Abstract
Sixty-two geologically meaningful U-Pb dates were obtained by using SHRIMP technique for the detrital zircons in three metasedimentary rocks from stratigraphically uppermost parts of the Longshoushan Group in the present study. Eighty percents of these dates range from 1.7 Ga to 2.2 Ga with a peak at 1.8–2.0 Ga and twenty percents from 2.3 Ga to 2.7 Ga. The youngest detrital zircon is dated at 1724±19 Ma which is interpreted as the maximum depositional age of the metasedimentary rocks. Therefore, the age for the diagenesis and lithification of the original sedimentary rocks of the Longshoushan Group before the metamorphism must be younger than 1724±19 Ma. Comparison of the age histograms of these detrital zircons with the ages of the igneous rocks on the surrounding older massifs suggests that the sediments of the Longshoushan Group were most likely derived from the Alaxa Block and Tarim Craton. This implies that the affinity between Alaxa Block and Tarim Craton was strong and that they might have been a unified craton during middle-early Proterozoic time.
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References
Jin W S, Wang R H, et al. Chinese Standard of Palaeoproterozoic (in Chinese). Beijing: Geological Publishing House, 1996. 35–36
Huang C C, Ren J S, Jiang C F, et al. An outline of the tectonic characteristics of China. Acta Geol Sin (in Chinese with English abstract), 1977, 51(2): 117–135
Ren J S, Jiang C F, Zhang Z K, et al. The Tectonics of China and Its Evolution (in Chinese). Beijing: Science Press, 1980. 124
Bai J, Hunag X G, Wang H C, et al. The Precambrian Crustal Evolution of China. 2nd ed. (in Chinese with English abstract). Beijing: Geological Publishing House, 1993. 259
Lu S N. Preliminary Study of Precambrian Geology in the North Tibet-Qinghai Plateau (in Chinese). Beijing: Geological Publishing House, 2002. 41–43
Xiu Q Y, Lu S N, Yu H F, et al. The Isotopic age evidence for main Longshoushan Group contributing to Palaeoproterozoic. Prog Precam Res(in Chinese with English abstract), 2002, 25(2): 93–96
Xiu Q Y, Yu H F, Li Q, et al. Discussion on the Petrogenic Time of Longshoushan Group, Gansu Province. Acta Geol Sin (in Chinese with English abstract), 2004, 78(3): 366–373
Bureau of Geology and Mineral Resources of Gansu Province. Regional Geology of Gansu Province (in Chinese with English abstract). Beijing: Geological Publishing House, 1989. 10–12
Wan Y S, Zhang Q D, Song T R. Shrimp ages of detrital zircons from the Changcheng System in the Ming Tombs area, Beijing: Constraints on the protolith nature and maximum depositional age of the Mesoproterozoic cover of the North China Caton. Chin Sci Bull, 2003, 48(22): 2500–2506
Bureau of Geology and Mineral Resources of Gansu Province. Stratigraphy (lithostratic) of Gansu Province. Wuhan: China University of Geosciences Press, 1997. 62–64
Yang Z D, Pan X S, Yang Y F. Tectonic Characteristics and Deposits in Alaxa Adjacent Area (in Chinese). Beijing: Science Press, 1988. 1–254
Chung C H. Nd-Sr isotopic and geochemical studies of granitoids, metabasalts and metasediments along the southern margin of the Alashan Terrane, NE China. Master degree Thesis (in Chinese with English abstract). Cheng Kung University, Taiwan, 1999. 94
Wan Y S, Xu Z Q, Yang J S, et al. The Precambrian high-grade basement of the Qilian Terrane and neighboring areas: Its ages and compositions. Acta Geosci Sin (in Chinese with English abstract), 2003, 24(4): 319–324
Tang Z L, Bai Y L. Geotectonic framework and metallogenic system in the southwest margin of North China Paleocontinent. Earth Sci Front (in Chinese), 1999, 6(2): 271–283
Tang Z L, Bai Y L. The Geotectonic setting of the large and superlarge mineral deposits in the southwest margin of North China Paleoplate. Acta Geologica Gansu (in Chinese with English abstract), 2000, 9(1): 1–15
Tang Z L, Bai Y L. The two types of the tectonic foundation block and its metallogenic systems in the Northern Qilianshan orogenic belt. Acta Geologica Gansu (in Chinese with English abstract), 2001, 10(2): 1–11
Darby B J, Gehrels G. Detrital zircon reference for the North China block. J Asian Earth Sci, 2006, 26(6): 637–648
Gehrels G E, Yin A, Wang X F. Detrital-zircon geochronology of the northeastern Tibetan plateau. Geol Soc Am Bull, 2003, 5(7): 881–896
Yue Y J, Graham S A, Ritts B D, et al. Detrital zircon provenance for large-scale extrusion along the Altyn Tagh Fault. Tectonophysics, 2005, 406: 165–178
Zhao G C, Wilde S A, Cawood P A, et al. SHRIMP U-Pb zircon ages of the Fuping Complex: implications for late Archean to Paleoproterozoic accretion and assembly of the North China Craton. Am J Sci. 2002, 302: 191–226
Xia X P, Sun M, Zhao G C, et al. LA-ICP-MS U-Pb geochronology of detrital zircons from the Jining Complex, North China Craton and its tectonic significance. Prec Res, 2006, 144: 199–212
Xia X P, Sun M, Zhao G C, et al. U-Pb and Hfisotopic study of detrital zircons from the Wulashan khondalites: Constraints on the evolution of the Ordos Terrane, Western Block of the North China Craton. Earth Planet Sci Lett, 2006, 241: 581–593
Compston W, Williams I S, Meyer C. U-Pb gesochronology of zircons from lunar breccia 73217 using a sensitive high mass-resolution ion microprobe. Proceedings of the 14th Lunar and Planetary Science Conference, Part 2. J Geophys Res, 1984, 89: B525–534
Black L P, Kamo S L, Allen C M, et al. TEMORA 1: A new zircon standard for Phanerozoic U-Pb geochronology. Chem Geol, 2003, 200: 155–170
Ludwig K R, Isoplot/Ex version 2.4. A Geochronological Toolkit for Microsoft Excel, Berkeley Geochron Centre Spec Publ, 2000. 1–56
Spear F S, Parrish R R. Petrology and cooling rates of the Valhalla complex, British Columbia, Canada. J Petrol, 1996, 37: 733–765
Shen Q H, Geng Y S, Wang X S, et al. Petrology, geochemistry, formation environment and age of Precambrian amphibolites in Alaxa region. Acta Petrol Mineral (in Chinese with English abstract), 2005, 24(1): 21–31
Shen Q H, Geng Y S, Song B, et al. 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 Geol Sin (in Chinese with English abstract), 2005, 79(5): 616–627
Guo Z J, Zhang Z C, Liu S W, et al. U-Pb geochronological evidence for the early Precambrian complex of the Tarim Craton, NW China. Acta Petrol Sin (in Chinese with English abstract), 2003, 19(3): 537–542
Gehrels G E, Yin A. Wang X F. Magmatic history of the northeastern Tibetan Plateau. J Geophys Res, 2003, 108(B9): ETG5-1-14
Li X H, Su L, Song B, et al. Shrimp U-Pb zircon age of the Jingchuan ultramafic intrusion and its geological significance. Chin Sci Bull, 2004, 49(4): 420–422
Li X H, Su L, Chung S L, et al. Formation of the Jingchuan ultramafic intrusion and world’s third Largest Ni-Cu sulfide deposit: Associated with the ∼ 825 Ma south China mantle plume? Geochem Geophys Geosystems, 2005, 6(11): 1–16
Xu B, Jian P, Zheng H F, et al. U-Pb zircon geochronology and geochemistry of Neoproterozoic volcanic rocks in the Tarim Block of northwest China: implications for the breakup of Rodinia supercontinent and Neoproterozoic glaciations. Prec Res, 2005, 136: 107–123
Huang B C, Xu B, Zhang C X, et al. Paleomagnetism of the Baiyisi volcanic rocks (ca. 740 Ma) of Tarim, Northwest China: A continental fragment of Neoprozoic Western Australia? Prec Res, 2005, 142: 83–92
Xu Z Q, Yang J S, Zhang J X, et al. A comparison between the tectonic units on the two sides of the Altun Sinitral strike-slip fault and the mechanism of lithospheric shearing. Acta Geol Sin (in Chinese with English abstract), 1999, 73(3): 193–205
Ge X H, Liu J L. Broken “Western China Craton”. Acta Petrol Sin (in Chinese with English abstract), 2000, 16(1): 59–66
Wang Y S, Chen J N. Metamorphic Zones and Metamorphism in Qinghai Province and Its Adjacent Area (in Chinese with English abstract). Beijing: Geological Publishing House, 1987. 268
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Supported by the Chinese Development and National Science Council (Grant Nos. 91-2116-M-006-16 and 92-2116-M-006-010)
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Tung, K., Yang, H., Liu, D. et al. SHRIMP U-Pb geochronology of the detrital zircons from the Longshoushan Group and its tectonic significance. CHINESE SCI BULL 52, 1414–1425 (2007). https://doi.org/10.1007/s11434-007-0189-x
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DOI: https://doi.org/10.1007/s11434-007-0189-x