Geochemical anomaly features and exploration prospect of polymetallic deposits in the Pulao area, Laos
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摘要:
普老地区Pb、Zn、Sn多金属异常区位于老挝北部长山成矿带，1∶5万水系沉积物地球化学测量发现了以Pb、Sn为主，伴生Zn、Ag、W、Sb、Bi、As、Hg、Cu、Au等元素异常。1∶1万土壤地球化学测量圈定了3个综合异常带，Pb、Zn、Sn等元素具有异常强度高、规模大、浓集中心明显的特点，经异常检查发现铅锌、锡多金属矿化点13处。研究和分析异常区元素的地球化学分布和异常特征，认为该区多金属异常为矿致异常，具有寻找热液型铅锌、锡及多金属矿的潜力。
Abstract:Pb, Zn, Sn polymetallic anomalous zones of the Pulao area are situated in the Changshan ore-forming belt in northern Laos. 1:50000 stream sediment geochemical survey identified major anomalies of Pb and Sn, accompanied by other anomalies of Zn, Ag, W, Sb, Bi, As, Hg, Cu and Au. 1:10000 soil geochemical survey delineated 3 comprehensive anomalous zones of Pb, Zn and Sn, which are characterized by high intensity and big size with distinct concentration centers. Test of the anomalies gave rise to 13 Pb, Zn, Sn polymetallic ore spots. Based on study and analysis of geochemical distribution of elements in the anomalous zones and their anomalous features, the authors hold that the polymetallic anomalies are related to mineralization, with potential in search for Pb, Zn, Sn and polymetallic deposits in the area.
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Keywords:
- geochemical anomaly /
- hydrothermal deposit /
- Changshan metallogenic belt /
- Laos
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致谢: 在本文的编写过程中,得到安徽地矿投资集团有限公司总工程师侯明金博士的精心指导和帮助; 审稿人对本文进行了详细的审阅,为本文的修改提供了重要的帮助。在此一并致以诚挚的感谢。
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图 1 老挝及邻区构造单元划分图
Ⅰ—保山掸泰地块；Ⅰ1—临昌—会晒微地块；Ⅱ—思茅—南邦地块；Ⅱ1—景洪—南塔岛弧带；Ⅱ2—思茅—难府微陆块；Ⅲ—南海印支地块；Ⅲ1—墨江—黎府岛弧带；Ⅲ2—万象—昆仑微陆块；Ⅲ3—长山微陆块；Ⅲ4—桑努岛弧带；Ⅳ—华南地块；[Ⅰ]—昌宁—清迈缝合带；[Ⅱ]—琅勃拉邦—程逸缝合带；[Ⅲ]—马江缝合带；F1—澜沧江—班南坎断裂；F2—南本河断裂；F3—墨江—程逸断裂；F4—孟卡西—普雷山断裂；F5—长山—岘港断裂；F6—孟帕—蓝江断裂；F7—马江断裂
Figure 1. Division of structural units in Laos and neighboring areas
Ⅰ-Baoshanchantai Block,Ⅰ1-Linchang-Huishai Micro block; Ⅱ-Simao-Nanbang Block; Ⅱ1-Jinghong-Nanta Island Arc Belt; Ⅱ2-Simao-NanfuMicroblock; Ⅲ-South Sea Indo-China Block; Ⅲ1-Mojiang-Lifu Island Arc Belt; Ⅲ2-Vientiane-Kunlun Microblock; Ⅲ3-ChangshanMicroblock; Ⅲ4-Sanno Island Arc Belt; Ⅳ-South China Block; [Ⅰ]-Changning-Chiangmai Collision Belt; [Ⅱ]-Louangphrabang-ChengmianCollision Belt; [Ⅲ]-Majiang Collision Belt; F1-Nancangjiang-Bannankan Fault; F2-Nanbenhe Fault; F3-Mojiang-Chengmian Fault;F4-Mengkaxi-Puleishang Fault; F5-Changshan-DaNang Fault; F6-Mengpa-Lanjiang Fault; F7-Majiang Fault
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图 3 1:5 万水系沉积物综合异常图(附地质简图)
1—寒武系—志留系; 2—泥盆系—石炭系; 3—花岗岩; 4—大理岩化; 5—正断层; 6—平移断层;7—地层界线; 8—异常编号; 9—Pb元素异常(50×10-6); 10—Sn元素异常(8×10-6);11—Zn元素异常(200×10-6); 12—Ag元素异常(0.2×10-6); 13—W元素异常(6×10-6)
Figure 3. 1:50000 stream sediments comprehensive anomalies map (with geological sketch map)
1-Cambrain-Silurain,2-Davonian-Carbonifereous;3-Granite;4-Marblic alteration;5-Normal fault;6-Wrench fault;7-Stratigraphical boundary;8-Serial number of anomaly;9-Pb anomaly (50×10-6);10-Sn anomaly (8×10-6);11-Zn anomaly (200×10-6);12-Ag anomaly (0.2×10-6);13-Wanomaly (6×10-6)
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图 4 普老地区地质、地球化学(土壤)异常剖析图
1—志留系关底组; 2—寒武系龙王庙组; 3—寒武系沧浪铺组; 4—地层界限; 5—不整合界线; 6—正断层; 7—平移断层; 8—铅锌矿点
Figure 4. Geological and geochemical (soil) anomaly resolution map for the Pulao area
1-Guandi Formation of Silurian；2-Longwangmiao Formation of Cambrian；3-Canglangpu Formation of Cambrian；4-Stratigrapy boundary；5-Uncomfomity；6-Normal fault；7-Wrench fault；8-Ore spots of Zn and Pb
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