本溪地区鞍山式铁矿含铁建造显微构造变形机制
|
摘要
辽宁本溪地区为我国重要的鞍山式铁矿富集区,研究该地区含铁建造的显微构造变形机制,对系统研究区内含铁建造的沉积演化过程具有重要意义。研究表明,该处岩石经历了2期强烈韧性变形作用改造,依据重结晶作用类型和主要显微结构,变形作用发生在绿片岩岩相条件下。利用古差值应力大小测量,确定该地区含铁建造岩石变形古应力值为27.36～36.88 MPa;剪应变值在11.342～18.555 MPa之间,并具有左旋剪切性质。
The Benxi area of Liaoning Province is an important Anshan-type iron ore concentration area in China. The study of the microstructural deformation mechanism of iron-bearing formations in this area is of great significance to the systematic study of the sedimentary evolution of iron-bearing formations in this area. The microstructural study shows that the rock has undergone two stages of intense ductile deformation. According to the recrystallization type and main microstructures, the deformation occurred under greenschist facies conditions. Based on the paleo-difference stress measurement, the paleo-stress values of rock deformation of iron-bearing formations in this area are determined to be 27.36-36.88 MPa, and the shear strain values are 11.342-18.555 MPa, which have left-lateral shear properties.
The Benxi area of Liaoning Province is an important Anshan-type iron ore concentration area in China. The study of the microstructural deformation mechanism of iron-bearing formations in this area is of great significance to the systematic study of the sedimentary evolution of iron-bearing formations in this area. The microstructural study shows that the rock has undergone two stages of intense ductile deformation. According to the recrystallization type and main microstructures, the deformation occurred under greenschist facies conditions. Based on the paleo-difference stress measurement, the paleo-stress values of rock deformation of iron-bearing formations in this area are determined to be 27.36-36.88 MPa, and the shear strain values are 11.342-18.555 MPa, which have left-lateral shear properties.
引文
陈鹏,施炜,2014.古构造应力场反演的理论与实践:基于断层滑动矢量分析[J].地质论评,61(3):536-546.
管树巍,李本亮,何登发,等,2007.复杂构造解析中的几何学方法与应用[J].地质科学,42(4):722-739.
贾楠,刘池洋,张功,等,2015.辽东湾坳陷新生代构造改造作用及演化[J].地质科学,50(2):377-390.
刘颖,刘刚,2010.显微构造研究方法在韧性剪切带遥感分析中的应用[J].吉林大学学报(地球科学版),40(3):597-602.
李思伟,王璞珺,丁秀春,等,2014.辽河东部凹陷走滑构造及其与火山岩分布的关系[J].地质论评,60(3):591-600.
李洪奎,禚传源,耿科,等,2017.郯-庐断裂带陆内伸展构造:以沂沭断裂带的表现特征为例[J].地学前缘,25(2):73-84.
孙竟雄,张永康,1987.应用弗林图解解释宁镇构造问题的尝试[J].地质学刊(原《江苏地质》),11(2):7-13.
肖克炎,邹伟,李莹,等,2018.地质建模中的二维数据模型[J].地质学刊,42(3):351-360.
袁建国,严启平,王伟,等,2014.辽宁北票台吉营子金矿显微构造特征浅析[J].化工矿产地质,36(2):65-72.
赵文菊,许顺贵,周俊鹏,等,2017.南芬铁矿床地球化学特征及成矿构造环境浅析[J].西部探矿工程,29(10):171-174.
管树巍,李本亮,何登发,等,2007.复杂构造解析中的几何学方法与应用[J].地质科学,42(4):722-739.
贾楠,刘池洋,张功,等,2015.辽东湾坳陷新生代构造改造作用及演化[J].地质科学,50(2):377-390.
刘颖,刘刚,2010.显微构造研究方法在韧性剪切带遥感分析中的应用[J].吉林大学学报(地球科学版),40(3):597-602.
李思伟,王璞珺,丁秀春,等,2014.辽河东部凹陷走滑构造及其与火山岩分布的关系[J].地质论评,60(3):591-600.
李洪奎,禚传源,耿科,等,2017.郯-庐断裂带陆内伸展构造:以沂沭断裂带的表现特征为例[J].地学前缘,25(2):73-84.
孙竟雄,张永康,1987.应用弗林图解解释宁镇构造问题的尝试[J].地质学刊(原《江苏地质》),11(2):7-13.
肖克炎,邹伟,李莹,等,2018.地质建模中的二维数据模型[J].地质学刊,42(3):351-360.
袁建国,严启平,王伟,等,2014.辽宁北票台吉营子金矿显微构造特征浅析[J].化工矿产地质,36(2):65-72.
赵文菊,许顺贵,周俊鹏,等,2017.南芬铁矿床地球化学特征及成矿构造环境浅析[J].西部探矿工程,29(10):171-174.