| 刘德民,吕晓春,黄锦山,邵俊琦,李致伟,程炎勋.滇东北会泽地区南红玛瑙产出特征及成因分析[J].地质找矿论丛,2018,33(4):548-553 |
| 滇东北会泽地区南红玛瑙产出特征及成因分析 |
| Geological characteristics and genesis of Nanhong agate from Huize area of the Northeast Yunan Province |
| 投稿时间：2017-06-05 |
| DOI：10.6053/j.issn.1001-1412.2018.04.007 |
| 中文关键词: 南红玛瑙 产出特征 成因分析 会泽县 滇东北 |
| 英文关键词:Nanhong agate occurrence characteristic genetic analysis Huize county the northeast Yunan province |
| 基金项目:中国地质调查局项目（编码：12120115041601；编码：12120113072100）和武警黄金指挥部项目"云南会泽县待补地区小米落叠加褶皱专项"联合资助。 |
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| 中文摘要: |
| 会泽地区的南红玛瑙矿主要产于上三叠统飞仙关组的中上部砾岩层、上二叠统宣威组底部砾岩层以及晚二叠世峨眉山组杏仁状玄武岩中。玛瑙新鲜面多为红色、浅红色及灰白色；呈椭球状或扁球状分布于砾岩之中，分布不均匀，局部富集；玛瑙砾石大小不一，玛瑙粒径多集中在0.5~5 cm，偶见大于6 cm。会泽地区的南红玛瑙矿形成可分为三个阶段：1）晚二叠世时期，玄武质火山岩（P3e）中的含硅质热液在晚期充填于玄武岩气孔或裂隙中，经过（快速）冷却形成隐晶质石英或晶质石英集合体——玛瑙，即原生玛瑙；2）晚二叠世晚期的华力西运动和印支运动早期的地壳继续隆升，使得含玛瑙玄武岩遭受风化-剥蚀作用，两次剥离出来的玛瑙单体经流水搬运作用及河湖相沉积作用，形成宣威组（P3x）、飞仙关组（T1f）含玛瑙砾石层——沉积砾岩型玛瑙矿产；3）近-现代地质作用，使得二叠纪玄武岩气孔中原生玛瑙和宣威组、飞仙关组沉积砾岩层中的次生玛瑙砾石，再次受到风化-剥蚀作用，玛瑙砾石经流水搬运至现代河流或湖泊中，形成次生玛瑙砂矿。 |
| 英文摘要: |
| Agate is discovered at Nanhong, in top conglomerate of Early Triassic Feixiangua Formation and bottom conglomerate of Upper Permian Xuanwei Formation and amygdaloidal basalts of Late Permian Emeishan Formation. Different agate shows different colour, such as red, light red and gray at fresh cuts. The agate occurs as spheroidal or oblate spheroidal bodies in different sizes(0.5~5 cm) in the conglomerate and is unevenly distributed. Rarely occurs the size of 6cm. The agate was formed in three stages, i.e. 1)Late Permian Period during which in the basaltic volcanics (P3e)siliceous hydrothermal fluid filled in pores and cracks and quickly cooled and crypto quartz and crystalline quartz, the primary agate formed; 2)Late late Permian Period during which the crust continued to uplift at early Hercynian and Hindo-China movement and the agate-bearing rocks were exposed to weathering and erosion and the agate isolated and was transported by water then redeposited at river or lake as sedimentary agate in Xuanwei Formation (P3x)and Feixianguan Formation (T1f); 3)recent ant modern time during which the primary and sedimentary agates were exposed to weathering and erosion and agate conglomerate formed as placer. |
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