52 35 canic-sedimentary sequences we propose that the Yixian Formation in Caozhuang area can be regarded as the lower and middle Yixian Formation in t

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1 GLOBAL GEOLOGY Vol. 35 No. 1 Mar U -Pb K 1 y 1 - K 1 y 2 K 1 y 3 LA -ICP -MS U -Pb ± 1. 4 Ma ± 1. 0 Ma ± 1. 2 Ma - U -Pb P P597 A doi /j. issn Stratigraphic sequences and zircon U -Pb dating of Yixian Formation in Caozhuang area of Xingcheng western Liaoning ZHANG Qian 1 ZHANG Mei-sheng 1 LI Xiao-bo 1 WANG Yi-ni 1 LIU Xue-song 1 2 ZHANG Min-min 1 1. College of Earth Sciences Jilin University Changchun China 2. Museum of Geology Jilin University Changchun China Abstract The Caozhuang area of Xingcheng in southwestern Mesozoic Fuxin -Yixian basin western Liaoning belongs to the Mesozoic Jinxi -Jinzhou -Fuxin -Yixian volcanic eruptive belt. The strata mainly volcanic in composition in the Caozhuang area should be grouped into Yixian Formation through the section measuring and large scaled investigation in this area and can be further divided into three members from in ascending order. The lower member K 1 y 1 consists of glutenite and intermediate intermediate-basic volcanic rocks. The middle member K 1 y 2 consists of lacustrine sediments and intermediate volcanic rocks and the upper member K 1 y 3 consists of intermediate and meta-alkaline volcanic rocks. LA -ICP -MS zircon U -Pb dating of the volcanic and pyroclastic rocks of the Jianshan section reveals that the K 1 y 1 and K 1 y 2 were formed in ± 1. 4 Ma and ± 1. 0 Ma respectively. The weighted mean age of the intrusive trachyandesite in K 1 y 1 is ± 1. 2 Ma consistent with the age obtained from the type section of Yixian Fomation in Fuxin -Yixian basin. Taking the correlation with the vol zhangms@ jlu. edu. cn

2 52 35 canic-sedimentary sequences we propose that the Yixian Formation in Caozhuang area can be regarded as the lower and middle Yixian Formation in the type section with missing its upper part in the Caozhuang area indicating that the center of volcanic eruption was closer to the Fuxin -Yixian basin at that time. Key words stratigraphic sequence Yixian Formation zircon U -Pb dating Early Cretaceous western Liaoning ~ K XXV K -51 -XXXI

1 U -Pb 53 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. Fig. 1 1 22 Geographical position map of studied area K 1 y 3 K 1 y /m > 1 326. 7 589. 1 44. > 30. 0 43.

3 1 U -Pb Fig Geographical position map of studied area K 1 y 3 K 1 y /m > > % 70 ~ 300 mm 50 ~ 60 mm % 50 ~ 60 mm ~ 150 mm 50 ~ mm K 1 y

54 35 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Fig.

4 Fig. 2 2 Geological sketch map of Caozhuang area

5 1 U -Pb ~ 200 mm ~ 150 mm m % ~ 200 mm 2. 3 m m B ± 1. 0 Ma ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ m m K 1 y ~ m ~ 300 mm B ± 1. 2 Ma B ± 1. 4 Ma ~ 200 mm 30 ~ 60 mm 30% ~ 150 mm % 70 ~ 200 mm 30 ~ 60 mm ~ ~ 150 mm

6 56 35

1 U -Pb 57 Lambda Phys- 36 ~ 44 ik GeoLasPro 193 nm ArF 3 32 μm 7500A Glitter 4. 4 U -Pb 2 ISOPLOT 3. 0 23 2. 1 2. 2 6 40 31'36. 3 N 120 36'13. 3 E 10 40 31'25. 5 N 120 36'17. 7 E 23 100 ~ 150 μm 1.

7 1 U -Pb 57 Lambda Phys- 36 ~ 44 ik GeoLasPro 193 nm ArF 3 32 μm 7500A Glitter 4. 4 U -Pb 2 ISOPLOT '36. 3 N '13. 3 E '25. 5 N '17. 7 E ~ 150 μm 1. 2 ~ '45. 3 N '17. 2 E Pb / 207 Pb ± 35 Ma LA -ICP -MS U -Pb Pb / 238 U ~ Ma ± Pb / 238 U B Th /U ~ Ma 5 Fig. 4 4 Cathodoluminescence image of zircons samples from Caozhuang area B ± 49 Ma ± 29 Ma ~ 100 μm ± 1. 2 Ma ~ 3 4 Th /U ~ B ~ 150 μm

8 58 35 Fig. 5 5 U -Pb Zircon U -Pb concordia diagrams and distribution diagrams of 206 Pb / 238 U concordia ages of samples from Caozhuang area

9 1 U -Pb 59 Table 1 1 LA -ICP -MS U -Pb Zircon U -Pb data by LA -ICP -MS for samples of Yixian Formation from Caozhuang area Th /μg g -1 U /μg g -1 Th/U 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ /Ma 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B

10 Th /μg g -1 U /μg g -1 Th/U 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ /Ma 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ B B B B B B B B B B B B B B B B B B B B B B B B B B B B ~ Th /U ~ Pb / 238 U ± 1. 0 Ma ± 1. 4 Ma ± 1. 0 Ma U -Pb ± 7. 0 Ma ± 1. 2 Ma Ar -Ar Ar -Ar SHRIMP U -Pb

11 1 U -Pb 61 U -Pb ± 2. 0 Ma U -Pb ± 1. 4 Ma ± 1. 9 Ma LA -ICP -MS SHRIMP U -Pb 132 ~ 122 Ma 131 ~ 126 Ma 6 3 Fig. 6 6 Stratigraphic correlation of Yixian Formation between Jianshan -Laotan section and Mashenmiao - Songbahu section

12 Ma 3 U -Pb ~ 120 Ma LA - - ICP -MS U -Pb ± 1. 4 Ma ± 1. 2 Ma ± Ma LA -ICP - MS U -Pb Chen P J Dong Z M Zhen S N. An exceptionally wellpreserved theropod dinosaur from the Yixian Formation of 2 - China J. Nature M.

13 1 U -Pb ZHANG Mi-man CHEN Pi-ji WANG Yuan-qing et al. Jehol biota M. Shanghai Shanghai Science and Technology Press Zhou Z H Barrett P M Hilton J. An exceptionally preserved Lower Cretaceous ecosystem J. Nature Hou L H Martin L D Zhou Z H et al. Archaeopteryx to opposite birds -missing link from the Mesozoic of China J. Vertebrata Palasiatica ical significance J. Journal of Jilin University Earth M JI Qiang CHEN Wen WANG Wu-li et al. Mesozoic Jehol Biota of western Liaoning China M. Beijing Geological Publishing House J. WANG Wu-li ZHANG Hong ZHANG Li-jun et al ZHANG Li-jun. Main geological background during the e- volution of Jehol Biota from western Liaoning J. Global Geology J. J PAN Yu-qi HUANG Zhi-an WU Zi-jie et al. Characteristics of volcanic rocks division of eruption cycles of the Yixian Formation in Fuxin Liaoning Province J. Geology and Resources Suppl D istics and mechanism of Mesozoic volcanic-sedimentary basin group of western Liaoning J. Global Geology LA -ICP -MS U -Pb J CHEN Jing-sheng LI Wei-wei LIU Miao et al. U -Pb isotopic age of the volcanic rocks of the Yixian Formation in Jianping Machang of western Liaoning and its geolog- Science Edition M Standard sections of Tuchengzi Stage and Yixian Stage and their stratigraphy palaeontology and tectonic-volcanic actions M. Beijing Geological Publishing House ZHANG Ya-nan LIANG Jun-hong LI Xiao-dong et al. Grain size analysis of sedimentary environment from Jianshangou bed of Yixian Formation in western Liaoning China J. Global Geology Jiang B Y Fürsich F T Hethke M. Depositional evolu- XING De-he. Stratigraphy and paleogeographic characters of Yixian Fomation in western Liaoning doctor s degree thesis D. Changchun Jilin University tion of the Early Cretaceous Sihetun Lake and implications for regional climatic and volcanic history in western Liaoning NE China J. Sedimentary Geology J Yu Y L Slipinski A Leschen R A B et al. New genera JIN Fan. New advances in the Late Mesozoic stratigraphic and species of bark-gnawing beetles Coleoptera research of western Liaoning China J. Vertebrata Palasiatica Smith P E Evensen N M York D et al. Dates and rates in ancient lakes 40 Ar / 39 Ar evidence for an Early Cretaceous age for the Jehol Group Northeast China J. Canadian Journal of Earth Sciences Trogossitidae from the Yixian Formation Lower Cretaceous of western Liaoning China J. Cretaceous Research J HAN Ren-ping XING De-he. Characteristics of lithofacies palaeography of Yixian Formation in western Liaon ing J. Global Geology J XU Min XUE Lin-fu WANG Dong-po. The character- 18. J

14 64 35 JIANG Shu-e LIU Xiao-lin ZHANG Guo-ren et al. Characters of the Mesozoic basins and the basin-range structures in western Liaoning J. Geology and Resources NE China J. Geochimica C / / J YANG Geng GUO Hua LIU Li. Tectonic evolution JI Qiang JI Shu-an REN Dong et al. On the sequence of Mesozoic basins in western Liaoning J. Uranium Geology and age of the protobird-bearing deposits in the Sihetun-Jianshangou area Beipiao western Liaoning 20. C / /Professional Papers of Stratigraphy and Palaeontology M Editor of Chinese Academy of Feological Sci- Bureau of geologic exploration and mineral development ences. Professional Papers of Stratigraphy and Palaeontology of Liaoning Province. lithostratigraphic of Liaoning Province 27. Beijing Geological Publishing House M. Wuhan China University of Geosciences Press J J ZHANG Shao-hua WANG Guo-zhen. Division and correlation of cycle and sub-cycle of Early Cretaceous Yixian Formation in western Liaoning J. Liaoning Geology SUN Ge ZHENG Shao-lin. New proposal on division and correlation of Mesozoic from northeastern China J. Journal of Stratigraphy J JIANG Fu-xing CHEN Jin-hua CAO Mei-zhen et al. J SUN Yong-shan. The fundamental state and conservation status of palaeobios geological relic of Jehol Fauna in western Liaoning J. Fossil Ludwig K R. Isoplot /Ex version a geochronology toolkit for microsoft excel J. Berkeley Geochronology A discussion on the age of the feathered dinosaurs-bearing beds of Liaoning China J. Acta Palaeontologica Sinica Dong Z M. Early Cretaceous dinosaur faunas in China an introduction J. Canadian Journal of Earth Sciences Center Special Publication Swisher Ⅲ C C Wang Y Q Wang X L et al. 40 Ar / 24. J WANG Si-en. Origin evolution and mechanism of the Jehol fauna J. Acta Geologica Sinica Sun G Dilcher D L Zheng S L et al. In search of the first flower a Jurassic angiosperm Archaefructus from Northeast China J. Science Ardating of the lower Yixian Formation Liaoning Province northeastern China J. Chinese Science Bulletin Suppl Wang X L Wang Y Q Zhou Z H et al. Vertebrate faunas and biostratigraphy of the Jehol Group in western Liaoning China J. Vertebrate PalAsiatica Suppl Confuciusornis J Ar / 39 Ar LI Pei-xian CHENG Zheng-wu PANG Qi-qing. The J LUO Qing-hua CHEN Pi-ji ZOU Dong-yu et al. Age of Sinosauropteryx and Confuciusornis- 40 Ar / 39 Ar Laser Single-grain and K -Ar dating of the Yixian Formation horizon and age of the Confuciusornis in Beipiao western Liaoning J. Acta Geologica Sinica M.

15 1 U -Pb CHEN Yi-xian CHEN Wen-ji. Volcanic rocks in western Liaoning and its adjacent areas M. Beijing Seismogical Press et al. The geologic age of Sihetun vertebrate assemblage J. in western Liaoning China evidence from zircon U -Pb dating J. Science Bulletin ZHANG Hong LIU Xiao-ming CHEN Wen et al. The 333. age of the top of the Yixian Formation in the Beipiaoi Yixian area western Liaoning and its importance J. Ar /Ar SHRIMP U /Pb J. Geology in China CHEN Wen ZHANG Yan JI Qiang et al. Age of the U -Pb valuable fossiliferous beds of the Sihetun viliage new J XIAO Gao-qiang GAO Shan HUANG Hua et al. Zircon U-Pb geochronology and geochemistry of Mesozoic volcanic rocks from Dasijiazi area at Zhangwu West Liaoning Province J. Earth Science J CAI Hou-an XU De-bin LI Bao-fang et al. A study on Early Cretaceous volcanic effusion periods and isotope chronology in western Liaoning J. Coal Geology of D China YANG Wei. Geochronology and geochemistry of the 43. Mesozoic volcanic rocks in western Liaoning constraints D on mechanism for the lithospheric thinning in the North HE Miao. Comprehensive strata division and correlation China Craton doctor s degree thesis D. Hefei University of Jurassic -Cretaceous in Northeast China doctor s of Science and Technology of China degree thesis D. Qingdao Shandong University of 38. Science and Technology U -Pb J D. ZHANG Hong LIU Xiao-ming YUAN Hong-lin et al U -Pb isotopic age of the lower Yixian Formation in PEI Fu-ping. Petrology and geochemistry of Mesozoic Lingyuan of western Liaoning and its significance J. volcanic rocks in southern Jilin Province doctor s degree Geological Review thesis D. Changchun Jilin University U -Pb J. U -Pb J MENG Fan-xue GAO Shan LIU Xiao-ming. U -Pb zircon PEI Fu-ping XU Wen-liang YANG De-bin et al. geochronology and geochemistry of volcanic rocks of Mesozoic volcanic rocks in the southern Songliao Basin the Yixian Formation in the Lingyuan area western Lia- Zircon U -Pb ages and their constraints on the nature of oning China J. Geological Bulletin of China U -Pb J WANG Song-shan WANG Yuan-qing HU Hua-guang evidence of Ar /Ar and SHRIMP U -Pb dating J. Journal of Stratigraphy Suppl basin basement J. Earth Science

GLOBAL GEOLOGY Vol. 29 No. 3 Sept P531 A doi /j. issn

29 3 2010 9 GLOBAL GEOLOGY Vol. 29 No. 3 Sept. 2010 1004-5589 2010 03-0363 - 10 1 2 1. 123000 2. 110032-4 4 P531 A doi 10. 3969 /j. issn. 1004-5589. 2010. 03. 002 Characteristics of lithofacies palaeography