牙克石地区早白垩世梅勒图组火山地质研究
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摘要
梅勒图组火山岩是大兴安岭中生代火山活动的主要产物之一,是确定大兴安岭地区白垩纪构造环境的重要岩石组合。本文以牙克石地区出露的梅勒图组火山岩为对象,重新厘定了该组火山岩的岩石组合类型,并结合火山岩岩相与火山机构特征,反演了火山岩形成的构造环境。结果表明,该组火山岩的岩石类型主要为安粗岩和橄榄玄武粗安岩,少量粗安质火山碎屑岩;其锆石U-Pb(LA-ICPMS)年龄为(114. 25±0. 5) Ma;火山岩相以溢流相为主,局部有爆发相和潜火山岩相;火山机构类型为裂隙式,晚期收缩为点式喷发,火山活动受控于海拉尔河北东向断裂,早期沿断裂发生溢流式火山作用,形成溢流相熔岩,随后收缩为点式喷发,形成了牙克石农场等处的坠落-溅落火山锥,晚期潜玄武粗安岩沿火山通道的充填,标志着火山活动的结束。火山岩形成于造山作用后期向伸展作用转化的构造环境,岩浆来源于壳幔边界,且幔源组分的贡献较大。
The Meiletu volcanic rock is one of the main products of the Mesozoic volcanic activities,and is an important rock association to determine the Cretaceous tectonic environment of the Daxing'anling area. On the basis of geological survey of the volcanic rocks of Meiletu Formation in the Yakeshi area,rock type of the Meiletu rock,characteristics of lithofacies,volcanic mechanism and the tectonic environment are systematically studied. Main lithology of the formation is latite and olivine basaltic trachyandesite,with minor pyroclastic rock. The volcanic facies is mainly overflow facies,with local eruptive facies and subvolcanic facies. The volcanic activity is controlled by the East-to-North trending Hailaer Fault. Large-scale overflow volcanic action along the fault occurred in the early stage,forming overflow lava. Then,the volcanic activity turned to be weakened and became point eruption to form fall-splash volcanic cone in the Yakeshi farm and other locations. In the end,the volcanic channel was filled with basaltic trachyandesite. The LA-ICP-MS zircon U-Pb age is( 114. 25±0. 5) Ma. This volcanic rock was formed in transition from the post-orogenic to extensional environment and the magma is derived from the crust-mantle boundary with large contribution of mantle components.
The Meiletu volcanic rock is one of the main products of the Mesozoic volcanic activities,and is an important rock association to determine the Cretaceous tectonic environment of the Daxing'anling area. On the basis of geological survey of the volcanic rocks of Meiletu Formation in the Yakeshi area,rock type of the Meiletu rock,characteristics of lithofacies,volcanic mechanism and the tectonic environment are systematically studied. Main lithology of the formation is latite and olivine basaltic trachyandesite,with minor pyroclastic rock. The volcanic facies is mainly overflow facies,with local eruptive facies and subvolcanic facies. The volcanic activity is controlled by the East-to-North trending Hailaer Fault. Large-scale overflow volcanic action along the fault occurred in the early stage,forming overflow lava. Then,the volcanic activity turned to be weakened and became point eruption to form fall-splash volcanic cone in the Yakeshi farm and other locations. In the end,the volcanic channel was filled with basaltic trachyandesite. The LA-ICP-MS zircon U-Pb age is( 114. 25±0. 5) Ma. This volcanic rock was formed in transition from the post-orogenic to extensional environment and the magma is derived from the crust-mantle boundary with large contribution of mantle components.
引文
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英基丰,周新华,张连昌,王非,张玉涛.2008.北大兴安岭晚中生代火山岩的年代学和地球化学研究及其构造意义.矿物岩石地球化学通报,27(Z1):66-67
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张炯飞,权恒,武广,祝洪臣.2000.东北地区中生代火山岩形成的构造环境.贵金属地质,9(1):33-38
张连昌,周新华,英基丰,王非,陈志广,张玉涛.2007.大兴安岭早白垩世玄武质火山岩地球化学与Sr-Nd-Pb-Hf同位素组成:应用于岩浆源区与构造环境讨论.矿物岩石地球化学通报,26(Z1):39-40
张兴洲,杨宝俊,吴福元,刘国兴.2006.中国兴蒙-吉黑地区岩石圈结构基本特征.中国地质,33(4):816-823
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Fan W M,Guo F,Wang Y J,Li G.2003.Late Mesozoic calc-alkaline volcanism of post-orogenic extension in the northern Da Hinggan Mountains,northeastern China.Journal of Volcanology and Geothermal Research,121(1-2):115-135
Gao S,Rudnick R L,Yuan H L,Liu X M,Liu Y S,Xu W L,Ling WL,Ayers J,Wang X C,Wang Q H.2004.Recycling lower continental crust in the North China craton.Nature,432(7019):892-897
Le Maitre R W,Bateman P,Dudek A.1989.A classification of igneous rocks and glossary of terms:Recommendations of the international union of geological sciences,subcommission on the systematics of igneous rocks.Oxford:Blackwell,193
Meng Q R,Wei H H,Qu Y Q,Ma S X.2011.Stratigraphic and sedimentary records of the rift to drift evolution of the northern North China craton at the Paleo-to Mesoproterozoic transition.Gondwana Research,20(1):205-218
Pearce J A.1982.Trace element characteristics of lavas from destructive plate boundaries.In:Thorpe R S(ed.).Andesites,Orogenic Andesites and Related Rocks.Chichester:Wiley,8:525-548
Rittmann A.1973.Stable mineral assemblages of igneous rocks:Amethod of calculation.New York:Springer,1-264
Robinson P T,Zhou M F,Hu X F,Reynolds P,Wenji B,Yang J S.1999.Geochemical constraints on the origin of the Hegenshan Ophiolite,Inner Mongolia,China.Journal of Asian Earth Sciences,17(4):423-442
Sun S S,Mc Donough W F.1989.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes.Geological Society,London,Special Publications,42(1):313-345
Wang F,Zhou X H,Zhang L C,Ying J F,Zhang Y T,Wu F Y,Zhu RX.2006.Late Mesozoic volcanism in the Great Xing'an Range(NEChina):timing and implications for the dynamic setting of NE Asia.Earth and Planetary Science Letters,251(1-2):179-198
Wu F Y,Jahn B M,Wilde S A,Lo C H,Yui T F,Lin Q,Ge W C,Sun D Y.2003.Highly fractionated I-type granites in NE China(II):isotopic geochemistry and implications for crustal growth in the Phanerozoic.Lithos,67(3-4):191-204
Wu F Y,Lin J Q,Wilde S A,Zhang X O,Yang J H.2005.Nature and significance of the Early Cretaceous giant igneous event in eastern China.Earth and Planetary Science Letters,233(1-2):103-119
Wu F Y,Sun D Y,Li H M,Jahn B M,Wilde S.2002.A-type granites in northeastern China:age and geochemical constraints on their petrogenesis.Chemical Geology,187(1-2):143-173
Zhang J H,Ge W C,Wu F Y,Wilde S A,Yang J H,Liu X M.2008.Large-scale Early Cretaceous volcanic events in the northern Great Xing'an Range,northeastern China.Lithos,102(1-2):138-157
白志达,王剑民,许桂玲,刘磊,徐德斌.2008.内蒙古察哈尔右翼后旗乌兰哈达第四纪火山群.岩石学报,24(11):2585-2594
黑龙江省地质矿产局.1997.黑龙江省岩石地层.武汉:中国地质大学出版社,1-298
金玲,杨伟红,杨德明,和钟铧,马瑞,王建国.2014.内蒙古科右中旗地区梅勒图组安山岩年代学特征及其地质意义.世界地质,33(1):48-58
荆国强,廉康,李磊.2017.北秦岭成矿带西段天水东部地区产铀岩体特征及其与铀矿化的关系.东华理工大学学报(自然科学版),40(4):334-341
李怀坤,耿建珍,郝爽,张永清,李惠民.2009.用激光烧蚀多接收器等离子体质谱仪(LA-MC-ICPMS)测定锆石U-Pb同位素年龄的研究.矿物学报,29(S1):600-601
李文国.1996.内蒙古自治区岩石地层.武汉:中国地质大学出版社
吕志成,郝立波,段国正,李殿超,连长云.2000.满洲里-额尔古纳地区中生代火山岩地球化学研究.矿物学报,20(4):406-414
孟凡超,刘嘉麒,崔岩,高金亮,刘祥,童英.2014.中国东北地区中生代构造体制的转变:来自火山岩时空分布与岩石组合的制约.岩石学报,30(12):3569-3586
孙德有,许文良,周燕.1994.大兴安岭中生代火山岩的形成机制.矿物岩石地球化学通报,13(3):162-164
孙书勤,张成江,赵松江.2007.大陆板内构造环境的微量元素判别.大地构造与成矿学,31(1):104-109
杨若昕,白志达,谭庆伟,吴之理,王妍.2012.内蒙锡林浩特鸽子山火山地质研究.岩石学报,28(4):1181-1188
英基丰,周新华,张连昌,王非,张玉涛.2008.北大兴安岭晚中生代火山岩的年代学和地球化学研究及其构造意义.矿物岩石地球化学通报,27(Z1):66-67
张吉衡.2009.大兴安岭中生代火山岩年代学及地球化学研究.博士学位论文.武汉:中国地质大学
张炯飞,权恒,武广,祝洪臣.2000.东北地区中生代火山岩形成的构造环境.贵金属地质,9(1):33-38
张连昌,周新华,英基丰,王非,陈志广,张玉涛.2007.大兴安岭早白垩世玄武质火山岩地球化学与Sr-Nd-Pb-Hf同位素组成:应用于岩浆源区与构造环境讨论.矿物岩石地球化学通报,26(Z1):39-40
张兴洲,杨宝俊,吴福元,刘国兴.2006.中国兴蒙-吉黑地区岩石圈结构基本特征.中国地质,33(4):816-823
张玉清.2012.内蒙古阿巴嘎旗的梅勒图组.地层学杂志,36(1):71-76
张玉涛,张连昌,周新华,侯泉林,许振强.2008.大兴安岭北段牙克石地区玄武质火山岩的元素、同位素地球化学特征及其地质意义.地质通报,27(1):112-120