Essential natures of Carlin-type gold mineralization in the Zhenxun Basin

THE Zhen’ an-Xunyang (Zhen-Xun) Basin, located in the center of the Qinling Minor Plate in the Qinling orogen, develped and evoluted from the Devonian to the Triassic. The basin and its basement aresimilar to that of the southwestern part of the Yangtze Plate, where occur rich epithermal deposits. Thebasement of the basin is composed of the Proterozoic low-grade metamorphised volcanic and sedimentaryrocks, on which weakly metamorphised sedimentary and sedimentary rocks are deposited from the Cambrian to the Triassic. There occur three kinds of epithermal metal deposits: exhative-sedimentary-reformationtype Pb-Zn deposit (such as Xitonggou and Yuexi) ; reformation type Hg-Sb deposit (such as Dingjiashanand Shijiashan) ; sedimentary-reformation type Au deposit (such as Jinlongshan, Qiuling, Yaojie andJiashigou). The Au deposits are associated with minor Sb deposit. This contribution demonstrates onlythe essential natures of the epithermal gold mineralization.

镇旬盆地金矿成矿规律研究

文章总结了镇旬盆地金鸡岭复式向斜南北两带金矿的成矿条件、成矿规律、成矿模式、找矿标志,分析复式向斜南北两翼的成矿条件,认为运用北带的成矿规律、成矿模式、找矿标志可以指导在南带及其他地区微细浸染型金矿床的找矿工作。

镇旬盆地南西缘泥盆纪碳酸盐台缘生物礁与层控铅锌矿

沿镇旬盆地周缘分布着一系列的汞锑、铅锌、金等多金属矿产。近年来 ,在泥盆纪地层中发现的铅锌矿明显受碳酸盐台缘生物礁控制。文中确立了麻坪河生物礁相带和十里生物礁相带。同时运用盆地分析方法 ,对镇旬盆地的形态、性质及相带展布进行了初步分析 ,对碳酸盐台缘生物礁与铅锌矿的关系 ,铅锌矿控矿条件及找矿方向进行了探讨。

南秦岭镇旬盆地层序地层特征及盆地分析

地处板岩镇断裂与安康断裂之间的镇（安）旬（阳）盆地，泥盆系一中三叠统地层发育齐全，沉积构造及生物化石丰富，岩相较清晰，层序界面保存较完整，是南秦岭陆内造山带开展层序地层与盆地分析研究较为理想的地区。本文对镇旬盆地地层、层序特征进行总结，识别厘定了十一个层序不整合界面，划分了十个不整合界限地层单位，建立了盆地岩石地层格架、层序地层格架，并对盆地的形成、发展、演化进行了初步分析，探讨了沉积作用与矿产的相互关系。