钦杭成矿带南段云浮硫铁矿黄铁矿微组构特征及其对矿床成因的启示
发布时间：2019-05-30 01:15
【摘要】：云浮硫铁矿是位于钦杭结合带南段的超大型硫铁矿床,长期以来对其成因类型及成矿构造背景存在争议。基于矿床地质和岩相矿相学观察,应用最新的扫描电镜能谱技术(SEM-EDS)对其进行了细致研究。研究表明,云浮硫铁矿床黄铁矿矿石结构可分为条带状、浸染状、块状和脉状4种类型。手标本及镜下观察发现,条带状矿石存在揉皱构造,块状矿石中存在两种不同粒度的黄铁矿,黄铁矿细脉普遍存在于各种矿石中。扫描电镜观察和能谱分析显示,条带状矿石中黄铁矿主要呈立方体自形晶,立方体表面生长层发育平整,边缘平直,晶体按照多个层位同时堆积的方式生长,方铅矿等伴生矿物晶形也较好;浸染状矿石中黄铁矿粒度要大于条带状矿石中黄铁矿,但生长层不如后者平整;块状矿石中黄铁矿紧密接触,黄铁矿表面呈贝壳状断口,晶体边缘较难分辨,但样品表面也常见到近八面体晶形的晶体;脉状矿石中黄铁矿粒度较大,伴生有方铅矿等金属矿物,但由于生长空间的限制,晶形为半自形-他形。认为云浮硫铁矿具有2期叠加成矿的特点,为改造加富的热水喷流沉积矿床。喷流沉积阶段形成条带状和浸染状黄铁矿,其成矿温度较低,成矿环境相对平静。后期热液叠加富集阶段形成块状和脉状黄铁矿,其成矿温度较高。
[Abstract]:Yunfu pyrite is a very large pyrite deposit located in the southern section of Qinghang joint belt. Its genetic type and metallogenic tectonic background have been controversial for a long time. Based on the geological and petrographic observation of the deposit, the latest scanning electron microscope energy dispersive spectroscopy (SEM-EDS) was used to study it in detail. The results show that the pyrite ore structure of Yunfu pyrite deposit can be divided into four types: banded, disseminated, massive and vein. The hand specimens and microscopic observation show that the banded ore has wrinkle structure, there are two kinds of pyrite with different grain size in the massive ore, and the pyrite veinlets generally exist in all kinds of ores. Scanning electron microscope observation and energy spectrum analysis show that pyrite in banded ore is mainly cubic self-shaped crystal, the growth layer on the surface of cube is flat and the edge is straight, and the crystal grows in the way of multiple layers stacking at the same time. The crystal form of associated minerals such as galena is also good. The grain size of pyrite in disseminated ore is larger than that in banded ore, but the growth layer is not as smooth as the latter. Pyrite is in close contact in massive ores, and the surface of pyrite is shell-like, and the edge of the crystal is difficult to distinguish, but near octahedral crystals are often seen on the surface of the sample. Pyrite in vein ores has a large particle size and is associated with galena and other metal minerals, but due to the limitation of growth space, the crystal form is semi-self-shaped. It is considered that Yunfu pyrite has the characteristics of two stages superimposed mineralization, which is the transformation and enrichment of hot water jet sedimentary deposit. In the jet deposition stage, banded and disseminated pyrite are formed, the metallogenic temperature is low and the metallogenic environment is relatively calm. In the later stage of hydrothermal superposition and enrichment, massive and vein pyrite were formed, and their metallogenic temperature was high.
【作者单位】： 中山大学地球科学与地质工程学院∥广东省地质过程与矿产资源探查重点实验室;
【基金】：科技部国家重点研发计划项目(2016YFC0600408) 广东省自然科学基金(2016A030310210) 国家自然科学基金(41502068,41402165) 广州市“珠江科技新星”计划项目(201710010027)
【分类号】：P618.31
本文编号：2488384
[Abstract]:Yunfu pyrite is a very large pyrite deposit located in the southern section of Qinghang joint belt. Its genetic type and metallogenic tectonic background have been controversial for a long time. Based on the geological and petrographic observation of the deposit, the latest scanning electron microscope energy dispersive spectroscopy (SEM-EDS) was used to study it in detail. The results show that the pyrite ore structure of Yunfu pyrite deposit can be divided into four types: banded, disseminated, massive and vein. The hand specimens and microscopic observation show that the banded ore has wrinkle structure, there are two kinds of pyrite with different grain size in the massive ore, and the pyrite veinlets generally exist in all kinds of ores. Scanning electron microscope observation and energy spectrum analysis show that pyrite in banded ore is mainly cubic self-shaped crystal, the growth layer on the surface of cube is flat and the edge is straight, and the crystal grows in the way of multiple layers stacking at the same time. The crystal form of associated minerals such as galena is also good. The grain size of pyrite in disseminated ore is larger than that in banded ore, but the growth layer is not as smooth as the latter. Pyrite is in close contact in massive ores, and the surface of pyrite is shell-like, and the edge of the crystal is difficult to distinguish, but near octahedral crystals are often seen on the surface of the sample. Pyrite in vein ores has a large particle size and is associated with galena and other metal minerals, but due to the limitation of growth space, the crystal form is semi-self-shaped. It is considered that Yunfu pyrite has the characteristics of two stages superimposed mineralization, which is the transformation and enrichment of hot water jet sedimentary deposit. In the jet deposition stage, banded and disseminated pyrite are formed, the metallogenic temperature is low and the metallogenic environment is relatively calm. In the later stage of hydrothermal superposition and enrichment, massive and vein pyrite were formed, and their metallogenic temperature was high.
【作者单位】： 中山大学地球科学与地质工程学院∥广东省地质过程与矿产资源探查重点实验室;
【基金】：科技部国家重点研发计划项目(2016YFC0600408) 广东省自然科学基金(2016A030310210) 国家自然科学基金(41502068,41402165) 广州市“珠江科技新星”计划项目(201710010027)
【分类号】：P618.31
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1 杨荣勇,陆现彩,康显桂,尹志强;广东云浮硫铁矿中硒碲赋存状态初步研究[J];矿物岩石地球化学通报;1997年S1期
，本文编号：2488384
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