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| 大兴安岭西南缘控矿断裂的有限应变测量和分析———以阿尔山大山多金属矿地区为例 |
| Measurement and Analysis of Finite Strain in the Ore-controlling flaut in the Southwest Great Xing’an Ranges———An Example From Dashan Multimetal Ore Area in Aershan City. |
| 投稿时间：2015-09-19 修订日期：2016-01-03 |
| DOI： |
| 中文关键词: 有限应变测量 主构造期 矿床成因 成矿预测 多金属矿 大山地区 |
| 英文关键词:strain analysis principal tectonic stage metallogenic metallogenic prognosis multimetal ore Dashan Area |
| 基金项目:国土资源部内蒙古兴安盟阿尔山地区1∶5万区域矿产地质调查项目(项目编号：NMKD2006—08)部分研究成果. |
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| 中文摘要: |
| 大山主干控矿断裂在北东东段为右行剪切兼逆冲性质的韧性剪切带,在野外现场根据面状和线状组构要素直接确定主应变轴的方向，在室内据定向标本较易确定λ1（伸长轴）、λ2（中间轴）、λ3（缩短轴）极点的产状。利用λ1、λ2、λ3极点等密图可全方位反映该区内各个应变轴的方位发育特征，也间接反映该区σ1（最大主应力）、σ2（中间主应力）、σ3（最小主应力）的方位发育特征。对部分韧性剪切带来说，这种方法是简单可行的，对区域地调、矿调有推广的实际价值。通过本次三维应变测量，确定了大山地区主构造期（晚侏罗世）的应变主轴方位。区内多金属矿矿床成因除了矽卡岩型和隐爆角砾岩型还应增加韧性剪切带型。大山地区今后的找矿方向：在上奥陶统裸河组二段含矿地层内，大山主干剪切带的次级韧性剪切带是下一步寻找多金属矿的远景区段，次级韧性剪切带与近东西向张节理交汇处是重点找矿靶区。 |
| 英文摘要: |
| In Dashan Area, the primary Ore-controlling flaut in the northeast by east section is shear zone of right shear and thrust.In the field ,according to planar and linear fabric elementsdetermine the principal axis of strain direction directly. In the interior,according to oriented sample is very easy to determine the polar occurrence of λ1 ( outrigger shaft), λ2 ( layshaft) and λ3 ( shorten shaft). Using λ1、λ2、λ3 pole iso density map can all-round reflect the direction Development characteristics of each axis of strain in the area. And also reflect direction the Development characteristics of σ1 (the greatest princical stress)、σ2 (intermediate princical stress) and σ3 (the least princical stress) in the area indirectly. To the part of ductile shear belt ,this method is simple and feasible,and it also have spreadly practical value on the regional geological or mineral survey. According to the three-dimensional strain measurement, the direction of principal axis of strain which is considered the primary tectonic movement (late Jurassic epoch) has been determined. Prospecting direction in Dashan Area :Ore formation in 2 length of luo he group of Upper Ordovician ,secondary ductile shear belt of trunk shear belt in Dashan Area is the next step promising area For prospecting multimetal ore.Joint of secondary ductile shear belt and nearly east-west expansion joint is the key exploration target. |
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