湖南锡田成矿远景区锡矿找矿突破与找矿标志的建立——湖南锡田地区锡铅锌多金属矿远景调查成果

Prospecting Progress and Indicators of the Tin Deposits in Xitian Metallogenic prospect area of Hunan Province—Prospective Survey Achievements of the Tin-Lead-Zinc Polymetallic deposit in Xitian,Hunan Province

锡田地区位于南岭钨锡铅锌多金属成矿带湖南段东部北缘,大地构造位置属与扬子板块与华夏板块的接合带,成矿大地构造背景较好。本项目为中国地质调查局2007年批准的国土资源大调查项目,工作部署按照1∶5万矿产地质调查、矿区评价、勘查示范、靶区验证、综合研究等五个方面开展工作。通过一系列的勘查与研究工作,建立了锡田地区成矿地质模型,提出"三位一体"控矿模型,划分了锡田岩体成岩时代,确定了锡田地区找矿标志,并计算出了锡田地区钨锡资源量(332+333+334)为30.18万吨。然而,锡田地区很多矿脉停留在预查阶段,建议进一步加大锡田地区的投入力度,提高其资源量级别。

The Xitian area is located at the northern margin of the east Hunan section in Nanling tungsten-tin- lead-zinc polymetallic metallogenic belt, and its geotectonic location is the junction belt between Yangtze Plate and Cathaysian Plate which has favorable metallogenic geological background. As an important territorial resources survey project approved by China Geological Survey in 2007, this project has deployed five aspects work as follows： 1：50000 geological and mineral resources survey, ore area estimate, exploration demonstration, target verification, and comprehensive study. After a series of explorations and studies, we established the metallogenic geological model in Xitian area, brought forward the concept of ＂ trinity ore-control system＂, determined the intrusive petrogenic age, determined the prospecting indicators, and figured out 301800 tons of tungsten and tin ore resources （332 ＋ 333 ＋ 334）. However, as many mineral veins are still in pre-survey stage, we propose to increase exploration investment in further and to improve the resource level of Xitian area.