Abstract
A small-sized meta-basic rock system is discovered in Qilongwuru Gully of Central Qiangtang’s Shuanghu region and contains a meta-basalt and garnet-bearing plagioclase amphibolite. The zircon U/Pb age of this meta-basalt by SHRIMP analysis is 463.3±4.7 Ma, suggesting that this lava formed in the Middle Ordovician, and is consistent with that of the meta-basic rocks in the Taoxing Lake and Guoganjianian Mountain ophiolite found in the Qiangtang plate. As this lava system bears similar geochemistry to N-MORB, it might be a component of ophiolite that represents the trail of the extinction of the Proto-Tethys, suggesting that the formation of Proto-Tethys oceanic basin in the Longmu Co-Shuanghu suture zone could date as far back as to the Middle Ordovician. Isotopic geochemical analysis indicates that the magma source area consists of both depleted mantle (DM) and enriched mantle (EMII) end members and bears Dupal anomaly, similar to that of the Paleo-Tethys in the Neo-Tethys represented by the Yarlung-Tsangpo suture zone, the Paleo-Tethys represented by the Changning-Menglian suture zone, and the Paleo-Tethys in Sanjiang region. This suggests that they have inherited the attribute of the Proto-Tethys mantle domain, and the Longmu Co-Shuanghu suture zone may be a representative of the northern boundary of Gondwana.
Similar content being viewed by others
References
Acharyya S K. 2000. Break up of Australia-India-Madagascar block, opening of the India ocean and continental accretion in southeast Asia with social reference to the characteristics of the Peri-Indian collision zones. Gondwana Res, 3: 425–443
Bao P S, Xiao X C, Wang J, et al. 1997. The blueschist belt in the Shuanghu region, central-northern Tibet and its tectonic implications (in Chinese). Acta Geol Sin, 73: 302–314
Deng W M, Yin J X, Guo Z P. 1996a. Basic-ultrabasic and volcanic rocks in Chagbu-Shuanghu area of northern Xizang (Tibet), China. Sci China Ser D-Earth Sci, 39: 359–368
Deng W M. 1996b. Paleo-Tethyan Ophiolites and the “Northern Boundary of Gondwana” in Tibetan Plateau. In: Zhang Q, ed. Ophiolites and Geodynamic Research (in Chinese). Beijing: Geological Publishing House. 172–176
Deng X G, Ding L, Liu X H, et al. 2002. Geochemical characteristics of the blueschists and its tectonic significance in the central Qiangtang area of Tibet (in Chinese). Acta Petrol Sin, 18: 517–525
Dupre B, Allegre C J. 1983. Pb-Sr isotope variation in Indian ocean basalts and mixing phenomena. Nature, 303: 142–146
Edwards C, Menzies M, Thirlwall M. 1991. Evidence from Muriah, Indonesia, for the interplay of supra-subduction zone and intraplate processes in the geneis of potassic magmas. J Petrol, 32: 555–592
Glazner A F, Farmer G L. 1992. Production of isotopic variability in continental basalts by cryptic crustal contamination. Science, 255: 72–74
Hamelin B, Dupre B, Alleger C J. 1986. Pb-Sr-Nd isotopic data of Indian ocean ridge: New evidence of large-scale mapping of mantle heterogeneities. Earth Planet Sci Lett, 76: 288–298
Hart S R. 1984. A large-scale isotope anomaly in the southern hemisphere mantle. Nature, 309: 753–757
Hart S R. 1988. Heterogeneous mantle domains: Signatures, genesis and mixing chronologies. Earth Planet Sci Lett, 90: 273–296
He Z H, Wang T W, Li C, et al. 2000. The new understanding of the Amugang Group of Qiangtang terrain in north Tibet (in Chinese). World Geol, 19: 1–7
Hoskin P W O, Black L P. 2000. Metamorphic zircon formation by solid-state recrystallization of protolith igneous zircon. J Metamorph Geol, 18: 423–439
Hou Q Y, Zhao, Z D, Zhang H F, et al. 2006. Indian Ocean-MORB-type isotopic significance of the Yushigou ophiolite in North Qilian Mountains and its implications. Sci in China Ser D-Earth Sci, 49: 561–572
Hsü K J, Pan G T, Sengor A M C, et al. 1995. Tectonic evolution of the Tibetan Plateau: A working hypothesis based on the archipelago model of orogenesis. Int Geol Rev, 37: 473–508
Huang J J. 2001a. Structural characteristics of the basement of Qiangtang basin (in Chinese). Acta Geol Sin, 75: 333–337
Huang J J. 2001b. Tectonic characteristics and evolution of the Qiangtang basin (in Chinese). Reg Geol Chin, 20: 178–186
Huang J J, Yi H S, Lin J H. 2003. Structural features of the Qiangtang basin and preliminary analysis on oil-gas potentials (in Chinese). Sci Geol Sin, 39: 1–10
Huang J Q, Chen G M, Chen B W, 1984. Preliminary analysis of the Tethys-Himalaya tectonic domain (in Chinese). Acta Geol Sin, 58: 1–17
Lai S C, Qin J F. Li X J, et al. 2010. Geochemistry and Sr-Nd-Pb isotopic features of the Ganlongtang-Nongba ophiolite from the Changning-Menglian suture zone (in Chinese). Acta Petro Sin, 26: 3195–3205
Langmuir C H, Bender J F, Bence A E, et al. 1997. Petrogenesis of basalts form the famous area; mid-Atlantic ridge. Earth Plane Sci Lett, 36: 133–156
Li C. 1987. Lungmuco-Shuanghu-Langcangjiang plate suture and the north boundary of distribution of Gondwana facies Permo-Carboniferous system in Northern Xizang, China (in Chinese). J Changchun College Geosci, 17: 155–166
Li C, Cheng L R, Hu K, et al. 1995. Study on Paleo-Tethys Suture zone Longmu Co-Shuanghu, Tibet (in Chinese). Beijing: Geological Publishing House. 1–45
Li C, Wang T W, Yang D M, et al. 2000. Isotopic chronology of Duguer granitic gneiss of central Qiangtang, Tibet (in Chinese). J Changchun Univ Sci Tec, 30: 105–109
Li C, Wang T W, Yang D M, et al. 2001. The lithological composition and tectonic evolution of Qiangtang central uplift region, Tibet (in Chinese). J Changchun Univ Sci Tecn, 31: 25–31
Li C. 2003. Question about the basement of the Qiangtang Micro-plate (in Chinese). Geol Rev, 49: 5–9
Li C, Zhai Q G, Cheng L R, et al. 2005. Though on some key geological problems in the Qingtang area, Qinghai-Tibet Plateau (in Chinese). Earth Sci Front, 24: 295–301
Li C. 2006. The Longmu Co-Shuanghu Jitang plate suture and the northern boundary of Gondwana in the Qinghai-Tibetan Plateau (in Chinese). Earth Sci Front, 13: 136–147
Li C. 2008. A review on 20 years’ study of the Longmu Co-Shuanghu-Lancang river suture zone in Qinghai-Xizang (Tibet) Plateau (in Chinese). Geol Rev, 54: 136–147
Li Y J, Wu H R, Li H S, et al. 1997. Discovery of radiolarians in the Amugang and Chasang groups and Lugu formation in northern Tibet and some related geological problems (in Chinese). Geol Rev, 43: 250–256
Li Y T, Luo J N, Lu H N, et al. 2001. Stratigraphy of the Tibetan Plateau (in Chinese). Beijing: Geological Publishing House. 10-30
Lu B, Liu C Y, Liu Z, et al. 2001. Basement formation and structural features of the Qiangtang basin and their implications (in Chinese). Seis Geol, 23: 581–587
Lu Y F. 2004. Geokit-A geochemical toolkit for microsoft excel (in Chinese). Geochimica, 33: 459–464
Ludwig K R. 2003. User’s manual for ISOPLOT 3.00: A geochronological toolkit for Microsoft excel. Berkeley Geochron Center Spec Pub. 41–70
Mahoney J, Frei R, Tejadal M, et al. 1998. Tracing the Indian ocean mantle domain through time: Isotopic results from old west Indian, east Tethyan, and south Pacific seafloor. J Petrol, 39: 1285–1306
Mertz D F, Devey C W, Todt W, et al. 1991. Sr-Nd-Pb isotope evidence against plume-asthenosphere mixing north of Iceland. Earth Planet Sci Lett, 107: 243–255
Niu X L, Zhao Z D, Mo X X, et al. 2006. Elemental and Sr-Nd-Pb isotopic geochemistry for basic rocks from Decun-Angren ophiolites in Xigaze area, Tibet: Implications for the characteristics of the Tethyan upper mantle domain (in Chinese). Acta Petrol Sin, 22: 2875–2888
Pan G T, Chen Z L, Li X Z, et al. 1997. Formation and Evolution of the East Tethys Geotectonics (in Chinese). Beijing: Geological Publishing House. 121-128
Pan G T, Li X Z, Wang L Q, et al. 2002. Preliminary division of tectonic units of the Tibetan Plateau and its adjacent regions (in Chinese). Geol Bull China, 21: 701–707
Pan G T, Wang L Q, Zhu D C, et al. 2004a. Thoughts on some important scientific problems in regional geological survey of the Qinghai-Tibet Plateau (in Chinese). Geol Bull China, 23: 12–19
Pan G T, Zhu D C, Wang L Q, et al. 2004b. Bangong Lake-Nu river suture zone the northern boundary of Gondwanaland: Evidence from geology and geophysics (in Chinese). Earth Sci Front, 11: 371–382
Pearce J A, Peate D W. 1995. Tectonic implications of the composition of volcanic arc magmas. Annu Rev Earth Planet Sci, 23: 1073–1109
Qian D Y.1994. The biota climate of Carboniferous and Permian in Xizang (Tibet) and its significance for discussion on the northern boundary of Gondwana (in Chinese). Tibet Geol, 18: 26–42
Rollinson H R. 1993. Using Geochemical Data: Evaluation, Presentation, Interpretation. London: Longman Group UK Ltd. 352
Song B, Zhang Y H, Wang Y S, et al. 2002. Mount making and procedure of the SHRIMP dating (in Chinese). Geol Rev, 48(Suppl): 26–30
Sun S S, McDonough W F. 1989. Chemical and isotopic systematics of oceanic basalt: Implications for mantle composition and processes. In: Saunders A D, Norry M J, eds. Magmatism in the Ocean Basins. London: J Geol Soc Spec Publ, 42: 313–345
Tan F W, Wan J, Fu X G, et al. 2009. U-Pb Zircon SHRIMP age of metamorphic rocks from the basement of the Qiangtang basin, northern Tibet, and its Geological significance (in Chinese). Acta Petrol Sin, 25: 139–146
Wang C S, Hu C Z, Wu R. Z, et al. 1987. Significance of the discovery of Chasang-Chabu rift in northern Xizang (Tibet) (in Chinese). J Chengdu College Geol, 14: 33–45
Wang G Z, Wang C S. 2001. Disintegration and age of basement metamorphic rocks in Qiangtang, Tibet, China. Sci China Ser D-Earth Sci, 44(Suppl): 86–93
Wang J, Tan F W, Li Y L, et al. 2004. The Potential of the Oil and Gas Resources in Major Sedimentary Basins on the Tibetan Plateau (in Chinese). Beijing: Geological Publishing House. 1–65
Wang L Q, Pan G T, Zhu D C, et al. 2006. 40Ar/39Ar ages of the metamorphic rocks and basalts in Erou area of Shuanghu, northern Xizang and and their significance (in Chinese). Earth Sci Front, 13: 221–231
Wang L Q, Pan G T, Li C, et al. 2008. SHRIMP U-Pb zircon dating of the Eopaleozoic cumulate in Guoganjianian Mt. from central Qiangtang area of northern Tibet-Considering the evolvement of Proto- and Paleo-Tethys (in Chinese). Geol Bull China, 27: 2045–2056
Wei Q R, Shen S Y, Mo X X, et al. 2003. Recognition and significance of DUPAL isotope anomaly in the middle part of Sanjian area (in Chinese). Geol Geochem, 31: 36–41
Weis D, Frey F. 1996. Role of the Kerguelen plume in generating the eastern Indian ocean seafloor. J Geophys Res, 101: 13841–13849
Williams I S, Clasesson S. 1987. Isotope evidence for the Precambrian province and Caledonian metamorphism of high grade paragneiss form the Seve Nappers, Scandinavian Caledonides. II. Ion microprobe zircon U-Th-Pb. Contrib Mineral Petrol, 97: 205–217
Winchester J A, Floyd P A. 1977. Geochemical discrimination of different magma series and their differentiation products using immobile elements. Chem Geol, 20: 325–343
Wu R Z, Hu C Z, Wang C S, et al. 1986. The stratigraphical system of Qingtang district in Northern Xizang (Tibet). In: Contribution to the Geology of the Qinghai-Xizang (Tibet) Plateau (in Chinese). Beijing: Gelogical Publishing House. 9: 1–32
Xing G F, Shen W Z, Wang D Z, et al. 1997. Sr-Nd-Pb isotopic compose and source features of Mesozoic to Cenozoic magmatic rocks on King George island, Antarctica (in Chinese). Acta Petrol Sin, 13: 473–487
Xu J F, Castillo P R. 2004. Geochemical and Nd-Pb isotopic characteristics of the Tethyan asthenosphere: Implications for the origin of the Indian Ocean mantle domain. Tectonophysics, 393: 9–27
Xu J F, Castillo P R, Li X H, et al. 2002. MORB-type rocks from the Paleo-Tethyan Mian-Lueyang northern ophiolite in the Qinling Mountains, central Chian: Implications for the source of the low 206Pb/204Pb and high 143Nd/144Nd mantle component in the Indian Ocean. Earth Planet Sci Lett, 198: 323–337
Xu J F, Han Y W. 1996. High radiogenic Pb-isotope composition of ancient MORB-type rocks from Qinlin area-Evidence for the presence of Tethyan-type oceanic mantle. Sci China Ser D-Earth Sci, 39(Suppl): 33–42
Yin J X. 1997. Stratigraphic Geology of Gondwana Facies of Qinghai-Xizang (Tibet) Plateau and Adjacent (in Chinese). Beijing: Geological Publishing House. 1–121
Yuan S C, Yu G M, Tian Q N. 2007. Gravity and magnetic anomalies profiles and characteristics of basement structure in the Qiangtang basin, Qinghai-Tibet Plateau (in Chinese). Geol Bull China, 26: 703–709
Zhai Q G, Li C, Huang X P. 2007. The fragment of Paleo-Tethys ophiolite from central Qingtang, Tibet: Geochemical evidence of metabasites in Guogangjianian. Sci China Ser D-Earth Sci, 50: 1302–1309
Zhai Q G, Wang J, Li C, et al. 2010. SHRIMP U-Pb dating and Hf isotopic analyses of Middle Ordovician meta-cumulate gabbro in central Qiangtang, northern Tibetan Plateau. Sci China Earth Sci, 53: 657–664
Zhang Q, Zhou D J, Li X Y, et al. 1995. Characteristics and genesis of Shuanggou ophiolites, Yunnan Province, China (in Chinese). Acta Petrol Sin, 11(Suppl): 190–202
Zhang S Q, Mahoney J J, Mo X X, et al. 2005. Evidence for a widespread Tethyan upper mantle with Indian-ocean-type isotopic characteristics. J Petrol, 46: 1–30
Zhou S, Mo X X, Mahoney J J, et al. 2002. Geochronology and Nd and Pb isotope characteristics of gabbro dikes in the Luobusha ophiolite, Tibet. Chin Sci Bull, 47: 143–147
Zhu D C, Zhao Z D, Niu Y L, et al. 2013. The origin and pre-Cenozoic evolution of the Tibetan Plateau. Gondwana Res, 23: 1429–1454
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Peng, Z., Geng, Q., Pan, G. et al. Zircon SHRIMP geochronology and Nd-Pb isotopic characteristics of the meta-basalt in the central part of Tibetan Plateau’s Qiangtang region. Sci. China Earth Sci. 57, 428–438 (2014). https://doi.org/10.1007/s11430-013-4693-3
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11430-013-4693-3