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| 1 | 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显示文摘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 Si O2 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,theΣREE 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 Al2 O3-Si O2,Si O2/(K2 O+Na2 O)-Mn O2/Ti O2 and Mn-10×(Cu+Co+Ni)-Fe in discrimination diagrams also verify this interpretation.However,both the Mg O 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),Mn O/Ti O2(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,theδCe value from 0.31 to 0.90,and theδEu 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 Si O2/(K2 O+Na2 O)ratio of siliceous rock ranging from 28.61 to 47.43,the Si O2/Al2 O3 ratio from 16.53 to 32.37,and the Si O2/Mg O ratio from 287.28 to 592.81,which are all in agreement with chemical deposition associated with volcanic eruptions.The Al2 O3/Ti O2 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 Si O2 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. | LI Hongzhong HE Junguo LIANG Jin YANG Fei ZHAI Mingguo ZHANG Lianchang Voudouris PANAGIOTIS | 2019 | Acta Geologica Sinica(English Edition)2019，93，6： | 2 |
| 2 | Groundwater pollution by heavy metals in historical mining area of Lavrio, Attica, Greece 显示文摘 | Stamatis G Voudouris K Karefilakis F | 2001 | Water Air Soil Pollut2001，128，12： | 1 |
| 3 | Interactive edgewise mechanisms: Form and function comparison with conventional edgewise brackets 显示文摘 | Voudouris JC | 1997 | Am J Orthod Dentofacial Orthop1997，111，2： | 1 |
| 4 | Insecticide resistance status of the codling moth Cydia pomonella (Lepidoptera: Tortricidae) from Greece显示文摘 | Costas Ch. Voudouris Benoit Sauphanor Pierre Franck Maritza Reyes Zissis Mamuris John A. Tsitsipis John Vontas John T. Margaritopoulos | 2011 | Pesticide Biochemistry and Physiology2011，，3： | 1 |
| 5 | Improved clinical use of Twin-block and Herbst as result of radiating viscoelastic tissue forces on the condyle and fossa in treatment and lon~-term retention显示文摘 | Voudouris JC Kuffinec MM | 2000 | Growth Relatiritv2000，117，： | 1 |
| 6 | Does melatonin modulate betaendorphin,corticosterone,and pain threshold?显示文摘 | Barrett T Kent S Voudouris N | 2000 | Life Sci2000，66，6： | 1 |
| 7 | Geological, Mineralogical and Geochemi- cal Aspects for Critical and Rare Metals in Greece显示文摘 | Melfos V Voudouris P C | 2012 | Minerals2012，2，4： | 1 |
| 8 | Diagnosis of weathered coptic wall paintings in the Wadi El Natrun region, E- gypt显示文摘 | Moussa A B Kantiranis N Voudouris K S et / | 2009 | J Cuh Heri2009，10，： | 1 |
| 9 | Formation of aluminide coatings on nickel by a fluidised bed CVD process 显示文摘 | Voudouris N Christoglou Ch Angelopoulos G N | 2001 | Surface and Coatings Technology2001，141，： | 1 |
| 10 | Mathematieal Programming Techniques to Debottleneek the Supply Chain of Fine Chemical In- dustries 显示文摘 | Voudouris Vasilios T | 1996 | Computers and Chemieal Engineering1996，，20： | 1 |
| 11 | Deposition of aluminum on magnesium by a CVD process显示文摘 | CHRISTOGLOU C VOUDOURIS N ANGEL-OPOULOS G N PANT M DANL W | 2004 | Surface and Coatings Technology2004，198，23： | 1 |
| 12 | Mathematical programming techniques to debottleneck the supply chain of fine chemical industries 显示文摘 | Voudouris V T | 1996 | Computers and Chemical Engineering1996，，20： | 1 |
| 13 | Assessment of Intrinsic Vulnerability Using the DRASTIC Model and GIS in the Kiti Aquifer,Cyprus 显示文摘 | VOUDOURIS K KAZAKIS N POLEMIO M | 2010 | European Water2010，30，1： | 1 |
| 14 | Depo- sition of aluminium on magnesium by a CVD process 显示文摘 | Chistoglou C Voudouris N Angelopoulos G N | 2004 | Surface and Coatings Technology2004，184，23： | 1 |
| 15 | Shallow Submarine Epithermal Pb-Zn-Cu-Au-Ag-Te Mineralization on Western Milos Island, Aegean Volcanic Arc, Greece: Mineralogical, Geological and Geochemical Constraints 显示文摘 | Alfieris D Voudouris P Spry P G | 2013 | Ore Geology Reviews2013，53，： | 1 |
| 16 | Association of atheromatic factors with the intimal medial thickness (IMT)in high risk individuals for T2DM显示文摘 | Bakatselos S Voudouri P Chatzieleftheriou H | 2008 | Atheroscl Suppl2008，9，1： | 1 |
| 17 | Improved clinical use of Twin-block and Herbst as a result of radiating viscoelastic tissue forces on the condyle and fossa in treatment and long-term retention: growth rela- tivity 显示文摘 | Voudouris JC Knftinec MM | 2000 | Am J Orthod Dentofacial Orthop2000，117，3： | 1 |
| 18 | Implementation of finite-element codes for the simulation of ship-ship collisions显示文摘 | SERVIS D SAMUELIDES M LOUKA T VOUDOURIS G | 2002 | Journal of Ship Research2002，46，4： | 1 |
| 19 | Effectiveness of technology investment: impact of internal technological capability, networking and investment' s strategic importance 显示文摘 | VOUDOURIS I LIOUKAS S IATRELLI M | 2012 | Technovation2012，322，6： | 1 |
| 20 | Condyle-fossa modifications and muscle interactions during Herbst treatment显示文摘 | Voudouris J C Woodside D G Altuna G | 2003 | Orthod Dento facial Orthop2003，124，3： | 1 |
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