Progress of Research on Metallogenic Regularity and Deep Exploration in Nanling Region and Its Indication for W-Sn Exploration in Tibet
详细信息
- 责任者：Li Jiankang (Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Wang Denghong
- 刊名：Acta Geoscientica Sinica
- 出版年：2013
- 卷期：34(1)
- 关键词：钨矿 ; tungsten ores ; 锡矿 ; tin ores ; 南岭 ; Nanling Mountains ; 西藏 ; Tibet
- 页码：p.58-74
- 图表：illus., 1 table, 41 refs.
- 分类号：1001
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
In this paper,through a comparative study of the geological and geochemical features of the typical ore concentration areas,the authors summarized the evolution of the crust and regional metallogenic regularities in the western,middle and eastern regions of the Nanling metallogenic belt.In the western region,magmas intruded into the late Paleozoic and early Mesozoic crust in a short time with an explosive type Sn mineralization in late Yanshanian epoch;in the middle region,magmas intruded into the late Paleozoic crust for a long time accompanied by polymetallic and multi-stage mineralization;in the eastern region,magmas intruded into early Paleozoic crust with the W mineralization peak in Yanshanian epoch,indicating that W mineralization might have occurred in the early Paleozoic crust of the western Nanling region.Correspondingly,the concealed granite,the Shizhuyuan-type deposit under Huangshaping type deposit,and the "basement" under the "five-storey" type W deposit should be the deep exploration targets in the western,middle and eastern Nanling regions,respectively.In addition,the deep exploration across the Qitianling intrusion in southern Hunan Province shows the existence of an upwelling pathway for mantle material indicated by artificial earthquake test at the center of the intrusion,where the later fine-grained granite contained more mantle material than the early coarse-grained granite in the light of Os isotope.In addition,the Sn-rich rhyolite subvolcanic rock vein that intruded into the early coarse grained granite in the Bailashui Sn deposit is a indicator of a later magmatism characterized by enrichment of mantle materiald in the depth of Qitianling intrusion.These metallogenic regularities in Nanling have indicating significance for W-Sn exploration in Tibet,i.e.,to explore W-Sn mineralization in the depth of epi-mesothermal deposits in low erosion areas,and to explore the meso-hypothermal W-Sn deposits in the high erosion areas.
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