Back
 GEP  Vol.3 No.5 , July 2015
Geochemistry and Tectonic Significance of Chlorite Amphibolite in Nanfen BIF, Benxi Area, Northeastern China
Abstract: Benxi area, Northeastern China, is the main distribution area of Archean BIF-hosted iron deposits in China. In this area, Nanfen iron deposit is well known as the largest open-pit iron deposit not only in China but also in Asia. So far, the tectonic nature during Archean BIF formation period in Benxi area has been long disputed and the tectonic setting of Nanfen BIF had not been found. In this study, the geochemical characters of chlorite amphibolites closely associated with BIF have been investigated for the tectonic environment of Nanfen BIF. Chlortie amphibolites show the geochemical affinity to the back-arc basin basalt (BABB), indicating that the tectonic environment of Nanfen BIF is the back-arc basin. In conjunction with geological evidence of other BIFs at Benxi area, it is identified that BIF in Benxi area might be formed in the subduction-related back-arc basin, which provides a favorable sedimentary environment of Algoma-type BIF.
Cite this paper: Wang, E. , Han, C. , Xia, J. , Yun, S. (2015) Geochemistry and Tectonic Significance of Chlorite Amphibolite in Nanfen BIF, Benxi Area, Northeastern China. Journal of Geoscience and Environment Protection, 3, 54-61. doi: 10.4236/gep.2015.35007.
References

[1]   Dai, Y.P., Zhang, L.C., Wang, C.L., Liu, L., Cui, M.L., Zhu, M.T. and Xiang, P. (2012) Genetic Type, Formation Age and Tectonic Setting of Waitoushan Banded Iron Formation, Benxi, Liaoning Province. Acta Petrologica Sinica, 28, 3574-3594.

[2]   Feng, J.R., Zhou, Z.H. and Xiao, R.G. (2009) The Protolith Restoration of the Second Diggings Wall Rock in Gongchangling Iron Ore, Liaoning Province. China Mining Magazine, 18, 106-110.

[3]   Liu, J. and Jin, S.Y. (2010) Geochemical Characteristics and Original Rock Restoration of Plagioclase Amphibolites in the Gongchangling Iron Deposit, Liaoning Province. Geology in China, 37, 324-333.

[4]   Cui, P.L., Sun, J.G., Zhang, P., Gu, A.L., Zhou, K.Q. and Sun, Q.L. (2012) Geochemical Study on BIF Wall Rock— Plagioclase Amphibolites of Cigou Formation in Anshan-Benxi Area. Mineral Deposits, 31, 93-94.

[5]   Zhang, P., Yang, H.Z., Zhou, Y. and Shi, J.M. (2013) Geochemical Characters and Geological Significance of Plagioclase Amphibolites from Anshan Group Cigou Formation, Anshan-Benxi Area. Geological Review, 59, 1217-1218.

[6]   Sun, X.H., Zhu, X.Q., Tang, H.S., Zhang, Q., Luo, T.Y. and Han, T. (2014) Protolith Reconstruction and Geochemical Study on the Wall Rocks of Anshan BIFs, Northeast China: Implications for the Provenance and Tectonic Setting. Journal of Geochemical Exploration, 136, 65-75. http://dx.doi.org/10.1016/j.gexplo.2013.10.009

[7]   Wang, E.D., Xia, J.M., Zhao, C.F., Fu, J.F. and Hou, G.Q. (2013) Material Sources and Sedimentary Environment of Gongchangling Iron Deposit. Mineral Deposits, 32, 380-396.

[8]   Bekker, A., Slack, J.F., Planavsky, N., Krapez, B., Hofmann, A., Konhauser, K.O. and Rouxel, O.J. (2010) Iron Formation: The Sedimentary Product of a Complex Interplay among Mantle, Tectonic, Oceanic and Biospheric Processes. Economic Geology, 105, 467-508. http://dx.doi.org/10.2113/gsecongeo.105.3.467

[9]   Gross, G.A. (1980) A Classification of Iron Formations Based on Depositional Environments. Canadian Mineralogist, 18, 215-222.

[10]   Zhai, M.G. and Santosh, M. (2011) The Early Precambrian Odyssey of North China Craton: A Synoptic Overview. Gondwana Research, 20, 6-25. http://dx.doi.org/10.1016/j.gr.2011.02.005

[11]   Zhou, S.T. (1994) The BIF Geology of Anshan—Benxi Area. Geological Publishing House, Beijing.

[12]   Wan, Y.S., Dong, C.Y., Xie, H.Q., Wang, S.J., Song, M.C., Xu, Z.Y., Wang, S.Y., Zhou, H.Y., Ma, M.Z. and Liu, D.Y. (2012) Formation Ages of Early Precambrian BIFs in the North China Craton: SHRIMP Zircon U-Pb Dating. Acta Geologica Sinica, 86, 1447-1478.

[13]   Zhang, A.M., Wang, Y.J., Fan, W.M., Zhang, Y.Z. and Yang, J. (2012) Earliest Neoproterozoic (ca. 1.0 Ga) Arc-Back- Arc Basin Nature along the Northern Yunkai Domain of the Cathaysia Block: Geochronological and Geochemical Evidence from the Metabasite. Precambrian Research, 220-221, 217-233. http://dx.doi.org/10.1016/j.precamres.2012.08.003

[14]   Middlemost, E.A.K. (1994) Naming Materials in the Mag-ma/Igneous Rock System. Earth Science Reviews, 37, 215- 224. http://dx.doi.org/10.1016/0012-8252(94)90029-9

[15]   Sun, S.S. and McDonough, W.F. (1989) Chemical and Iso-topic Systematics of Oceanic Basalts: Implications for Mantle Composition and Processes. In: Saunders, A.D. and Norry, M.J., Eds., Magmatism in Ocean Basins: Special Publication, Geological Society, London, 313-345. http://dx.doi.org/10.1144/gsl.sp.1989.042.01.19

[16]   Shinjo, R. (1998) Petrochemistry and Tectonic Significance of the Emerged Late Cenozic Basalts behind the Okinawa Trough Ryukyu Arc System. Journal of Volcanology and Geothermal Research, 80, 39-53. http://dx.doi.org/10.1016/S0377-0273(97)00042-5

[17]   Pearce, J.A. and Cann, J.R. (1973) Tectonic Setting of Basic Volcanic Rocks Determined Using Trace Element Analyses. Earth and Planetary Science Letters, 19, 290-300. http://dx.doi.org/10.1016/0012-821X(73)90129-5

[18]   Shuto, K., Ishimoto, H., Hirahara, Y., Sato, M., Matsui, K., Fujibayanshi, N., Takazawa, E., Yabuki, K., Sekine, M., Kato, M. and Rezanov, A.I. (2006) Geochemical Secular Variation of Magma Source during Early to Middle Miocene Time in the Niigata Area, NE Japen: Asthenosphere Mantle Upwelling during Back-Arc Basin Opening. Lithos, 86, 1-33. http://dx.doi.org/10.1016/j.lithos.2005.06.001

[19]   Cabanis, B. and Lecolle, M. (1989) Le diagramme La/10-Y/15-Nb/8: Un outil pour la discrimination des series volcaniques et lamise en evidence des processus demelange et/ou de contamination crustale. Compte Rendus de I’Académie des Sciences Series II, 309, 2023-2029.

[20]   Ghazi, J.M., Moazzen, M., Rahgoshay, M. and Moghadam, H.S. (2012) Geochemical Characteristics of Basaltic Rocks from the Nain Ophiolite (Central Iran); Constraints on Mantle Wedge Source Evolution in an Oceanic Back-Arc Basin and a Geodynamical Model. Tectonophysics, 574-575, 92-104. http://dx.doi.org/10.1016/j.tecto.2011.10.001

[21]   Xu, J.F., Castillo, P.R., Chen, F.R., Niu, H.C., Yu, X.Y. and Zhen, Z.P. (2003) Geochemistry of Late Paleozoic Mafic Igneous Rocks from the Kuerti Area, Xinjiang, Northwest China: Implications for Back-Arc Mantle Evolution. Chemical Geology, 193, 137-154. http://dx.doi.org/10.1016/S0009-2541(02)00265-6

[22]   Pearce, J.A. and Stern, R.J. (2006) Origin of Back-Arc Basin Magmas: Trace Element and Isotope Perspectives. In: Christie, D.M., Fisher, C.R., Lee, S.M. and Givens, S., Eds., Back-Arc Spreading Systems; Geological, Biological, Chemical, and Physical Interactions. Geophysical Monograph Series 166, American Geophysical Union, Washington, 63-86. http://dx.doi.org/10.1029/166gm06

[23]   Münker, C. (1998) Nb/Ta Fraction in a Cambrian Arc-Back System, New Zealand: Source Constraints and Application of Refined ICPMS Techniques. Chemical Geology, 144, 23-45. http://dx.doi.org/10.1016/S0009-2541(97)00105-8

 
 
Top