嫩江地区中晚加里东期区域变质岩系构造背景
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摘要
按板块构造划分,嫩江地区位于兴蒙造山带东段兴安地块与松嫩地块交会部位,区内多期次的构造叠加作用强烈,是研究兴蒙造山带构造演化的关键地区之一。从研究区中晚加里东期区域变质岩系的区域地质背景着手,结合现有的区域地层和构造资料,对区内中晚加里东期区域变质岩系岩石学及地球化学特征、变质变形特征进行分析,通过野外地质产状和岩石共生组合的分析、变质作用及变质相的划分、构造环境判别等方法对区内中晚加里东期所经历的构造背景问题进行研究,认为研究区经历了弧后拉张→岛弧火山喷发沉积→弧后边缘海盆地伸展→弧后边缘盆地沉积的大地构造背景。区内中晚加里东期区域变质岩系的研究,对于重建嫩江地区加里东期构造背景具有重要意义。
In terms of plate tectonics,the research area is located at the intersection of Xing'an block and Songnen block in the eastern section of the Xing'an-Mongolian orogenic belt. Impacted with many periods of strong tectonic superposition,this is one of the key areas to study the tectonic evolution of this orogenic belt. The study of the regional metamorphic rocks in the middle and late Caledonian period is of great significance for restructuring tectonic setting of the Caledonian period in the study area. Starting from the regional geological background of the middle and late Caledonian regional metamorphic rocks in the study area,and based on the present regional strata and tectonic data, this paper studies their petrological, geochemical characteristics and metamorphic deformational characteristics. Through the analysis of field geological occurrence,rock paragenetic association,metamorphism,metamorphic facies division and tectonic environment discrimination,this paper studies the tectonic setting of the middle and late Caledonian period in the study region. It is believed that this region underwent post-arc extension-island-arc volcanic eruption deposition-back-arc marginal sea basin extension-back-arc marginal basin deposition.
In terms of plate tectonics,the research area is located at the intersection of Xing'an block and Songnen block in the eastern section of the Xing'an-Mongolian orogenic belt. Impacted with many periods of strong tectonic superposition,this is one of the key areas to study the tectonic evolution of this orogenic belt. The study of the regional metamorphic rocks in the middle and late Caledonian period is of great significance for restructuring tectonic setting of the Caledonian period in the study area. Starting from the regional geological background of the middle and late Caledonian regional metamorphic rocks in the study area,and based on the present regional strata and tectonic data, this paper studies their petrological, geochemical characteristics and metamorphic deformational characteristics. Through the analysis of field geological occurrence,rock paragenetic association,metamorphism,metamorphic facies division and tectonic environment discrimination,this paper studies the tectonic setting of the middle and late Caledonian period in the study region. It is believed that this region underwent post-arc extension-island-arc volcanic eruption deposition-back-arc marginal sea basin extension-back-arc marginal basin deposition.
引文
陈东旭,2016.黑龙江东部中-新生代构造演化与低温热年代学研究[D].杭州:浙江大学.
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高晓英,郑永飞,2011.金红石Zr和锆石Ti含量地质温度计[J].岩石学报,27(2):417-432.
和钟铧,刘招君,张晓冬,等,2009.黑龙江东部晚中生代盆地群构造层划分及构造沉积演化[J].世界地质,28(1):20-27.
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刘宾强,2016.大兴安岭北段嫩江-黑河构造带古生代演化研究[D].吉林:吉林大学.
刘正宏,潘博文,李鹏川,等,2017.内蒙古大青山高级变质岩韧性剪切带及其流变机制[J].地球科学,42(12):2105-2116.
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徐磊,姜锡,董茜,2016.江苏沛县田祖庙地区泰山(岩)群变质岩地球化学特征及原岩恢复[J].地质学刊,40(1):47-56.
杨继权,王秀琴,刘殿生,等,2007.黑龙江省大地构造单元划分及特征[J].世界地质,26(4):426-434,452.
张兴洲,杨宝俊,吴福元,等,2006.中国兴蒙-吉黑地区岩石圈结构基本特征[J].中国地质,33(4):816-823.
张允平,李景春,2010.华北及其以北地区晚古生代-早中生代构造格架主体特点[J].中国地质,37(4):916-930.
翟明国,2012.华北克拉通的形成以及早期板块构造[J].地质学报,86(9):1335-1349.
张聪,黄虎,侯明才,2017.地球化学方法在硅质岩成因与构造背景研究中的进展及问题[J].成都理工大学学报(自然科学版),44(3):293-304.
董申保,1990.变质作用中的地质温压计[J].矿物岩石地球化学通报,8(11):16-25.
董申保,田伟,2004.埃达克岩的原义、特征与成因[J].地学前缘,11(4):585-594.
高晓英,郑永飞,2011.金红石Zr和锆石Ti含量地质温度计[J].岩石学报,27(2):417-432.
和钟铧,刘招君,张晓冬,等,2009.黑龙江东部晚中生代盆地群构造层划分及构造沉积演化[J].世界地质,28(1):20-27.
黄薇,张顺,张晨晨,等,2013.松辽盆地嫩江组层序构型及其沉积演化[J].沉积学报,31(5):920-927.
简平,程裕淇,刘敦一,2001.变质锆石成因的岩相学研究:高级变质岩U-Pb年龄解释的基本依据[J].地学前缘,8(3):183-191.
孔凡梅,李旭平,李守军,等,2011.黑龙江杂岩带的形成演化及地质意义[J].地质论评,57(5):623-631.
刘永江,张兴洲,迟效国,等,2011.大兴安岭地区上古生界变形特征及构造层划分[J].吉林大学学报(地球科学版),57(5):1304-1313.
李宝民,2012.黑龙江省嫩江地区莫尔根河组火山岩的岩石学、地球化学特征及其构造背景[D].吉林:吉林大学.
刘宾强,2016.大兴安岭北段嫩江-黑河构造带古生代演化研究[D].吉林:吉林大学.
刘正宏,潘博文,李鹏川,等,2017.内蒙古大青山高级变质岩韧性剪切带及其流变机制[J].地球科学,42(12):2105-2116.
李耿,武现伟,邢博,等,2017.徐州西南部地质构造特征及成因[J].地质学刊,41(4):614-618
马永非,刘永江,温泉波,等,2017.大兴安岭中段晚三叠世哈达陶勒盖组火山岩成因及构造背景[J].地球科学,42(12):2146-2173.
彭玉鲸,赵成弼,2001.古吉黑造山带的演化与陆壳的增生[J].吉林地质,20(2):1-9.
潘桂棠,肖庆辉,陆松年,等,2009.中国大地构造单元划分[J].中国地质,36(1):1-28.
任纪舜,徐芹芹,邓平,等,2016.构造旋回与大地构造年表[J].地球学报,37(5):528-534.
徐磊,姜锡,董茜,2016.江苏沛县田祖庙地区泰山(岩)群变质岩地球化学特征及原岩恢复[J].地质学刊,40(1):47-56.
杨继权,王秀琴,刘殿生,等,2007.黑龙江省大地构造单元划分及特征[J].世界地质,26(4):426-434,452.
张兴洲,杨宝俊,吴福元,等,2006.中国兴蒙-吉黑地区岩石圈结构基本特征[J].中国地质,33(4):816-823.
张允平,李景春,2010.华北及其以北地区晚古生代-早中生代构造格架主体特点[J].中国地质,37(4):916-930.
翟明国,2012.华北克拉通的形成以及早期板块构造[J].地质学报,86(9):1335-1349.
张聪,黄虎,侯明才,2017.地球化学方法在硅质岩成因与构造背景研究中的进展及问题[J].成都理工大学学报(自然科学版),44(3):293-304.