Geological characteristics and metallogenic model of Hewa gold deposit in southeastern Liaoning Province
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摘要:
河洼金矿位于华北克拉通东部的金成矿带中，地表有多条金矿化蚀变带，具有金矿床发育前提. 由于没有有效的深部勘查手段，虽然进行了大量的勘查研究工作，但对该地区地质认识有限. 本文在前人地质研究成果的基础上，结合广域电磁法及深部钻探成果，梳理永宁盆地地层地质特征，对不同深度成矿物质进行综合分析，对河洼地区金矿成矿特征及成矿模式形成新的认识，认为深度1 000 m左右的永宁组地层与下伏片麻岩接触界面及界面附近发育的张裂隙，甚至热液活动的所有部位均为有利成矿部位. 根据已有的金矿化蚀变规模推断，该地区具有很好的金成矿前景.
Abstract:Hewa gold deposit is located in the gold metallogenic belt in the eastern North China Craton. There are several gold mineralized belts on the surface, with the precondition for the development of gold deposit. Although a lot of exploration research work has been done, the geological understanding of this area is still limited due to lack of effective deep exploration means. Based on previous geological research, combined with wide field electromagnetic method and deep drilling results, this paper summarizes the stratigraphic geological characteristics of Yongning basin, comprehensively analyzes the metallogenic materials at different depths, and forms a new understanding of metallogenic characteristics and model of Hewa gold deposit. It is considered that the tensile fractures developed in and near the contact interface between Yongning Formation and underlying gneiss at a depth about 1 000 m, and even all the locations of hydrothermal activity are favorable for mineralization. According to the existing scale of gold mineralization, it is inferred that there is a good gold metallogenic prospect in the study area.
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表 1 浅部含金矿化蚀变岩带特征一览表
Table 1. Characteristics of shallow gold-bearing altered zone
编号 长度/m 宽度/m 矿化及蚀变 Au品位/10-6 产状 控制工程 Au1 300 0.10~1.00 褐铁矿化、硅化 1.78 293~300°/66~86° 探槽 Au2 310 0.05~0.10 黄铁矿、磁黄铁矿、闪锌矿化，硅化 0.04~2.70 100°/73°，275°/88° 浅部钻孔 Au3 480 0.15~0.30 黄铁矿、毒砂、黄铜矿、黝铜矿、铜蓝矿化，硅化 0.14~38.03 76~125°/69~85° 探槽、浅部钻孔 Au4 1120 0.15~0.70 褐铁矿化、硅化、黄铁矿化 0.03~19.60 102~147°/71~86° 探槽、浅部钻孔 Au5 1510 0.10~3.90 褐铁矿化、硅化 0.02~16.87 106~135°/77~86° 探槽、浅部钻孔 Au6 470 0.10~0.20 褐铁矿化、弱硅化 0.06~0.19 120°/82° Au7 260 0.15~1.30 褐铁矿、磁铁矿、黄铁矿化，硅化 0.44~4.64 102~125°/83~87° 探槽 Au8 300 0.5~1.3 褐铁矿化、硅化 0.23~0.24 270°/85°，93°/78° 探槽 Au9 300 0.5~1.1 褐铁矿化、硅化 0.12~0.30 278°/80° 探槽 Au10 40 0.62 褐铁矿化 0.13~7.44 284°/85° 探槽 Au11 40 0.50 褐铁矿化 0.12~6.14 285°/76° 探槽 Au12 250 0.10~1.0 褐铁矿化 0.24~0.50 315°/68° 探槽 Au13 约200 黄铁矿化、硅化、钼矿化 0.11~0.27 浅部钻孔 Au14 150 3 硅化、绢云母化、褐铁矿化 0.25 30°/75° Au15 20 3~5 硅化、绢云母化、褐铁矿化 0.40 130°/85° Au16 230 1~2 硅化、绢云母化、褐铁矿化 0.48 145°/75° Au17 20 3~5 硅化、绢云母化、褐铁矿化 0.22 5°/75° Au18 30 8~15 硅化、绢云母化、褐铁矿化 0.18~0.29 300°/75° Au19 50 5~10 硅化、绢云母化、褐铁、磁铁矿化 1.01 120°/75° Au20 80 8~15 硅化、绢云母化、褐铁、磁铁矿化 1.42 310°/80° Au21 100 2~3 硅化、绢云母化、褐铁矿化 0.76 115°/80° Au22 150 3~5 硅化、云英岩化、褐铁矿化 0.18 Au23 130 1~2 硅化、绢云母化、褐铁矿化 0.16 10°/70° Au24 200 5~8 硅化、绢云母化、褐铁矿化 0.18 150°/80° Au25 130 3~5 硅化、绢云母化、褐铁矿化 0.26~0.99 305°/75° 
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表 2 ZK1-1钻孔含金矿化蚀变岩带特征一览表
Table 2. Characteristics of gold-bearing altered zone in ZK1-1borehole
编号 深度/m 垂厚/m 矿化及蚀变 Au品位/10-6 Au平均品位/10-6 Au1 124.45~140.57 16.12 黄铁矿化、方铅矿化 0.17~0.78 0.36 Au2 214.38~217.36 2.98 硅化、绢云母化、褐铁矿化 0.25~0.38 0.32 Au3 250.50~252.78 2.28 黄铁矿化、碳酸盐化 0.22~0.30 0.26 Au4 291.09~294.29 3.20 绢云母化、黄铁矿化、方铅矿化 0.19~0.45 0.29 Au5 365.81~369.81 4.00 绢云母化、绿泥石化、黄铁矿化、碳酸盐化 0.18~0.27 0.17 Au6 408.51~417.51 9.00 方铅矿化、黄铁矿化 0.05~0.31 0.21 Au7 483.75~487.75 4.00 黄铁矿化、绿泥石化 0.10~0.37 0.21 Au8 518.89~520.89 2.00 黄铁矿化、绿泥石化 0.30~0.57 0.44 Au9 554.51~556.81 2.30 黄铁矿化 0.19~0.35 0.27 Au10 567.61~573.49 5.88 黄铁矿化、绿泥石化 0.18~0.36 0.26 Au11 676.88~683.88 7.00 硅化、碳酸盐化、黄铁矿化 0.08~0.35 0.20 Au12 698.88~704.88 6.00 黄铁矿化、硅化 0.22~3.34 0.76 Au13 841.08~846.08 5.00 黄铁矿化、硅化、绿泥石化 0.10~0.44 0.25 Au14 938.76~953.10 14.34 黄铁矿、黄铜矿、方铅矿、闪锌矿化，碳酸盐化 0.24~1.00 0.45 Au15 1367.31~1371.65 4.34 黄铁矿化、硅化、钾化 0.09~0.32 0.19 Au16 1396.40~1405.78 9.38 黄铁矿化、磁黄铁矿化、硅化、钾化、方铅矿化 0.04~1.71 0.31 Au17 1465.24~1468.24 3.00 黄铁矿化、黄铜矿化 0.97~1.31 1.17 Au18 1475.55~1480.75 5.20 黄铁矿化、硅化 0.09~0.89 0.33 Au19 1500.94~1503.44 2.50 硅化、钾化、黄铁矿化 0.09~0.23 0.14 Au20 1826.33~1833.16 6.83 黄铁矿化、磁铁矿化 0.10~0.27 0.20 Au21 1888.01~1889.01 1.00 黄铁矿化 1.06 1.06
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