摘要
为了研究那陵郭勒河东铁矿区磁异常源,对该区矿石进行了光谱半定量分析、多项化学分析、组合分析和铁矿物物相分析,对成矿起重要作用的早石炭世灰岩及大理岩、印支期二长花岗岩及黑云母钾长花岗岩、矽卡岩及含矿矽卡岩矿体的磁物性进行了对比分析,对磁异常进行了分析研究,并对矿区磁异常进行了二维反演。结果认为:1、矿石中Fe2O3含量高,大于20%,TFe含量高达35.86%以上,其中MFe28.17%-50.79%,平均35.37%,铁矿石多为原生矿石;2、磁铁矿石磁性强,远高于其它地层、岩体,因此,矿区矿体是引起磁异常的主要因素;3、矿区磁异常的形态、范围及磁异常梯度带与产于矽卡岩内矿体的分布极吻合,本次测制的剖面△T曲线及其二维反演结果也显示,矿区磁异常是由含矿矽卡岩引起的;4、矿区磁异常与磁铁矿体吻合性较好,具有开展磁法工作的良好地球物理前提,下一步深部找矿及外围找矿应安排在磁异常范围内进行。
In order to study the source of anomaly in iron ore deposit in East Na Ling Guo Le River of East Kunlun Mountains, ore in the area are carried on such measurement as semi-quantitative spectral analysis, chemical analysis, combinatorial analysis and phase analysis.
Contrastive analysis was conducted among the magnetism of early Carboniferous limestone and marble, Indo-Chinese epoch monzogranite and biotite granite, skarn and skarn ore,which are of importance in ore forming. Magnetic anomaly was analyzed and a two-dimensional inversion was conducted. It was concluded that: 1. FeO3 in ore is more than 20% ,TFe morethan 35.86%. the content of MFe is between 28.17% and 50.79% with a average of 35.37%. The Iron ore belongs to primary ore. 2. Magnetic of the magnetite ore is much more stronger than strata and intrusives and the ore body is the main cause of magmatic anomaly. 3. the shape,range and gradient belt of magnetic anomaly is fit close to the ore body in skarn. The result of △T curve and 2-Dimentional inversion also showed that the magnetic anomaly was caused by ore bearing skarn. 4. The magnetic anomaly fit well to the magnetite ore. There is great precondition in carting on magnetic measurement. Exploration in deep area and outside should be arranged in magnetic anomaly.
出处
《地质与勘探》
CAS
CSCD
北大核心
2009年第3期304-311,共8页
Geology and Exploration
基金
青藏高原地质矿产调查与评价专项地勘项目(项目编号:1212010818069)资助
关键词
东昆仑
那陵郭勒河东
铁矿
磁异常
二维反演
the mountain of East Kunlun East Na Ling Guo Le River iron ore magnetic anomalies