Geochronology and geochemistry of the Hekoulinchang Sn-Pb-Zn-Ag polymetallic deposit(73240 t) in Heilongjiang Province, China  

作　　者：Yong Zhang Quan-heng Song Shi-jiong Han Jian-hua Ding 

机构地区：[1]Ministry of Natural Resources Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China [2]Institute of Geological Survey of Jilin Province,Changchun 130061,China [3]College of Earth Sciences,Jilin University,Changchun 130061,China

出　　处：《China Geology》2022年第1期46-59,共14页中国地质（英文）

基　　金：supported by the Chinese Central Government for Basic Scientific Research Operations in Commonwealth Research Institutes(KK 2013,KK2105);the Chinese Geological Survey Program(DD20190193,DD20211410);the National Key Research and Development Program of China(2017YFC0601303);the National Natural Science Foundation of China(41602075,41602066)。

摘　　要：The Hekoulinchang Sn-Pb-Zn-Ag polymetallic deposit(20000 t Sn at 0.27%,236 t Ag at 122.89 g/t,15000 t Pb at 0.84%,and 38000 t Zn at 1.43%)is located in the Wandashan Terrane of the easternmost segment of the Central Asian Orogenic Belt.The timing of Sn-Pb-Zn-Ag polymetallic mineralization remains unclear due to a lack of precise isotope dating directly conducted on ore minerals.The authors herein report that the LA-ICP-MS U-Pb ages of cassiterite and zircon from the granite porphyry in the Hekoulinchang Sn-Pb-Zn-Ag polymetallic deposit are 101.4±7.9 Ma and 115.4±1.0 Ma,respectively,indicating that Sn mineralization and magmatism occurred during the Early Cretaceous.The granite porphyry belongs to the subalkaline series peraluminous I-type granites that are depleted in Nb,Ta,and Ti and enriched in Rb,Th,U,and Pb.TheεHf(t)values of the granite porphyry range from 0.9 to 7.4,with an average of about 5.6 and two-stage model ages(T_(DM2))of 705–1116 Ma,with an average age of 819 Ma.The ε_(Nd)(t)values of the apatites are–1.60–0.45,with an average of–0.9,and two-stage model ages(T_(DM2))of 872–1040 Ma,with an average age of 983 Ma.The Nd-Hf isotope data indicate that the magma may have been derived from the partial melting of juvenile crustal material.

关 键 词：Cassiterite U-Pb dating Zircon U-Pb dating Nd-Hf isotopes Porphyry Sn-Pb-Zn-Ag polymetallic deposit Hekoulinchang Heilongjiang Province Central Asian Orogenic Belt 

分 类 号：P618.2[天文地球—矿床学]