地质力学学报2016，Vol.22Issue(2)：294-309,16.
白秧坪铅锌多金属矿集区东矿带成矿地球化学作用与成矿年龄
GEOCHEMICAL CHARACTERISTICS AND METALLOGENIC AGE OF THE EAST ORE BELT IN BAIYANGPING POLYMETALLIC ORE CONCENTRATION AREA
摘要
Abstract
By studying the C, O and Sr isotopic characteristics of calcites in ore-forming stage, the S and Pb isotopic characteristics of sulfides, and the Sm-Nd dating of calcite in mineralization period, we discussed the ore genesis of the east belt in Baiyangping ore concentration area. Test results show that the δ13 CPDB values of calcite range from -4. 0‰ to -2. 3‰ with the average of-0. 2‰, the δ18 OPDB values range from -27. 2‰ to 20. 4 ‰ with the average of -14. 1‰, theδ18 OSMOW values range from 2. 9‰to 24. 4‰with the average of 16. 4‰, and the Sr isotopic values of calcite are between 0. 707669 and 0. 710115 with the average of 0. 709320. The δ34 SV-CDT values of sulfides distribute in the range of -20. 2 ‰ to 1. 3 ‰ with the average of about -8. 8‰, and the δ34 SV-CDT values of celestine distribute in the range of 17. 1‰to 19. 4‰with the average of about 18. 0‰. The Pb isotope test results yield 206 Pb/ 204 Pb values of 18. 553~18. 857 , 207 Pb/ 204 Pb values of 15. 501 ~15. 826 and 208 Pb/ 204 Pb values of 38. 54 ~39. 456 , and the Sm-Nd isochron age of calcite in mineralization stage is 29. 5 ± 1. 7 Ma. The results indicate a homogeneous carbon source in the east ore belt, and the carbon in hydrothermal calcite is derived from the dissolution of carbonate rock strata. The ore-forming fluids are from formation water and precipitate water, which are belonged to the basin brine fluid system. The sulfur is from organic thermal chemical sulfate reduction in the early mineralization stage and biological sulfate reduction in the late mineralization stage. And the metal mineralization material is from sedimentary strata and basement. The dating results show that the Pb-Zn mineralization of the east ore belt occurred at 29. 5 ± 1. 7 Ma ago, which is consistent with the constrainted geological age.关键词
兰坪盆地/白秧坪矿集区/东矿带/铅锌/地球化学/成矿年龄Key words
Lanping basin/Baiyangping ore concentration area/the east ore belt/lead-zinc/geochemical feature/metallogenic age分类
天文与地球科学引用本文复制引用
王晓虎,宋玉财,张洪瑞,刘英超,潘小菲,郭涛..白秧坪铅锌多金属矿集区东矿带成矿地球化学作用与成矿年龄[J].地质力学学报,2016,22(2):294-309,16.基金项目
国家自然科学基金项目（41302067，41472067，41403043）；中国地质科学院中央级公益性科研院所基本科研业务费项目 （）
