滇中北部昆阳群凝灰岩SHRIMP锆石U-Pb年龄及其地层学意义
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摘要
滇中昆阳群一直是华南前寒武纪地质研究的热点之一,其地层序列、时代与区域对比长期存在争议。通过对滇中易门县小街乡普家村-岔河水库剖面禄表组2个凝灰岩样品进行SHRIMP锆石U-Pb定年,获得禄表组凝灰岩的锆石206Pb/238U年龄为878.5±4.7Ma和878.0±4.0Ma,首次证实禄表组的形成时代为新元古代中期。禄表组凝灰岩SHRIMP锆石U-Pb年龄的获得,有利于正确认识昆阳群的划属关系,并为西南地区青白口纪地层格架的建立和对比提供可靠的年代学依据。
The Kunyang Group in the Central Yunnan Province, whose stratigraphic sequence and stratigraphic correlation are controversial, are always the research focus of Precambrian geology. Two zircon dating ages(878.5±4.7 Ma and 878.0±4.0 Ma) of tuff bedding from the Lubiao Formation in Yimen County are reported in this paper. Zircon dating of tuff bedding indicates that the formation occurred in Middle Neoproterozoic, which is the first report from the Lubiao Formation. Combined with a large number of high precision ages obtained from Kunyang Group, these stratigraphic ages provide important evidence for the acceptable division of Kunyang Group, and also offer reliable chronological data for the setting up of the Qingbaikou System in Southwest China.
The Kunyang Group in the Central Yunnan Province, whose stratigraphic sequence and stratigraphic correlation are controversial, are always the research focus of Precambrian geology. Two zircon dating ages(878.5±4.7 Ma and 878.0±4.0 Ma) of tuff bedding from the Lubiao Formation in Yimen County are reported in this paper. Zircon dating of tuff bedding indicates that the formation occurred in Middle Neoproterozoic, which is the first report from the Lubiao Formation. Combined with a large number of high precision ages obtained from Kunyang Group, these stratigraphic ages provide important evidence for the acceptable division of Kunyang Group, and also offer reliable chronological data for the setting up of the Qingbaikou System in Southwest China.
引文
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①云南地质局. 1/20万云南省地质图(昆明幅). 1971.
[2]高林志,尹崇玉,丁孝忠,等.华南地区新元古代年代地层标定及地层对比[J].地球学报, 2015, 36(5):533-545.
[3]高林志,尹崇玉,张恒,等.云南晋宁地区柳坝塘组凝灰岩SHRIMP锆石U-Pb年龄及其对晋宁运动的制约[J].地质通报,2015, 34(9):1595-1604.
[4]乔秀夫,高林志,张传恒.中朝板块中、新元古界年代地层柱与构造环境新思考[J].地质通报, 2007, 26(5):503-509.
[5]吴懋德,段锦荪,宋学良,等.云南昆阳群地质[M].昆明:云南科技出版社, 1990.
[6]李怀坤,张传林,姚春彦,等.扬子西缘中元古代沉积地层锆石U-Pb年龄及Hf同位素组成[J].中国科学:地球科学, 2013, 43(8):1287-1298.
[7]鄢芸樵.对“昆阳群的层序及顶底问题”一文的商榷[J].地质论评,1986, 22(3):295-299.
[8]戴恒贵.康滇地区昆阳群和会理群地层、构造及找矿靶区研究[J].云南地质, 1997, 16(1):1-39.
[9]邓家藩,谢振西,申玉莲.云南前震旦系层序及几个地质问题[C]//中国地质学会云南省分会1963年首届学术年会论文选集, 1963.
[10]鄢芸樵.再评“唐房运动”与“龙川运动”[J].云南地质, 1994, 13(2):230-232.
[11]吕世琨,戴恒贵.康滇地区建立昆阳群(会理群)层序的回顾和重要赋矿层位的发现[J].云南地质, 2001, 20(1):1-24.
[12]吴懋德,李希勣.云南昆阳群的两种底辟构造[J].地质学报,1981, 55(2):105-117, 163.
[13]中国地质调查局科技外事部.扬子地台西缘前寒武纪地层野外现场会纪要[J].地层学杂志, 2010, 34:336.
[14]张传恒,高林志,武振杰,等.滇中昆阳群凝灰岩SHRIMP锆石U-Pb年龄:华南格林威尔期造山的证据[J].科学通报, 2007,(7):818-824.
[15]郝杰,翟明国.罗迪尼亚超大陆与晋宁运动和震旦系[J].地质科学, 2004, 39(1):139-152.
[16]颜丹平,周美夫,宋鸿林.等,华南在Rodinia古陆中位置的讨论——扬子地块西缘变质-岩浆杂岩证据及其与Seychelles地块的对比[J].地学前缘, 2002, 9(4):249-256.
[17]纪星星,周诗,陈棋,等.滇中地区昆阳群物源及构造环境[J].中国地质, 2016, 43(3):857-878.
[18]郝杰,李曰俊,胡文虎.晋宁运动与震旦系及有关问题的讨论[J].中国区域地质, 1992, 3(2):131-140.
[19]Zhang H, Gao L Z, Zhang C H, et al. The Discovery of the 2.35Ga Crystalline Basement in the Southwest of the Yangtze Block and its Geological Significance[J]. Acta Geologica Sinica, 2018, 92(6):2460-2461.
[20]李希勣,吴懋德,段锦荪.昆阳群的层序及顶底问题[J].地质论评, 1984, 30(5):399-408.
[21]李希勣,花友仁,李良骥,等.云南东川铜矿地质[J].地质学报,1953, 3(1):76-84.
[22]孙家骢.论昆阳群的划分及对比[J].昆明工学院学报, 1983, 3(1):1-19.
[23]Lance P B, Sandra L K, Charlotte M A, et al. TEMORA 1:a new zircon standard for Phanerozoic U-Pb geochronology[J]. Chemical Geology, 2003, 200:155-170.
[24]Lance P B, Sandra L K, Williams I S, et al. The Application of SHRIMP to Phanerozoic geochronology:a critical appraisal of four zircon standards[J]. Chemical Geology, 2003, 200:171-188.
[25]宋彪,张玉海,万渝生,等.锆石SHRIMP样品靶制作,年龄测定及有关现象讨论[J].地质论评, 2002, 48(S1):26-30.
[26]宋彪,张拴宏,王彦斌,等.锆石SHRIMP年龄测定数据处理时系统偏差的避免[J].岩矿测试, 2006, 25(1):9-14.
[27]Ludwig K R. SQUID 1.02-a user's manual[J]. Berkeley Geo chronology Center Special Publication No. 2. 2002.
[28]Stacey J S, Kramers J D. Approximation of terrestrial lead isotope evolution by two-stage model[J]. Earth Planet. Sci. Lett., 1975, 26:207-221.
[29]云南省地质矿产局.云南省区域地质志[M].北京:地质出版社,1990:1-44.
[30]鄢芸樵,曹仁关,杨暹和.云南陆良牛头山地区浅变质岩系的地层时代及对比[C]//中国地质科学院成都地质矿产研究所文集,1986, 7:3.
①云南地质局. 1/20万云南省地质图(昆明幅). 1971.