吕梁地区近周营组蚀变火山岩U-Pb-Hf同位素特征及其地质意义
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摘要
选择吕梁群中原岔上群北部地层的蚀变火山岩进行锆石U-Pb年代学和Hf同位素研究。锆石U-Pb测试获得两组年龄结果,较年轻的谐和年龄为1813±6 Ma (n=7),较老的207Pb/206Pb加权平均年龄为2516±31 Ma(n=2),前者为火山岩喷发时代,后者代表捕获锆石年龄。年轻锆石的εHf(t)值为-10.8～-2.3,TDM1值为2308～2655 Ma;捕获锆石的εHf(t)值为+10.0～+13.1。年龄约为2.5 Ga锆石的εHf(t)值高于亏损地幔演化线,考虑到UPb同位素和Hf同位素测点位置不完全相同,说明所获得的Hf同位素组成为无地质意义的混合数值;年龄约为1.8 Ga锆石的Hf同位素特征反映其可能源于富集地幔或受地壳物质混染的亏损地幔。结合前人的研究成果,推断岩浆作用事件发生在约1.81 Ga的碰撞后阶段。
Lüliang Group, as one of the lithostratigraphic units in the Lüliang Mountains, is composed of the original Lüliangshan Group and the low-grade metamorphic part of the original Chashang Group. This study chooses the altered volcanics belonging to the later Group in Lüliang Group to perform zircon U-Pb dating and Hf isotopic analysis in attempt to determine its formation time. The zircon U-Pb results show two groups of ages: one is the younger with concordant age of 1813±6 Ma(n=7) and the other is the older with 207 Pb/206 Pb weighted mean age of 2516±31 Ma(n=2). The former is likely to be interpreted as the crystallization age of the volcanic rock,whereas the latter is considered as the captured zircons. Magmatic zircons from the volcanic rock have εHf(t) values of-10.8--2.3, with TDM1 of 2308-2655 Ma, whereas captured zircons have εHf(t) values of +10.0-+13.1. The Hf isotopic signatures of ～2.5 Ga ages signify that their εHf(t) value is higher than the DMM line. U-Pb isotopic and Hf isotopic were analyzed in different domains of zircon, so the obtained Hf isotopic compositions are geologically meaningless mixtures. By contrast, the Hf isotopic signatures of ～1.8 Ga ages signify that their derivation from enriched mantle or depleted mantle contaminated by the crust. These results, together with previous data from the literatures, indicate that ～1.81 Ga magmatic event in the Lüliang area occurred at the post-orogenic setting.
Lüliang Group, as one of the lithostratigraphic units in the Lüliang Mountains, is composed of the original Lüliangshan Group and the low-grade metamorphic part of the original Chashang Group. This study chooses the altered volcanics belonging to the later Group in Lüliang Group to perform zircon U-Pb dating and Hf isotopic analysis in attempt to determine its formation time. The zircon U-Pb results show two groups of ages: one is the younger with concordant age of 1813±6 Ma(n=7) and the other is the older with 207 Pb/206 Pb weighted mean age of 2516±31 Ma(n=2). The former is likely to be interpreted as the crystallization age of the volcanic rock,whereas the latter is considered as the captured zircons. Magmatic zircons from the volcanic rock have εHf(t) values of-10.8--2.3, with TDM1 of 2308-2655 Ma, whereas captured zircons have εHf(t) values of +10.0-+13.1. The Hf isotopic signatures of ～2.5 Ga ages signify that their εHf(t) value is higher than the DMM line. U-Pb isotopic and Hf isotopic were analyzed in different domains of zircon, so the obtained Hf isotopic compositions are geologically meaningless mixtures. By contrast, the Hf isotopic signatures of ～1.8 Ga ages signify that their derivation from enriched mantle or depleted mantle contaminated by the crust. These results, together with previous data from the literatures, indicate that ～1.81 Ga magmatic event in the Lüliang area occurred at the post-orogenic setting.
引文
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[4]赵国春.华北克拉通基底主要构造单元变质作用演化及其若干问题讨论.岩石学报,2009,25(8):1772?1792
[5]Zhao G C,Cawood P,Lu L Z.Petrology and P-Thistory of the Wutai amphibolites:implications for tectonic evolution of the Wutai Complex,China.Precambrian Research,1999,93(2/3):181?199
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[8]Liu S W,Zhao G C,Wilde S A,et al.Th-U-Pb monazite geochronology of the Lüliang and Wutai Complexes:constraints on the tectonothermal evolution of the Trans-North China Orogen.Precambrian Research,2006,148(3/4):205?224
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[17]吴福元,杨进辉,柳小明,等.冀东3.8 Ga锆石Hf同位素特征与华北克拉通早期地壳时代.科学通报,2005,50(18):1996?2003
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[20]Zhai Mingguo.Secular changes of metallogenic systems link with continental evolving of the North China Craton.Acta Petrologica Sinica,2013,29(5):1759?1773
[21]Wang Huazhong,Mo Xinxin.An outline of the tectonic evolution of China.Episodes,1995,18(1/2):6?16
[22]Lu Songnian,Zhao Guochun,Wang Huichu,et al.Precambrian metamorphic basement and sedimentary cover of the North China Craton:a review.Precambrian Research,2008,160(1/2):77?93
[23]Zhao G C,Wilde S A,Sun M,et al.SHRIMP U-Pb zircon ages of granitoid rocks in the Lüliang Complex:implications for the accretion and evolution of the Trans-North China Orogen.Precambrian Research,2008,160(3):213?226
[24]万渝生,耿元生,沈其韩,等.孔兹岩系--山西吕梁地区界河口群的年代学和地球化学.岩石学报,2000,16(1):49?58
[25]Liu Shuwen,Zhang Jian,Li Qiugen,et al.Geochemistry and U-Pb zircon ages of metamorphic volcanic rocks of the Paleoproterozoic Lüliang Complex and constraints on the evolution of the Trans-North China Orogen,North China Craton.Precambrian Research,2012,222/223:173?190
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[27]Liu Chaohui,Liu Fulai,Zhao Guochun,et al.Provenance and tectonic setting of the Jiehekou Group in the Lüliang Complex:constraints from zircon U-Pb age and Hf isotopic studies.Acta Petrologica Sinica,2013,29(2):517?532
[28]Xia Xiaoping,Sun Min,Zhao Guochun,et al.U-Pb and Hf isotopic study of detrital zircons from the Lüliang khondalite,North China Craton,and their tectonic implications.Geological Magazine,2009,146(5):701?716
[29]Zhao Jiao,Gou Longlong,Zhang Chengli,et al.P-T-t path and tectonic significance of pelitic migmatites from the Lüliang Complex in Xiyupi area of TransNorth China Orogen,North China Craton.Precambrian Research,2017,303:573?589
[30]Trap P,Faure M,Lin W et al.The Luliang Massif:a key area for the understanding of the Palaeoproterozoic Trans-North China Belt,North China Craton.Geological Society London Special Publications,2009,323(1):99?125
[31]Liu Chaohui,Zhao Guochun,Sun Min,et al.U-Pb and Hf isotopic study of detrital zircons from the Yejishan Group of the Lüliang Complex:constraints on the timing of collision between the Eastern and Western Blocks,North China Craton.Sedimentary Geology,2011,236(1):129?140
[32]杜利林,杨崇辉,任留东,等.吕梁地区2.2~2.1 Ga岩浆事件及其构造意义.岩石学报,2012,28(9):2751?2769
[33]耿元生,万渝生,杨崇辉.吕梁地区古元古代的裂陷型火山作用及其地质意义.地球学报,2003,24(2):97?104
[34]Wang Z H,Wilde S A,Wan J L.Tectonic setting and significance of 2.3-2.1 Ga magmatic events in the Trans-North China Orogen:new constraints from the Yanmenguan mafic-ultramafic intrusion in the Hengshan-Wutai-Fuping area.Precambrian Research,2010,178(1):27?42
[35]胡育华,张成立,赵娇,等.山西吕梁地区岚河群沉积时代及形成环境:来自碎屑锆石U-Pb年龄和Hf同位素的证据.地质科学,2017,52(4):1195?1219
[36]Liu Chaohui,Liu Fulai,Zhao Guochun,et al.Geochronological and geochemical constraints on the Lüliang Group in the Lüliang Complex:implications for the tectonic evolution of the Trans-North China Orogen.Lithos,2014,198/199(5):298?315
[37]Wang Xi,Zhu Wenbin,Liu Yin,et al.Revisiting the Yejishan Group of the Lüliang Complex,North China:implications for a Paleoproterozoic active continental marginal basin in the Trans-North China Orogen.Precambrian Research,2017,292:93?114
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