排序方式： 共有4条查询结果，搜索用时 347 毫秒
1
1.
Rb-Sr isochron age of fluid inclusions in quartz from the Fuwan super-large silver deposit is 68 - 6 Ma, the silver deposit is characterized by high μ values (10.67 - 10.95 ), which are much higher than those of the ore-hosted Paleozoic strata and are close to those of ores hosted in the Proterozoic metamorphic basement in western Guangdong Province. Based on the Pb isotopic characteristics, coupled with much high background silver contents (200-1000ng/g) in the Proterozoic basement and relatively low silver contents in the Paleozoic strata in the region of the Sanshui Basin, it is concluded that the ore-forming material of the super-large silver deposit came mainly from the old basement. The super-large silver deposit related genetically to the intense volcanic activities during the Upper Cretaceous to Eogene. The formation of the Fuwan super-large silver deposit is controlled by the following favorable geological conditions : ( 1 ) The intersection of deep faults and contemporaneous faults at the margin of the Sanshui Basin led to the formation of an excellent structure as passageway for ore fluids; (2) The special ore-hosted rock association forms a ore gathering-trap structure that favors the precipitation of ore; (3) The silver-rich old basement, multi-stage mineralization and multi-episode volcanic activities which constitute a geothermal convection system. 相似文献
2.
Rb-Sr isochron age of fluid inclusions in quartz from the Fuwan super-large silver deposit is 68±6 Ma, the silver deposit is characterized by high μ values (10.67-10.95), which are much higher than those of the ore-hosted Paleozoic strata and are close to those of ores hosted in the Proterozoic metamorphic basement in western Guangdong Province. Based on the Pb isotopic characteristics, coupled with much high background silver contents (200-1000 ng/g) in the Proterozoic basement and relatively low silver contents in the Paleozoic strata in the region of the Sanshui Basin, it is concluded that the ore-forming material of the super-large silver deposit came mainly from the old basement. The super-large silver deposit related genetically to the intense volcanic activities during the Upper Cretaceous to Eogene. The formation of the Fuwan super-large silver deposit is controlled by the following favorable geological conditions: (1) The intersection of deep faults and contemporaneous faults at the margin of the Sanshui Basin led to the formation of an excellent structure as passageway for ore fluids; (2) The special ore-hosted rock association forms a ore gathering-trap structure that favors the precipitation of ore; (3) The silver-rich old basement, multi-stage mineralization and multi-episode volcanic activities which constitute a geothermal convection system. 相似文献
3.
广东富湾银矿床是国内银矿储量最大的矿床。为保障矿区的安全生产,降低金属矿开采诱发地震的风险,对矿区地震地质环境进行了系统调查研究。矿区位于丘陵地貌区,四周为三角洲冲积平原地貌所围绕。矿区处于由上三叠统小坪组地层构成的向斜之中,灰黑色薄层状含炭质泥岩、炭质页岩及煤层等软弱层发育。矿区内走向NNE-NE向和NWW向的断裂构造发育,钻孔揭示到的断裂物质组成以硅化岩、硅化角砾岩、胶结紧密的构造角砾岩等为主要特征,遥感卫星影像与地形地貌并没显示出断裂自晚第四纪以来有活动的迹象。在现今构造挤压应力场作用下,矿区范围走向NWW的断裂F6、F7容易发生走滑,而NE-NNE向的断裂F3、F4、F5则相对处于受挤压的状态。研究结果表明:矿区25 km范围地震活动性相对较弱。在日后矿山开采过程中,应注意断裂构造复活、矿体应力变化、软弱围岩或地质弱面等矿震诱发因素的影响。 相似文献
4.
Cenozoic Mineralization in China, as a Key to Past Mineralization and a Clue to Future Prospecting 总被引：2，自引：0，他引：2
WANG Denghong CHEN Yuchuan XU Jue YANG Jianmin XUE Chunji YAN Shenghao Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing Chinese Academy of Geological Sciences Beijing 《《地质学报》英文版》2000,74(3):478-484
Many Cenozoic metal deposits have been found during the past decade. Among them, the Fuwan Ag deposit in Guangdong is the largest Ag deposit in China. Besides, the largest Cu deposit of China in Yulong, Tibet, the largest Pb-Zn deposit of China in Jinding, Yunnan, and the largest Au deposit of China in Jinguashi,Taiwan, were also formed in the Cenozoic. Why so many important "present" deposits formed during such a short period of geological history is the key problem. The major reason is that different tectonic settings control different kinds of magmatic activity and mineralization at the same time. In southwestern China, porphyry-type Cu deposits such as Yulong were formed during the early stage of the Himalayan orogeny, sediment-hosted Pb-Zn deposits such as Jinding were formed within intermontane basins related to deep faults, and carbonatite-related deposits such as the Maoniuping REE deposit and alkalic magmatic rock-related deposits such as the Beiya Au deposit originated from the mantle source. 相似文献
1