[an error occurred while processing this directive] Global Geology 2021, 24(1) 1-14 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Article by Nie X
Article by Zhang Y
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 Geochronology of mineralization and tectonic setting of Baishidong skarn- type iron deposit in Helong area of Yanbian,Jilin Province,NE China
 NIE Xitao, ZHANG Yajing, WANG Fuliang and SU Zumin 1. Personnel Division,Changchun University,Changchun 130022,China;
2. College of Earth Sciences,Jilin University,Changchun 130061,China;
3. Geological Survey of Jilin Province,Changchun 130061,China
 1. Personnel Division,Changchun University,Changchun 130022,China;
2. College of Earth Sciences,Jilin University,Changchun 130061,China;
3. Geological Survey of Jilin Province,Changchun 130061,China
Abstract:
 The Baishidong iron deposit is the only skarn-type iron deposit discovered in the study area. Accord-
ing to mineral assemblage and paragenesis,the mineralization can be divided into four metallogenic stages: ear-
ly garnet-diopside skarn stage,late magnetite-tremolite-epidote skarn stage,early quartz-pyrite-chalcopyrite
stage and late quartz-calcite-pyrite stage. Through LA-ICP-MS zircon U-Pb dating of diorite,which is closely
related to mineralization,the results show that the weighted average age is 164. 6 ± 1. 4 Ma,which limits the
mineralization time of Baishidong iron deposit during or slightly later than Middle Jurassic. The diorite rocks are
rich in sodium (Na 2 O/K 2 O = 1. 24--1. 76),aluminium (Al 2 O 3 = 17. 41%--18. 76%),LREE and large-ion
lithophile elements (Ba,K and Sr),depleted in HREE and high-field-strength elements (Y,Nb,Ta,P and
Ti),and show strongly fractionated patterns (LREE/HREE =6. 58--9. 93),no apparent Eu anomalies (δEu =
0. 91--1. 13),which shows similar characteristics to island arc or active continental margin arc magma. The zir-
con εHf(t) values range from -22. 6 to 5. 9,and the age of the two-stage model (t DM2 ) is 836--2 633 Ma.
Above data combined with the geochemical characteristics,it is indicated that the magma was a mixture of mul-
tiple sources,composed of ancient materials and newly formed crust. During the process of evolution and ascending of magma,separation and crystallization occurred,and a large amount of continental crust material was mixed at the same time. Combined with regional tectonic evolution,the formation of this deposit may be related to the westward subduction of the Paleo-Pacific Plate to the Eurasian Plate. 
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