山东沂南金矿金场矿区断裂构造特征与古应力场恢复
|
摘要
为深入研究沂南金矿金场矿区构造特征及动力学机制,恢复该区域的古构造应力场,为矿区深部找矿及工程布设提供依据,对金场矿区马旺矿段及冶官墓矿段进行了详细的地质调查,运用赤平投影方法,恢复了矿区不同地质历史时期的构造主应力优选方位,并结合区域地质背景资料,对矿区构造特征、古构造应力场的演化系列进行了综合分析。研究表明:①矿区自中生代成矿以来至少经历了3期挤压变形,分别为白垩纪早期的近SN向挤压变形,白垩纪晚期的近EW向挤压变形及新近纪的近NE—SW向挤压变形,3期挤压应力逐渐减小,最终形成了矿区大量集中于NW、NE、NNE 3个延伸方位的剪节理或断层以及断层交汇形成的"入"字形与"人"字形的断裂构造格架;②赋存于断层带间的矿体在经历多期应力挤压变形后,其围岩稳定性较差,对后期巷道支护布设及采场设计参数优化提出了较高要求。
In order to fully study the structural characteristics and dynamic mechanism in Jinchang mining area of Yinan Gold Mine,restore the paleo-stress field in the area and provide basis for deep prospecting and engineering layout in the mining area,detailed geological survey of the Mawang ore section and Yeguanmu ore section of the mining area are carried out.By using the stereographic projection method,the optimum direction of tectonic principal stress in different geological history periods of the mining area is restored,and combined with the regional geological background data,the structural characteristics and evolution series of paleo-stress field of the mining area are analyzed synthetically.The study results show that:①the mining area has experienced at least three stages of extrusion deformation since the Mesozoic metallogenesis,that is,the near SN direction extrusion deformation in the Early Cretaceous,the near EW direction extrusion deformation in the Late Cretaceous and the near NE-SW direction extrusion in the Neogene,the three-stage extrusion stress is gradually reduced,finally,a large number of shear joints or faults in the extensions of NW,NE and NNE and a minefield fault framework formed by the intersectional faults in the mining area are formed;②stability of the surrounding rock of the orebodies hosed in the fault zones is poor after undergoing multi-stage stress extrusion deformation,therefore,the higher requirements for the layout of the roadway support and optimization of the design parameters in the stope are provided.
In order to fully study the structural characteristics and dynamic mechanism in Jinchang mining area of Yinan Gold Mine,restore the paleo-stress field in the area and provide basis for deep prospecting and engineering layout in the mining area,detailed geological survey of the Mawang ore section and Yeguanmu ore section of the mining area are carried out.By using the stereographic projection method,the optimum direction of tectonic principal stress in different geological history periods of the mining area is restored,and combined with the regional geological background data,the structural characteristics and evolution series of paleo-stress field of the mining area are analyzed synthetically.The study results show that:①the mining area has experienced at least three stages of extrusion deformation since the Mesozoic metallogenesis,that is,the near SN direction extrusion deformation in the Early Cretaceous,the near EW direction extrusion deformation in the Late Cretaceous and the near NE-SW direction extrusion in the Neogene,the three-stage extrusion stress is gradually reduced,finally,a large number of shear joints or faults in the extensions of NW,NE and NNE and a minefield fault framework formed by the intersectional faults in the mining area are formed;②stability of the surrounding rock of the orebodies hosed in the fault zones is poor after undergoing multi-stage stress extrusion deformation,therefore,the higher requirements for the layout of the roadway support and optimization of the design parameters in the stope are provided.
引文
[1]李瑞红,安平,恽孟河,等.焦家断裂带三维结构模型及其数值模拟:以新城金矿床控矿构造为例[J].大地构造与成矿学,2019,43(1):33-45.Li Ruihong,An Ping,Yun Menghe,et al.3D ore-controlling structural model and numerical simulation of Jiaojia fault zone:acase study of the Xincheng Gold Deposit[J].Geotectonica et Metallogenia,2019,43(1):33-45.
[2]田莉梅,张英,张景华.三山岛金矿上覆断层赋存状态对巷道稳定性的影响[J].金属矿山,2018(1):178-182.Tian Limei,Zhang Ying,Zhang Jinghua.Influence of the occurrence status of overburden fault on roadway stability in Sanshandao Gold Mine[J].Metal Mine,2018(1):178-182.
[3]蔡曙光.获各琦铜矿巷道支护及采场结构参数优化研究[D].赣州:江西理工大学,2015.Cai Shuguang.A Study on Roadway Supporting and Stope Structure Parameters Optimization of Huogeqi Copper Mine[D].Ganzhou:Jiangxi University of Science and Technology,2015.
[4]郭谱.鲁西中生代金成矿的地球动力学背景研究[D].北京:中国地质大学(北京),2014.Guo Pu.Geodynamic Setting of Mesozoic Gold Metallogeny in Western Shandong Province[D].Beijing:China University of Geosciences(Beijing),2014.
[5]钱建平,常德才,徐磊,等.山东沂南金矿田成矿构造系统和构造控矿规律[J].大地构造与成矿学,2017,41(1):77-90.Qian Jianping,Chang Decai,Xu Lei,et al.Metallogenictectonic system of Yinan Au-Cu Deposit,Shandong Province[J].Geotectonica et Metallogenia,2017,41(1):77-90.
[6]王炳文,徐鹏,张浩,等.九仗沟金矿采场岩体稳定性分析及参数优化[J].矿业科学学报,2018,3(6):561-567.Wang Bingwen,Xu Peng,Zhang Hao,et al.Stability analysis and parameter optimization on the rock mass in Jiuzhanggou Gold Mine[J].Journal of Mining Science and Technology,2018,3(6):561-567.
[7]万天丰.中国大地构造学:数据、图件与演化[M].北京:高等教育出版社,2011.Wan Tianfeng.The Tectonics of China:Data,Maps and Evolution[M].Beijing:High Education Press,2011.
[8]曹现志.华北地块中部中新生代构造地貌演变过程与机制[D].青岛:中国海洋大学,2014.Cao Xianzhi.Evolution and Mechanism of Tectonic Geomorphology in the Central North China Block from the Mesozoic to the Cenozoic[D].Qingdao:Ocean University of China,2014.
[9]雷小乔,周日平.鲁西南地区构造演化与煤变质规律[J].中国煤炭地质,2018,30(7):22-24.Lei Xiaoqiao,Zhou Riping.Tectonicevolution and coal metamorphism pattern in Southwestern Shandong[J].Coal Geology of China,2018,30(7):22-24.
[10]葛君,张泽坤,倪金龙,等.牟平-即墨断裂带南端断裂构造特征及动力学成因[J].现代地质,2015,29(4):747-754.Ge Jun,Zhang Zekun,Ni Jinlong,et al.Features and dynamic mechanism of the southern end of Muping-Jimofault[J].Geoscience,2015,29(4):747-754.
[11]刘卓岩.郯庐断裂带中段区域地应力特征及断层活动性分析[D].北京:中国地质大学(北京),2018.Liu Zhuoyan.The Regional Stress Characteristics and Fault Activity Analysis of the Mid-segment of Tanlu Fault Belt[D].Beijing:China University of Geosciences(Beijing),2018.
[12]向中林.基于GIS的沂南金矿成矿地质条件分析及成矿预测[D].北京:中国地质大学(北京),2008.Xiang Zhonglin.Analysis of Ore-forming Geological Conditions and Metallogenic Prediction of Yinan Gold Deposit Based on GIS[D].Beijing:China University of Geosciences(Beijing),2008.
[13]杨素俊.沂南金矿岩层地压活动规律及其控制方法研究[D].沈阳:东北大学,2011.Yang Sujun.The Research of Rock Ground Pressure Activity Regulation and Control Method in Yinan Gold Mine[D].Shenyang:Northeastern University,2011.
[14]祝德成,田瑞聪,田京祥,等.鲁西地区矽卡岩型铜金矿He-Ar同位素测定及其地质意义--以沂南地区铜井式铜金矿为例[J].山东国土资源,2018,34(8):1-5.Zhu Decheng,Tian Ruicong,Tian Jingxiang,et al.He-Arisotopic determination of skarntype copper gold depositsin Western Shandong and its geological significance:taking Tongjingtype copper gold deposits in Yinan Area as an example[J].Shandong Land and Resources,2018,34(8):1-5.
[15]朱日祥,徐义刚,朱光,等.华北克拉通破坏[J].中国科学:地球科学,2012,42(8):1135-1159.Zhu Rixiang,Xu Yigang,Zhu Guang,et al.Destruction of the North China Craton[J].Science China:Earth Science,2012,42(8):1135-1159.
[16]朱光,王薇,顾承串,等.郯庐断裂带晚中生代演化历史及其对华北克拉通破坏过程的指示[J].岩石学报,2016,32(4):935-949.Zhu Guang,Wang Wei,Gu Chengchuan,et al.Late Mesozoic evolution history of the Tanlufault zone and its indication to destruction processes of the North China Craton[J].Acta Petrologica Sinica,2016,32(4):935-949.
[17]刘美娟.沂沭断裂带新近纪活动特征分析[J].山东煤炭科技,2010(3):97-98.Liu Meijuan.Analysis of activity characteristic about Yishu faul[tJ].Shandong Coal Science and Technology,2010(3):97-98.
[2]田莉梅,张英,张景华.三山岛金矿上覆断层赋存状态对巷道稳定性的影响[J].金属矿山,2018(1):178-182.Tian Limei,Zhang Ying,Zhang Jinghua.Influence of the occurrence status of overburden fault on roadway stability in Sanshandao Gold Mine[J].Metal Mine,2018(1):178-182.
[3]蔡曙光.获各琦铜矿巷道支护及采场结构参数优化研究[D].赣州:江西理工大学,2015.Cai Shuguang.A Study on Roadway Supporting and Stope Structure Parameters Optimization of Huogeqi Copper Mine[D].Ganzhou:Jiangxi University of Science and Technology,2015.
[4]郭谱.鲁西中生代金成矿的地球动力学背景研究[D].北京:中国地质大学(北京),2014.Guo Pu.Geodynamic Setting of Mesozoic Gold Metallogeny in Western Shandong Province[D].Beijing:China University of Geosciences(Beijing),2014.
[5]钱建平,常德才,徐磊,等.山东沂南金矿田成矿构造系统和构造控矿规律[J].大地构造与成矿学,2017,41(1):77-90.Qian Jianping,Chang Decai,Xu Lei,et al.Metallogenictectonic system of Yinan Au-Cu Deposit,Shandong Province[J].Geotectonica et Metallogenia,2017,41(1):77-90.
[6]王炳文,徐鹏,张浩,等.九仗沟金矿采场岩体稳定性分析及参数优化[J].矿业科学学报,2018,3(6):561-567.Wang Bingwen,Xu Peng,Zhang Hao,et al.Stability analysis and parameter optimization on the rock mass in Jiuzhanggou Gold Mine[J].Journal of Mining Science and Technology,2018,3(6):561-567.
[7]万天丰.中国大地构造学:数据、图件与演化[M].北京:高等教育出版社,2011.Wan Tianfeng.The Tectonics of China:Data,Maps and Evolution[M].Beijing:High Education Press,2011.
[8]曹现志.华北地块中部中新生代构造地貌演变过程与机制[D].青岛:中国海洋大学,2014.Cao Xianzhi.Evolution and Mechanism of Tectonic Geomorphology in the Central North China Block from the Mesozoic to the Cenozoic[D].Qingdao:Ocean University of China,2014.
[9]雷小乔,周日平.鲁西南地区构造演化与煤变质规律[J].中国煤炭地质,2018,30(7):22-24.Lei Xiaoqiao,Zhou Riping.Tectonicevolution and coal metamorphism pattern in Southwestern Shandong[J].Coal Geology of China,2018,30(7):22-24.
[10]葛君,张泽坤,倪金龙,等.牟平-即墨断裂带南端断裂构造特征及动力学成因[J].现代地质,2015,29(4):747-754.Ge Jun,Zhang Zekun,Ni Jinlong,et al.Features and dynamic mechanism of the southern end of Muping-Jimofault[J].Geoscience,2015,29(4):747-754.
[11]刘卓岩.郯庐断裂带中段区域地应力特征及断层活动性分析[D].北京:中国地质大学(北京),2018.Liu Zhuoyan.The Regional Stress Characteristics and Fault Activity Analysis of the Mid-segment of Tanlu Fault Belt[D].Beijing:China University of Geosciences(Beijing),2018.
[12]向中林.基于GIS的沂南金矿成矿地质条件分析及成矿预测[D].北京:中国地质大学(北京),2008.Xiang Zhonglin.Analysis of Ore-forming Geological Conditions and Metallogenic Prediction of Yinan Gold Deposit Based on GIS[D].Beijing:China University of Geosciences(Beijing),2008.
[13]杨素俊.沂南金矿岩层地压活动规律及其控制方法研究[D].沈阳:东北大学,2011.Yang Sujun.The Research of Rock Ground Pressure Activity Regulation and Control Method in Yinan Gold Mine[D].Shenyang:Northeastern University,2011.
[14]祝德成,田瑞聪,田京祥,等.鲁西地区矽卡岩型铜金矿He-Ar同位素测定及其地质意义--以沂南地区铜井式铜金矿为例[J].山东国土资源,2018,34(8):1-5.Zhu Decheng,Tian Ruicong,Tian Jingxiang,et al.He-Arisotopic determination of skarntype copper gold depositsin Western Shandong and its geological significance:taking Tongjingtype copper gold deposits in Yinan Area as an example[J].Shandong Land and Resources,2018,34(8):1-5.
[15]朱日祥,徐义刚,朱光,等.华北克拉通破坏[J].中国科学:地球科学,2012,42(8):1135-1159.Zhu Rixiang,Xu Yigang,Zhu Guang,et al.Destruction of the North China Craton[J].Science China:Earth Science,2012,42(8):1135-1159.
[16]朱光,王薇,顾承串,等.郯庐断裂带晚中生代演化历史及其对华北克拉通破坏过程的指示[J].岩石学报,2016,32(4):935-949.Zhu Guang,Wang Wei,Gu Chengchuan,et al.Late Mesozoic evolution history of the Tanlufault zone and its indication to destruction processes of the North China Craton[J].Acta Petrologica Sinica,2016,32(4):935-949.
[17]刘美娟.沂沭断裂带新近纪活动特征分析[J].山东煤炭科技,2010(3):97-98.Liu Meijuan.Analysis of activity characteristic about Yishu faul[tJ].Shandong Coal Science and Technology,2010(3):97-98.