四川冕宁基性岩墙的年代学、地球化学特征及其地质意义
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摘要
本文对四川冕宁地区的基性岩墙进行了年代学、岩石学和地球化学研究。主量元素特正和微量元素标准化图解显示,基性岩墙属于拉斑玄武岩系列,具有洋岛玄武岩(OIB)的特征,与峨眉山玄武岩为同源产物,存在密切的成因关系。微量元素示踪、Th/Hf-Ta/Hf判别图表明,冕宁基性岩墙具有地幔柱成因的特征,并遭受了轻微混染。基性岩墙锆石LA-ICP-MS测年结果表明,岩墙形成年龄为256.7±4.3Ma,表明岩墙是峨眉山大火成岩省大规模岩浆作用晚期的产物。年龄测定结果还暗示了岩墙在约244Ma遭遇了一次变质事件,可能是岩浆热——机械侵蚀作用,以及印支运动诱发岩浆作用再次活跃的结果。
Geochronology,petrology and geochemistry were performed systematically on basic dykes in Mianning,Sichuan province.On the basis of major and trace elements patterns,basic dykes belong to tholeiitic basalt serie in lithology and have OIB(Ocean island basalts) features,which were homologous with Emeishan basalts.Trace elements tracing and Th/Hf—Ta/Hf identification diagram show that basic dykes were derived from mantle plume with little contamination.The LA-ICP-MS U-Pb zircon data of basic dyke yields a concordant age, 256.7±4.3Ma,which may represents the rock mass crystallization time.It shows that the Mianning basic dykes were formed in the late period of Emeishan mantle plume magmatism.In addition,the dating implies that dykes experienced geological events occurred about 244Ma,which was caused by thermal erosion of magma and triggered by the Indosinian movement.
Geochronology,petrology and geochemistry were performed systematically on basic dykes in Mianning,Sichuan province.On the basis of major and trace elements patterns,basic dykes belong to tholeiitic basalt serie in lithology and have OIB(Ocean island basalts) features,which were homologous with Emeishan basalts.Trace elements tracing and Th/Hf—Ta/Hf identification diagram show that basic dykes were derived from mantle plume with little contamination.The LA-ICP-MS U-Pb zircon data of basic dyke yields a concordant age, 256.7±4.3Ma,which may represents the rock mass crystallization time.It shows that the Mianning basic dykes were formed in the late period of Emeishan mantle plume magmatism.In addition,the dating implies that dykes experienced geological events occurred about 244Ma,which was caused by thermal erosion of magma and triggered by the Indosinian movement.
引文
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He Bin,Xu Yigang,Huang xiaolong,Luo Zhenyu,Shi Yuruo,Yang Qijun,Yu Songyue.2007.Age and duration of the Emeishan flood volcanism,SW China:Geochemistry and SHRIMP zircon U-Pb dating of silicic ignimbrites,post-volcanic Xuanwei Formation and clay tuff at the Chaotian section.Earth and Planetary Science Letters,255(3 - 4):306-323.
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何斌,徐义刚,肖龙,王康明,沙绍礼.2003.峨眉山大火成岩省的形成机制及空间展布:来自沉积地层学的新证据.地质学报,77(2): 194-202.
何斌,徐义刚,王雅玫,罗震宇,王康明.2005.用沉积记录来估计峨眉山玄武岩喷发前的地壳抬升幅度.大地构造与成矿学,29(3): 316-320.
李宏博,张招崇,吕林素.2010.峨眉山大火成岩省基性岩墙群几何学研究及对地幔柱中心的指示意义岩石学报,26(10):3143- 3152.
李献华,祁昌实,刘颖,梁细荣,涂湘林,谢烈文,杨岳衡.2005.扬子块体西缘新元古代双峰式火山岩成因:Hf同位素和Fe/Mn新制约.科学通报,50(19):2155-2160.
骆文娟,张招崇,侯通,王萌.2011.攀西茨达复式岩体年代学和地球化学:对峨眉山地幔柱活动时间的约束.岩石学报,27(10):2947 -2962.
宋彪,张玉海,万渝生,简平.2002.锆石SHRIMP样品靶制作、年龄测定及有关现象讨论.地质论评,48(增刊):26-30.
宋谢炎,侯增谦,曹志敏,卢纪仁,汪云亮,张成江,李佑国.2001.峨眉山大火成岩省的岩石地球化学特征及时限.地质学报,75(4): 498-506.
孙书勤,汪云亮,张成江.2003.玄武岩类岩石大地构造环境的Th, Nb,Zr判别.地质论评,49(1):40-47.
徐义刚,钟孙霖.2001.峨眉山大火成岩省:地幔柱活动的证据及其熔融条件.地球化学,30(1):1-9.
汪云亮,张成江,修淑芝.2001.玄武岩类形成的大地构造环境的Th/ Hf-Ta/Hf图解判别.岩石学报,17(3):413-421.
王登红,李建康,王成辉,屈文俊,付小方,傅德明.2007.与峨眉地幔柱有关年代学研究的新进展及其意义.矿床地质.26(5):550- 556.
吴元保,郑永飞.2004.锆石成因矿物学研究及其对U-Pb年龄解释的制约.科学通报,49(16):199-203.
张成江,汪云亮,侯增谦.1999.峨眉山玄武岩系的Th、Ta、Hf特征及岩浆源区大地构造环境探讨.地质论评,45(增刊):858-860.
张招崇,王福生.2002.峨眉山大火成岩省中发现二叠纪苦橄质熔岩.地质论评,48(4):448.
张招崇,王福生,郝艳丽,Mahoney J J.2004.峨眉山大火成岩省中苦橄岩与其共生岩石的地球化学特征及其对源区的约束.地质学报,78(2):171-180.
张招崇,Mahoney J J,王福生,赵莉,艾羽,杨铁铮2006.峨眉山大火成岩省西部苦橄岩及其共生玄武岩的地球化学:地幔柱头部熔融的证据.岩石学报,22(6):1538-1552.
张招崇.2009.关于峨眉山大火成岩省一些重要问题的讨论.中国地质,36(3):634-646.
Ali J R,Thompson G M,Zhou Meifu,Song Xieyan.2005.Emeishan large igneous province,SW China.Lithos,79(3 -4):475 -489.
Andersen T.2002.Correction of common lead in U-Pb analyses that do not report ~(204)Pb.Chemical Geology,192(1 -2):59 -79.
Campbell I H,Griffiths R W.1990.Implications of mantle plume structure for the evolution of flood Basalts.Earth and Planetary Science Letters,99(1 -2):79 -93.
Campbell I H.2007.Testing the plume theory.Chemical Geology,241(3 -4):153 -176.
Chung Sunlin,Jahn B M.1995.Plume—lithosphere interaction in generation of the Emeishan flood basalts at the Permian—Trassic boundary.Geology,23(10):889 -892.
Ernst R E,Buehan K L.1997.Giant radiating dyke swarms:Their use in identifying pre-Mesozoic large igneous provinces and mantle plumes. In:Mahoney J J,Coffin M F.eds.Large Igneous Provinces: Continental,Oceanic,and Planetary Flood Volcanism.USA: American Geophysical Union,297 -333.
Ernst R E,Buchan K L.2001.The use of mafic dike swarms in identifying and locating mantle plumes.In:Ernst R E,Buchan K L. eds.Mantle Plumes:Their Identification through Time.USA: Geological Society of America,Inc.,247 -265.
Guo Feng,Fan Weiming,Wang Yuejun,Li Chaowen.2004.When did the Emeishan mantle plume activity start? Geochronological and geochemical evidence from ultramafic—mafic dikes in southwestern China.International Geology Review,46(3):226 -234.
He Bin,Xu Yigang,Huang xiaolong,Luo Zhenyu,Shi Yuruo,Yang Qijun,Yu Songyue.2007.Age and duration of the Emeishan flood volcanism,SW China:Geochemistry and SHRIMP zircon U-Pb dating of silicic ignimbrites,post-volcanic Xuanwei Formation and clay tuff at the Chaotian section.Earth and Planetary Science Letters,255(3 - 4):306-323.
Hoskin P W O,Black L P.2000.Metamorphic zircon formation by solidstate recry stall ization of protolith igneous zircon.Journal of Metamorphic Geology,18(4):423 -439.
Irvine T N,Baragar W R A.1971.A guide to the chemical classification of the common volcanic rocks.Canadian Journal of Earth Sciences,8 (5):523 -548.
Lassiter J C,Depaolo D J.1997.Plume/lithosphere interaction in the generation of continental and oceanic flood basalts:Chemical and isotope constraints.In:Mahoney J.eds.Large Igneous Provinces: Continental,Oceanic and Planetary Flood Volcanism.USA: American Geophysical Union:Geophysical Monography,100,335 - 355.
LeCheminant A N,Heaman L M.1989.Mackenzie igneous events, Canada:Middle Proterozoic hotspot magmatism associated with ocean opening.Earth Planet,96(1 -2):38 -48.
Lepvrier V,Maluski H,Tich V,Leyreloup A,Thi P T,Vuong N V. 2004.The early Triassic Indosinian orogeny in Vietnam(Truong Son Belt and Kontum Massif):Implications for the geodynamic evolution of Indochina.Tectonophysics,393(1 -4):87 - 118.
Li Jie,Xu Jifeng,Suzuki K,He Bin,Xu Yigang,Ren Zhongyuan.2010. Os,Nd and Sr isotope and trace element geochemistry of the Muli picrites:Insights into the mantle source of the Emeishan Large Igneous Province.Lithos,119(1-2):108-122.
Liu Chengying,Zhu Rixiang.2009.Geodynamic significances of the Emeishan basalts.Earth Science Frontiers,16(2):52 -69.
McCulloch M T,Gamble J A.1989.Depleted source for volcanic arc basalts:Constraints from basalts of Kemadee—Taupo volcanic zone based on trace elements,isotopes and subduction chemical geodynamics.In:New Mexico Bureau of Mines and Mineral Resources,eds.Bulletin- New Mexico Bureau of Geology & Mineral Resources.USA:New Mexico Bureau of Mines and Mineral Resources,Socorro,NM,131,180.
McKenzie D P,O'Nions R K.1991.Partial melt distribution of melt generated by rare earth element concentrations.Journal of Petrology, 21:1021 -1091.
Miyashiro A.1974.Volcanic rock series in island arc and active continental margins.American Journal of Science,274(4):321 - 355.
Nam T N,Sano Y,Terada K,Toriumi M,Quynh P V,Dunge L T.2001. First SHRIMP U-Pb zircon dating of granulites from the Kontum massif (Vietnam) and tectonothermal implications.Journal of Asian Earth Sciences,19(1 -2):77 -84.
Shelinutt J G,Zhou Meifu,Yan Danping,Wang Yanbin.2008.Longevity of the Permian Emeishan mantle plume(SW China):1Ma,8Ma or 18Ma? Geological Magazine,145(3):373 -388.
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