| Citation: |
CHENG Haifeng, XU Xuming, LIU Guang, DUAN Bingxin, XU Cui, GUAN Gao. LA-ICP-MS U-Pb geochronology of detrital zircons from the Gudongjing Complex-Group in Pantuoshan area of Beishan region within Inner Mongolia during Changchengian Period and its geological significance[J]. Geological Bulletin of China, 2017, 36(8): 1385-1392.
|
LA-ICP-MS U-Pb geochronology of detrital zircons from the Gudongjing Complex-Group in Pantuoshan area of Beishan region within Inner Mongolia during Changchengian Period and its geological significance
-
Abstract
Changchengian Period Gudongjing Complex-Group serves as the first sedimentary cover on the ancient folded base-ment in Beishan region of Inner Mongolia, but without reliable dating data. Previous researchers assigned it to Mesoproterozoic Changchengian Period only on the basis of the contrast with the Changchengian system of the Yanshan area in such aspects as for-mation layers and rock association characteristics. In this paper, the LA-ICP-MS zircon U-Pb method was used for the determi-nation of the age of the detrital zircon in metamorphic quartz sandstone of the Gudongjing Complex-Group, and the test results show that the 90% ages of zircon 207Pb/206Pb data are 1.3~2.2Ga, the rest of ages are 2.4~3.2Ga, peak period ages are 1.6~2.0Ga, and the youngest 207Pb/206Pb age of detrital zircon is 1393±50Ma. Based on comparing the age spectrum of the detrital zircon with the formation age of the surrounding massif, the dertital zircon limits the sedimentary age of the Gudongjing Complex-Group as the Mesoproterozoic Jixianian Period. The sediments of the Gudongjing Complex-Group might have come from Beishan-Alxa and Tarim-Dunhuang blocks.
-
-
References
[1] 内蒙古地质矿产局.内蒙古自治区岩石地层[M].武汉:中国地质大学出版社, 1996. [2] 甘肃省地质矿产局.甘肃省岩石地层[M].武汉:中国地质大学出版社, 1997. [3] 俞伯达.关于甘肃长城纪地层划分的新认识[J].甘肃地质学报, 1997, 6(1):1-15. [4] 万渝生, 张巧大, 宋天锐.北京十三陵长城系常州沟组碎屑锆石SHRIMP年龄:华北克拉通盖层物源区及最大沉积年龄的限定[J].科学通报, 2003, 48(18):1970-1975. doi: 10.3321/j.issn:0023-074X.2003.18.014 [5] 李任伟, 万渝生, 陈振宇, 等.根据碎屑锆石SHRIMP U-Pb测年恢复早侏罗世大别造山带源区特征[J].中国科学(D辑), 2004, 34(4):320-328. [6] 裴先治, 李佐臣, 李瑞保, 等.祁连造山带东段早古生代葫芦河群变质碎屑岩中碎屑锆石LA-ICP-MS U-Pb年龄:源区特征和沉积时代的限定[J].地学前缘, 2012, 19(5):205-224. [7] 杨合群, 李英, 赵国斌, 等.北山蛇绿岩特征及构造属性[J].西北地质, 2010, 43(4):26-36. [8] Jackson S E, Pearson N J, Griffin W L, et al. The application of laser ablation-inductively coupled plasma-mass speetrometry to in situ U-Pb zircon geochronology[J]. Chemical Geology, 2004, 211:47-69. doi: 10.1016/j.chemgeo.2004.06.017 [9] Liu Y S, Gao S, Hu Z C, et al. Continental and oceanic crust recy-cling-induced melt-peridotite interactions in the Trans North Chi-na Orogen:U-Pb dating, Hf isotopes and trace elements in zircons-from mantle xenoliths[J]. J. Petrol., 2009, 51:537-571. [10] Ludwig K R. User's manual for Isoplot/EX, Version3.00:A geo-chronological Toolkit for Microsoft Excel[M]. Berkeley Geochro-nology Center Special Publication, 2003, 4:1-70. [11] Anderson T. Correction of common lead in U-Pb analyses that donot report 204Pb[J]. Chemical Geology, 2002, 192(1/2):59-79. [12] Sun S S, Mcdonough W F. Chemical and isotopic systematics of oce-anic basalts:implications for mantle composition and processes[J]. Geological Society, London, Special Publications, 1989, 42:313-345. doi: 10.1144/GSL.SP.1989.042.01.19 [13] Zhou M F, Yan D P, Kennedy A K, et al. SHRIMP U-Pb zir-con geochronological and geochemical evidence for Neoprotero-zoicarc magmatism along the western margin of the Yangtze Block, South China[J]. Earth Planet. Sci. Lett., 2002, 196:51-67. doi: 10.1016/S0012-821X(01)00595-7 [14] 谢桂青, 胡瑞忠, 蒋国豪, 等.锆石的成因和U-Pb同位素定年的某些进展[J].地质地球化学, 2001, 29(4):64-70. [15] Spear F S, Parrish R R.Petrology and cooling rates of the Valhalla complex British Columbia, Canada[J]. J. Petrol., 1996, 37:733-765. doi: 10.1093/petrology/37.4.733 [16] 董国安, 杨宏仪, 刘敦一, 等.龙首山岩群碎屑锆石SHRIMP UPb年代学及其地质意义[J].科学通报, 2007, 52(6):688-697. [17] 孟繁聪, 张建新, 相振群, 等.塔里木盆地东北缘敦煌群的形成和演化:锆石U-Pb年代学和Lu-Hf同位素证据[J].岩石学报, 2011, 27(1):59-76. [18] Gehrels G E, Yin A, Wang X F. Magmatic history of the northeast-ern Tibetan Plateau[J]. Geophys. Res., 2003, 108(B9):ETG5-1-ETG5-14. [19] 杨振德, 潘行适, 杨易福, 等.阿拉善断块及邻区地质构造特征与矿产[M].北京:科学出版社, 1988. [20] 沈其韩, 耿元生, 王新社, 等.阿拉善地区前寒武纪斜长角闪岩的岩石学、地球化学、形成环境和年代学[J].岩石矿物学杂志, 2005, 24(1):21-31. [21] 沈其韩, 耿元生, 宋彪, 等.华北和扬子陆块及秦岭-大别造山带地表和深部太古宙基底的新信息[J].地质学报, 2005, 79(5):616-627. [22] 范志伟, 内蒙古额济纳旗北山岩群中石英岩岩组形成时代——LA-ICP-MS锆石U-Pb测年的证据[J].地质找矿论丛, 2015, 30(4):575-581. doi: 10.6053/j.issn.1001-1412.2015.04.014 [23] 汤中立, 来云来.华北板块西南边缘构大型、超大型矿床的地质构造背景[J].甘肃地质学报, 2000, 9(1):1-15. ① 天津市地质调查研究院内蒙古1: 5万1524. 6高地、二龙包西、1580. 8高地、炮台山西幅区域地质矿产调查报告. 2015. -
Access History
Figures(4)
Tables(1)
Export File
Citation
CHENG Haifeng, XU Xuming, LIU Guang, DUAN Bingxin, XU Cui, GUAN Gao. LA-ICP-MS U-Pb geochronology of detrital zircons from the Gudongjing Complex-Group in Pantuoshan area of Beishan region within Inner Mongolia during Changchengian Period and its geological significance[J]. Geological Bulletin of China, 2017, 36(8): 1385-1392.
Format
Content
DownLoad:
-
Figure 1.
Tectonic framework sketch map of the Beishan area (a) and simplified geological map of the study area (b)
-
Figure 2.
Field photo (a) and microphotograph (b) of metamorphic quartz sandstone in the Gudongjing Complex-Group
-
Figure 3.
Cathodoluminescene images of detrital zircons from metamorphic quartz sandstone of the Gudongjing Complex-Group
-
Figure 4.
U-Pb concordia diagram of detrital zircons