Geochronology and Ore Prospecting Potential of Qushenla Formation in Middle Segment of Bangong Co-Nujiang Suture Zone, Tibet
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摘要: 作为班公湖-怒江结合带最为重要的火山岩沉积地层之一,去申拉组一直缺乏精细的年代学研究和找矿潜力的分析.基于班-怒结合带中段尼玛县北部长期的矿产地质调查工作,对热过勒、饿蒙勒、阿俄作登等地区的去申拉组进行了详细解剖,并利用锆石U-Pb定年精细厘定区内去申拉组中英安岩、安山岩的结晶时限分别为106.2±1.3 Ma、107.7±1.4 Ma,属于早白垩世火山活动的产物.同时,区内1:5万水系沉积物异常以及实地调查揭示,阿俄作登和饿蒙勒地区存在良好铜、金、银组合异常,初步揭露1条高品位的矿化体.结合区域成矿作用背景分析,认为该区存在良好的斑岩-浅成低温热液型铜多金属成矿系统的找矿潜力.班公湖-怒江结合带去申拉火山沉积地层的形成时限的精确厘定,为区域基础地质格架的构建提供了直接证据;而其矿化信息的首次揭露,为该带早白垩世大面积覆盖的火山岩地区的勘查找矿工作指明了新方向.Abstract: The Qushenla Formation is one of the most important volcanic strata in Bangong Co-Nujiang suture zone, however, there is no detailed geochronology and prospecting potential study. Based on long-term ore geological survey in Nima County, we do a detailed study on the Qushenla Formation in Reguole, Emengle, Aezuodeng areas, and date the dacite and andesite in Qushenla Formation with U-Pb age of zircons. They are 106.2±1.3 Ma and 107.7±1.4 Ma, respectively, as the result of Early Cretaceous magmatism. At the same time, good Cu, Au, Ag anomalies and one high-grade copper-bearing mineralized body were found in Aezuodeng and Emengle areas, according to the 1:50 000 stream sedimentary analysis. Given the regional metallogenic background, we suggest this area is a good prospecting target for porphyry-epithermal copper system exploration. The precise geochronology of Qeshenla Formation gives the direct evidence for the framework building of regional strata. The first discovery of the mineralization in Qushenla Formation reveals a new direction for the further exploration and prospecting in the large area of the Bangong Co-Nujiang suture zone covered volcanic rocks.
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Key words:
- Qushenla Formation /
- geochronology /
- porphyry-epithermal /
- Bangong Co-Nujiang suture zone /
- Tibet
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图 1 班-怒结合带去申拉组分布情况(a)和尼玛地区去申拉组地质简图(b、c、d)
年龄数据引自西藏自治区地质调查院, 2002, 中华人民共和国1︰25万区域地质调查报告班戈县幅;四川省地质调查院, 2006, 中华人民共和国1︰25万区域地质调查报告物玛幅;河南省地质调查院, 2002, 中华人民共和国1︰25万区域地质调查报告尼玛幅;四川省地质调查院, 2003, 中华人民共和国1︰25万区域地质调查报告革吉县幅;吉林省地质调查院, 2006, 中华人民共和国1︰25万区域地质调查报告帕度错幅;李伟(2012);吴浩等(2013).1.第四系;2.新近纪康托组;3.晚白垩世竟柱山组;4.早白垩世去申拉组;5.晚侏罗世沙木罗组;6.早中侏罗世木嘎岗日岩群;7.石英闪长岩;8.铜矿化体;9.采样位置;10.地层界线;11.角度不整合界线;12.逆断层;13.剖面位置
Fig. 1. Distribution of Qushenla Formation in Ban-Nu suture zone(a) and geological map of Nima area(b, c, d)
表 1 去申拉组火山岩中锆石U-Pb测年结果
Table 1. U-Pb dating results of zircons from Qushenla Formation
测点号 含量(10-6) Th/
U比值 年龄(Ma) 谐和度
(%)Th U 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 206Pb/238U 1σ AE-b1-2 349 366 1.0 0.110 7 0.010 1 0.016 9 0.000 5 106.6 9.2 108.1 3.1 98 AE-b1-3 190 236 0.8 0.111 0 0.016 2 0.016 1 0.000 6 106.9 14.8 103.0 3.6 96 AE-b1-4 243 282 0.9 0.120 4 0.014 2 0.017 4 0.000 5 115.4 12.8 111.0 3.4 96 AE-b1-5 228 259 0.9 0.124 3 0.015 5 0.017 1 0.000 6 118.9 14.0 109.2 3.7 91 AE-b1-6 300 332 0.9 0.114 2 0.013 2 0.016 3 0.000 5 109.8 12.0 104.5 3.3 95 AE-b1-7 207 250 0.8 0.108 5 0.014 1 0.016 4 0.000 6 104.6 13.0 104.8 3.5 99 AE-b1-8 222 266 0.8 0.110 8 0.013 6 0.015 9 0.000 5 106.7 12.4 101.8 3.1 95 AE-b1-10 219 271 0.8 0.108 8 0.013 9 0.016 3 0.000 6 104.9 12.7 104.4 3.5 99 AE-b1-11 220 255 0.9 0.119 1 0.014 2 0.016 9 0.000 6 114.2 12.9 108.0 3.7 94 AE-b1-12 231 245 0.9 0.107 2 0.010 1 0.016 6 0.000 6 103.4 9.3 106.0 3.6 97 AE-b1-14 341 337 1.0 0.109 0 0.015 3 0.017 1 0.000 5 105.1 14.1 109.1 2.9 96 AE-b1-15 377 389 1.0 0.112 9 0.011 5 0.016 7 0.000 4 108.6 10.5 106.7 2.7 98 AE-b1-16 142 196 0.7 0.104 2 0.018 5 0.016 5 0.000 6 100.7 17.0 105.5 3.7 95 AE-b1-18 229 260 0.9 0.094 6 0.011 1 0.015 3 0.000 5 91.8 10.3 97.9 3.0 93 AE-b1-19 330 350 0.9 0.109 9 0.012 0 0.016 1 0.000 4 105.9 10.9 102.8 2.6 97 AE-b1-20 301 304 1.0 0.106 4 0.012 2 0.017 2 0.000 5 102.7 11.2 110.2 3.3 92 AE-b1-22 170 205 0.8 0.122 3 0.011 5 0.016 6 0.000 6 117.2 10.4 106.4 3.7 90 AE-b1-23 239 271 0.9 0.113 0 0.011 2 0.017 1 0.000 5 108.7 10.2 109.1 3.4 99 AE-b1-24 193 210 0.9 0.114 7 0.013 3 0.017 4 0.000 6 110.3 12.1 111.4 3.9 99 AE-b1-26 232 262 0.9 0.118 4 0.013 2 0.016 3 0.000 5 113.6 12.0 104.0 3.2 91 AE-b1-27 166 203 0.8 0.120 2 0.012 3 0.016 8 0.000 7 115.2 11.1 107.6 4.3 93 AE-b1-29 303 333 0.9 0.122 3 0.010 3 0.016 6 0.000 5 117.2 9.3 106.4 3.4 90 AE-b1-30 180 197 0.9 0.126 8 0.020 5 0.017 4 0.000 6 121.2 18.4 111.2 4.1 91 AE-b1-31 236 278 0.9 0.112 3 0.010 8 0.016 3 0.000 5 108.1 9.8 104.5 3.1 96 AE-b1-32 293 281 1.0 0.110 2 0.012 0 0.017 1 0.000 5 106.2 11.0 109.1 3.1 97 EM-b3-1 281 398 0.7 0.113 3 0.012 0 0.016 8 0.000 4 109.0 10.9 107.5 2.5 98 EM-b3-5 456 528 0.9 0.104 9 0.012 3 0.016 3 0.000 4 101.3 11.3 104.0 2.5 97 EM-b3-8 333 474 0.7 0.104 9 0.010 6 0.016 9 0.000 4 101.3 9.8 107.7 2.7 93 EM-b3-9 314 417 0.8 0.107 8 0.012 5 0.017 2 0.000 5 103.9 11.5 110.1 3.2 94 EM-b3-10 358 451 0.8 0.119 3 0.010 7 0.016 4 0.000 4 114.4 9.7 104.8 2.8 91 EM-b3-12 239 375 0.6 0.109 9 0.012 2 0.017 1 0.000 5 105.9 11.1 109.5 3.0 96 EM-b3-14 176 251 0.7 0.116 6 0.016 1 0.016 5 0.000 5 112.0 14.6 105.7 3.0 94 EM-b3-15 276 437 0.6 0.122 8 0.011 7 0.017 4 0.000 5 117.6 10.6 111.1 2.9 94 EM-b3-16 490 555 0.9 0.111 9 0.011 4 0.016 8 0.000 5 107.7 10.4 107.7 3.0 99 EM-b3-17 176 238 0.7 0.108 6 0.017 2 0.017 1 0.000 7 104.7 15.7 109.5 4.6 95 EM-b3-18 247 359 0.7 0.114 2 0.011 8 0.017 0 0.000 5 109.8 10.7 108.7 3.1 98 EM-b3-19 410 502 0.8 0.109 7 0.011 7 0.016 8 0.000 4 105.7 10.7 107.5 2.8 98 EM-b3-20 209 267 0.8 0.116 5 0.013 0 0.017 1 0.000 6 111.9 11.9 109.3 4.0 97 EM-b3-25 241 341 0.7 0.108 0 0.014 7 0.016 8 0.000 5 104.2 13.5 107.2 3.1 97 EM-b3-26 259 245 1.1 0.106 4 0.015 4 0.016 6 0.000 5 102.7 14.1 106.1 3.4 96 EM-b3-27 234 314 0.7 0.111 3 0.010 8 0.017 0 0.000 5 107.2 9.9 108.8 3.4 98 EM-b3-31 318 413 0.8 0.116 0 0.009 9 0.017 2 0.000 5 111.4 9.0 110.2 3.1 98 注:AE-b1编号为阿俄作登地区英安岩,EM-b3编号为饿蒙勒地区安山岩. -
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