华北克拉通西南缘汝阳群沉积时代及其地质意义:来自碎屑锆石U-Pb年龄的证据
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摘要
汝阳群分布在华北克拉通西南缘,位于河南-陕西-山西交界地区,主要为一套未变质的碎屑岩及碳酸盐岩地层,不整合于熊耳群火山岩系之上,其上被洛峪群整合覆盖。长期以来,其地质时代一直存有较大的争议。本文通过对汝阳群下部白草坪组4个石英砂岩样品中的碎屑锆石进行LA-ICP-MS U-Pb年龄测定,获得的~(207)Pb/~(206)Pb年龄分布范围为3 000~1 800 Ma,主要集中在2 600~2 400 Ma之间(约占67%),年龄主峰值为2 550~2 500 Ma,说明其沉积物质主要来源于新太古代末以及古元古代的地质体。其中,最年轻锆石的~(207)Pb/~(206)谐和年龄值分别为1 817±22 Ma、1 838±23Ma、1 924±17 Ma和1 829±28 Ma,说明汝阳群沉积时代不老于1 800 Ma,与其上覆洛峪群中近期获得1 611±8 Ma的年龄相吻合,因此其形成时代应为中元古代早期。
The Ruyang Group distributes in the southwestern margin of the North China Craton,mainly locating in the border of Henan-Shaanxi-Shanxi Province.The Group,covering on the Xiong'er Group with angular unconformity and being overlain consistently by the Luoyu Group,is mainly composed of unmetamorphosed clastic and carbonate strata.In this paper,the authors reports LA-ICP-MS U-Pb ages from four quartz sandstones of the Baicaoping Formation of the Ruyang Group.The youngest ~(207)Pb/~(206)Pb ages arel 817±22 Ma,1 838±23 Ma,1 924±17 Ma and 1829±28 Ma,respectively.Those ages combined with the high-precise dates 1611±8 Ma in the Luoyu Group overlying on the Ruyang Group indicate that the Ruyang Group should be early Mesoproterozoic.The ~(207)Pb/~(206)Pb ages of the detrital zircon range from 3 000 Ma to1 800 Ma,with 67%between 2600 Ma to 2 400 Ma and the main peak of ages(2 550~2 500 Ma),meaning that sedimentary materials mainly sourced from Paleoproterozoic geologic bodies.
The Ruyang Group distributes in the southwestern margin of the North China Craton,mainly locating in the border of Henan-Shaanxi-Shanxi Province.The Group,covering on the Xiong'er Group with angular unconformity and being overlain consistently by the Luoyu Group,is mainly composed of unmetamorphosed clastic and carbonate strata.In this paper,the authors reports LA-ICP-MS U-Pb ages from four quartz sandstones of the Baicaoping Formation of the Ruyang Group.The youngest ~(207)Pb/~(206)Pb ages arel 817±22 Ma,1 838±23 Ma,1 924±17 Ma and 1829±28 Ma,respectively.Those ages combined with the high-precise dates 1611±8 Ma in the Luoyu Group overlying on the Ruyang Group indicate that the Ruyang Group should be early Mesoproterozoic.The ~(207)Pb/~(206)Pb ages of the detrital zircon range from 3 000 Ma to1 800 Ma,with 67%between 2600 Ma to 2 400 Ma and the main peak of ages(2 550~2 500 Ma),meaning that sedimentary materials mainly sourced from Paleoproterozoic geologic bodies.
引文
高林志,尹崇玉,王自强.2002.华北地台南缘新元古代地层的新认识.地质通报,21(3):130-135.Gao Linzhi,Yin Chongyu and Wang Ziqiang.2002.New view of the Neoproterozoic strata on the southern margin of the north China platform.Geological Bulletin of China,21(3):130-135.
耿元生,周喜文.2010.阿拉善地区新元古代岩浆事件及其地质意义.岩石矿物学杂志,29(6):779-795.Geng Yuansheng and Zhou Xiwen.2010.Early Neoproterozoic granite events in Alax area of Inner Mongolia and their geological significance:Evidence from geochronology.Acta Petrologica et Mineralogica,29(6):779-795.
关保德,耿午辰,戎治权等.1988.河南东秦岭北坡中-上元古界.郑州:河南科学技术出版社.1-210.Guan Baode,Geng Wuchen,Rong Zhiquan et al.1988.The Middle and Upper Proterozoic in the Northern Slope of the Eastern Qinling Ranges,Henan,China.Zhengzhou:Henan Science and Technology Press.1-276.
李江海,牛向龙,程素华等.2006.大陆克拉通早期构造演化历史探讨:以华北为例.地球科学,31(3):285-293.Li Jianghai,Niu Xianglong,Cheng Suhua et al.2006.The Early Precambrian tectonic evolution of continental craton:A case study from north China.Earth Science,31(3):285-293.
李猛,刘鹏举,尹崇玉等.2012.河南汝州罗圈村剖面汝阳群白草坪组的微体化石.古生物学报,51(1):76-87.Li Meng,Liu Pengju,Yin Chongyu et al.2012.Acritarchs from the Baicaoping Formation(Ruyang Group)of Henan.Acta Palaeontologica Sinica,51(1);76-87.
马国干,刘树林,邓祝琴.1980.豫西晚前寒武纪汝阳群的海绿石钾-氩年龄与地层对比.中国地质科学院院报宜昌地质矿产研究所分刊,1(2):103-112.Ma Guogan,Liu Shulin and Deng Zhuqin.1980.The K-Ar dating of the glauconite from the Ruyang Group of the Upper Precambrian,west Henan and its stratigraphic correlation.Bulletin of Yichang Institute of Geology and Mineral Resources,Chinese Academy of Geological Sciences,1(2):103-112.
孟凡巍,周传明,尹磊明等.2005.最古老的沟鞭藻:来自山西永济中元古代晚期的化石和分子生物学证据.科学通报,50(12):1234-1238.Meng Fanwei,Zhou Chuanming,Yin Leiming et al.2005.The oldest known dinoflagellates:Morphological and molecular evidence from Mesoproterozoic rocka at Yongji,Shanxi Province.Chinese Science Bulletin,50(12):1234-1238.
彭澎,翟明国.2002.华北陆块前寒武纪两次重大地质事件的特征和性质.地球科学进展,17(6):818-825.Peng Peng and Zhai Mingguo.2002.Two major Precambrian geological events of North China Block(NCB):Characteristics and property.Advances in Earth Science,17(6):818-825.
沈其韩,耿元生,宋彪等.2005.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.地质学报,79(5):616-627.Shen Qihan,Geng Yuansheng,Song Biao et al.2005.New information from the surface outcrops and deep crust of Archean rocks of the north China and Yangtze blocks,and Qinling-Dabie orogenic belt.Acta Geologica Sinica,79(5):616-627.
苏文博,李怀坤,徐莉等.2012.华北克拉通南缘洛峪群-汝阳群属于中元古界长城系——河南汝州洛峪口组层凝灰岩锆石LA-MC-ICPMS U-Pb年龄的直接约束.地质调查与研究,35(2):96-108.Su Wenbo,Li Huaikun,Xu Li et al.2012.Luoyu and Ruyang Group at the south margin of the North China Craton(NCC)should belong in the Mesoproterozoic Changchengian System:Direct constraints from the LA-MC-ICPMS U-Pb.age of the tuffite in the Luoyukou Formation,Ruzhou,Henan,China.Geological Survey and Research,35(2):96-108.
阎玉忠,朱士兴.1992.山西永济白草坪组具刺疑源类的发现及其地质意义.微体古生物学报,9(3):267-282.Yan Yuzhong and Zhu Shixing.1992.Discovery of acanthomorphic acritarchs from the Baicaoping Formation in Yongji,Shanxi and its geological significance.Acta Micropalaeontologica Sinica,9(3):267--282.
尹崇玉,高林志.1999.华北地台南缘汝阳群自草坪组微古植物及地层时代探讨.地层古生物论文集,27:81-94,Yin Chongyu and Gao Linzhi.1999.Microflora in Baicaoping Formation of Ruyang Group in southern margin of north China platform and discussion.Professional Papers of Stratigraphy and Palaeontology,27;81-94.
尹磊明,袁训来,边立曾等.2004.东秦岭北坡中元古代晚期微体生物群——一个早期生命的新窗口.古生物学报,34(1):1-13.Yin Leiming,Yuan Xunlai,Bian Lizeng et al.2004.Late mesoproterozoic microfossil assemblage on northern slope of eastern Qinling Mountains,China:A new window on early Eukaryotes.Acta Palaeontologica Smtco,34(l):1-13.
尹磊明.1999.论我国新元古代微体浮游植物化石及其生物地层意义.古生物学报,38(2):133-146.Yin Leiming.1999.Neoproterozoic microphytoplanktonic fossils in China and their biostratigraphical implication.Acta Palaeontologica Sinica,38(2):133-146.
尹磊明.2006.中国疑源类化石.北京:科学出版社.1-222.Yin Leiming.2006.Acritarch Fossil of China.Beijing:Science Press.1-222.
翟明国,卞爱国,赵太平.2000.华北克拉通新太古代末超大陆拼合及古元古代末冲元古代裂解.中国科学(D辑),30(增刊):129-137.Zhai Mingguo,Bian Aiguo and Zhao Taiping.2000.The amalgamation of the supercontinent of North China Craton at the end of Neo-Archaean and its breakup during Late Palaeoproterozoic and Meso-Proterozoic.Science in China(Series D),43(suppl.):219-232.
翟明国.2004.华北克拉通2.1-1.7 Ga地质事件群的分解和构造意义探讨.岩石学报,20(6):1343-1354.Zhai Mingguo.2004.2.1-1.7 Ga geological event group and its geotectonie significance.Ada Petrologica Sinica,20(6):1343-1354.
赵太平,徐勇航,翟明国.2007.华北陆块南部元古宙熊耳群火山岩的成因与构造环境:事实与争议.高校地质学报,13(2):191-206.Zhao Taiping,Xu Yonghang and Zhai Mingguo.2007.Petrogenesis and tectonic setting of the Paleoproterozoic Xiong'er Group in the southern part of the North China CratonrA review.Geological Journal of China Universities,13(2):191-206.
Andersen T.2002.Correction of common lead in U-Pb analyses that do not report 204Pb.Chemical Geology,192(1-2):59-79.
Javaux E J,Knoll A H and Walter M R.2001.Morphological and ecological complexity in early eukaryotic ecosystems.Nature,412:66-69.
Prasad B and Asher R.2001.Acritarch biostratigraphy and lithostratigraphic classification of Proterozoic and Lower Paleozoic sediments(Pre-unconformity sequence)of Ganga Basin,India.Paleontograph Indlca,5:1-151.
Xiao S H,Knoll A H,Kaufman A J et al.1997.Neoproterozoic fossils in Mesoproterozoic rocks?Chemostratigraphic resolution of a biostratigraphic conundrum from the North China Platform.Precambrian Research,&4{3-4);197-220.
Yin C Y and Gao L Z.1996.The early evolution of the acanthomorphic acritarchs in China and their biostratigraphical implication.Acta Geologica Sinica,9(2):193-206.
Yin L M,Bian L Z and Yuan X L.2004.Discovery of branched tubular algae and microscopic tubes with annular-helical thickening from the Mesoproterozoic Ruyang Group of Shanxi,North China.Science in China(Series D),47(10)?880-885.
Yin L M and Guan B D.1999.Organic-walled microfossils of Neoproterozoic Dongjia Formation,Lushan County,Henan Province,North China.Precambrian Research,94(1-2)?121-137.
Yin L M and Yuan X L.2007.Radiation of Meso-Neoproterozoic and Early Cambrian protists inferred from the microfossil record of China.Palaeogeography,Palaeoclimatology,Palaeoecology,254(1-2):350-361.
Yin L M.Yuan X L and Meng F W.2005.Protists of the upper Mesoproterozoic Ruyang Group in Shanxi Province,China.Precambrian Research,141(1-2):49-66.
Yin L M and Yuan X L.2003.Review of the microfossil assemblage from the Late Mesoproterozoic Ruyang Group in Shanxi,China.Acta Micropalaeontologica Sinica,20(1):39-46.
Yin L M.1997.Acanthomorphic acritarchs from Meso-Neoproterozoic Shales of the Ruyang Group,Shanxi,China.Review of Paleobotany and Palynology,98(1-2):15-25.
Zhai M G.Guo J H and Liu W J.2005.Neoarchean to Paleoproterozoic continental evolution and tectonic history of the North China Craton.Journal of Asian Earth Sciences,24(5):547-561.
Zhao G C,He Y H and Sun M.2009.The Xiong'er volcanic belt at the southern margin of the North China Craton:Petrographic and geochemical evidence for its outboard position in the Paleo-Mesoproterozoic Columbia Supercontinent.Gondwana Research,16(2):170-181.
Zhao G C,Wilde S A.Cawood P A et al.2001.Archean blocks and their boundaries in the North China Craton;Lithological,geochemical,structural and P-T path constraints and tectonic evolution.Precambrian Research,107(1-2):45-73.
耿元生,周喜文.2010.阿拉善地区新元古代岩浆事件及其地质意义.岩石矿物学杂志,29(6):779-795.Geng Yuansheng and Zhou Xiwen.2010.Early Neoproterozoic granite events in Alax area of Inner Mongolia and their geological significance:Evidence from geochronology.Acta Petrologica et Mineralogica,29(6):779-795.
关保德,耿午辰,戎治权等.1988.河南东秦岭北坡中-上元古界.郑州:河南科学技术出版社.1-210.Guan Baode,Geng Wuchen,Rong Zhiquan et al.1988.The Middle and Upper Proterozoic in the Northern Slope of the Eastern Qinling Ranges,Henan,China.Zhengzhou:Henan Science and Technology Press.1-276.
李江海,牛向龙,程素华等.2006.大陆克拉通早期构造演化历史探讨:以华北为例.地球科学,31(3):285-293.Li Jianghai,Niu Xianglong,Cheng Suhua et al.2006.The Early Precambrian tectonic evolution of continental craton:A case study from north China.Earth Science,31(3):285-293.
李猛,刘鹏举,尹崇玉等.2012.河南汝州罗圈村剖面汝阳群白草坪组的微体化石.古生物学报,51(1):76-87.Li Meng,Liu Pengju,Yin Chongyu et al.2012.Acritarchs from the Baicaoping Formation(Ruyang Group)of Henan.Acta Palaeontologica Sinica,51(1);76-87.
马国干,刘树林,邓祝琴.1980.豫西晚前寒武纪汝阳群的海绿石钾-氩年龄与地层对比.中国地质科学院院报宜昌地质矿产研究所分刊,1(2):103-112.Ma Guogan,Liu Shulin and Deng Zhuqin.1980.The K-Ar dating of the glauconite from the Ruyang Group of the Upper Precambrian,west Henan and its stratigraphic correlation.Bulletin of Yichang Institute of Geology and Mineral Resources,Chinese Academy of Geological Sciences,1(2):103-112.
孟凡巍,周传明,尹磊明等.2005.最古老的沟鞭藻:来自山西永济中元古代晚期的化石和分子生物学证据.科学通报,50(12):1234-1238.Meng Fanwei,Zhou Chuanming,Yin Leiming et al.2005.The oldest known dinoflagellates:Morphological and molecular evidence from Mesoproterozoic rocka at Yongji,Shanxi Province.Chinese Science Bulletin,50(12):1234-1238.
彭澎,翟明国.2002.华北陆块前寒武纪两次重大地质事件的特征和性质.地球科学进展,17(6):818-825.Peng Peng and Zhai Mingguo.2002.Two major Precambrian geological events of North China Block(NCB):Characteristics and property.Advances in Earth Science,17(6):818-825.
沈其韩,耿元生,宋彪等.2005.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.地质学报,79(5):616-627.Shen Qihan,Geng Yuansheng,Song Biao et al.2005.New information from the surface outcrops and deep crust of Archean rocks of the north China and Yangtze blocks,and Qinling-Dabie orogenic belt.Acta Geologica Sinica,79(5):616-627.
苏文博,李怀坤,徐莉等.2012.华北克拉通南缘洛峪群-汝阳群属于中元古界长城系——河南汝州洛峪口组层凝灰岩锆石LA-MC-ICPMS U-Pb年龄的直接约束.地质调查与研究,35(2):96-108.Su Wenbo,Li Huaikun,Xu Li et al.2012.Luoyu and Ruyang Group at the south margin of the North China Craton(NCC)should belong in the Mesoproterozoic Changchengian System:Direct constraints from the LA-MC-ICPMS U-Pb.age of the tuffite in the Luoyukou Formation,Ruzhou,Henan,China.Geological Survey and Research,35(2):96-108.
阎玉忠,朱士兴.1992.山西永济白草坪组具刺疑源类的发现及其地质意义.微体古生物学报,9(3):267-282.Yan Yuzhong and Zhu Shixing.1992.Discovery of acanthomorphic acritarchs from the Baicaoping Formation in Yongji,Shanxi and its geological significance.Acta Micropalaeontologica Sinica,9(3):267--282.
尹崇玉,高林志.1999.华北地台南缘汝阳群自草坪组微古植物及地层时代探讨.地层古生物论文集,27:81-94,Yin Chongyu and Gao Linzhi.1999.Microflora in Baicaoping Formation of Ruyang Group in southern margin of north China platform and discussion.Professional Papers of Stratigraphy and Palaeontology,27;81-94.
尹磊明,袁训来,边立曾等.2004.东秦岭北坡中元古代晚期微体生物群——一个早期生命的新窗口.古生物学报,34(1):1-13.Yin Leiming,Yuan Xunlai,Bian Lizeng et al.2004.Late mesoproterozoic microfossil assemblage on northern slope of eastern Qinling Mountains,China:A new window on early Eukaryotes.Acta Palaeontologica Smtco,34(l):1-13.
尹磊明.1999.论我国新元古代微体浮游植物化石及其生物地层意义.古生物学报,38(2):133-146.Yin Leiming.1999.Neoproterozoic microphytoplanktonic fossils in China and their biostratigraphical implication.Acta Palaeontologica Sinica,38(2):133-146.
尹磊明.2006.中国疑源类化石.北京:科学出版社.1-222.Yin Leiming.2006.Acritarch Fossil of China.Beijing:Science Press.1-222.
翟明国,卞爱国,赵太平.2000.华北克拉通新太古代末超大陆拼合及古元古代末冲元古代裂解.中国科学(D辑),30(增刊):129-137.Zhai Mingguo,Bian Aiguo and Zhao Taiping.2000.The amalgamation of the supercontinent of North China Craton at the end of Neo-Archaean and its breakup during Late Palaeoproterozoic and Meso-Proterozoic.Science in China(Series D),43(suppl.):219-232.
翟明国.2004.华北克拉通2.1-1.7 Ga地质事件群的分解和构造意义探讨.岩石学报,20(6):1343-1354.Zhai Mingguo.2004.2.1-1.7 Ga geological event group and its geotectonie significance.Ada Petrologica Sinica,20(6):1343-1354.
赵太平,徐勇航,翟明国.2007.华北陆块南部元古宙熊耳群火山岩的成因与构造环境:事实与争议.高校地质学报,13(2):191-206.Zhao Taiping,Xu Yonghang and Zhai Mingguo.2007.Petrogenesis and tectonic setting of the Paleoproterozoic Xiong'er Group in the southern part of the North China CratonrA review.Geological Journal of China Universities,13(2):191-206.
Andersen T.2002.Correction of common lead in U-Pb analyses that do not report 204Pb.Chemical Geology,192(1-2):59-79.
Javaux E J,Knoll A H and Walter M R.2001.Morphological and ecological complexity in early eukaryotic ecosystems.Nature,412:66-69.
Prasad B and Asher R.2001.Acritarch biostratigraphy and lithostratigraphic classification of Proterozoic and Lower Paleozoic sediments(Pre-unconformity sequence)of Ganga Basin,India.Paleontograph Indlca,5:1-151.
Xiao S H,Knoll A H,Kaufman A J et al.1997.Neoproterozoic fossils in Mesoproterozoic rocks?Chemostratigraphic resolution of a biostratigraphic conundrum from the North China Platform.Precambrian Research,&4{3-4);197-220.
Yin C Y and Gao L Z.1996.The early evolution of the acanthomorphic acritarchs in China and their biostratigraphical implication.Acta Geologica Sinica,9(2):193-206.
Yin L M,Bian L Z and Yuan X L.2004.Discovery of branched tubular algae and microscopic tubes with annular-helical thickening from the Mesoproterozoic Ruyang Group of Shanxi,North China.Science in China(Series D),47(10)?880-885.
Yin L M and Guan B D.1999.Organic-walled microfossils of Neoproterozoic Dongjia Formation,Lushan County,Henan Province,North China.Precambrian Research,94(1-2)?121-137.
Yin L M and Yuan X L.2007.Radiation of Meso-Neoproterozoic and Early Cambrian protists inferred from the microfossil record of China.Palaeogeography,Palaeoclimatology,Palaeoecology,254(1-2):350-361.
Yin L M.Yuan X L and Meng F W.2005.Protists of the upper Mesoproterozoic Ruyang Group in Shanxi Province,China.Precambrian Research,141(1-2):49-66.
Yin L M and Yuan X L.2003.Review of the microfossil assemblage from the Late Mesoproterozoic Ruyang Group in Shanxi,China.Acta Micropalaeontologica Sinica,20(1):39-46.
Yin L M.1997.Acanthomorphic acritarchs from Meso-Neoproterozoic Shales of the Ruyang Group,Shanxi,China.Review of Paleobotany and Palynology,98(1-2):15-25.
Zhai M G.Guo J H and Liu W J.2005.Neoarchean to Paleoproterozoic continental evolution and tectonic history of the North China Craton.Journal of Asian Earth Sciences,24(5):547-561.
Zhao G C,He Y H and Sun M.2009.The Xiong'er volcanic belt at the southern margin of the North China Craton:Petrographic and geochemical evidence for its outboard position in the Paleo-Mesoproterozoic Columbia Supercontinent.Gondwana Research,16(2):170-181.
Zhao G C,Wilde S A.Cawood P A et al.2001.Archean blocks and their boundaries in the North China Craton;Lithological,geochemical,structural and P-T path constraints and tectonic evolution.Precambrian Research,107(1-2):45-73.
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