| 河南新县大银尖钼矿床成岩成矿作用地球化学及地质意义 |
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| 关键词:Dabie Mountain adamellite S isotope, Sr-Nd-Pb isotopes petrogeochemistry Dayinjian Mo deposit |
| 基金项目:地质过程与矿产资源国家重点实验室开放课题(编号: GPMR201014); 河南省国土资源厅2007年度省“两权价款”地质科研计划项目(项目编号: 2882) |
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| Geochemistry of Mineralization and Granitic Magmatism of Dayinjian Mo deposit, Xinxian County, Henan Province and Its Geological Significance |
| The Dayinjian Mo deposit located on the northern margin of the Dabie metamorphic core complex rock belt is a typical quartz vein-skarn Mo mineralization related to granitic magmatism. The authors studied petrogeochemistry of Dayinjian mineralized monzonite granite and Pb and S multielement isotopic trace of granite and ores. δ34S values of the sulfides range between 5.26 and 6.30 per mil, and vary insignificantly with the location and type in the ore deposit. the high δ34S values of granite suggest intense degassing of H2S of granitic melt. The low radioactivity-generated Pb isotopic composition of mineralized granite and ores (206Pb/204Pb)t: 16.876~16.732, (207Pb/204Pb)t: 15.206~15.321, (208Pb/204Pb)t: 37.570~37.271 and the high (87Sr/86Sr)i(0.7237), very low εNd(t) (-20.1)and high T2DM(2.4 Ga) of the mineralized granite indicate that the granite and ore-forming materials were derived from partial melting of low-middle crust composed of old Dabie metamorphic complex rocks. According to geochemical characteristics of Dayinjian granite such as relatively low Sr (<50×10-6) and high Yb (>1.8×10-6) content, comparatively strong negative Eu anomaly (δEu<0.5), rather low (La/Yb)N (7.8~9.6)and sea gull-shaped REE distribution pattern, together with the newest geochronologic data, it can be concluded that the magmatism and mineralization of the Dayinjian Mo deposit were related to partial melting of the continental crust with normal thickness after extension and thinning of Dabie orogen, and seemed to be the surface response to the deep dynamic process of lithospheric delamination and thinning in the Dabie orogenic belt. |
| YANG Mei-zhen,ZENG Jian-nian,LI Fa-ling,PAN Si-dong,LU Jian-pei,REN Ai-qun.2011.Geochemistry of Mineralization and Granitic Magmatism of Dayinjian Mo deposit, Xinxian County, Henan Province and Its Geological Significance[J].Acta Geoscientica Sinica,32(3):279-292. |
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