桂中都安钾镁煌斑岩金云母~(40)Ar/~(39)Ar年龄及其构造意义
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摘要
右江褶皱带地处扬子陆块和华夏陆块的结合部位,区内广泛发育以基性-超基性岩墙群和超酸性岩脉为主的燕山晚期双峰式岩浆活动。对桂中都安地区的金云钾镁煌斑岩脉进行了金云母~(40)Ar/~(39)Ar法测年,斑晶和基质金云母样品均给出了较一致的坪年龄,分别为93.6±0.6Ma和92.9±0.6Ma,相应的等时线年龄分别为93.4±0.9Ma和92.7±0.8Ma,上述年龄代表了岩脉的侵位年龄。结合区内报道的同期年代学资料,进一步证明右江褶皱带及其周缘晚白垩世双峰式岩浆活动响应了华南地区燕山晚期的构造转换事件及随后大规模的岩石圈伸展减薄。
The Youjiang Fold Belt is located in the connection region between Yangtze Block and Cathaysia Block. It is characterized by Late Yanshanian bimodal magmatic activities and consists of basic-ultrabasic dyke swarms and ultra-acid rock veins.In this study, the phlogopite ~(40) Ar/~(39) Ar dating of phenocryst and matrix from phlogopite lamproite veins, which are located in the Du'an County of central Guangxi, yielded two plateau ages of 93.6±0.6 Ma, 92.9±0.6 Ma and two isochron ages of 93.4±0.9 Ma, 92.7±0.8 Ma, respectively. These ages are interpreted as the emplacement age for phlogopite lamproite veins. The new results obtained by the authors in junction with the coeval magmatic events further reveal that the voluminous Late Cretaceous bimodal magmatic activities occurred in the Youjiang Fold Belt as well as its peripheral regions in response to the Late Yanshanian tectonic transition and subsequent lithospheric thinning and extension in South China.
The Youjiang Fold Belt is located in the connection region between Yangtze Block and Cathaysia Block. It is characterized by Late Yanshanian bimodal magmatic activities and consists of basic-ultrabasic dyke swarms and ultra-acid rock veins.In this study, the phlogopite ~(40) Ar/~(39) Ar dating of phenocryst and matrix from phlogopite lamproite veins, which are located in the Du'an County of central Guangxi, yielded two plateau ages of 93.6±0.6 Ma, 92.9±0.6 Ma and two isochron ages of 93.4±0.9 Ma, 92.7±0.8 Ma, respectively. These ages are interpreted as the emplacement age for phlogopite lamproite veins. The new results obtained by the authors in junction with the coeval magmatic events further reveal that the voluminous Late Cretaceous bimodal magmatic activities occurred in the Youjiang Fold Belt as well as its peripheral regions in response to the Late Yanshanian tectonic transition and subsequent lithospheric thinning and extension in South China.
引文
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[28]毛建仁.华南燕山期岩浆-成矿作用大爆发与陆内造山运动[C]//中国地质学会.中国地质学会2015学术年会论文摘要汇编(中册).2015.
[29]蔡明海,梁婷,吴德成,等.广西丹池成矿带构造特征及其控矿作用[J].地质与勘探,2004,40(6):5-10.
[30]Li X Y,Zheng J P,Ma Q,et al.From enriched to depleted mantle:Evidence from Cretaceous lamprophyres and Paleogene basaltic rocks in eastern and central Guangxi Province,western Cathaysia block of South China[J].Lithos,2014,184/187(1):300-313.(1).120.1974.
(1)广西壮族自治区地质局. 1∶20万田东幅区域地质调查报告. 1974.
(2)陆刚,黄祥林,李文强,等. 1∶25万南丹幅区域地质调查报告.南广西壮族自治区地质调查院, 2013.
[2]李三忠,臧艺博,王鹏程,等.华南中生代构造转换和古太平洋俯冲启动[J].地学前缘,2017,(4):213-225.
[3]陈懋弘,章伟,杨宗喜,等.黔西南白层超基性岩墙锆石SHRIMPU-Pb年龄和Hf同位素组成研究[J].矿床地质,2009,28(3):240-250.
[4]陈懋弘,陆刚,李新华.桂西北地区石英斑岩脉白云母40Ar/39Ar年龄及其地质意义[J].高校地质学报,2012,18(1):106-116.
[5]蔡明海,何龙清,刘国庆,等.广西大厂锡矿田侵入岩SHRIMP锆石U-Pb年龄及其意义[J].地质论评,2006,52(3):409-414.
[6]谭俊,魏俊浩,李水如,等.广西昆仑关A型花岗岩地球化学特征及构造意义[J].地球科学-中国地质大学学报,2008,33(6):743-754.
[7]程彦博,毛景文,谢桂青,等.云南个旧老厂-卡房花岗岩体成因初探:锆石U-Pb年代学和岩石地球化学约束[J].地质学报,2008,81(11):1478-1493.
[8]程彦博,毛景文,谢桂青,等.与云南个旧超大型锡矿床有关的花岗岩锆石U-Pb定年及意义[J].矿床地质,2009,28(3):297-312.
[9]程彦博,毛景文,陈懋弘,等.云南个旧锡矿田碱性岩和煌斑岩LA-lCP-MS锆石U-Pb测年及其地质意义[J].中国地质,2008,35(6):1138-1149.
[10]程彦博,毛景文,陈小林,等.滇东南薄竹山花岗岩的LA-ICP-MS锆石U-Pb定年及地质意义[J].吉林大学学报(地),2010,40(4):869-878.
[11]刘玉平,李正祥,李惠民,等.都龙锡锌矿床锡石和锆石U-Pb年代学:滇东南白垩纪大规模花岗岩成岩-成矿事件[J].岩石学报,2007,23(5):967-976.
[12]冯佳睿,毛景文,裴荣富,等.云南瓦渣钨矿区老君山花岗岩体的SHRIMP锆石U-Pb定年、地球化学特征及成因探讨[J].岩石学报,2010,26(3):845-857.
[13]曾允孚,刘文均,陈洪德,等.华南右江复合盆地的沉积构造演化[J].地质学报,1995,(2):113-124.
[14]刘观亮,汪雄武,吕学森.大洪山钾镁煌斑岩岩石学、矿物学特征及含矿性研究[M].北京:地质出版社,1993.
[15]Ludwig K R.User's manual for Isoplot,EX Version 3.0:AGeochronological Toolkit for Microsoft Excel[M].Berkeley Geochronology Center,Special Publication,2003.
[16]陈文,张彦,张岳桥,等.青藏高原东南缘晚新生代幕式抬升作用的Ar-Ar热年代学证据[J].岩石学报,2006,22(4):867-872.
[17]李志昌,路远发,黄圭成.放射性同位素地质学方法与进展[M].武汉:中国地质大学出版社,2004.
[18]王登红,陈毓川,陈文,等.广西南丹大厂超大型锡多金属矿床的成矿时代[J].地质学报,2004,78(1):132-138.
[19]蔡明海,梁婷,吴德成.广西大厂锡多金属矿田亢马矿床地质特征及成矿时代[J].地质学报,2005,79(2):262-268.
[20]刘艳宾,莫宣学,张达,等.滇东南老君山地区晚白垩世花岗岩的成因[J].岩石学报,2014,30(11):3271-3286.
[21]董树文,张岳桥,陈宣华,等.晚侏罗世东亚多向汇聚构造体系的形成与变形特征[J].地球学报,2008,29(3):306-317.
[22]Mao J R,Ye H M,Liu K,et al.The Indosinian collisionextension event between the South China Block and the PalaeoPacific plate:Evidence from Indosinian alkaline granitic rocks in Dashuang,eastern Zhejiang,South China[J].Lithos,2013,172/173(4):81-97.
[23]Mao J R,Li Z L,Ye H M.Mesozoic tectono-magmatic activities in South China:Retrospect and prospect[J].Science in China(Ser.D),2014,57(12):2853-2877.
[24]吴福元,葛文春,孙德有,等.中国东部岩石圈减薄研究中的几个问题[J].地学前缘,2003,10(3):51-60.
[25]谢桂青,毛景文,胡瑞忠,等.中国东南部中-新生代地球动力学背景若干问题的探讨[J].地质论评,2005,51(6):613-620.
[26]Li Z X,Li X H.Formation of the 1300km-wide intracontinental orogen and postorogenic magmatic province in Mesozoic South China:A flat-slab subduction model[J].Geology,2007,35(2):179-182.
[27]Wang Y J,Fan W M,Zhang G W,et al.Phanerozoic tectonics of the South China Block:Key observations and controversies[J].Gondwana Research,2013,23(4):1273-1305.
[28]毛建仁.华南燕山期岩浆-成矿作用大爆发与陆内造山运动[C]//中国地质学会.中国地质学会2015学术年会论文摘要汇编(中册).2015.
[29]蔡明海,梁婷,吴德成,等.广西丹池成矿带构造特征及其控矿作用[J].地质与勘探,2004,40(6):5-10.
[30]Li X Y,Zheng J P,Ma Q,et al.From enriched to depleted mantle:Evidence from Cretaceous lamprophyres and Paleogene basaltic rocks in eastern and central Guangxi Province,western Cathaysia block of South China[J].Lithos,2014,184/187(1):300-313.(1).120.1974.
(1)广西壮族自治区地质局. 1∶20万田东幅区域地质调查报告. 1974.
(2)陆刚,黄祥林,李文强,等. 1∶25万南丹幅区域地质调查报告.南广西壮族自治区地质调查院, 2013.