2 189 thinning setting and the formation associated with potassium high potassium or alkaline granitic rocks related to the lithosphere delamination a

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1 GLOBAL GEOLOGY Vol. 29 No. 2 Jun ~ 221 Ma 148 ~ 138 Ma 131 ~ 112 Ma ~ 221 Ma Pb Sr Nd Pb Au 148 ~ 138 Ma I Sr Ba Fe W 131 ~ 112 Ma W P A doi /j. issn Present status of research on molybdenum deposit in eastern Qinling and the problems remained ZHANG Yuan-hou MAO Jing-wen 1 JIAN Wei 4 LI Zong-yan 2 1. Institute of Mineral Deposits Chinese Academy of Geological Sciences Beijing China 2. Jinyuan Mining Industry Co. Ltd Lingbao Henan China 3. College of Earth Sciences Jilin University Changchun China 4. School of Earth and Resource Sciences China University of Geosciences Beijing China Abstract Western Henan located between the northern Qinling orogenic belt and the southern North China platform is one of the important molybdenum polymetallic and precious metal metallogenic belts in China. The previous work suggested that molybdenum deposits in the area are occurred in three stages including 233 ~ 221 Ma 148 ~ 138 Ma and 131 ~ 112 Ma. The authors summarized the types of molybdenum deposits and their tectonic setting types and age of magmatic rocks and age of molybdenum deposits and considered that the molybdenum deposits in the first stage occurred in continental extensional setting and their formation possibly associated with its contemporary alkaline rocks. The metallogenic materials are likely originated from Dongpo Formation in Qinling orogenic belt based on the isotopes of Pb Sr and Nd. The metallogenic elements are relatively simple characterized by Pb or Au. The second staged deposits are possibly formed in the process of crust thickening the remelting type and calc-alkaline rocks type I and the associated mainly with Fe and W. The third staged deposits formed in crust

2 2 189 thinning setting and the formation associated with potassium high potassium or alkaline granitic rocks related to the lithosphere delamination and the upwelling of asthenosphere in eastern China. Metallogenic element is locally enriched W. Key words molybdenum deposit tectonic setting western Henan eastern Qinling Mt 13 1a Sillitoe 15 2 Nazzac Sillitoe Exploration and discovery of base and precious metals deposits in the Circum Pacific region during the last 25 years 245 ~ 215 Ma Fig Schematic geological map of western Henan in southern margin of North China platform

190 29 Fig. 2 2 21 Schematic geological map of molybdenum deposits in eastern Qinling - Dabie orogenic belt 2 1 Cu Cu - Mo 16-18 1 21 14 13 22 0. 1% 0.

3 Fig Schematic geological map of molybdenum deposits in eastern Qinling - Dabie orogenic belt 2 1 Cu Cu - Mo % 0. 19% 21 Carten 19 Cl F 20 1 Cooke D R Davies A G S. Breccias in epithermal and porphyry deposits the birth and death of magmatic hydrothermal system. Beijing Presentation at the 8 th SGA Meeting

2 191 - Mo -W Mo -W -Fe S -W -Zn -Cu -Be 21 2-21 23 12 3 24 Fig.

4 Mo -W Mo -W -Fe S -W -Zn -Cu -Be Fig. 3 3 Evolution map of collision history between South and North China plates before Triassic

5 Ma 500 ~ 280 Ma ~ 457 Ma 514 Ma ~ O Kesler Han Sillitoe Ar - Ar ± 1. 9 Ma O ~ D Malmbeget Schonwandt Bordvika 611 ± 13 ~ 420 Ma 30 Sillitoe ± 11 Ma ~ Ma Westra Keith 31 Climax Henderson - ~ ± 3. 6 Ma 2 T Questa Emmons ~ 235 Ma ~ 235 Ma

2 193 K - Ar 202 ~ 206 Ma 27 A Ar -Ar 207 Ma 33 K -Ar 202 ~ 213 Ma 9 28 34 35 U -Pb 208 Ma 34 Ar -Ar 204 Ma 35 U -Pb SHRIMP U -Pb Ar -Ar Rb -Sr 210 ~ 217 Ma SHRIMP U -Pb 216. 6 ± 8.

6 2 193 K - Ar 202 ~ 206 Ma 27 A Ar -Ar 207 Ma 33 K -Ar 202 ~ 213 Ma U -Pb 208 Ma 34 Ar -Ar 204 Ma 35 U -Pb SHRIMP U -Pb Ar -Ar Rb -Sr 210 ~ 217 Ma SHRIMP U -Pb ± 8. 0 Ma Fig Distribution map of granitoid rocks in western Henan and its adjacent area Rb -Sr Ma Ar -Ar K -Ar 223 ~ 226 Ma ~ 217 Ma 39 Ar -Ar K -Ar 206 ~ 212 Ma 42 Yang 217 Ma 36 U -Pb 43 SHRIMP U ± 3 Ma 39 Pb 215 ± 5 Ma ± A 0. 3 ~ ± 0. 6 Ma 148 ~ 244 Ma ± 0. 2 Ma 206 Ma U -Pb SiO 2 Al 2 O 3 -

7 SiO 2 Al 2 O ~ Ba Sr I Sr ~ ~ 10 m δ 18 O > SHRIMP U ± Ma -Pb ± 6. 8 Ma ± ± ± 4. 7 Ma ± 5. 0 Ma A /CNK -A /NK I Sr ~ REE 37 K -Ar Rb -Sr ~ Ma Ar -Ar 101 Ma 39 Rb -Sr 123 Ma Ar -Ar 135 ~ 143 Ma Ar -Ar 165 Ma 178 ~ 102 Ma SHRIMP U -Pb 138 Ma 142 Ma 11 Ar -Ar 157 Ma 137 Ma Ma Ar -Ar 120 Ma SHRIMP U -Pb 127 Ma 133 ~ 147 Ma I Rb -Sr 133 Ma K -Ar 147 Ma SHRIMP U -Pb 115 Ma I Sr ~ δ 18 O Pb SHRIMP U -Pb ~ 148 Ma Ma ~ 102 Ma ~ 148 Ma ~ 132 Ma Ma 52

8 2 195 T ~ 211 Ma Mo ~ 221Ma Pb 12 Mo -W Mo -Pb -Zn -FeS Mo -W -Fe Mo -W -Pb -Zn Mo -Pb -Zn Ma ± Yang 43 SHRIMP U - Pb - Mao ~ 221 Ma 148 ~ 138 Ma 131 ~ 112 Ma 233 ~ 221 Ma Ma Re ± ~ 138 Ma 2. 9 ~ ± 2. 8 Ma I 60 Sr Ba Eu 231 ~ 127 Ma Eu 57 δ 18 O ± 2. 2 ~ ± 2. 3 Ma Mo -Pb -Zn Fe 142 Ma Ma 13 Mao 13 I Izanaqi 131 ~ 112 Ma I S SiO 2 > 72% Sr ± 1. 4 Ma ± 2. 2 Ma Han 122 Ma Ma 110 Ma Eu Eu Sr Re Mao

9 Wu 52 Mao C O Cooke 1 SiO 2 56% Al 2 O 3 15% MgO < 3% > 6% Y Yb Y Yb 1. 9 Cu 10-6 Sr > LREE Eu 87 Sr / 86 Sr < ε Nd > Cu - Au A1 Sr Y HREE ω Sr /ω Y 27 ~ 166 ω La /ω Yb 14 ~ 66 Eu adakite Tarney 65 Ba Sr Sr Dilles 68 Cline 69 Y 66 Cu - Mo -Au Mo -Au Sr Nd Sr Nd Cripple Creek Porgera Ladolam Sr Nd Emperor ~ 889 Ma 210 Ma ε Nd t - 2 ~ - 6 Sr i ~ ε Nd t - 22 ~ - 8 Sr i Mo Au Cooke 1 Sn W Mo W ~ ε Nd t 2008.

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km 5 km Pt 2 x 2 1 Au 65 ~ ~ km 5 km 10 km 2 Au Au

km 5 km Pt 2 x 2 1 Au 65 ~ ~ km 5 km 10 km 2 Au Au 38 1 2015 3 JOURNAL OF EAST CHINA INSTITUTE OF TECHNOLOGY Vol. 38 No. 1 Mar. 2015 doi 10. 3969 /j. issn. 1674-3504. 2015. 01. 002 1 2 1 2 3 1. 471000 2. 471000 3. 510640 9 P618. 51 A 1674-3504 2015 01-0012-11.