陕西省松树沟铬铁矿床成因与成矿预测研究

发布时间：2018-03-25 23:13

本文选题：松树沟铬铁矿　切入点：阿尔卑斯型超镁铁岩体　出处：《长安大学》2015年硕士论文

【摘要】：松树沟岩体为秦岭造山带出露面积最大的超镁铁岩体,前人对该区进行了大量的勘查研究工作,在地表以下700m深度内投入了大量的坑道及钻探工程,并对控制的铬铁矿体进行了开采。很多学者对松树沟岩体成因进行了研究,存在蛇绿岩与阿尔卑斯型橄榄岩的不同认识。对于松树沟岩体的深部有没有找矿潜力?以及在什么部位找矿?这些问题都未解决。本论文选取松树沟岩体为研究对象,在前人地质找矿等研究成果总结的基础上,通过野外实地考察,岩石、矿物分析,岩体和矿体三维建模,对松树沟铬铁矿床成因、成矿模式、深边部找矿潜力及找矿方法进行了研究,主要成果如下:(1)松树沟铬铁矿为高铬型铬铁矿,赋存于松树沟超镁铁岩体中。岩体主要由纯橄榄岩和方辉橄榄岩组成,橄榄石为镁橄榄石,其Mg/(Mg+Fe+Mn)=0.89~0.94(平均为0.92)、Fo=91~94、NiO=0.21~0.38%(平均0.31%);斜方辉石为顽火辉石,其En=91~94,Al2O3=0.33%。综合研究认为:岩体属于阿尔卑斯型超镁铁岩体。(2)根据矿山343个钻孔数据(长度总计约10.8万米),应用3DMine软件建立了矿区三维模型,为深边部成矿预测提供了可视化素材,并计算了松树沟矿床地表以下700m深度的铬铁矿贫矿石量约616.91万吨(铬铁矿品位3%,含已知矿体)。(3)系统收集总结松树沟铬铁矿床地质、物探、化探资料,结合矿区三维建模及铬铁矿成矿理论,提出三个成矿预测区及一个成矿远景区,分别为界岭沟—干沟成矿预测区、干沟—小松树沟段深部成矿预测区、洋淇沟—东沟段(岩体下盘)成矿预测区和矿区外围泥鳅凹成矿远景区,并提出了找矿标志与找矿方法。
[Abstract]:The Songshugou rock body is the ultramafic rock body with the largest exposed area in the Qinling orogenic belt. The predecessor has done a lot of exploration and research work in this area, and has invested a large number of tunnel and drilling projects in the depth of 700m below the surface of the earth's surface. Many scholars have studied the genesis of Songshugou rock body and there are different understandings between ophiolite and Alpine peridotite. And at what point? These problems have not been solved. In this paper, Songshugou rock mass is selected as the research object, based on the summary of previous geological prospecting and other research results, through field investigation, rock, mineral analysis, rock mass and orebody three-dimensional modeling, The genesis, metallogenic model, prospecting potential and prospecting methods of the Songshugou chromite deposit are studied. The main results are as follows: 1) the Songshugou chromite is a chromite of high chromium type. Occurring in the Songshugou ultramafic rock body. The body is mainly composed of pure peridotite and calcareite, olivine is mafic olivine, and its Mg/(Mg Fe MNO _ (0.89) O _ (0.94) (mean 0.92F _ (92) F _ (91)) NiO _ (0.21) O _ (0.38) (mean 0.31) peridotite is enstatite, and the clinopyroxene is an enstatite. It is considered that the rock mass belongs to the Alpine type ultramafic rock mass. Based on the data of 343 boreholes (total length of about 108000 meters), the 3D model of the mining area is established by using 3DMine software, which provides visual material for the deep side metallogenic prediction. The authors have also calculated that the amount of chromite lean ore at a depth of 700m below the surface of the Songshugou deposit is about 6.1691 million tons (chromite grade 3, including known ore bodies). The geological, geophysical and geochemical data of the Songshugou chromite deposit are summarized. In combination with 3D modeling and chromite metallogenic theory, three metallogenic prediction areas and one metallogenic prospect area are proposed, which are respectively Jieling Gou-Ganguo metallogenic prediction area and deep ore-forming prediction area of Gangou-Xiaosongshugou section. The ore-forming prediction area of Yangqou-Donggou section (rock body footwall) and the Loach depression in the periphery of mining area are discussed, and the prospecting marks and prospecting methods are put forward.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.3

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