Abstract
The existence and subduction of the eastern Mianlüe oceanic basin in the south Qinling belt are keys to understand the Qinling orogen. Based on geological mapping, several volcanic slices have been identified in Tumen, Zhoujiawan, Xiaofu and Yuantan areas, which distribute in the northern margin of the Dahong Mountains (DHM), and thrust into the Sanligang-Sanyang fault. These slices consist mainly of diabases, basaltic-andesitic lavas, pyroclastic rocks and a minor tuff. The geochemistry of the basalts, andesites, and diabases is characterized by depleting in Nb and Ta, enriching in Th and LILE (e.g.K, Rb, Ba), and undifferentiating in HFSE. These geochemical characteristics suggest that the original magma of these rocks was derived from a mantle wedge above a subduction zone, and formed in an island-arc setting in Carboniferous-early Triassic. Comparing with the ophiolites and island-arc volcanic rocks in Mianxian-Lüeyang area to the west, it is reasonable to consider that there had been an oceanic basin connecting with the Mianlüe ancient ocean to the westward, distributing along the south edge of the Tongbai-Dabie block. In view of the ophiolite in Huashan area and these island-arc volcanic rocks along the north of the Dahong Mountains, it is suggested that there had been a plate tectonic evolutionary history with oceanic basin rifting and subduction in this region.
References
Zhang, G. W., Meng, Q. R., Yu, Z. P. et al., Orogenesis and dynamics of the Qinling Orogen, Science in China, Ser. D, 1996, 39(3): 225–234.
Li, S. G., Sun, W. D., Zhang, G. W. et al., Chronology and geochemistry of metavolcanic rocks from Heigouxia valley in the Mianlüe tectonic zone South Qinling: Evidence for a Paleozoic oceanic basin and its close time, Science in China, Ser. D, 1996, 39(3): 300–310.
Xu, J. F., Han, Y. W., High radiogenic Pb-isotope composition of ancient MORB-type rocks from Qinling area: Evidence for the presence of Tethyan-type oceanic mantle, Science in China, Ser. D, 1996, 39(supp.): 33–42.
Feng, Q. L., Du, Y. S., Yin, H. F. et al., Carboniferous radiolaria fauna firstly discovered in Mianlüe ophiolitic mélange belt of south Qinling Mountains, Science in China, Ser. D, 1996, 39(supp.): 87–92.
Lai, S. C., Zhang, G. W., Yang, Y. C. et al., Petrology and geochemistry features of the metamorphic volcanic rocks in Mianxian-Lüeyang suture zone, south Qinling, Acta Petrologica Sinica (in Chinese), 1997, 13(4): 563–573.
Chen, L., Sun, Y., Liu, X. M. et al., Geochemistry of Derni ophiolite, Qinhai Province, and its tectonic significance, Acta Petrologica Sinica (in Chinese), 2000, 16(1): 106–110.
Chen, L., Sun, Y., Pei, X. Z. et al., Northernmost Paleo-Tethyan oeanic basin in Tibet: Geochronological evidence from 40Ar/39Ar age dating of Dur’ngoi ophiolite, Chinese Science Bulletin, 2001, 46(14): 1203–1206. [Abstract] [PDF]
Dong, Y. P., Zhang, G. W., Lai, S. C. et al., An ophiolitic tectonic mélange first discovered in Huanshan area, south margin of Qinling Orogenic Belt, and its tectonic implications, Science in China, Ser. D, 1999, 42(3): 292–302.
Coleman, R. G., The diversity of ophiolites, Geol mijinbouw, 1984, 63: 141–150.
Zhang, Q., Some problems concerning the ophiolite study, Acta Petrologica Sinica (in Chinese), 1995, 11(supp.): 228–240.
Dong, Y. P., Zhang, G. W., Liu, X. M. et al., Disintegration of the Huashan Group in the Dahong Mountain area, northern Hubei, Regional Geology of China (in Chinese), 1998, 17(4): 371–376.
Hart, S. R., Erlank, A. J., Kable, E. J. D., Sea floor basalt alteration: Some chemical and strontium isotopic effects, Contrib. Mineral. Petrol., 1974, 44: 219–230.
Mitchell, W. S., Aumento, F., Uranium in oceanic rock: Deep sea drilling project leg37, Can. J. Earth Sci., 1977, 4: 794–808.
Condie, K. C., Geochemical changes in basalts and andesites across the Archaean-Proterozoic boundary: Identification and significance, Lithos, 1989, 23: 1–18. [DOI]
Wilson, M., Igneous Petrogenesis, London: Unwin Hyman, 1989, 1–466.
Pearce, J. A., Trace element characteristics of lavas from destructive plate boundaries, Andesitesm, in Orogenic Andesites and Related Rocks (ed. Thorpe, R. S.), Chichester: John Wiley & Sons, 1982, 525–548.
Green, T. H., Island arc and continent-building magmatism: A review of petrogenetic models based on experimental petrology and geochemistry, Tectonophysics, 1980, 63: 367–385. [DOI]
Saunders, A. D., Terney, J, Marsh, N. G. et al., Ophiolites as ocean crust of marginal basin crust: A geochemical approach, in Proc. Int. Ophiolite Conf. (ed. Panayiotou, A.), Cyprus: Nicosia, 1980, 193–204.
Meschede, M., A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with the Nb-Zr-Y diagram, Chem. Geol., 1986, 56: 207–218. [DOI]
Wood, D. A., The application of a Th-Hf-Ta diagram to problems of tectonomagmatic classification and to establishing the nature of crustal contamination of basaltic lavas of the British Tertiary volcanic province, Earth Planet. Sci. Lett., 1980, 50: 11–30. [DOI]
Li, S. G., The Ba-Th-Nb-La diagrams for the discrimination of ophiolitic tectonic settings, Acta Petrologica Sinica (in Chinse), 1993, 9(2): 146–157.
Pearce, J. A., The role of sub-continental lithosphere in magma genesis at destructive plate margin, in Continental Basalts and Mantle Xenoliths (eds. Hawkesworth, C. J., Norry, M. J.), Nantwish: Shiva, 1983, 230–249.
Cox, K. G., The Karoo province of southern Africa: Origin of trace element enrichment patterns, in Continental Basalts and Mantle Xenoliths (eds. Hawkesworth, C. J., Norry, M. J.), Nantwish: Shiva, 1983, 139–157.
Bellieni, G., Brotzu, P., Comin-Chiaramonti, P. et al., Flood basalt to rhyolite suites in southern Parana Plateau (Brazil): Palaeomagnetism, petrogenesis and geodynamic implications, J. Petrol., 1984, 25: 579–618.
Mantovani, M. S. M., Marques, L. S., DeSousa, M. A. et al., Trace element and strontium isotope constraints on the origin and evolution of Parana continental flood basalts of Santa Catarina State (South Brazil), J. Petrol., 1985, 26: 187–209.
Dong, Y. P., Late Triassic-Middle Jurassic strata and their sedimentary environments in Jingzhou area, Hubei, Journal of Stratigraphy (in Chinese), 1997, 21(2): 130–135.
Liu, G. L., Wang, X. W., Lu, X. M., Dahongshan Lamperoites (in Chinese), Beijing: Geological Publishing House, 1993,1–186.
Meng, Q. R., Zhang, G. W., Yu, Z. P. et al., Late Paleozoic sedimentation and tectonics of rift and limited ocean basin at southern margin of the Qinling, Science in China, Ser. D, 1996, 39(supp.): 24–32.
Li, J. Y., Wang, Z. Q., Zhao, M., 40Ar/39Ar thermochronological constraints on the timing of collisional orogeny in the Mianlüe collision belt, southern Qinling Mountains, Acta Geologica Sinica (in Chinese), 1999, 73(2): 208–215.
Sun, W. D., Li, S. G., Chen, Y. D. et al., Zircon U-Pb dating of granitoids from South Qinling, central China and their geological significance, Geochemica (in Chinese), 2000, 29(3): 209–216.
Wang, Z. Q., Chen, H. H., Li, J. L. et al., Discovery of the radiolariae fossils in the Xixiang group, the southern Qinling, central China, and its implications, Science in China, Ser. D, 1999, 42(4): 337–343.
Lai, S. C., Zhang, G. W., Yang, R. Y., Identification of the island-arc magmatic zone in the Lianghe-Raofeng-Wuliba area, south Qinling and its tectonic significance, Science in China, Ser. D, 2000, 43(supp.): 69–81.
Zhang, C. L., Gao, S., Zhang, G. W. et al., Geochemistry of the early Paleozoic alkaline dyke swarms in south Qinling, and its geological significance, Science in China, Ser. D, 2003, 46(12): 1292–1306. [Abstract] [PDF]
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Dong, Y., Zhang, G., Zhao, X. et al. Geochemistry of the subduction-related magmatic rocks in the Dahong Mountains, northern Hubei Province. Sci. China Ser. D-Earth Sci. 47, 366–377 (2004). https://doi.org/10.1360/02yd0486
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1360/02yd0486