Science in China Series D: Earth Sciences

, Volume 50, Issue 7, pp 984–994 | Cite as

Geochemistry and Sr-Nd-Pb isotopic characteristics of the Mugouriwang Cenozoic volcanic rocks from Tibetan Plateau: Constraints on mantle source of the underplated basic magma

  • Lai ShaoCong Email author
  • Qin JiangFeng 
  • Li YongFei 
  • Long Ping 


The Mugouriwang Cenozoic volcanic rocks exposed in the north Qiangtang Block of Tibetan Plateau are mainly composed of basalt and andesitic-basalt, both characterized by the lower SiO2 (51%–54%), high refractory elements (i.e. Mg, Cr, Ni) as well as the moderate enrichment in light rare earth elements (LREE) relative to a slight depleted in Eu and high strength field elements (HFSE, i.e. Nb, Ta, Ti). Besides, the fairly low Sm/Yb value (3.07–4.35) could signify that the rocks should be derived directly from partial melting of the spinel lherzolite at the upper part of the asthenosphere. These rocks have radiogenic Sr and Pb (87Sr/86Sr = 0.705339 to 0.705667; 208Pb/204Pb = 38.8192 to 38.8937; 207Pb/204Pb = 15.6093 to 15.6245; 206Pb/204Pb = 18.6246 to 18.6383), and non-radiogenic Nd (143Nd/144Nd = 0.512604 to 0.512639; Nd = +0.02 to −0.66) in agreement with those values of the BSE mantle reservoir. The DUPAL anomaly of the rocks can be evidently attested by the Δ8/4Pb = 66.82 to 74.53, Δ7/4Pb = 9.88 to 11.42, ΔSr>50, implying that the Mugouriwang volcanic rock is likely to be generated by partial melting of a Gondwana-bearing asthenospheric mantle ever matasomatised by the fluid from subduction zone. Depending on the previous study on the high-K calc-alkaline intermediate-felsic volcanics in the study area, this paper proposed that the fluids derived from the subducted Lhasa Block metasomatised the asthenosphere beneath the Qiangtang Block, and induced its partial melting, and then the melt underplated the thickened Qiangtang lithosphere and caused the generation of the Cenozoic adakite-like felsic magmas in the Qiangtang region.


geochemistry Sr-Nd-Pb isotopic composition mantle source region Cenozoic volcanic rocks Tibetan Plateau 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Deng W M. Cenozoic Intra-plate Volcanic Rocks in the Northern Qinghai-Xizang Plateau (in Chinese with English abstract). Beijing: Geological Publishing House, 1998. 1–168Google Scholar
  2. 2.
    Deng W M. Cenozoic volcanic activity and its geotectonic background in West China—Formative excitation mechanism of volcanic rocks in Qinghai-Xizang and adjacent area. Earth Sci Front (in Chinese with English abstract), 2003, 10(2): 472–478Google Scholar
  3. 3.
    Yang J S, Wu C L, Shi R D, et al. Miocene and Paleistoncene shoshonitic volcanic rocks in the Jingyuhu area, north of the Qinghai-Tibet Plateau. Acta Petrol Sin (in Chinese with English abstract), 2002, 18(2): 161–176Google Scholar
  4. 4.
    Shi L C, Guo T Z, Yang Y X, et al. Isotopic geochemistry and volcanic genesis and magmatic origin of the Cenozoic volcanic rocks in Hoh Xil Lake area. Northwest Geology, 2004, 37(1): 19–25Google Scholar
  5. 5.
    Ding L, Kapp P, Zhong D L, et al. Cenozoic volcanism in Tibet: evidence for a transition from oceanic to continental subduction. J Petrol, 2003, 44: 1833–1865CrossRefGoogle Scholar
  6. 6.
    Turner S, Arnaud N, Liu J Q, et al. Post-collision, shoshonitic volcanism on the Tibetan Plateau: implications for convective thinning of the lithosphere and the source of ocean island basalts. J Petrol, 1996, 37(1): 45–71CrossRefGoogle Scholar
  7. 7.
    Miller C, Schuster R, Klotzli U, et al. Post-collision potassic and ultrapotassic magmatism in SW Tibet: geochemical and Sr, Nd, Pb, O isotopic constraints for mantle source characteristics and petrogenesis. J Petrol, 1999, 40: 1399–1424CrossRefGoogle Scholar
  8. 8.
    Chung S L, Liu D Y, Ji J Q, et al. Adakites from continental collision zones: Melting of thickened lower crust beneath southern Tibet. Geology, 2003, 31: 1021–1024CrossRefGoogle Scholar
  9. 9.
    Lai S C. Identification of the Cenozoic adakitic rock association from Tibetan Plateau and its tectonic significance. Earth Sci Front (in Chinese with English abstract), 2003, 10(4): 407–415Google Scholar
  10. 10.
    Lai S C, Liu C Y, O’Reilly S Y. Petrogenesis and its significance to continental dynamics of the Neogene high-potassium calc-alkaline volcanic rock association from north Qiangtang, Tibetan Plateau. Sci China Ser D-Earth Sci, 2001, 44(supp.): 45–55CrossRefGoogle Scholar
  11. 11.
    Lai S C, Liu C Y, Yi H S, et al. Geochemistry and petrogenesis of Cenozoic andesite-dacite association from the Hoh Xil region, Tibetan Plateau. Int Geol Rev, 2003, 45: 998–1019Google Scholar
  12. 12.
    Xu J F, Wang Q. Tracing the thickening process of continental crust through studying adakitic rocks: evidence from volcanic rocks in the north Tibet. Earth Sci Front (in Chinese with English abstract), 2003, 10(4): 401–406Google Scholar
  13. 13.
    Liu S, Hu R Z, Feng C X, et al. Cenozoic adakite-type volcanic rocks in Qiangtang, Tibet and its significance. Acta Geol Sin-Engl Ed, 2003, 77(2): 187–194Google Scholar
  14. 14.
    Ding L, Zhang J J, Zhou Y, et al. Tectonic implication on the lithosphere evolution of the Tibet Plateau: Petrology and geochemistry of sodic and ultrapotassic volcanism in NorthernTibet. Acta Petrol Sin (in Chinese with English abstract), 1999, 15(3): 408–421Google Scholar
  15. 15.
    Chi X G, Li C, Jin W. Cenozoic volcanism and lithospheric tectonic evolution in Qiangtang area, northern Qinghai-Tibet Plateau. Sci China Ser D-Earth Sci, 2005, 35(7): 1011–1024CrossRefGoogle Scholar
  16. 16.
    Patino Douce A E, McCarthy T C. Melting of Crustal Rocks During Continental Collision and Subduction. Dordrecht: Kluwer Academic Publishers, 1998. 27–55Google Scholar
  17. 17.
    Yardley B W D, Valley J W. The petrologic case for a dry lower crust. J Geophys Res, 1997, 102: 12173–12185CrossRefGoogle Scholar
  18. 18.
    Stern C R, Kilian R. Role of the subducted slab, mantle wedge and continental crust In the generation of adakites from the Andean Austral volcanic zone. Contrib Mineral Petrol, 1996, 123: 263–281CrossRefGoogle Scholar
  19. 19.
    Sun S S, McDonough W F. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes, In: Saunders A D, Norry M J, eds. Magmatism in the Ocean Basin. Geol Soc Spec Publ, 1989, 42: 313–345Google Scholar
  20. 20.
    Wilson M. Igneous Petrogenesis. London: Unwin Hyman Press, 1989, 295–323Google Scholar
  21. 21.
    Lai S C. Petrogenesis of the Cenozoic volcanic rocks from the northern part of the Qinghai-Tibet Plateau, Acta Petrol Sin (in Chinese with English abstract), 1999, 15: 98–104Google Scholar
  22. 22.
    Wood D A, Joron J L, Treuil M, et al. Elemental and Sr isotope variations in basic lavas from Iceland and the surrounding sea floor. Contrib Mineral Petrol, 1979, 70: 319–339CrossRefGoogle Scholar
  23. 23.
    Hugh R R. Using Geochemical Data. Singapore: Longman Singapore Publishers, 1993, 234–240Google Scholar
  24. 24.
    Zindler A, Hart S R. Chemical geodynamics. Annu Rev Earth Planet Sci, 1986, 14: 493–573CrossRefGoogle Scholar
  25. 25.
    Wilson M. Geochemical signatures of oceanic and continental basalts: A key to mantle dynamics? J Geol Soc London, 1993, 150: 977–990Google Scholar
  26. 26.
    Hart S R. A large-scale isotope anomaly in the Southern Hemisphere mantle. Nature, 1984, 309: 753–757CrossRefGoogle Scholar
  27. 27.
    Mo X X, Zhao Z D, DePaolo D J, et al. Three types of collisional and post-collisional magmatism in the Lhasa block, Tibet and implications for India intra-continental subduction and mineralization: evidence from Sr-Nd isotopes. Acta Petrol Sin (in Chinese with English abstract), 2006, 22(4): 795–803Google Scholar
  28. 28.
    Hou Z Q, Gao Y F, Qu X M, et al. Origin of adakitic intrusive generated during mid-Miocene east-west extension in south Tibet. Earth Planet Sci Lett, 2004, 220: 139–155CrossRefGoogle Scholar
  29. 29.
    Gao Y F, Hou Z Q, Wei R H, et al. The geochemistry and Sr-Nd-Pb isotopes of basaltic subvolcanics from the Gangdese: Constraints on depleted mantle source for post-collisional volcanisms in the Tibetan Plateau. Acta Petrol Sin (in Chinese with English abstract), 2006, 22(3): 547–557Google Scholar
  30. 30.
    Gao Y F, Hou Z Q, Wei R H, et al. Post-collisional adakitic porphyries in Tibet: Geochemical and Sr-Nd-Pb isotopic constraints on partial melting of oceanic lithosphere and crust-mantle interaction. Acta Geol Sin, 2003, 77: 194–203Google Scholar
  31. 31.
    Tegner C, Lesher C E, Larsen L M, et al. Evidence from the rare-earth element record of mantle melting for cooling of the Tertiary Iceland plume. Nature, 1998, 395: 591–594CrossRefGoogle Scholar
  32. 32.
    Allegre C J, Minster J F. Quantitative method of trace element behavior in magmatic processes. Earth Planet Sci Lett, 1978, 38: 1–25CrossRefGoogle Scholar
  33. 33.
    Liu S, Hu R Z, Chi X G,et al. Geochemistry, series subdivision and petrogenetic interpretation of Cenozoic volcanic rocks in Northern Tibet. Geol J Chin Univ (in Chinese with English abstract), 2003, 9(2): 279–292Google Scholar
  34. 34.
    Lin J H, Yin H S, Shi Z Q, et al. Study on isotopic geochemistry of Cenezoic high-K calc-alkaline volcanic rocks in the Zuerkenwula Mountain area, Northern Tibet. J Mineral Petrol (in Chinese), 2004, 24(4): 59–64Google Scholar
  35. 35.
    Xu Z Q, Yang J S, Jiang M. Collision-orogen of the Northern Qinghai-Tibet Plateau and its deep dynamics. Acta Petrol Sin (in Chinese with English abstract), 2001, 22(1): 5–10Google Scholar
  36. 36.
    Hou Z Q, Zhao Z D, Gao Y F, et al. Tearing and dischronal subduction of the Indian continental slab: Evidence from Cenozoic Gangdese volcano-magmatic rocks in south Tibet. Acta Petrol Sin (in Chinese with English abstract), 2006, 22(4): 761–774Google Scholar
  37. 37.
    Mo X X, Zhao Z D, Deng J F, et al. Response of volcanism to the India-Asia collision. Earth Sci Front (in Chinese with English abstract), 2003, 10(3): 135–148Google Scholar
  38. 38.
    Pan G T, Mo X X, Hou Z Q, et al. Spatial-temporal framework of the Gangdese Orogenic Belt and its evolution. Acta Petrol Sin (in Chinese with English abstract), 2006, 22(3): 521–533Google Scholar

Copyright information

© Science in China Press 2007

Authors and Affiliations

  • Lai ShaoCong 
    • 1
    Email author
  • Qin JiangFeng 
    • 1
  • Li YongFei 
    • 1
  • Long Ping 
    • 1
  1. 1.State Key Laboratory of Continental Dynamics, Department of GeologyNorthwest UniversityXi’anChina

Personalised recommendations