河北地区中生代标准地层剖面侏罗系/白垩系界线——SHRIMP锆石U-Pb年龄标定
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摘要
在全国地层委员会组织的滦平盆地中生代地层野外考察中,采集了大北沟组凝灰岩样品,其锆石年龄测定结果引发对陆相侏罗系/白垩系界线的思考。冀北滦平地区陆相侏罗系—白垩系发育,各类陆相生物化石极丰富,地层产出大量火山凝灰岩层,是通过岩石地层、生物地层、同位素测年和磁性年代地层综合研究侏罗系/白垩系界线的理想地区。根据生物地层研究,冀北滦平盆地侏罗系/白垩系界线附近的地层为大北沟组和大店子组。根据冀北—辽西地区同位素测年数据,侏罗系/白垩系界线年龄倾向于130Ma。获得榆树下标准剖面大北沟组顶部凝灰岩(斑脱岩)SHRIMP锆石U-Pb同位素年龄为129.9±1.1Ma。
This paper is the record of a field investigation of Mesozoic strata in Luanping County, Hebei Province, which was organized by the Commission on Stratigraphy of China. A tuff sample was collected in the Dabeigou Formation at the top of the Jurassic strata. According to the chronostratigraphic dating, the authors think over the terrestrial Jurassic/Cretaceous boundary based on the tuff zircon dating. The terrestrial Jurassic and Cretaceous strata are well developed in Luanping County, Hebei Province. Various terrestrial fossils are very abundant with a large amount of tuffeous rocks. It is an ideal province for the study of Jurassic/Cretaceous boundary and the Dabeigou Formation and Dadianzi Formation based comprehensively on lithogical stratigraphy, biostratigraphy,chronostratigraphy and magnetostratigraphy. According to the chronostratigraphy, the boundary age of Jurassic/Cretaceous tends to favor the era of 130 Ma. This paper reports a SHRIMP U-Pb age of 129.9±1.1 Ma for tuff of the holitype section of the Dabeigou Formation from Yushuxia Village, Luanping County.
This paper is the record of a field investigation of Mesozoic strata in Luanping County, Hebei Province, which was organized by the Commission on Stratigraphy of China. A tuff sample was collected in the Dabeigou Formation at the top of the Jurassic strata. According to the chronostratigraphic dating, the authors think over the terrestrial Jurassic/Cretaceous boundary based on the tuff zircon dating. The terrestrial Jurassic and Cretaceous strata are well developed in Luanping County, Hebei Province. Various terrestrial fossils are very abundant with a large amount of tuffeous rocks. It is an ideal province for the study of Jurassic/Cretaceous boundary and the Dabeigou Formation and Dadianzi Formation based comprehensively on lithogical stratigraphy, biostratigraphy,chronostratigraphy and magnetostratigraphy. According to the chronostratigraphy, the boundary age of Jurassic/Cretaceous tends to favor the era of 130 Ma. This paper reports a SHRIMP U-Pb age of 129.9±1.1 Ma for tuff of the holitype section of the Dabeigou Formation from Yushuxia Village, Luanping County.
引文
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[20]王思恩.中国北方晚侏罗世晚期—早白垩世早期的新叶肢介化石[J].地质通报,2013,32(7):957-966.
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[22]庞其清,田树刚,李佩贤,等.冀北滦平盆地大北沟组—大店子组介形类生物地层和侏罗系—白垩系界线[J].地质通报,2006,25(3):349-355.
[23]田树刚,庞其清,牛绍武,等.冀北滦平盆地陆相侏罗-白垩系界线候选层型剖面初步研究[J].地质学报,2004,23(12):1170-1179.
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[25]Black L P,Kamo S L,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.
[26]Ludwig K R.SQUID 1.02,a user’s manual[M].Berkeley Geochronology Center Special Publication No.2.2455 Ridge Road,Berkeley,CA 94709,USA,2002.
[27]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.
[2]Kennedy W J,Odin G S.The Jurassic and Cretaceous time scale in1981[C]//Odin G S.Numerical Dating in Stratigraphy[M].John Wiley&Sons,Ltd.,1982:557-592.
[3]王思恩,高林志,万晓樵,等.冀北—辽西地区土城子组的地质时代、年龄及其国际地层对比[J].地质通报,2013,32(11):1673-1689.
[4]王思恩,高林志,庞其清,等.中国陆相侏罗系—白垩系界线及其国际地层对比——以冀北—辽西地区侏罗系—白垩纪年代地层为例[J].地质学报,2015,89(8):1331-1351.
[5]顾道源,侯建国,黄建祥,等.论中国白垩系底界的同位素年龄划分方案[J].地质论评,1987,33(3):275-282.
[6]Remane J(著),金玉玕等(译).国际地层表,国际地层表说明[J].地层学杂志,2000,24(增刊):321-340.
[7]Grabau A W.Cretaceous mollusca from North China[J].Bull.Geol.Serv.China,1923,5(2):129-183.
[8]Grabau A W.Stratigraphy of China[M].Mesozoic.Beijing Commercial Press,1928.
[9]Remane J,Bassett M G,Cowie J W,et al.Revised guidelines for the establishment of global chronostratigraphic standards by the International Commission on Stratigraphy(ICS)[J].Episodes,1996,19(3):77-81.
[10]柳永清,田树刚,李佩贤,等.滦平盆地大北沟组-大店子组沉积和地层格架及陆相层型意义[J].地球学报,2001,22(5):391-396.
[11]庞其清,李佩贤,田树刚,等.冀北滦平张家沟大北沟组-大店子组介形类的发现及生物地层界线研究[J].地质通报,2002,21(6):322-328.
[12]牛绍武,李佩贤,田树刚.冀北滦平盆地大北沟组叶肢介化石研究新进展[J].地质通报,2002,21(6):322-328.
[13]牛绍武.冀北滦平盆地大北沟组叶肢介生物地层特征与大北沟阶单位层型的建立[J].地质通报,2008,27(3):326-344.
[14]田树刚,柳永清,李佩贤.冀北滦平侏罗—白垩系界线层序地层研究[J].中国科学(D辑),2003,33(9):871-880.
[15]田树刚,王乃文.“陆相层型”建立的认识与思考[J].古地理学报,2005,7(4):561-569.
[16]田树刚,牛绍武,庞其清.冀北滦平盆地早白垩世陆相的重新厘定及其层型剖面[J].地质通报,2008,27(6):739-752.
[17]田树刚,牛绍武.早白垩世陆相九佛堂阶的重新厘定及其层型剖面[J].地质通报,2010,29(2/3):173-187.
[18]王思恩.热河动物群的起源、演化与机制[J].地质学报,1990,64(4):350-359
[19]王思恩,季强.冀北张家口组、大北沟组的岩石地层学、生物地层学特征及其在东北亚地层划分对比中的意义[J].地质通报,2009,28(7):821-828.
[20]王思恩.中国北方晚侏罗世晚期—早白垩世早期的新叶肢介化石[J].地质通报,2013,32(7):957-966.
[21]庞其清.河北燕山地区陆相侏罗—白垩系介形类化石及其界限[J].河北地质学院学报,1984,3:1-11.
[22]庞其清,田树刚,李佩贤,等.冀北滦平盆地大北沟组—大店子组介形类生物地层和侏罗系—白垩系界线[J].地质通报,2006,25(3):349-355.
[23]田树刚,庞其清,牛绍武,等.冀北滦平盆地陆相侏罗-白垩系界线候选层型剖面初步研究[J].地质学报,2004,23(12):1170-1179.
[24]Black L P,Kamo S L,Allen C M,et al.TEMORA 1:A new zircon standard for Phanerozoic U-Pb geochronology[J].Chemical Geology,2003,200(1/2):155-170.
[25]Black L P,Kamo S L,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.
[26]Ludwig K R.SQUID 1.02,a user’s manual[M].Berkeley Geochronology Center Special Publication No.2.2455 Ridge Road,Berkeley,CA 94709,USA,2002.
[27]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.