1887

Abstract

Summary

Qin—Hang metallogenic belt are famous tectonic units and important rich mineral resources in south China. Due to few geophysical data, there was previously lack of comprehensive geophysical research in this area. In this paper, based on priori geological information and exploration data, regional structures are divided and volcanic rocks are delineated, even the deep dynamic process and mineralization mechanism have been speculated from gravity and magnetic data inversion. The boundary between Cathaysia plate and the Yangtze plate, and five geological blocks, even major fractures can be identified, which is the main channel of magma upwelling. Some deep and large faults control magmatic activity, and those secondary faults control regional mineralization. Negative gravity anomaly can be used as a basis for searching magmatic rocks. Here abundant basic - ultrabasic magma in 220~250 Ma period, is the result of lithosphere stretching, thinning and mantle upwelling. It is a vital metallogenic mechanism in the belt that ancient subduction zone after modification or superimposed mineralization in yanshan epoch. Further, the “proterozoic + Mesozoic” bimodal age phenomenon of porphyry and its associated ore deposits in this region can be confirmed.

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/content/papers/10.3997/2214-4609.201902462
2019-09-08
2024-04-24
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References

  1. Farquharson, C.G.
    , 2008. Constructing piecewise-constant models in multi-dimensional minimum-structure inversions. Geophysics, 73, K1–K9.
    [Google Scholar]
  2. Farquharson, C.G., M.R.Ash and H.G.Miller
    , 2008. Geologically constrained gravity inversion for the Voisey’s Bay Ovoid deposit. The Leading Edge, 27(1), 64–69.
    [Google Scholar]
  3. Farquharson, C.G., and C.R.W.Mosher
    , 2009. Three-dimensional modelling of gravity data using finite dierences. Journal of Applied Geophysics, 68, 417–422.
    [Google Scholar]
  4. Lelièvre, P.G., Farquharson, C.G., and Hurich, C.A.
    , 2012. Joint inversion of seismic traveltimes and gravity data on unstructured grids with application to mineral exploration. Geophysics, 77(1), K1–K15.
    [Google Scholar]
  5. Lelièvre, P.G., and Farquharson, C.G.
    , 2013. Gradient and smoothness regularization operators for geophysical inversion on unstructured meshes. Geophysical Journal International, 195, 330–341.
    [Google Scholar]
  6. Li, Y.G., and Oldenburg, D.W.
    , 1998. 3D inversion of gravity data. Geophysics, 63, 109–119.
    [Google Scholar]
  7. LüQ.T., LiuZ.D., YanJ.Y., TangJ.T., WuM.A. , and XiaoX.
    , 2015. Crustal-scale structure and deformation of Lu-Zong ore district: Joint interpretation from integrated geophysical data. Interpretation, 3(2), SL39–SL61.
    [Google Scholar]
  8. Oldenburg, D.W., and PrattD.A.
    , 2007. Geophysical inversion for mineral exploration: A decade of progress in theory and practice. In Milkereit, B., ed., Proceedings of Exploration Fifth Decennial International Conference on Mineral Exploration, 61–95.
    [Google Scholar]
  9. Yang, M.G., HuangS.B., Lou, F.S., Tang, W.X., and Mao, S.B.
    , 2009. Lithospheric structure and large-scale metallogenic process in Southeast China continental area. Geology in China, 36(3), 528–543 (in Chinese with English abstract).
    [Google Scholar]
  10. Zhang, Y.Q., XuX.B., Jia, D., and ShuL.S.
    , 2009. Deformation record of the change from Indosinian collision JI related tectonic system to Yanshanian subduction related tectonic system in South China during the Early Mesozoic. Earth Science Frontiers, 16(1), 234–247 (in Chinese with English abstract).
    [Google Scholar]
  11. Zhou, Y.Z., Zeng, C.Y, Li, H.Z, and AnY.F., Liang, J., Lü W.C., Yang, Z.J., He, J.G., and Shen, W.J.
    , 2012. Geological evolution and ore-prospecting targets in southern segment of Qinzhou Bay-Hangzhou Bay juncture orogenic belt, southern China. Geological Bulletin of China, 31(2-3), 486–491 (in Chinese with English abstract).
    [Google Scholar]
  12. Welford, K.J., and Hall, J.
    , 2007. Crustal structure of the Newfoundland rifted continental margin from constrained 3-D gravity inversion. Geophysical Journal International, 171(2), 890–908.
    [Google Scholar]
  13. Williams, N.C., Lane, R., and Lyons, P.
    , 2004. Regional constrained 3D inversion of potential field data from the Olympic Cu-Au province, south Australia. Preview, 109, 30–33.
    [Google Scholar]
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