發(fā)布時(shí)間：2019-05-30 01:15

【摘要】：云浮硫鐵礦是位于欽杭結(jié)合帶南段的超大型硫鐵礦床,長(zhǎng)期以來(lái)對(duì)其成因類型及成礦構(gòu)造背景存在爭(zhēng)議。基于礦床地質(zhì)和巖相礦相學(xué)觀察,應(yīng)用最新的掃描電鏡能譜技術(shù)(SEM-EDS)對(duì)其進(jìn)行了細(xì)致研究。研究表明,云浮硫鐵礦床黃鐵礦礦石結(jié)構(gòu)可分為條帶狀、浸染狀、塊狀和脈狀4種類型。手標(biāo)本及鏡下觀察發(fā)現(xiàn),條帶狀礦石存在揉皺構(gòu)造,塊狀礦石中存在兩種不同粒度的黃鐵礦,黃鐵礦細(xì)脈普遍存在于各種礦石中。掃描電鏡觀察和能譜分析顯示,條帶狀礦石中黃鐵礦主要呈立方體自形晶,立方體表面生長(zhǎng)層發(fā)育平整,邊緣平直,晶體按照多個(gè)層位同時(shí)堆積的方式生長(zhǎng),方鉛礦等伴生礦物晶形也較好;浸染狀礦石中黃鐵礦粒度要大于條帶狀礦石中黃鐵礦,但生長(zhǎng)層不如后者平整;塊狀礦石中黃鐵礦緊密接觸,黃鐵礦表面呈貝殼狀斷口,晶體邊緣較難分辨,但樣品表面也常見(jiàn)到近八面體晶形的晶體;脈狀礦石中黃鐵礦粒度較大,伴生有方鉛礦等金屬礦物,但由于生長(zhǎng)空間的限制,晶形為半自形-他形。認(rèn)為云浮硫鐵礦具有2期疊加成礦的特點(diǎn),為改造加富的熱水噴流沉積礦床。噴流沉積階段形成條帶狀和浸染狀黃鐵礦,其成礦溫度較低,成礦環(huán)境相對(duì)平靜。后期熱液疊加富集階段形成塊狀和脈狀黃鐵礦,其成礦溫度較高。
[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.
【作者單位】： 中山大學(xué)地球科學(xué)與地質(zhì)工程學(xué)院∥廣東省地質(zhì)過(guò)程與礦產(chǎn)資源探查重點(diǎn)實(shí)驗(yàn)室;
【基金】：科技部國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFC0600408) 廣東省自然科學(xué)基金(2016A030310210) 國(guó)家自然科學(xué)基金(41502068,41402165) 廣州市“珠江科技新星”計(jì)劃項(xiàng)目(201710010027)
【分類號(hào)】：P618.31

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1 楊榮勇,陸現(xiàn)彩,康顯桂,尹志強(qiáng);廣東云浮硫鐵礦中硒碲賦存狀態(tài)初步研究[J];礦物巖石地球化學(xué)通報(bào);1997年S1期

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