Abstract
Adakites and Nb-enriched arc basaltic rocks (NEABs) are identified to occur within the Carboniferous arc volcanic sequence in the Alataw Mountains, Xinjiang. The adakites, which consist of calc-alkaline dacites and rhyolites, are characterized by strong depletion of heavy rare earth elements (HREEs) (e.g., Yb) and Y, high Sr contents and Sr/Y ratios, either with no Eu anomalies or obvious positive Eu anomalies, apparent positive Sr anomalies, and depleted Nb and Ti. The Alataw adakites are very geochemically similar to the adakites that were presumably derived from partial melting of subducting oceanic crust. The rhyolitic adakite in the Alataw Mountains shows low MgO contents of 0.35% and Mg# values of about 17. However, the dacitic adakite shows high MgO contents of 2.67% to 3.32% and Mg# values of 53 to 58, suggesting that the adakite was possibly contaminated by mantle peridotite. On the other hand, the NEABs are characterized by Na-rich (Na2O/K2O > 2.0), high P2O5 and TiO2 contents, positive to weakly negative Nb anomalies, and non-negative Ti anomalies, suggesting that the NEABs were probably derived from partial melting of mantle peridotite that interacted with slab melt under high geothermal gradient. The Alataw adakites were probably derived from partial melting of oceanic crust on the southern margin of the Junggar plate that was subducted beneath the Bole block in the Carboniferous. The Alataw adakites-NEABs association implies that the partial melting of the subducting oceanic crust and the succedent interactions between the slab melt and peridotite in the mantle wedge possibly took place under the Bole arc in Carboniferous. On the southern margin of the Junggar plate, the Carboniferous subduction of oceanic crust (basin) was possibly extensive in the late Paleozoic era. In the Alataw area, high geothermal gradient possibly occurred in Carboniferous, and partial melting of subducting oceanic crust was a probable mechanism of Carboniferous regional crust growth.
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References
Defant, M. J., Drummond, M. S., Derivation of some modern arc magmas by melting of young subducted lithosphere, Nature, 1990, 347: 662–665.
Defant, M. J., Jackson, T. E., Drummond, M. S. et al., The geochemistry of young volcanism throughout western Panama and southeastern Costa Rica: an overview, J. Geol. Soc. (London), 1992, 149: 569–579.
Defant, M. J., Xu, J. F., Kepezhinskas, P. et al., Adakite: some variations on a theme, Acta Petrologica Sinica, 2002, 18(2): 129–142.
Sajona, F. G., Maury, R. C., Bellon, H. et al., Initiation of subduction and the generation of slab melts in western and eastern Mindanao, Philippines, Geology, 1993, 21: 1007–1010.
Sajona, F. G., Maury, R. G., Bellon, H. et al., High Field Strength element enrichment of Pliocene-Pleistocene island arc basalts, Zamboanga Peninsula, Western Mindanao (Philippines), Journal of Petrology, 1996, 37: 6693–726.
Hollings, P., Kerrich, R., An Archean arc basalt-Enriched-enriched basalt-adakite association: the 2.7 Ga confederation assemblage of the Birch-Uchi greenstone belt, Superior Province, Contributions to Mineralogy and Petrology, 2000, 139: 208–226.
Polt, A., Kerrich, R., Magnesian andesites, Enriched-enriched basalt-andesites, and adakite from late-Archean 2.7 Ga Wawa greenstone belts, Superior Province, Canada: implications for Late Archean subduction zone petrogenetic processes, Contrib. Mineral Petrol., 2001, 141: 36–52.
Aguillon-Robles, A., Caimus, T., Bellon, H. et al., Late Miocene adakite and Nb-enriched basalts from Vizcaino Peninsula, Mexico: indicators of East Pacific Rise subduction below southern Baja California, Geology, 2001, 29: 531–534.
Kepezhinskas, P. K., Defant, M. J., Drummond, M. S., Progressive enrichment of island arc mantle by melt-peridotite interaction inferred from Kamchatka xenoliths, Geochim. Cosmochim. Acta, 1996, 60: 1217–1229.
Gill, J. B., Orogenic andesite and Plate tectonics, Berlin: Springer, 1981, 1–100.
Wang, Q., Xu, J. F., Wang, J. X. et al., The recognization of adakite-type gneisses in the North Dabie Mountains and its implication to ultrahigh pressure metamorphic geology, Chinese Science Bulletin, 2000, 45(21): 1927–1933.
Xu, J. F., Wang, Q., Yu, X. Y., Geochemistry of high-Mg Andesite and Adakitic andesite from the Sanchazi block of the Mian-Lue ophiolitic melange in the Qinling Mountains, central China: Evidence of partial melting of the subducted Paleo-Tethyan crust and its implication, Geochemical Journal, 2000, 34: 359–377.
Xu, J. F., Mei, H. J., Yu, X. Y. et al., Adakite related to subduction in the northern margin of Junggar arc for the Late Paleozoic: Products of slab melting, Chinese Science Bulletin, 2001, 46(15): 1312–1316.
Zhang, Q., Wang, Y., Qian, Q. et al., The characteristics and tectonic-metallogenesis significances of the adakite in Yanshanian period from eastern China. Acta Petrologica Sinica (in Chinese with English abstract), 2001, 17(2): 236–244.
Zhang, Q., Qian, Q., Wang, E. Q. et al., An east China Plateau in mid-ate Yanshanian period: implication from adakite, Chinese Journal of Geology (in Chinese with English abstract), 2001, 36(2): 248–255.
Xiong, X. L., Zhao, Z. H., Bai, Z. H. et al., Adakite-type sodium-rich rocks in Awulale Mountain of West Tianshan: significance for the vertical growth of continental crust, Chinese Science Bulletin, 2001, 46(10): 811–816.
Xiao, X. C., Tang, Y. Q., Feng, Y. M. et al., The tectonics of the north Xinjiang and neighboring area (in Chinese with Eanglish abstract), Beijing: Geological Press, 1992, 1–169.
Sun, S. S., McDonough, W. F., Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and Processes, Mamgmatism in the Ocean Basins (eds. Saunders, A. D., Norry, M. J.), Geol. Soc. Special Publications, 1989, 42: 313–345.
Stern, C. R., Kilian, R., Role of the subducted slab, mantle wedge and continental crust in the generation of adakite from the Austral Volcanic Zone, Contrib. Miner. Petrol. 1996, 123: 263–281.
Chen, J. F., Zhou, T. X., Xie, Z. et al., Formation of positive εNd (T) granitoids from the Alataw Mountains, Xinjiang, China, by mixing and fractional crystallization: implication for Phanerozoic crustal growth, Tectonophysics, 2000, 328: 53–67.
Atherton, M. P., Petford, N., Generation of sodium-rich magmas from newly underplated basaltic crust, Nature, 1993, 362: 144–146.
Drummond, M. S., Defant, M. J., Kepezhinskas, P. K., The petrogenesis of slab derived trondhjemite-tonalite-dacite/adakite magmas, Trans. R. Soc. Edinburgh: Earth Sci, 1996, 87: 205–216.
Smithies, R. H., The Archean tonalite-trondhjemite-granodiorite (TTG) series is not an analogue of Cenozoic adakite, Earth and Planetary Science Letters, 2000, 182, 115–125.
Wang, Q., Zhao, Z. H., Xiong, X. L. et al., Crustal growth and the melting of mafic lower crust: evidence from the Shaxi adakitic sodic quartz diorite-porphyrites, in Anhui Province, China, Geochimica (in Chinese with English abstract), 2001, 30(3): 353–362.
Rapp, R. P., Shimizu, N., Norman, M. D. et al., Reaction between slab-derived melts and peridotite in the mantle wedge: experimental constraints at 3.8 Gpa, Chemical Geology, 1999, 160: 335–356.
Kepper, H., Constraints from partitioning experiments on the composition of subduction-zone fluids, Nature, 1996, 380: 237–240.
Martin, H., Adakitic magmas: modern analogues of Archean granitoids, Lithos, 1999, 46: 411–429.
Kepezhinskas, P. K., Defant, M. J., Drummond, M., Na metasomatism in the island-arc mantle by slab melt-peridotite interaction: evidence from mantle xenoliths in the north Kamchatka arc, Journal of Petrology, 1995, 36: 1505–1527.
Martin, H., Moyen, J. F., Secular changes in tonalite-trondhjemitegranodiorite composition as markers of the progressive cooling of earth, Geology, 2002, 30: 319–322.
Huang, J. Q., Jiang, C. F., Wang, Z. X., Plate tectonics and accordion-type movement, Xinjiang Geological Science (in Chinese), 1990, 1(1): 3–16.
He, G. Q., Li, M. S., Liu, D. Q. et al., Paleozoic evolution and metallogenesis in Xinjiang, China (in Chinese with English abstract). Urumuqi: Xinjiang People Press, 1994, 1–437.
Gao, J., He, G. Q., Li, M. S., Paleozoic orogenic processes of Xitianshan orogenic belt, Earth Science (in Chinese with English abstract), 1997, 22(1): 27–32.
Coleman, R. G., Continental growth of Northwest China, Tectonics, 1989, 8: 621–635.
Sengör, A. M. C., Natal’in, B. A., Burtman, V. S., Evolution of the Altaid tectonic collage and Paleozoic crustal growth in Eurasia, Nature, 1993, 364: 299–307.
Han, B. F., Wang, S. G., Jahn, B. M. et al., Depleted-mantle magma source for the Ulungur River A-type granites from north Xinjiang, China: geochemistry and Nd-Sr isotopic evidence, and implication for Phanerozoic crustal growth, Chem. Geol., 1997, 138: 135–159.
Jahn, B. M., Wu, F. Y., Chen, B., Massive granitoid generation in Central Asia: Nd isotope evidence and implication for continental growth in the Phanerozoic, Epidodes, 2000, 23: 82–92.
Wu, F. Y., Jahn, B. M., Wilde, S. et al., Phanerozoic crustal growth: Sr-Nd isotopic evidence from the granites in northeastern China, Tectonophysics, 2000, 328: 89–113.
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Wang, Q., Zhao, Z., Bai, Z. et al. Carboniferous adakites and Nb-enriched arc basaltic rocks association in the Alataw Mountains, north Xinjiang: interactions between slab melt and mantle peridotite and implications for crustal growth. Chin.Sci.Bull. 48, 2108–2115 (2003). https://doi.org/10.1007/BF03037015
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DOI: https://doi.org/10.1007/BF03037015