| 付海涛.鞍本地区EW向深大断裂地质特征[J].地质找矿论丛,2014,29(4):471-479 |
| 鞍本地区EW向深大断裂地质特征 |
| Geological characteristics of huge and deep EW fracture at Anshan-Benxi area |
| 投稿时间：2013-09-03 |
| DOI：10.6053/j.issn.1001-1412.2014.04.001 |
| 中文关键词: 鞍本地区 沉积变质型铁矿 深大断裂 地质特征 辽宁省 |
| 英文关键词:Anshan-Benxi area BIF type of iron ore huge and deep fracture geological characteristics Liaoning province |
| 基金项目:国土资源部公益性行业科研专项(编号:201111002-02)资助。 |
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| 中文摘要: |
| 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90 km、宽约20 km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。 |
| 英文摘要: |
| 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. |
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