四川盐源西范坪渐新世含矿二长斑岩成因浅析
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摘要
四川盐源西范坪斑岩型铜矿位于扬子板块西南缘,通过对含矿二长斑岩进行锆石U-Pb定年,获得年龄为31.68±0.28 Ma(MSWD=1.2;2σ),表明其形成时代为古近纪渐新世早期,与区内碱性斑岩岩浆活动的高峰期一致。岩石碱度率指数(A.R.)为3.59～3.69,K/N为0.89～1.11,A/NK为1.16～1.24,A/CNK为0.97～1.13,属准铝—过铝质碱性石英二长斑岩;岩石高度富集轻稀土元素,相对亏损重稀土元素,δEu(0.80～0.85)异常不明显,并且富Sr贫Yb(Y),具高Sr/Yb和Sr/Y比值,系典型的埃达克岩。西范坪埃达克质含矿斑岩为印度板块与欧亚大陆板块碰撞造山晚期远程压力释放环境下,拆沉下地壳部分熔融的产物。
The Xifanping porphyry copper deposit, Yanyuan, is located in the southwestern Yangtze block. LA-ICP-MS zircon U-Pb dating yields an age of 31.68±0.28 Ma(MSWD=1.2; 2σ) for the ore-bearing monzonite porphyry, indicating that it formed in the Oligocene and is consistent to the peaking period of alkali-rich porphyritic magmatism in the region. A.R. value of 3.59～3.69, K/N ratio of 0.89～1.11, A/NK ratio of 1.16～1.24 and A/CNK ratio of 0.97～1.13 indicate that the ore-bearing monzonite porphyry are metaluminous-peraluminous and alkaline. The rock is highly enriched in LREE relative to HREE, without distinct Eu anomalies(δEu: 0.80～0.85). High Sr and low Yb and Y, and high Sr/Yb and Sr/Y ratios all suggest a typical adakite. The Xifanping adakitic ore-bearing porphyry should be the product of partial melting of delaminated lower crust in a late orogenic setting caused by stress released from the collision of the Indian and Eurasian blocks.
The Xifanping porphyry copper deposit, Yanyuan, is located in the southwestern Yangtze block. LA-ICP-MS zircon U-Pb dating yields an age of 31.68±0.28 Ma(MSWD=1.2; 2σ) for the ore-bearing monzonite porphyry, indicating that it formed in the Oligocene and is consistent to the peaking period of alkali-rich porphyritic magmatism in the region. A.R. value of 3.59～3.69, K/N ratio of 0.89～1.11, A/NK ratio of 1.16～1.24 and A/CNK ratio of 0.97～1.13 indicate that the ore-bearing monzonite porphyry are metaluminous-peraluminous and alkaline. The rock is highly enriched in LREE relative to HREE, without distinct Eu anomalies(δEu: 0.80～0.85). High Sr and low Yb and Y, and high Sr/Yb and Sr/Y ratios all suggest a typical adakite. The Xifanping adakitic ore-bearing porphyry should be the product of partial melting of delaminated lower crust in a late orogenic setting caused by stress released from the collision of the Indian and Eurasian blocks.
引文
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Wang Jiangzhen, Hu Ruizhong, Sun Yan, Xiao Yuanfu, Lu Yan, Li Zeqin. 2002a. Element’s mobility during potassium-silicate alteration of monzonite-porphyry: evidence from Xifanping porphyry copper deposit. Mineralogy and Petrology, 22(1):41～45 (in Chinese with English abstract).
Wang Jiangzhen, Li Chaoyang, Sun Yan, Li Zeqin.2002b. K-feldspar rapkivi texture and its implications Xifanping porphyry copper deposit, Sichuan. Journal of Chengdu University of Technology, 29(4):418～421 (in Chinese with English abstract).
Wang Jinfang, Li Yingjie, Li Hongyang, Dong Peipei.2017. Discovery of early Permian intra-oceanic arc adakite in the Meilaotewula ophiolite, Inner Monggolia and its evolution model. Acta Geologica Sinica. 91(8):1776～1795 (in Chinese with English abstract).
Wang Qiang, Wyman D A, Xu Jifeng, Zhao Zhenhua, Jian Ping, Xiong Xiaolin, Bao Zhiwei, Li Chaofeng, Bai Zhenghua. 2006. Petrogenesis of Cretaceous adakitic and shoshonitic igneous rock in the Luzong area, Anhui Province (eastern China): Implications for Geodynamics and Cu-Au mineralization. Lithos, 89:424～446.
Williams I S, Buick A, Cartwright I. 1996. An extended episode of early Mesoproterozoic metamorphic fluid flow in the Reynold region, central Australia. Journal of Metamorphic Geology, (14):29～47.
Wright J B. 1969. A simple alkalinity ratio and its application to questions of non-orogenic granite genesis. Geological Magazine, 106(4):370～384.
Xiao Yuanfu, Sun Yan, Lu Yan, Wang Jiangzhen, Wen ChunQi. 1999. Geochemical characteristics of fluid inclusions in the Xifanping porphyry copper deposit, Sichuan, China. Geology-Geochemistry, 35(6):37～39 (in Chinese with English abstract).
Xu Shijin, Shen Weizhou, Wang Rucheng, Lu Jianjun, Lin Yuping,Ni Pei. 1997. Characteristics and origin of Xifanping porphyry copper deposit, Yanyuan County, Sichuan Province. Acta Mineralogica Sinica, 17(1):56～62 (in Chinese with English abstract).
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Yin A. 2006. Cenozoic tectonic evolution of the Himalayan orogen as constrained by along-strike variation of structural geometry, exhumation history, and foreland sedimentation. Earth-Science Reviews,76:1～131.
Yu Chengling,Liu Qiang, Zhong Shixin. 2012. Geological-geochemical characteristics of Xifanping porphyry copper desposit, Yanyuan County, Sichuan Province. Acta Geologica Sichuan, 32:157～164 (in Chinese with English abstract).
Zeng Pusheng, Hou Zengqian, Gao Yongfeng, Du Andao.2006. The Himalayan Cu-Mo-Au mineralization in the eastern Indo-Asian collision zone: Constraints from Re-Os dating of molybdenite. Geological Review, 52(1):72～84 (in Chinese with English abstract).
Zhang Qi, Wang Yan, Qian Qing, Yang Jinhui, Wang Yuanlong, Zhao Taiping, Guo Guangjun. 2001. The characteristics and tectonic-metallogenic significances of the adakites in yanshan period from easternChina. Acta Petrologica Sinica, 17(2):236～244 (in Chinese with English abstract).
Zhang Qi, Wang Yan, Li Chengdong, Wang Yuanlong, Jin Weijun, Jia Xiuqin. 2006. Granite classification on the basis of Sr and Yb contents and its implications. Acta Petrologica Sinica, 22(9):2249～2269 (in Chinese with English abstract).
Zhu Yu, Lai Shaocong, Zhao Shaowei, Zhang Zezhong, Qin Jiangfeng. 2017. Geochemical characteristics and geological significance of the Neoproterozoic K-feldspar granites from the Anshunchang, Shimian area, western Yangtze Block. Geological Rivew, 63(5):1193～1208 (in Chinese with English abstract).
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Defant M J, Drummond M S. 1990. Derivation of some modern arc magmas by melting of young subduction lithosphere. Nature, 347:662～665.
Feng Chong, Wang Qingbin, Yang Bo, Zhao Guoxiang, Liu Xiaojian. 2016. Geochemical characteristic of Mesozoic granite of the Penglai 9-1 buried hill, Bohai Bay and its gologicalsignificance. Acta Geologica Sinica, 90(4):752～768 (in Chinese with English abstract).
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Fu Fang, Yang Zhusheng, Zhao Liqin. 2014. Metallogeneny and resources prodiction for the Xifanpingporphyry Cu deposit. Acta Geologica Sichuan, 34(1):44～48 (in Chinese with English abstract).
Hou Zengqian, Zhong Dalai, Deng Wanming. 2004. A tectonic model for porphyry copper-molybdnum-gold metallogenic belts on the eastern margin of the Qinghai-Tibet Plateau. Geology in China,31(1):1～14 (in Chinese with English abstract).
Hou Zengqian, Zeng Pusheng, Gao Yongfeng, Du Andao, Fu Deming. 2006. Himalayan Cu-Mo-Au mineralization in the eastern Indo-Asian collision zone: constraints from Re-Os dating of molybdenite. Miner. Deposita, 41:33～45.
Huang Xiaolong, Xu Yigang, Lan Jiangbo, Yang Qijun, Luo Zheng. 2009. Neoproterozoic adakitic rocks from Mopanshan in the western Yangtze Craton: Partial melts of a thickened lower crust. Lithos, 112:367～381.
Li Lizhu, Zhao Zhigang, He Jinliang, Yang Zexiang. 2006. Geological characteristics of Mofancun Himalayan porphyry copper deposit in Yanyuan, Sichuan Province. Mineral Deposit, 25(3):269～280 (in Chinese with English abstract).
Liu Yongsheng, Gao Shan, Hu Zhaochu, Gao Changgui, Zong Keqing, Wang Dongbing. 2010. Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen: U-Pb dating, Hf isotopes and trace elements in zicrons of mantle xenoliths. Journal of Petrology, 51(1&2):537～571.
Ludwing K R. 2008. Isoplot 3.70: A Geochronological Toolkit for Microsoft Excel. California: Berkeley Geochronology Center, 1～74.
Luo Yaonan. 1998. Intracontinent collision orogeny in Longmenshan-Jinpingshan. Chengdu:Sichuan Science and Technology Publishing House, 1～171 (in Chinese with English abstract).
Macpherson C G, Dreher S T, Thirlwall M F. 2006. Adakites without slab melting: High pressure differentiation of island arc magma, Mindanao, the Philippines. Earth and Planetary Science Letters, 243(3-4):581～593.
Meng Xiangshu, He Yanhong, Chen Liang, Wu Lei. 2017. The discovery of the earlyPaleozoic adakitic rocks in the conjunction of the Qinling and Qilian orogenic belts and its implications. Acta Geologica Sinica, 91(12):2679～2696 (in Chinese with English abstract).
Slama J, Kosler J, Condon D J, Crowley J L, Cerdes A, Hanchar J M, Horslwood M S A, Morris G A, Nasdala L, Norberg N, Schahegger U, Schoene B, Tubren M N, Whitehouse M J. 2008. Plesovice zircon-A new natural reference material for U-Pb and Hf isotopic microanalysis. Chemical Geology, 249:1～35.
Sun S S, McDonough W F. 1989. Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes. Geological Society, London, Special. Publication, 42:313～345.
Sun Yan, Xiao Yuanfu, Wen Chunqi, Wang Jiangzhen, Lu Yan. 2002. The discovery and Genesis of zinccopperote in a porphyry-copper deposit inXifanping, Sichuan Province. Bulletin of Mineralogy, Petrology and Geochemistry, 21(4):266～267 (in Chinese with English abstract).
Wang Jiangzhen, Hu Ruizhong, Sun Yan, Xiao Yuanfu, Lu Yan, Li Zeqin. 2002a. Element’s mobility during potassium-silicate alteration of monzonite-porphyry: evidence from Xifanping porphyry copper deposit. Mineralogy and Petrology, 22(1):41～45 (in Chinese with English abstract).
Wang Jiangzhen, Li Chaoyang, Sun Yan, Li Zeqin.2002b. K-feldspar rapkivi texture and its implications Xifanping porphyry copper deposit, Sichuan. Journal of Chengdu University of Technology, 29(4):418～421 (in Chinese with English abstract).
Wang Jinfang, Li Yingjie, Li Hongyang, Dong Peipei.2017. Discovery of early Permian intra-oceanic arc adakite in the Meilaotewula ophiolite, Inner Monggolia and its evolution model. Acta Geologica Sinica. 91(8):1776～1795 (in Chinese with English abstract).
Wang Qiang, Wyman D A, Xu Jifeng, Zhao Zhenhua, Jian Ping, Xiong Xiaolin, Bao Zhiwei, Li Chaofeng, Bai Zhenghua. 2006. Petrogenesis of Cretaceous adakitic and shoshonitic igneous rock in the Luzong area, Anhui Province (eastern China): Implications for Geodynamics and Cu-Au mineralization. Lithos, 89:424～446.
Williams I S, Buick A, Cartwright I. 1996. An extended episode of early Mesoproterozoic metamorphic fluid flow in the Reynold region, central Australia. Journal of Metamorphic Geology, (14):29～47.
Wright J B. 1969. A simple alkalinity ratio and its application to questions of non-orogenic granite genesis. Geological Magazine, 106(4):370～384.
Xiao Yuanfu, Sun Yan, Lu Yan, Wang Jiangzhen, Wen ChunQi. 1999. Geochemical characteristics of fluid inclusions in the Xifanping porphyry copper deposit, Sichuan, China. Geology-Geochemistry, 35(6):37～39 (in Chinese with English abstract).
Xu Shijin, Shen Weizhou, Wang Rucheng, Lu Jianjun, Lin Yuping,Ni Pei. 1997. Characteristics and origin of Xifanping porphyry copper deposit, Yanyuan County, Sichuan Province. Acta Mineralogica Sinica, 17(1):56～62 (in Chinese with English abstract).
Xu Zhiqin, Yang Jingsui, Li Haibing, Ji Shaocheng, Zhang Zeming, Liu Yan. 2011. On the tectonic of the India-Asia collision. Acta Geologica Sinica, 85(1):1～33 (in Chinese with English abstract).
Yin A. 2006. Cenozoic tectonic evolution of the Himalayan orogen as constrained by along-strike variation of structural geometry, exhumation history, and foreland sedimentation. Earth-Science Reviews,76:1～131.
Yu Chengling,Liu Qiang, Zhong Shixin. 2012. Geological-geochemical characteristics of Xifanping porphyry copper desposit, Yanyuan County, Sichuan Province. Acta Geologica Sichuan, 32:157～164 (in Chinese with English abstract).
Zeng Pusheng, Hou Zengqian, Gao Yongfeng, Du Andao.2006. The Himalayan Cu-Mo-Au mineralization in the eastern Indo-Asian collision zone: Constraints from Re-Os dating of molybdenite. Geological Review, 52(1):72～84 (in Chinese with English abstract).
Zhang Qi, Wang Yan, Qian Qing, Yang Jinhui, Wang Yuanlong, Zhao Taiping, Guo Guangjun. 2001. The characteristics and tectonic-metallogenic significances of the adakites in yanshan period from easternChina. Acta Petrologica Sinica, 17(2):236～244 (in Chinese with English abstract).
Zhang Qi, Wang Yan, Li Chengdong, Wang Yuanlong, Jin Weijun, Jia Xiuqin. 2006. Granite classification on the basis of Sr and Yb contents and its implications. Acta Petrologica Sinica, 22(9):2249～2269 (in Chinese with English abstract).
Zhu Yu, Lai Shaocong, Zhao Shaowei, Zhang Zezhong, Qin Jiangfeng. 2017. Geochemical characteristics and geological significance of the Neoproterozoic K-feldspar granites from the Anshunchang, Shimian area, western Yangtze Block. Geological Rivew, 63(5):1193～1208 (in Chinese with English abstract).
参考文献陈培荣,徐士进,王汝成,陈小明,沈渭洲,倪培.1997.四川盐源西范坪斑岩铜矿富铜流体物理-化学特征和成因.地球化学,26(5):54～61.
冯冲,王清斌,杨波,赵国祥,刘晓健.2016.渤海海域蓬莱9-1构造潜山中生代花岗岩元素地球化学特征及其地质意义.地质学报,90(4):752～768.
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