Abstract
The Suzhou granite suite is the anorogenic product, which is located on the inactive continental margin of east China. It was emplaced about 141 Ma ago, occurring as a stock with a polygonal outline on the surface, belonging to alkali potash-feldspar granites with K2O > Na2O, Reit’s alkali coefficient = 0.694, SiO2 = 74.95, and Al2O3/(K2O + Na2O)mol= 1. Besides K and Na, Li and Rb are also rather high. Highlycharged metals such as Zr, Nb, REE, Y, Sn, Th, Ga and Zn are 10, or even 50 times higher than those in the ordinary granites. Halogen elements such as F and Cl are high in abundance with F = 2700 ppm and Cl = 170 ppm on average. The abundances of deep-source elements such as Ti, Al, Ca, Mg and P are relatively low, with A12O3 = 12.65% and Ca + Mg < 1%. High Ga and low Al contents are typomorphically characteristic of A type granites.
Biotite in the rocks is, for the most part, annite, usually filling in quartz and feldspar crystals, indicating that the crystallization of magma proceeded under relatively anhydrous condition.
More than 40 kinds of accessory minerals have been identified, of which the mantle-derived mineral chrompicotite and moissanite is of great interest.
Two different intrusions, the major and supplementary intrusions, can be distinguished in the granite suite. The rock-forming temperature is estimated to be 810°C, pressure 2.5 kbars, pH 8.1,18O/16O low(δ18OWR = 6.19‰), andfo2= 10−16. The abundances of REE are high and Eu depletion is remarkable (δEu = 0.24).
A variety of mineral deposits related to the Suzhou granite suite have been recognized.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Wang Wenbin,Geology of East China, 1(1979), 15–44 (in Chinese).
Collings, W.T. et al.,Contrib. Min. Petrol., 80(1982), 189–200.
Wu Liren,Acta Petrologica Sinica, 1(1985), 1–9 (in Chinese).
Zhang Xinglong et al., Characteristics of Columbite-bearing Granite in Suzhou and Classification of Facies Zones, 1961, published by Institute of Geological Sciences of the Bureau of Geology and Mineral Resources, Jiangsu Province, 1–20 (in Chinese).
Institute of Geochemistry, Academia Sinica, «Geochemistry of Granitoids in South China», 1979, Science Press, Beijing, 10–78 (in Chinese).
Kanisawa, S., Plutonism in Relation to Volcanism and Metamorphism, papers presented to the 7th CPPP Meeting, 1977, 1–20.
Deer, W.A. and Howie, R.A.Rock-forming Minerals, Longmans, 3(1963), 55–66.
Kosaps, Ya.A., «Main Geochemical Characteristics of Rare Elements in Granitic Melts and Solutions», 1983, Geological Publishing House, Beijing, 1–70 (Chinese version, translated by Yuang Zongxin et al.).
Hong Wenxing et al., Chemical Composition and RE Geochemical Characteristics of Suzhou Granite-type Columbite Deposits in Jiangsu Province, 1965, published by Institute of Geology, Academia Sinica (in Chinese).
Institute of Geochemistry, Academia Sinica, «A Concise Handbook of Geochemistry», 1977, Science Press, Beijing, 76–77 (in Chinese).
Christiansen, F.H. et al.,Contrib. Min. Petrol., 1983, 16–30.
Peng Yaming and Yuan Pu,Bulletin of Nanjing University, 20, 4(1984), 740–751 (in Chinese).
G. Faure, «Principle of Isotope Geology», 1983, Science Press, Beijing, 280–289 (Chinese version, translated by Pan Shulan et al.).
Wang Kaiyi,Foreign Geology, 80, 1(1980), 1–13(in Chinese).
Chen Yinghan et al., «Geochemistry of Mineral Inclusions», 1981, published by Hebei Geological College, Shijiazhuang, 10–28 (in Chinese).
Wones, D.R. and Engster, H.P.,Amer. Min., 50, 9(1965), 1244–1255.
Engster, H.P. and Wones, D.R.,Jour. Petrol, 3(1962), 1.
Chappell, B.W. and White, A.J.R.,Pacific Geology, 8(1974), 173–174.
Bowden, P. and Kinaird, J.A., Transaction Inst. Min. Metall., Sect. B., 87(1978), 21–53.
Ishihara, S.,Mining Geology, 27(1977), 293–365.
Department of Geology, Nanjing University, «Granitoids of Various Periods in South China in Relation to Mineralizations», 1981, Science Press, Beijing, 132–189 (in Chinese).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Xinglong, Z., Jiabing, W. & Bochun, S. A study on A-type granites in Suzhou, China. Chin. J. of Geochem. 7, 29–45 (1988). https://doi.org/10.1007/BF02840428
Issue Date:
DOI: https://doi.org/10.1007/BF02840428