothermal fluids to finally result in the accumulation of siliceous rock in a marginal sea, while the input corresponding to iron formation components was deposited to form iron formation layers, and limestone was only the product formed during the deposition intervals of siliceous rock and iron formations. In this study, the synsedimentary siliceous rocks of BIF act as a new way to provide direct evidence to understand the formation environment of BIF due to its high geochemical stability.
keywords:siliceous rock, banded iron formation, geochemistry, Tieshanmiao Formation, Wuyang area
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