摘要
在"鞍本地区沉积变质型铁矿控矿条件及找矿模型研究"工作中,尝试在GIS平台上对鞍本地区进行区域地质、航磁、重力、化探、地热泉等资料进行综合分析,发现该区存在一条近EW向展布的航磁和重力水平一阶导数负值异常带,该带南北两侧的地磁场、重力场和地球化学场具有明显的差异。研究成果显示,这条EW向断裂带具有控岩、控矿作用。该断裂自新太古代以来一直有活动迹象,新太古代时,可能是火山喷发的重要通道,已知大型或特大型沉积变质型(鞍山式)铁矿床均分布在断裂北侧长约90km、宽约20km的带状区域内;元古宙—古生代时,断裂带对沉积环境具有明显的制约,断裂带两侧的沉积环境不尽相同;中生代时,一系列中酸性侵入岩沿该断裂侵入(局部为隐伏岩体);新生代沿该断裂出露有一系列平行带状展布的地热泉。
The GIS-based analysis of regional geology, air magmatic and gravity and geochemical surveys and geothermal spring distribution of ＂project of ore-control conditions and ore-searching model of BIF iron ore in Anshan-Benxi area＂ shows that there is a EW first derivative negative anomaly belt. Magnetic, gravity and geochemical fields on the south and north sides of the belt are different. According to researches the belt controls the rock-forming and ore-forming processes. There are evidences that the belt has been being active since Neo-Proterozoic era. During Neo-Proterozoic era it may be the feed of volcanism. The volcanism-formed sedimentary-metamorphic Anshan-style iron ore is distributed along north side of the belt and the large and super-large Anshan style iron ore deposits are all located in an area 90 km long and 20 km wide. During Proterzoic-Palaeozoic era the belt divided the south and north sides into different sedimentary environment. During Mesozoic era a series of intermediate-acidic rock bodies were intruded along the belt and locally the intrusion is concealed. During Cenozoic era a series of geothermal springs were exposed along the belt.
出处
《地质找矿论丛》
CAS
CSCD
2014年第4期471-479,共9页
Contributions to Geology and Mineral Resources Research
基金
国土资源部公益性行业科研专项(编号:201111002-02)资助
关键词
鞍本地区
沉积变质型铁矿
深大断裂
地质特征
辽宁省
Anshan-Benxi area
BIF type of iron ore
huge and deep fracture
geological characteristics
Liaoning province
