江西石城通天寨地质公园晚白垩世河口组碎屑锆石年龄及地质意义
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摘要
江西石城通天寨地区位于南丰-会昌中—新生代盆地带内,区内出露的上白垩统河口组主要为一套陆相冲积扇红色碎屑岩系,自下向上分为3段,分别代表扇根→扇中→扇缘沉积相。通过岩相古地理分析,其物源分别来自北西方向和南东方向的2个隆起蚀源区。采用碎屑锆石LA-ICP-MS测年方法,获得河口组2件样品的111组和108组碎屑锆石有效U-Pb年龄,其年龄谱主要存在104~137Ma、400~418Ma、750~752Ma、1854~1895Ma四个年龄峰值,揭示出蚀源区曾存在4次主要的构造热事件。1854~1895Ma和750~752Ma热事件可能分别是对哥伦比亚和罗迪尼亚超大陆聚散的响应;400~418Ma是对华夏造山带洋陆转换的响应;104~137Ma是古太平板块西缘转化为活动陆缘对华南东缘的构造岩浆热事件的响应。
Tongtianzhai is located in the Nanfeng-Huichang Mesozoic-Cenozoic basin of Shicheng County, Jiangxi Province. The Late Cretaceous Hekou Formation is mainly composed of a red clasolite series in continental alluvial fan, and can be divided into three sections, representing fan root, fan middle and fan margin sedimentary facies from bottom upwards. And the provenance was derived from two uplift erosion areas from the NW and SE direction based on the lithofacies paleogeographic analysis. The authors obtained 111 and 108 detrital zircon U-Pb ages from two samples in the Hekou Formation respectively using the LA-ICP MS geochronology. There are four age peaks in age spectrum. i.e., 104~137 Ma, 400~418 Ma, 750~752 Ma, and 1854~1895 Ma, which showfour main tectonic thermal events in the source area. Thermal events in 1854~1895 Ma and 750~752 Ma may be the response to the meeting and parting of the Columbia and Rodinia supercontinent; thermal event in 400~418 Ma was a response to the ocean-continent conversion of Huaxia orogenic belt; thermal event in 104 ~ 137 Ma was a response of the tectonic magma event on the eastern margin of South China Plate resulting from the transformation of the western margin of the paleo Pacific plate into an active continental margin.
Tongtianzhai is located in the Nanfeng-Huichang Mesozoic-Cenozoic basin of Shicheng County, Jiangxi Province. The Late Cretaceous Hekou Formation is mainly composed of a red clasolite series in continental alluvial fan, and can be divided into three sections, representing fan root, fan middle and fan margin sedimentary facies from bottom upwards. And the provenance was derived from two uplift erosion areas from the NW and SE direction based on the lithofacies paleogeographic analysis. The authors obtained 111 and 108 detrital zircon U-Pb ages from two samples in the Hekou Formation respectively using the LA-ICP MS geochronology. There are four age peaks in age spectrum. i.e., 104~137 Ma, 400~418 Ma, 750~752 Ma, and 1854~1895 Ma, which showfour main tectonic thermal events in the source area. Thermal events in 1854~1895 Ma and 750~752 Ma may be the response to the meeting and parting of the Columbia and Rodinia supercontinent; thermal event in 400~418 Ma was a response to the ocean-continent conversion of Huaxia orogenic belt; thermal event in 104 ~ 137 Ma was a response of the tectonic magma event on the eastern margin of South China Plate resulting from the transformation of the western margin of the paleo Pacific plate into an active continental margin.
引文
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(1)马逸麟,衷存堤,王道英,等.江西石城地质公园综合考察报告.2013.
(2)刘冰权,马逸麟.江西石城地质公园地质图.江西省地质调查研究院内部出版.
[2]姜勇彪,吴志春,郭福生,等.江西石城县通天寨龟裂凸包景观成因初探[J].东华理工大学学报(社会科学版),2013,32(3):213-220.
[3]肖光荣,姚琪,范爱春.江西省晚白垩世层序地层研究[J].资源调查与环境,2013,34(3):141-149.
[4]舒良树,周新民.中国东南部晚中生代构造作用[J].地质论评,2002,3:249-260.
[5]张克信,何卫红,徐亚东,等.中国沉积岩建造与沉积大地构造[M].北京:地质出版社,2017.
[6]Liu Y S,Hu Z C,Gao S,et al.In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Chemical Geology,2008,257(1):1-73.
[7]Liu Y S,Gao S,Hu Z C,et al.Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology,2010,51(1/2):537-571.
[8]Ludwig K R.User's manual for Isoplot 3.0:Geochronological toolkit for Microsoft Excel[J].Berkeley Geochronology Center Special Publication,2003,4:1-70.
[9]Black L P,Kamo S L,Williams L S,et al.The application of SHRIMP to Phanerozoic geochronology;a critical appraisal of four zircon standards[J].Chemical Geology,2003,200(1):171-188.
[10]巫建华,刘飞宇,刘帅.峡江-广丰和三南-寻乌火山岩带晚中生代粗面岩SHRIMP锆石U-Pb年龄[J].地质论评,2011,57(1):125-132.
[11]余达淦,叶发旺,王勇.江西广丰早白垩世中晚期盆地火山-侵入杂岩活动序列确认及地质意义[J].大地构造与成矿学,2001,25(3):271-276.
[12]项媛馨,巫建华.赣南龙南地区余田群玄武岩SHIRMP锆石U-Pb年龄及其地质意义[J].地质通报,2011,31(5):716-725.
[13]巫建华,项媛馨,刘帅.江西南部武夷群及其地质时代[J].地层学杂志,2011,35(2):200-208.
[14]巫建华,项媛馨,钟志菲.江西广丰、玉山盆地橄榄玄粗岩的SHRIMP锆石U-Pb定年和Sr-Nd-Pb-O元素同位素特征[J].岩石矿物学杂志,2014,33(4):645-656.
[15]高林志,黄志忠,丁孝忠,等.庐山筲箕洼组与星子岩群年代地层关系及SHRIMP锆石U-Pb年龄的制约[J].地球学报,2010,33(3):295-304.
[16]张恒,李廷栋,高林志,等.赣东北中元古界铁沙街组石英角斑岩和流纹岩锆石SHRIMP U-Pb年龄、Hf同位素及地球化学特征[J].地质论评,2015,61(1):65-78.
[17]谢国刚,尹国胜.江西庐山发现古元古代结晶基底[J].中国区域地质,1996,(4):97.
[18]王崴平,陈毓川,王登红,等.赣南兴国县良村花岗岩锆石LAICP-MS U-Pb年代学、岩石地球化学与成岩机制研究[J].大地构造与成矿学,2014,38(2):347-358.
[19]舒良树.华南前泥盆纪构造演化:从华夏地块到加里东期造山带[J].高校地质学报,2006,(4):418-431.
[20]王辉,丰成友,赵一鸣,等.闽北钨矿类型与同位素地质年代学[J].地质学报,2015,89(S1):196-197.
[21]Wang X C,Li X H,Li W X,et al.The Bikou basalts in the northwestern Yangtze block,South China:Remnants of 820-810 Ma continental flood basalts?[J].Geological Society of America Bulletin,2008,120(11/12):1478-1492.
[22]Lei X,Shu L S.Pre-Devonian tectonic evolution of the eastern South China Block:Geochronological evidence from detrital zircons[J].中国科学:地球科学,2010,53(10):1427-1444.
(1)马逸麟,衷存堤,王道英,等.江西石城地质公园综合考察报告.2013.
(2)刘冰权,马逸麟.江西石城地质公园地质图.江西省地质调查研究院内部出版.