贵州梵净山地区新元古代拉伸纪岩浆演化时序
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摘要
为获得江南造山带西段梵净山地区新元古代拉伸纪的岩浆演化时序,为区域综合对比提供可靠的典型地区岩浆岩年代学研究基础资料,以及为梵净山申报地质公园提供详实的科普素材,对研究区新发现的辉绿岩体进行了年代学研究,获得该岩体U-Pb年龄为805.3±4.5Ma。通过对已有年龄数据的系统梳理与总结,认为梵净山群回香坪组内玄武岩的喷发结束时间为840Ma,存在831Ma、814～805Ma两次基性-超基性岩浆活动和855Ma、834Ma两次酸性岩浆活动。梵净山地区的新元古代拉伸纪岩浆活动时序可与黔东南—桂北地区对比。结合岩石类型及其地球化学特征,认为江南造山带西段拉伸纪早期岩浆岩的成因可能与扬子和华夏板块的俯冲碰撞有关,拉伸纪晚期岩浆岩的形成可能与华南大陆伸展裂陷有关。
In order to obtain the geochronologic sequence of the Neoproterozoic magmatism in Fanjingshan area of the western Jiangnan Orogen and to provide a reliable foundation of chronological study in the typical area for comprehensive comparison and for geopark declaration and science popularization, the paper reports the zircon U-Pb dating of a newly discovered diabase in Fanjingshan area. The result shows that the diabase was formed at 805.3 ± 4.5 Ma. The authors also sorted and summarized the existing age reports in a comprehensive and systematic way, and hold that the end of the eruption of basalts was 840 Ma. There were two periods of basic-ultrabasic magmatism(831 Ma, 814～805 Ma) and two periods of acid magmatism(855 Ma, 834 Ma) that occurred in Fanjingshan area during Neoproterozoic. The magmatic geochronology sequence of Fanjingshan area largely corresponds to that of southwest Guizhou-north Guangxi area. Combined with rock types and its geochemical features, it is implied that the Neoproterozoic Early Tonian magmatic rocks in western part of Jiangnan Orogen were formed by the subduction-collision process of Yangtze and Cathaysia blocks, and the Late Tonian magmatic rocks were formed by the rifting process of South China Craton.
In order to obtain the geochronologic sequence of the Neoproterozoic magmatism in Fanjingshan area of the western Jiangnan Orogen and to provide a reliable foundation of chronological study in the typical area for comprehensive comparison and for geopark declaration and science popularization, the paper reports the zircon U-Pb dating of a newly discovered diabase in Fanjingshan area. The result shows that the diabase was formed at 805.3 ± 4.5 Ma. The authors also sorted and summarized the existing age reports in a comprehensive and systematic way, and hold that the end of the eruption of basalts was 840 Ma. There were two periods of basic-ultrabasic magmatism(831 Ma, 814～805 Ma) and two periods of acid magmatism(855 Ma, 834 Ma) that occurred in Fanjingshan area during Neoproterozoic. The magmatic geochronology sequence of Fanjingshan area largely corresponds to that of southwest Guizhou-north Guangxi area. Combined with rock types and its geochemical features, it is implied that the Neoproterozoic Early Tonian magmatic rocks in western part of Jiangnan Orogen were formed by the subduction-collision process of Yangtze and Cathaysia blocks, and the Late Tonian magmatic rocks were formed by the rifting process of South China Craton.
引文
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(1)中国国土资源航空物探遥感中心.黔东地区重点航磁异常研究报告. 2016.
(2)贵州一〇八地质队第三分队.贵州省梵净山区1∶50000区域地质调查报告. 1974.
[2]Li X H,Li W X,Li Z X,et al.Amalgamation between the Yangtze and Cathaysia Blocks in South China:constraints from SHRIMP U-Pb zircon ages,geochemistry and Nd-Hf isotopes of the Shuangxiwu volcanic rocks[J].Precambrian Research,2009,174:117-128.
[3]李献华,王选策,李武显,等.华南新元古代玄武质岩石成因与构造意义:从造山运动到陆内裂谷[J].地球化学,2008,37(4):382-398.
[4]Li Z X,Li X H,Kinny P D,et al.Geochronology of Neoproterozoic syn-rift magmatism in the Yangtze Craton,South China and correlations with other continents:Evidence for a mantle super plume that broke up Rodinia[J].Precambriam Research,2003,122:85-109.
[5]Li Z X,Li X H,Li W X,et al.Was Cathaysia part of Proterozoic Laurentia?-new data from Hainan Island,South China[J].Terra Nova,2008,20:154-164.
[6]Li X H,Li Z X,Ge W C,et al.Neoproterozoic granitoids in South China:Crustal melting above a mantle plume at ca.825Ma?[J].Precambriam Research,2003,122:45-83.
[7]Li X H,Li W X,Li Z X,et al.850-790 Ma bimodal volcanic and intrusive rocks in northern Zhejiang,South China:a major episode of continental rift magmatism during the breakup of Rodinia[J].Lithos,2008,102:341-357.
[8]Wang X C,Li Z X,Li X H,et al.Geochemical and Hf-Nd isotope data of Nanhua rift sedimentary and volcaniclastic rocks indicate a Neoproterozoic continental flood basalt provenance[J].Lithos,2011,127:427-440.
[9]Wang X C,Li X H,Li Z X,et al.Episodic Precambrian crust growth:evidence from U-Pb ages and Hf-O isotopes of zircon in the Nanhua Basin,central South China[J].Precambrian Research,2012,222/223:386-403.
[10]Zhang S B,Wu R X,Zheng Y F.Neoproterozoic continental accretion in South China:geochemical evidence from the Fuchuan ophiolite in the Jiangnan orogen[J].Precambrian Research,2012,220:45-64.
[11]Yao J,Cawood P,Shu L,et al.An Early Neoproterozoic Accretionary Prism Ophiolitic Mélange from the Western Jiangnan Orogenic Belt,South China[J].The Journal of Geology,2016,124:587-601.
[12]Yao J,Shu L,Cawood P,et al.Constraining timing and tectonic implications of Neoproterozoic metamorphic event in the Cathaysia Block,South China[J].Precambrian Research,2017,293:1-12.
[13]Wang X L,Zhou J C,Griffin W L,et al.Detrital zircon geochronology of Precambrian basement sequences in the Jiangnan orogen:dating the assembly of the Yangtze and Cathaysia blocks[J].Precambrian Research,2007,159:117-131.
[14]Zhang Y,Wang Y,Geng H,et al.Early Neoproterozoic(~850Ma)back-arc basin in the Central Jiangnan Orogen(Eastern South China):geochronological and petrogenetic constraints from metabasalts[J].Precambrian Research,2013,231:325-342.
[15]Zhou M F,Ma Y X,Yan D P,et al.The Yanbian terrane(Southern Sichuan Province,SW China):a neoproterozoic arc assemblage in the western margin of the Yangtze Block[J].Precambrian Research,2006,144:19-38.
[16]Zhou M F,Yan D P,Wang C L,et al.Subduction-related origin of the 750 Ma Xuelongbao adakitic complex(Sichuan Province,China):implications for the tectonic setting of the giant Neoproterozoic magmatic event in South China[J].Earth and Planetary Science Letters,2006,248:286-300.
[17]Zhou J C,Wang X L,Qiu J S.Geochronology of Neoproterozoic mafic rocks and sandstones from northeastern Guizhou,South China:coeval arc magmatism and sedimentation[J].Precambrian Research,2009,170:27-42.
[18]Cawood P A,Wang Y J,Xu Y J,et al.Locating South China in Rodinia and Gondwana:a fragment of greater India lithosphere[J]?Geology,2013,41:903-906.
[19]Zhao G C.Jiangnan Orogen in South China:Developing from divergent double subduction[J].Gondwana Research,2015,27:1173-1180.
[20]Zheng Y F,Zhang S B,Zhao Z F,et al.Contrasting zircon Hf and O isotopes in the two episodes of Neoproterozoic granitoids in South China:Implications for growth and reworking of continental crust[J].Lithos,2007,96:127-150.
[21]Zheng Y F,Wu R X,Wu Y B.Rift melting of juvenile arc derived crust:Geochemical evidence from Neoproterozoic volcanic and granitic rocks in the Jiangnan Orogen,South China[J].Precambrian Research,2008,163:351-383.
[22]高林志,陈建书,戴传固,等.黔东地区梵净山群与下江群凝灰岩SHRIMP锆石U-Pb年龄[J].地质通报,2014,33:949-959.
[23]Wang X L,Zhou J C,Griffin W L,et al.Geochemical zonation across a Neoproterozoic orogenic belt:Isotopic evidence from granitoids and metasedimentary rocks of the Jiangnan orogen,China[J].Precambrian Research,2014,242:154-171.
[24]Wang J,Shu L,Santosh M.U-Pb and Lu-Hf isotopes of detrital zircon grains from Neoproterozoic sedimentary rocks in the central Jiangnan Orogen,South China:Implications for Precambrian crustal evolution[J].Precambrian Research,2017,294:175-188.
[25]覃永军,杜远生,牟军,等.黔东南地区新元古代下江群的地层年代及其地质意义[J].地球科学,2015,40:1107-1120.
[26]崔晓庄,江新胜,邓奇,等.桂北地区丹洲群锆石U-Pb年代学及对华南新元古代裂谷作用期次的启示[J].大地构造与成矿学,2016,154:1049-1063.
[27]王敏,戴传固,陈建书,等.贵州省梵净山区新元古代岩浆活动的年代学格架及其大地构造意义[J].中国地质,2016,43:843-856.
[28]王敏,戴传固,王雪华,等.贵州梵净山群沉积时代--来自原位锆石U-Pb测年证据[J].岩石矿物学杂志,2012,31:843-857.
[29]王敏.黔东北梵净山地区晚元古代岩浆活动及其大地构造意义[D].中国地质大学(北京)博士学位论文,2012:1-154.
[30]Zhao J H,Zhou M F,Yan D P,et al.Reappraisal of the ages of Neoproterozoic strata in South China:No connection with the Grenvillian orogeny[J].Geology,2011,34:299-302.
[31]张传恒,高林志,史晓颖,等.梵净山群火山岩锆石SHRIMP年龄及其年代地层学意义[J].地学前缘,2014,21:139-143.
[32]王敏,戴传固,王雪华,等.贵州梵净山白云母花岗岩锆石年代、铪同位素及对华南地壳生长的制约[J].地学前缘,2011,18:213-223.
[33]高林志,戴传固,丁孝忠,等.侵入梵净山群白岗岩锆石U-Pb年龄及白岗岩底砾岩对下江群沉积的制约[J].中国地质,2011,38:1413-1420.
[34]高林志,戴传固,刘燕学,等.黔东地区下江群凝灰岩锆石SHRIMP U-Pb年龄及其地层意义[J].中国地质,2010,37(4):1071-1080.
[35]薛怀民,马芳,宋永勤.江南造山带西南段梵净山地区镁铁质-超镁铁质岩:形成时代、地球化学特征与构造环境[J].岩石学报,2012,28:3015-3030.
[36]Su J B,Dong S W,Zhang Y Q,et al.Orogeny processes of the western Jiangnan Orogen,South China:Insights from Neoproterozoic igneous rocks and a deep seismic profile[J].Journal of Geodynamics,2017,103:42-56.
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