Abstract
Huge diabase occurs within the Proterozoic strata in the southern margin of the North China Block, geographically in the northern parts of Anhui and Jiangsu provinces, where no strata younger than Neoproterozoic have been found. Zircons from the diabase show three different structures from cathodoluminesecence imaging, but they are all of magmatic origin. SHRIMP U-Pb dating yields a range of 206Pb/238U ages from 2600 to 124 Ma, but two geological events can clearly be identified from both concordant and discordant ages. One gives two weighted mean 207Pb/206Pb ages of 976 ± 24 and 1038 ± 26 Ma which are interpreted as timing of diabase crystallization, and the other has a weighted mean 207Pb/206Pb age of 2523 ± 52 Ma that represents formation time of inherited zircon from the old crust. The dating results indicate that the mafic magmatic event occurred in a transition period from the latest Mesoproterozoic to the earliest Neoproterozoic, consistent with global subduction of Grenvill ocean crust to result in the assembly of supercontinent Rodinia. Therefore, the North China Block needs to be taken into account when reconstructing the position of China continents within the framework of Rodinia supercontinent.
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References
Lu S N From Rodinia to Gondwanaland supercontinents — thinking about problems of researching Neoproterozoic supercontinents. Earth Science Frontiers (in Chinese), 2001, 8(4): 441–448
Pan G Q, Liu J R, Kong Q Y, et al. Study on Sinian geological events in Xuzhou, Suzhuo area and discussion on their origin. Geol J China Univ (in Chinese), 2000, 6(4): 566–575
Zheng Y F, Wu Y B, Chen F K, et al. Zircon U-Pb and oxygen isotope evidence for a large-scale 18O depletion event in igneous rocks during the Neoproterozoic. Geochim Cosmochim Acta, 2004, 68(20): 4145–4165
Yang J S, Shi R D, Wu C L, et al. Recognition of Neoproterozoic ophiolite on the northern margin of the Qaidam basin: evidence of the breakup of Rodinia? Geol Bull China (in Chinese), 2004, 23(9–10): 892–898
Zhang C L, Yang C, Shen J L, et al. SHRIMP age of the Neoproterozoic gneissic granites in the north area of west Kunlun and the implications. Geol Rev (in Chinese), 2003, 49(3): 239–244
Zhang C L, Yang C, Shen J L. Geochemistry of the Neoproterozoic diabase and basalt in south of Tarim plate: evidence for the Neoproterozoic breakup of the Rodinia supercontinent in south Tarim. Acta Petrologica Sinica, 2004, 20(3): 473–482
Qiao X F, Gao L Z, Peng Y. Neoproterozoic in Paleo-Tanlu Fault Zone (in Chinese). Bei**g: Geological Publishing House, 2001, 1–128
Wang Z X, Tang Z M, Yang Z Z, et al. Mesozoic ductile deformation in Dalian areas. Seismlogy and Geology, 2000, 22: 379–386.
Yang J H, Wu F Y, Zhang Y B. Identification of Mesoproterozoic zircons in a Triassic dolerite from the Liaodong Peninsula, Northeast China. Chin Sci Bull, 2004, 49(18): 1958–1962
Song B, Zhang Y H, Wan Y S, et al. The mount making for and the procedure of SHRIMP dating. Geol Rev (in Chinese), 2002, 48(supp): 26–30
Zhao G C, Cawood P A, Wilde S A, et al. Review of global 2.1-1.8 Ga orogens Implications for a pre-Rodinia Supercontinent. Earth Sci Rev, 2002, 59: 125–162
Li Z X, Li X H, Kinny P D, et al. Geochronology of Neoproterozoic syn-rift magmatism in the Yangtze Craton, South China and correlations with other continents Evidence for a mantle superplume that broke up Rodinia. Precambrian Res, 2003, 122: 85–109
Li W X, Li X H, Li Z X. Neoproterozoic bimodal magmatism in the Cathaysia Block of South China and its tectonic significance. Precambrian Res, 2005, 136: 51–66
Li Z X, Li X H, Kinny P D, et al. Geochronology of Neoproterozoic syn-rift magmatism in the Yangtze Craton, South China and correlations with other continents: evidence for a mantle superplume that broke up Rodinia. Precambrian Res, 2003, 122(1–4): 45–83
Tack L, Wingate M T D, Liegeois J P, et al. Early Neoproterozoic magmatism of the Zadinian and Mayumbian Groups (Bas-Congo): onset of Rodinian rifting at the western edge of the Congo craton. Precambrian Res, 2001, 110(1–4): 277–306
Watt G R, Thrane K. Early Neoproterozoic events in East Greenland. Precambrian Res, 2001, 110(1–4): 165–184
Fredrik A, Åke Johansson H, Åke Larson Sven. Age and emplacement of late Sveconorwegian monzogabbroic dykes, SW Sweden. Precambrian Res, 2004, 128: 39–55
Li X H U-Pb zircon age of granites from the southern margin of Yangtze Block and the timing of Neoproterozoic **ning Orogeny in SE China Termination of Rodinia assembly? Precambrian Res, 1999, 97: 43–57
Li Z X, Moonsup Cho, Li X H. Precambrian tectonics of East Asia and relevance to supercontinent evolution Precambrian Res, 2003, 122(1–4): 1–6
Li X H, Li Z X, Ge W, et al. Neoproterozoic granitoids in South China crustal melting above a mantle plume at ca 825 Ma? Precambrian Res, 2003, 122(1–4): 45–83
Li Z X, Li X H, Kinny P D, et al. The breakup of Rodinia: Did it start with a mantle plume beneath South China? Earth Planet Science Letters, 1999, 173: 171–181
Zhou J B, Zheng Y F, Wu Y B. U-Pb zircon age of the Wulian granites in northwest Sulu orogenic belt and the geological implications. Chin Sci Bull, 2003, 48(4): 379–384
Zheng Y F, Fu B, Gong B, et al. Stable isotope geochemistry of ultrahigh pressure metamorphic rocks from the Dabie-Sulu orogen in China Implications for geodynamics and fluid regime. Earth Sci Rev, 2003, 62: 105–161
Wu Y B, Zheng Y F, Zhou J B. Neoproterozoic granitoid in northwest Sulu and its bearing on the North China-South China Blocks boundary in east China. Geophy Res Lett, 2004, 31, L07616, doi:10.1029/2004GL019785
Zheng Y F. Neoproterozoic magmatism and global changes. Chin Sci Bull, 2004, 48(16): 1639–1656
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Liu, Y., Gao, L., Liu, Y. et al. Zircon U-Pb dating for the earliest Neoproterozoic mafic magmatism in the southern margin of the North China Block. CHINESE SCI BULL 51, 2375–2382 (2006). https://doi.org/10.1007/s11434-006-2114-0
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DOI: https://doi.org/10.1007/s11434-006-2114-0