Maoling gold deposit is hosted in the Second Member of Gaixian Formation, which is mainly phyllonitized sericite phyllite with interbed sericite quartzite. Four altered zones with gold mineralization are delineated....Maoling gold deposit is hosted in the Second Member of Gaixian Formation, which is mainly phyllonitized sericite phyllite with interbed sericite quartzite. Four altered zones with gold mineralization are delineated. Gold is mainly hosted in arsenopyrite, pyrrhotite, pyrite and minor in galena and quartz. Ore δ ( 34 S) is characterized by concentrating heavy sulfur. δ ( 18 O) and δ (D) of fluid inclusions in quartz have the same ranges as those in wall rocks, suggesting that metamorphic hydrothermal solution and meteoric water may be involved in the formation of the deposit. Moreover, deep faults and that some deep derived ore forming materials seem to play more important role.展开更多
The Maoling gold deposit, one of the large gold deposits in eastern Liaoning Province, NE China, is an ar- senopyrite-disseminated gold deposit with a resource of ap- proximately 25 t Au and an average Au grade of 3.2...The Maoling gold deposit, one of the large gold deposits in eastern Liaoning Province, NE China, is an ar- senopyrite-disseminated gold deposit with a resource of ap- proximately 25 t Au and an average Au grade of 3.2 g/t. Six arsenopyrites closely related to Au mineralization of the Maoling gold deposit are dated by Re-Os technique and de- fine a Re-Os isochron with an age of 2316±140 Ma, which suggests that the deposit was formed in the Paleoproterozoic era rather than in the Indosinian period as some early re- searchers suggested. High initial 187Os/188Os ratio of 1.32±0.48 indicates a crustal derivation of the ore-forming material of the deposit, which may be derived from rocks of the Gaixian formation of the Liaohe Group. Furthermore, the result also implies that the age of the Gaixian Formation in the Maoling district is older than 2316±140 Ma.展开更多
文摘Maoling gold deposit is hosted in the Second Member of Gaixian Formation, which is mainly phyllonitized sericite phyllite with interbed sericite quartzite. Four altered zones with gold mineralization are delineated. Gold is mainly hosted in arsenopyrite, pyrrhotite, pyrite and minor in galena and quartz. Ore δ ( 34 S) is characterized by concentrating heavy sulfur. δ ( 18 O) and δ (D) of fluid inclusions in quartz have the same ranges as those in wall rocks, suggesting that metamorphic hydrothermal solution and meteoric water may be involved in the formation of the deposit. Moreover, deep faults and that some deep derived ore forming materials seem to play more important role.
基金supported by the State Key Basic Research Program(Grant No.01999043201)the Hefei Analysis Foundation of Chinese Academy of Sciences.
文摘The Maoling gold deposit, one of the large gold deposits in eastern Liaoning Province, NE China, is an ar- senopyrite-disseminated gold deposit with a resource of ap- proximately 25 t Au and an average Au grade of 3.2 g/t. Six arsenopyrites closely related to Au mineralization of the Maoling gold deposit are dated by Re-Os technique and de- fine a Re-Os isochron with an age of 2316±140 Ma, which suggests that the deposit was formed in the Paleoproterozoic era rather than in the Indosinian period as some early re- searchers suggested. High initial 187Os/188Os ratio of 1.32±0.48 indicates a crustal derivation of the ore-forming material of the deposit, which may be derived from rocks of the Gaixian formation of the Liaohe Group. Furthermore, the result also implies that the age of the Gaixian Formation in the Maoling district is older than 2316±140 Ma.
