The source of CO_2 in lamprophyres from Laowangzhai gold orefield, Yunnan Province, China

查看全文 作　　者：HUANG Zhilong, LIU Congqiang and XIAO Huayun Open Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinses Academy of Sciences, Guiyang 550002. China 出　　处：《Chinese Science Bulletin》索引1999年第44卷第S2期,共3页 摘　　要：CARBONATES in lamprophyres have various occurrences. The source of CO₂ in lamprophyres provides animportant clue for us to understand the relationship between lamprophyres and gold mineralization.Demeny et al.determined the C and O isotopic composition of various carbonates from Mesozoic lamprophyres in Transdanubian Range of Hungary, and suggested that the carbonates with different occurrences were different in origin. That is to say, the CO₂ in lamprophyres has various sources. TheLaowangzhai gold deposits, Yunnan Province, China, is a typical orefield where lamprophyres are temporally and spatially related to gold mineralization. The CO₂ contents of relatively fresh lampropyres from theorefield (the range of content is 5.10%-9.56%, averaging 7.45% ) are obviously higher than that ofprimary lamprophyres (about 0.5%). Huang et al.considered that the CO₂ in relatively fresh lam- 关 键 词：SOURCE of CO₂ LAMPROPHYRES gold FIELD Yunnan Province.