大兴安岭绰源地区奥陶系多宝山组-苏呼河组解体及时代探讨
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摘要
大兴安岭绰源地区出露有呈零星分布的老变质岩系,前人对其归属存在一定的争议。文章通过对该套岩石进行的地层学、岩石学、岩石地球化学特征研究和锆石U-Pb测年,探讨了该套变质岩系的原岩性质、形成环境和区域变质作用。结果表明,原岩主要为一套中酸性凝灰岩、砂岩、粉砂岩、泥岩及其过渡类型的碎屑岩;推测其沉积环境为活动大陆边缘的浅海相或浅海-滨海相;该套地层定年为中下志留统。
The metamorphic rock sequence is exposed sporadically in the Chaoyuan area of Daxinganling Mountains and the formation time controversial.Based on stratigraphy,petrology,rock geochemistry and U-Pb dating age is discussed the original rock property,formation environment and regional metamorphism.The result shows that the original rock is mainly a set of intermediate-acidic tuff,sandstone,siltstone,mudstone and their transitional types of clastic rock deposited under an active continent marginal shallow or shallow-neritic environment.Geological time of the sequence belongs to Middle-Early Silurian Period.
The metamorphic rock sequence is exposed sporadically in the Chaoyuan area of Daxinganling Mountains and the formation time controversial.Based on stratigraphy,petrology,rock geochemistry and U-Pb dating age is discussed the original rock property,formation environment and regional metamorphism.The result shows that the original rock is mainly a set of intermediate-acidic tuff,sandstone,siltstone,mudstone and their transitional types of clastic rock deposited under an active continent marginal shallow or shallow-neritic environment.Geological time of the sequence belongs to Middle-Early Silurian Period.
引文
[1]内蒙古自治区地质矿产局.内蒙古自治区区域地质志[M].北京:地质出版社,1991.
[2]内蒙古自治区地质矿产局.内蒙古自治区岩石地层[M].武汉:中国地质大学出版社,2008.
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[6]表尚虎,李仰春,何晓华,等.黑龙江省塔河绿林林场一带兴华渡口群岩石地球化学特征[J].中国区域地质,1999,18(1):28-33.
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[8]王和平,张小海,张治林,等.大兴安岭兴跃地区金异常特征及成矿分析[J].西北地质,2013,46(3):129-139.
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[13]王成文,孙跃武,李宁,等.中国东北及邻区晚古生代地层分布规律的大地构造意义[J].中国科学D辑:地球科学,2009,39(10):1429-1437.
[14]Zhou J B,Wilde S A,Zhang X Z,et al.Early Paleozoic metamorphic rocks of the Erguna block in the Great Xing'an Range,NE China:Evidence for the timing of magmatic and metamorphic events and their tectonic implications[J].Tectonophysics,2011,499(1-4):105-117.
[15]刘永江,张兴洲,迟效国,等.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,2011,41(5):1304-1313.
[16]Wu F Y,Jahn B M,Wilde S,et al.Phanerozoic crustal growth:U-Pb and Sr-Nd isotopic evidence from the granites in northeastern China[J].Tectonophysics,2000,328(1):89-113.
[14]Wu Guang,Chen Yuchuan,Chen Yanjing,et al.Zircon UPb ages of the metamorphic supracrustal rocks of the Xinghuadukou Group and granitic complexes in the Argun massif of the northern Great Hinggan Range,NE China,and their tectonic implications[J].Journal of Asian Earth Sciences,2012,49(3):214-233.
[18]余吉远,李向民,马中平,等.南祁连化隆岩群LA-ICP-MS锆石U-Pb年龄及其地质意义[J].西北地质,2012,45(1):79-85.
[19]宋史刚,丁振举,姚书振,等.甘肃武山温泉辉钼矿Re-Os同位素定年及其成矿意义[J].西北地质,2008,41(1):67-73.
(1)黑龙江省地质调查研究总院.内蒙古1∶25万阿荣旗幅M51C004003区域地质调查报告[R].哈尔滨:黑龙江省地质调查研究总院,2005.
(2)辽宁省地质矿产调查院.内蒙古东部博克图地区矿产远景调查报告[R].沈阳:辽宁省地质矿产调查院,2013.
[2]内蒙古自治区地质矿产局.内蒙古自治区岩石地层[M].武汉:中国地质大学出版社,2008.
[3]黑龙江省地质矿产局.黑龙江省区域地质志[M].北京:地质出版社,1993.
[4]曲关生.黑龙江省岩石地层[M].武汉:中国地质大学出版社,2008.
[5]Sun S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[C]//Saunders A D,Norry M J(Eds).Magmatism in the Ocean Basins.Geological Society London.Special Publications,1989,42:313-345.
[6]表尚虎,李仰春,何晓华,等.黑龙江省塔河绿林林场一带兴华渡口群岩石地球化学特征[J].中国区域地质,1999,18(1):28-33.
[7]孙广瑞,李仰春,张昱.额尔古纳地块基底地质构造[J].地质与资源,2002,11(3):129-139.
[8]王和平,张小海,张治林,等.大兴安岭兴跃地区金异常特征及成矿分析[J].西北地质,2013,46(3):129-139.
[9]王仁明,贺高品,陈珍珍,等.变质岩原岩图解判别法[M].地质出版社,1987,11(3):4-15.
[10]苗来成,刘敦一,张福勤,等.大兴安岭韩家园子和新林地区兴华渡口群和扎兰屯群锆石SHRIMP U-Pb年龄[J].科学通报,2007,52(5):591-601.
[11]Wu F Y,Sun D Y,Ge W C,et al.Geochronology of the Phanerozoic granitoids in northeastern China[J].Journal of Asian Earth Sciences,2011,41:1-30.
[12]张兴洲,杨宝俊,吴福元,等.中国兴蒙—吉黑地区岩石圈结构基本特征[J].中国地质,2006,33(4):816-823.
[13]王成文,孙跃武,李宁,等.中国东北及邻区晚古生代地层分布规律的大地构造意义[J].中国科学D辑:地球科学,2009,39(10):1429-1437.
[14]Zhou J B,Wilde S A,Zhang X Z,et al.Early Paleozoic metamorphic rocks of the Erguna block in the Great Xing'an Range,NE China:Evidence for the timing of magmatic and metamorphic events and their tectonic implications[J].Tectonophysics,2011,499(1-4):105-117.
[15]刘永江,张兴洲,迟效国,等.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,2011,41(5):1304-1313.
[16]Wu F Y,Jahn B M,Wilde S,et al.Phanerozoic crustal growth:U-Pb and Sr-Nd isotopic evidence from the granites in northeastern China[J].Tectonophysics,2000,328(1):89-113.
[14]Wu Guang,Chen Yuchuan,Chen Yanjing,et al.Zircon UPb ages of the metamorphic supracrustal rocks of the Xinghuadukou Group and granitic complexes in the Argun massif of the northern Great Hinggan Range,NE China,and their tectonic implications[J].Journal of Asian Earth Sciences,2012,49(3):214-233.
[18]余吉远,李向民,马中平,等.南祁连化隆岩群LA-ICP-MS锆石U-Pb年龄及其地质意义[J].西北地质,2012,45(1):79-85.
[19]宋史刚,丁振举,姚书振,等.甘肃武山温泉辉钼矿Re-Os同位素定年及其成矿意义[J].西北地质,2008,41(1):67-73.
(1)黑龙江省地质调查研究总院.内蒙古1∶25万阿荣旗幅M51C004003区域地质调查报告[R].哈尔滨:黑龙江省地质调查研究总院,2005.
(2)辽宁省地质矿产调查院.内蒙古东部博克图地区矿产远景调查报告[R].沈阳:辽宁省地质矿产调查院,2013.