The concept of fault junction is proposed to describe the relationship between the two faults by the authors. The junction relationship between Ganjiang and Tanlu faults is analyzed in this paper, and this has been el...The concept of fault junction is proposed to describe the relationship between the two faults by the authors. The junction relationship between Ganjiang and Tanlu faults is analyzed in this paper, and this has been elucidated through numerical simulation about the tectonic stress field analysis. Numerical simulation of the tectonic stress field conducted for the major mineralization stage of the Jiujiang-Ruichang junction area reveals that the stress field of the junction structure at the major mineralization stage shows a relatively close relationship with the formation of the ore deposits (occurrences).展开更多
东雷湾矽卡岩型铜钼金多金属矿床位于九瑞矿集区西北部。本文利用锆石LA-MC-ICP MS U-Pb同位素定年方法,对东雷湾的主要岩体花岗闪长斑岩成岩时代进行研究,获得花岗闪长斑岩的锆石U-Pb年龄为(142.24±0.52)Ma;同时采用辉钼矿Re-Os...东雷湾矽卡岩型铜钼金多金属矿床位于九瑞矿集区西北部。本文利用锆石LA-MC-ICP MS U-Pb同位素定年方法,对东雷湾的主要岩体花岗闪长斑岩成岩时代进行研究,获得花岗闪长斑岩的锆石U-Pb年龄为(142.24±0.52)Ma;同时采用辉钼矿Re-Os同位素定年方法对矿床石英硫化物中的辉钼矿进行定年,首次获得东雷湾矿床的成矿年龄:6件辉钼矿的Re-Os同位素模式年龄范围为(144.8±3.1)^(147.1±2.4)Ma,加权平均年龄为(146.12±0.97)Ma,等时线年龄为(143.3±5.2)Ma。成岩年龄与成矿年龄在误差范围内一致,存在较短的成岩成矿时差,表明成岩成矿过程连续。辉钼矿的Re含量指示东雷湾矿床的成矿作用与岩浆壳幔混合作用有关。东雷湾矿区的成岩成矿时代与九瑞矿集区典型岩体和矿床的成岩成矿时代相似,同时也与长江中下游地区铜陵、安庆和鄂东南(部分地区)的典型铜多金属矿床的成岩成矿时代基本一致。结合区域地质资料,本文认为东雷湾矿床是中国东部东西向印支期构造域向北东向古太平洋构造域构造体制大转折晚期成矿作用的产物。展开更多
文摘The concept of fault junction is proposed to describe the relationship between the two faults by the authors. The junction relationship between Ganjiang and Tanlu faults is analyzed in this paper, and this has been elucidated through numerical simulation about the tectonic stress field analysis. Numerical simulation of the tectonic stress field conducted for the major mineralization stage of the Jiujiang-Ruichang junction area reveals that the stress field of the junction structure at the major mineralization stage shows a relatively close relationship with the formation of the ore deposits (occurrences).
文摘东雷湾矽卡岩型铜钼金多金属矿床位于九瑞矿集区西北部。本文利用锆石LA-MC-ICP MS U-Pb同位素定年方法,对东雷湾的主要岩体花岗闪长斑岩成岩时代进行研究,获得花岗闪长斑岩的锆石U-Pb年龄为(142.24±0.52)Ma;同时采用辉钼矿Re-Os同位素定年方法对矿床石英硫化物中的辉钼矿进行定年,首次获得东雷湾矿床的成矿年龄:6件辉钼矿的Re-Os同位素模式年龄范围为(144.8±3.1)^(147.1±2.4)Ma,加权平均年龄为(146.12±0.97)Ma,等时线年龄为(143.3±5.2)Ma。成岩年龄与成矿年龄在误差范围内一致,存在较短的成岩成矿时差,表明成岩成矿过程连续。辉钼矿的Re含量指示东雷湾矿床的成矿作用与岩浆壳幔混合作用有关。东雷湾矿区的成岩成矿时代与九瑞矿集区典型岩体和矿床的成岩成矿时代相似,同时也与长江中下游地区铜陵、安庆和鄂东南(部分地区)的典型铜多金属矿床的成岩成矿时代基本一致。结合区域地质资料,本文认为东雷湾矿床是中国东部东西向印支期构造域向北东向古太平洋构造域构造体制大转折晚期成矿作用的产物。
