云南龙陵勐糯铅锌矿区成矿作用和成矿期次研究
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摘要
本文在总结前人资料和大量野外地质调查工作基础上,运用光薄片鉴定、矿石结构构造及总体混合筛分结果,对勐糯铅锌矿矿区成矿作用进行了分析。认为区内矿床除受构造控制外,还明显受层位控制,矿体在含矿层位呈雁列脉状分布,一般矿床内表现为多层见矿一层为主的特点,且矿体在走向和倾向上尖灭再现现象明显。野外地质现象观察结果、室内光薄片鉴定成果和铅锌品位总体混合筛分实验结果显示,勐糯铅锌矿矿床的成矿期次划分为喷流沉积期,构造热液成矿期且热液期又可分为不同的两个成矿阶段,石英、重晶石硫化物成矿阶段和石英、碳酸盐成矿阶段。
In this paper, the metallogenic relationship of the Mengnuo lead-zinc deposit is analyzed on the basis of the previous geological data, field geological investigation, polished thin section identification, ore structure,ore texture and the overall mixed screening resoult. It is suggested that in addition to tectonic control, the ore deposit are obviously controlled by the layers, and the ore bodies are distributed in the ore bearing strata. The enrichment and mineralization of lead elements in the deposit have gone through two different stages. The first stage is the main enrichment and mineralization stage, forming the main lead-bearing stratiform and stratiformlike orebodies with wide distribution. In the second stage, the lead mineralization turned weaker, only partial ore bodies was thickened, forming fine vein and impregnated lead ores. The metallogenic period of the Mengnuo lead-zinc deposit can be divided into the jet sedimentary period and the tectonic hydrothermal mineralization period. And the latter can be divided into two different metallogenic stages, the quartz-barite-sulfide mineralization stage and quartz-carbonate mineralization stage.
In this paper, the metallogenic relationship of the Mengnuo lead-zinc deposit is analyzed on the basis of the previous geological data, field geological investigation, polished thin section identification, ore structure,ore texture and the overall mixed screening resoult. It is suggested that in addition to tectonic control, the ore deposit are obviously controlled by the layers, and the ore bodies are distributed in the ore bearing strata. The enrichment and mineralization of lead elements in the deposit have gone through two different stages. The first stage is the main enrichment and mineralization stage, forming the main lead-bearing stratiform and stratiformlike orebodies with wide distribution. In the second stage, the lead mineralization turned weaker, only partial ore bodies was thickened, forming fine vein and impregnated lead ores. The metallogenic period of the Mengnuo lead-zinc deposit can be divided into the jet sedimentary period and the tectonic hydrothermal mineralization period. And the latter can be divided into two different metallogenic stages, the quartz-barite-sulfide mineralization stage and quartz-carbonate mineralization stage.
引文
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[2]江彪,邓军,张长青.西南三江地区沉积岩容矿型铅锌矿成矿特征和成矿规律[J].Acta Geologica Sinica,2014,88(12):2532-2544.
[3]刘洪滔,莫向云,荣惠锋.保山成矿带铅锌矿地球化学特征及找矿方向[J].物探与化探,2013(5):787-793.
[4]朱华平,范文玉,高大发,等.西南三江成矿带中南段铅锌矿床成矿系列[J].沉积与特提斯地质,2008,28(4):62-68.
[5]李龚健.三江特提斯复合造山带构造演化与典型矿床成矿过程研究[D].中国地质大学(北京),2014.
[6]Dubois-Cote V,Hebert R,Dupuis C,et al.Petrological and geochemical evidence for the origin of the Yarlung Zangbo ophiolites,southern Tibet.Chem Geol[J].Chemical Geology,2005,214(3):265-286.
[7]毛晓长.保山-镇康地块及邻区早古生代地质特征及特提斯构造演化[D].中国地质大学(北京),2016.
[8]Deng J,Wang Q,Li G,Li C and Wang C.,Tethys tectonic evolution and its b earing on the distribution of important mineral deposits in the Sanjiang region,SW China[J].Gondwana Research,2014,26:419-437.
[9]Fan C,Zhang Y.The structure and tectonics of western Yunnan[J].Journal of Asian Earth Sciences,1994,9(4):355-361.
[10]Wang X D,Ueno K,Mizuno Y,et al.Late Paleozoic faunal,climatic,and geographic changes in the Baoshan block as a Gondwana-derived continental fragment in southwest China[J].Palaeogeography Palaeoclimatology Palaeoecology,2001,170(3):197-218.
[11]王琳,彭润民,韩雪峰,等.概率图解法软件研制及其在东升庙矿床研究中的应用[J].地质与勘探,2008,44(1):89-93.
[12]崔彬,赵磊,詹朝阳,等.硫同位素混合总体筛分[J].地球学报,2003,24(6):494-496.
[13]侯景儒,郭光裕.矿床统计预测及地质统计学的理论与应用[M].北京:冶金工业出版社,1993.
[14]郭光裕,郭万超.峪耳崖金矿金品位统计分布特征及其地质意义[J].地质找矿论丛,2000,15(2):142-150.