江西武山铜矿区花岗闪长斑岩的地球化学和Sr-Nd-Hf同位素组成及成因探讨
Geochemical and Sr-Nd-Hf isotopic compositions of granodiorite from the Wushan copper deposit, Jiangxi Province and their implications for petrogenesis
-
摘要: 武山铜矿床是位于长江中下游地区九瑞矿集区中的一个大型铜矿床.本文对该矿床中与成矿关系密切的花岗闪长斑岩进行了详细的矿物化学、主量元素、微量元素、Sr-Nd-Hf同位素研究.结果表明,岩体中黑云母富镁,为金云母,其Fe3 /Fe2 组成表明岩浆氧逸度很高;角闪石具有Mg/(Mg Fe)高而Si低的特征,为阳起石和镁质角闪石,角闪石压力计计算表明岩体具有超浅成侵位特征.花岗闪长斑岩具有埃达克岩地球化学特征.岩石具有相对较高的SiO2(64.9%～68.62%,平均66.52%)和Al2O3(14.0%～15.3%,平均14.8%)含量,同时岩石的Mg#很高(0.53～0.71),并具有相对较高的相容元素含量;岩石富集轻稀土((La/Yb)N=27.8～64.5),Eu负异常不明显,岩石同时富集大离子亲石元素,亏损高场强元素,具有较高的Sr/Y比值(35.0～68.2).岩石的初始87Sr/86Sr比值为0.7067～0.7075,εNd(t)值为-4.08～-4.44,锆石的εHf(t)值为-2.1～-7.0.详尽的元素和同位素地球化学特征表明武山花岗闪长斑岩是强烈壳幔相互作用的产物,很有可能是由拆沉的加厚下地壳发生部分熔融,并在其上升过程中与地幔橄榄石发生相互作用而形成的.
-
关键词:
- 武山铜矿 /
- 花岗闪长斑岩 /
- 地球化学特征 /
- Sr-Nd-Hf同位素组成 /
- 壳幔相互作用
-
-
[1] Addel-Reham AM. 1994. Nature of biotites from alkaline, cale-alkaline and peraluminous magmas. J. Petrol. , 35:525 -541
[2] Annen C and Sparks RSJ. 2002. Effects of repetitive emplacement of basaltic intrusions on thermal evolution and melt generation in the crust. Earth Planet. Sci. Lett. , 203:937 -955
[3] Bao JB, Tang SQ and Yu ZQ. 2002. Geology of Jiangxi Copper Deposits. Nanchang: Jiangxi Science & Technology Press, 75 -85
[4] Boynton WV. 1984. Geochemistry of the rare earth elements: Meteorite studies. In: Henderson P ( ed. ). Rare Earth Elements Geochemstry. Elsevier, 63 - 114
[5] Chen JF, Yan J, Xie Z, Xu X and Xing F. 2001. Nd and Sr isotopic compositions of igneous rocks from the Lower Yangtze region in eastern China : Constraints on sources. Phys. Gem. Earth ( A), 26 : 719 -731
[6] Cui B, Yang MY and Zhan ZY. 2002. Research genetic mineralogy of pyrite for north ore zone of Wushan copper deposit. Geology and Prospecting, 38 (5) : 44 -48
[7] Defant MJ, Xu JF and Kepezhinskas P. 2002. Adakites: Some variations on a theme. Acta Petrologica Sinica, 18:129 -142
[8] Depaolo DJ and Wasserburg GJ. 1979. Petrogenetic mixing models and Nd-Sr isotopic patterns. Geochim. Cosmochim. Acta, 43:615 - 627
[9] Ding X, Jiang SY, Ni P et al. 2005. Zircon SIMS U-Pb geochronology of host granitoids in Wushan and Yongping vopper deposits, Jiangxi Province. Geol. Jour. China Univ. , 11 (3) : 383 - 389
[10] Ding X, Jiang SY, Zhao KD et al. 2006. In-situ U-Pb SIMS dating and trace element (EMPA) composition of zircon from a granodiorite porph)Ty in the Wushan copper deposit, China. Contri. Mineral. Petrol. , 86:29-44
[11] Dong P, Wang WB, Li WD et al. 1995. The Sr-isotopic geochemistry and the genesis of stratabound cupriferous pyrite ore-bodies in Wushan copper deposit, Jiangxi, East China. Volcanology & Mineral Resources, 16 ( 2 ) : 94 - 100
[12] Du YS, Qing XL and Lee HK. 2004a. Mesozoic mantle-derived magma underplating in Tongling, Anhui Province : Evidence from megacrysts and xenoliths. Acta Petrol. Mineral. , 23 (2) : 109 - 116
[13] Du YS, Qin XL and Tian SH. 2004b. Mesozoic magmatic to hydrothermal process in the Tongguanshan ore field, Tongling, Anhui Province, China: Evidence from xenoliths and their hosts. Acta Petrologica Sinica, 20 ( 2 ) : 339 - 350
[14] Gao JF, Lu JJ, Lai MY et al. 2003. Analysis of trace elements in rock samples using HR-ICPMS. Jour. Nanjing Univ. (Natural Sci. ), 39 (6) : 844 -850
[15] Gu LX. 1984. The Middle Carboniferous marine voleanies and the origin of the bedded ore in Wushan, Jiangxi Province. Journal of Gulin College of Geology, 4 (4): 91 - 102
[16] Gu LX. 1987. The Mesozoic intrusive associated with the carboniferous massive sulphide ore deposit in Wushan, Jiangxi Province. Acta Petrologica Sinica, ( 1 ) : 64 - 76
[17] Gu LX and Xu KQ. 1986. On the Carboniferous submarine massive sulphide deposits in the lower reaches of the Chanjiang ( Yangzi ) river. Acta Geol. Sinica, 60 ( 2 ) : 176 - 188
[18] Gu LX, Zaw K, Hu WX et al. 2007. Distinctive features of Late Palaeozoic massive sulphide deposits in South China. Ore Geol. Rev. , 31(1 -4) : 107 -138
[19] Harrison TM and Watson EB. 1984. The behavior of apatite during crustal anatexis: Equilibrium and kinetic considerations. Geochim. Cosmochim. Acta, 48 : 1467 - 1477
[20] Hollister LS, Grisson GC, Peters EK et al. 1987. Confirmation of the empirical correlation of Al in hornblende with pressure of solidification of calc-alkaline plutons, Am. Mineral. , 72 ( 3 - 4) : 231 - 239
[21] Jahn BM and Condie KC. 1995. Evolution of the Kaapvaal craton as viewed from geochemical and Sm-Nd isotopic analyses of intracratonic pelites. Geochim. Cosmochim. Acta, 59:2239-2285
[22] Huppert HE and Sparks RSJ. 1998. The generation of granitic magmas by intrusion of basalt into continental crust. J. Petrol. , 29 : 599 - 624
[23] Leake BE, Woolley AR, Arps CES et al. 1997. Nomenclature of amphiboles: Report of the Subcommittee on amphiboles of the international mineralogical association commission on new minerals and mineral names. Mineral. Mag. , 61 (2) : 295 -321
[24] Li JW, Pei RF, Zhang DQ et al. 2007. Geochemical characteristics of the Yanshanian intermediate-acid intrusive rocks in the Tongling mineralization concentration area, Anhui Province, and their geological implications. Acta Geosci. Sinica, 28 ( 1 ) : 11 - 22
[25] Liew TC and Hofmann AW. 1988. Precambrian crust components, plutonic associations, plate environment of the Hercynian Fold Belt of central Europe: Indication from Nd and Sr study. Contrib. Mineral. Petrol. , 98 : 129 - 138
[26] Ling HF, Shen WZ, Deng Pet al. 2004. Age, geochemistry and petrogenesis of the Sundong granite, northern Guangdong province. Acta Petrologica Sinica, 20 ( 3 ) : 413 - 424
[27] Lou YE and Du YS. 2006. Characteristics and genesis of biotites from the Mesozoic intrusive rocks in the Fanchang-Tongling area, Anhui Province. Acta Mineral. Sinica, 26 ( 2 ) : 175 - 180
[28] McDonough WF and Sun S-s. 1995. The composition of the Earth. Chem. Geol., 120(3-4): 223-253
[29] Mungall JE. 2002. Roasting the mantle: Slab melting and the genesis of major Au and Au-rich Cu deposits. Geology, 30:915 -918
[30] Oyarzun R, Maroueza LJ, Lopez I a al. 2001. Giant versus small porphyry copper deposits of Cenozoic age in northern Chile : Adakitic versus normal calc-alkaline magmatism, Mineral. Deposita, 6 (7) : 94 - 98
[31] Pu W, Gao JF, Zhao KD et al. 2005. Separation method of Rb-Sr, Sta- Nd using DCTA and HIBA. Jour. Nanjing Univ. ( Natural Sci. ), 41 (4) : 445 -450
[32] Qiu js, Hu J, McInnes BIA et al. 2004. Geochronology, geochemistry and petrogenesis of the Longwo granodioritic pluton in Guangdong Province. Acta Petrologica Sinica, 20 ( 6 ) : 1363 - 1374
[33] Rieder M, Cavazzini G, D\\'yakonov YS et al. 1998. Nomenclature of micas. Can. Mineral. , 36:905-912
[34] Schmidt MW. 1992. Amphibole composition in tonalites as a function of pressure: An experimental calibration of the Al-in-homblende barometer. Contrib. Mineral, Petrel. , 110(2-3): 304-310
[35] Sun WD, Arculus R J, Kamenetsky VS et al. 2004. Release of goldbearing fluids in convergent margin magmas prompted by magnetite crystaUization. Nature, 431:975-978
[36] Sylvester PJ. 1998. Post-collisional strongly peraluminous granites. Lithos, 45 : 29 - 34
[37] Wang Q, Xu JF, Zhao ZH et al. 2003. Petrogenesis of the Mesozoic intrusive rocks in the Tongling area, Anhui Province, China and their constraint on geodynamie process. Science in China (Series D), 33(4) : 323 -334
[38] Wang Q, Zhao ZH, Jiang Pet al. 2004. SHRIMP zircon geochronology and Nd-Sr isotopic geochemistry of the Dexing ~anodiorite prophyrite. Acta Petrologica Sinica, 20(2) : 315 -324
[39] Wang Q, Wyman DA, Xu JF et al. 2007. Partial melting of thickened or delaminated lower crust in the middle of eastern China: Implications for Cu-Au mineralization. J. Geol. , 115:149 -161
[40] Watson EB and Harrison TM. 1983. Zircon saturation revisited: Temperature and composition effects in avariety of crustal magma types. Earth Planet Sci. Lett. , 64:295 -304
[41] Watson EB and Harrison TM. 2005. Zircon thermometer reveals minimum melting conditions on earliest Earth. Science, 308:841 -844
[42] Watson EB, Wark DA and Thomas JB. 2006. Crystallization thermometers for zircon and futile. Contrib. Mineral. Petrol. , 151 : 413 - 433
[43] Wones DR and Eugster HP. 1965. Stablility of biotite: Experiment, theory, and application. Am. Mineral, 50:1228-1272
[44] Wu FY, Li XH, Yang JH et al. 2007. Discussions on the petrogenesis of granites. Acta Petrologica Sinica, 23(6) : 1217 -1238
[45] Wyborn D and Sun SS. 1994. Sulphur-undersaturated magraatism: A key factor for generating magma-related copper-gold deposits. AGSO Research Newsletter, 21:7 -8
[46] Xie G, Mao J, Li R and Bierlein FP. 2008. Geochemistry and Nd - Sr isotopic studies of Late Mesozoic granitoids in the southeastern Hubei Province, Middle - Lower Yangtze River belt, Eastern China: Petrogenesis and tectonic setting. Lithos, doi:10. 1016/j. lithos. 2007.12.008
[47] Xiong XL. 2006. Trace element evidence for growth of early continental crust by melting of rutile-bearing hydrous eclogite. Geology, 34 : 945 - 948
[48] Xiong XL, Adam J and Green TH. 2005. Rutile stability and rutile/melt HFSE partitioning during partial melting of hydrous basalt: Implications for TTG genesis. Chem. Geol. , 218:339-359
[49] Xu HJ and Ma CQ. 2003. Constraints of experimental petrology on the origin of adakites and petrogenesis of Mesozoic K-rich and high Sr/Y ratio granitoids in eastern China. Earth Sci. Frontier, 10 (4): 417 -427
[50] Xu KQ, Wang HN, Zhou JP et al. 1996. On the exhalative sedimentary massive sulfide deposits in south China. Geol. Jour. China Univ. , 2 ( 3 ) : 241 - 255
[51] Xu XS, Fan QC, SY O\\'Reilly et al. 2004. U-Pb dating of zircons and petrogenic implications for Tongguanshan wuartz diorite and its Enclaves, Anhui Province. Chinese Sci. Bull., 49 (19): 2073 - 2082
[52] Yang XN, Xu ZW, Zhang Jet al. 2007. Geochronology and origin of Nanhongehong pluton in Shizishanore field, Anhui Province. Acta Petrologica Sinica, 23 (6) : 1543 - 1551
[53] Yu JH, Zhou XM, Zhao L et al. 2005. Mantle-crust interaction generating the Wuping granites: Evidenced from Sr-Nd-Hf-U-Pb isotopes. Acta Petrologica Sinica, 21 (3) :651 -664
[54] Zhang Q, Wang Y, Li CD et al. 2006. Granite classification on the basis of Sr and Yb contents and its implications. Acta Petrologica Sinica, 22 (9) : 2249 -2269
[55] Zheng Q. 1983. Caeulation of the Fe^3+ and Fe^2+ contents in silicates and Fe-Ti oxides from EMPA data. Acta Mineral. Sin. , 1 : 55 -62
[56] Zhou XR and Ren J. 1994. Mesozoic Granitoids of the Middle and Lower Reaches of the Yangtze River. Beijing: Geological Publishing House, 1 - 119
[57] Zhou TF, Yue SC and Yuan F. 2005. Lithogenesis of diorites and copper, gold mineralization in Yueshan ore field, Anhui Province. Beijing: Geol. Pub. House, 1-186
[58] Zhou TF, Yuan F, Yue SC, Liu XD, Zhang X and Fan Y. 2007. Geochemistry and evolution of ore-forming fluids of the Yueshan Cu- Au skarn- and vein-type deposits, Anhui Province, South China. Ore Geology Reviews, 31 (2) : 279 - 303
[59] Zhou TF, Fan Y and Yuan F. 2008. Advances on petrogensis and metallogeny study of the mineralization belt of the Middle and Lower Reaches of the Yangtze River area. Acta Petrologica Sinica, 24 (8) : 1665 -1678
[60] Zhou TF, Fan Y, Yuan F, Lu SM, Shang SG, David Cooke, Sebastien Meffre and Guochun Zhao. 2008. Geochronology of the volcanic rocks in the Lu-Zong(Lujiang-Zongyang) basin and its significance. Science in China ( Series D), 51 (10) : 1470 - 1482
-
计量
- 文章访问数: 12700
- PDF下载数: 13553
- 施引文献: 0
下载: