Lithogeochemistry and island arc origins of Don Javier porphyry coppermolybdenum deposit in southern Peru
-
摘要:
秘鲁南部古新世-始新世斑岩铜钼成矿带是安第斯成矿带的重要组成部分，产出有大量世界级斑岩铜钼矿床，最近勘探的Don Javier斑岩铜钼矿床是该成矿带中的又一重大发现。本文对Don Javier矿床的含矿斑岩、围岩的岩石学和地球化学进行了研究，以探讨岩石成因和矿床形成的构造环境。主量元素和微量元素地球化学特征表明：①含矿斑岩体属过铝质钙碱性系列英安斑岩，围岩为过铝质钙碱性系列的花岗闪长岩，且二者具有相同的物质来源；②两类岩石均具有轻稀土富集，富大离子亲石元素特征，在球粒陨石标准化稀土配分曲线图上呈明显的右倾型，左陡而右缓，且二者均显示Eu负异常，表明岩浆岩的成岩过程中有结晶分异作用或其他地质作用参与；③含矿斑岩体和围岩形成于岛弧环境，为经典岛弧岩石；④Don Javier铜钼矿床可能是在纳斯卡板块向南美板块俯冲，熔融形成的钙碱性岩浆、岩浆弧走滑挤压环境的有利条件下形成。
Abstract:The belt of Palaeocene-Eocene copper-molybdenum porphyry deposits in southern Peru is an important part of the Andes metallogenic belt with a large number of world-class porphyry copper-molybdenum deposits. The recently explored Don Javier porphyry copper-molybdenum deposit is another major discovery in this belt. In this paper, studies of the petrology and geochemistry of ore-bearing porphyry and surrounding rocks were conducted to validate their petrogenesis and tectonic setting. According to major and trace element characteristics, the authors have reached some conclusions:① The ore-bearing porphyry belongs to peraluminous calc alkaline series dacite porphyry, the surrounding rocks belong to peraluminous calc alkaline series of granodiorite, and both have the same material source. ② The two types of rocks are enriched in light rare earth element and large ion lithophile elements; in chondrite normalized rare-earth element pattern, they show obvious right deviation type characterized by left steep and right slow, and both show Eu negative anomaly, which indicates that the petrogenesis of magmatic rocks involved crystallization differentiation or other geological processes. ③ The ore-bearing porphyry and surrounding rocks were formed in an an island arc environment, belonging to a classic rock island. ④ The Don Javier copper molybdenum deposit may have been formed in favourable conditions of the subduction of Nazca Plate to the South American plate, the melting of calc alkaline magma and the strike slip extrusion.
-
Key words:
- geochemistry /
- trace elements /
- tectonic environment /
- porphyry copper-molybdenum deposit /
- Don Javier /
- Peru
-
-
图 1 古新世—始新世斑岩铜-钼成矿带中的主要矿床及地质构造环境和侵入岩（据Acosta et.al, 2008修改）
Figure 1.
图 8 Don Javier矿床花岗闪长岩和英安斑岩(La/Yb)N-YbN、Sr/Y-Y判别图解（据Defant et al, 1990）
Figure 8.
图 9 Don Javier矿床花岗闪长岩和英安斑岩Rb-(Yb+Ta)、Ta-Yb、Rb-(Y+Nb)、Nb-Y判别图解（底图据Pearce et al., 1984）
Figure 9.
图 10 Don Javier矿床花岗岩类的SiO2-lgCa/(Na2O+K2O) (据Brown, 1982)
Figure 10.
表 1 花岗闪长岩、英安斑岩主量元素分析数据(10-2)及相关参数
Table 1. Major element compositions(10-2)and related parameters of granodiorite and dacite porphyry
下载: 导出CSV
表 2 花岗闪长岩、英安斑岩微量元素分析数据(10-6)及相关参数
Table 2. Trace element compositions (10-6)and related parameters of granodiorite and dacite porphyry
下载: 导出CSV
-
Acosta H, Quispe J, Santiesteban A. and Acosta J.2008.Épocas metalogenéticasy tipos de yacimientos metálicos en la margen occidental del Sur del Perú: latitudes 14's-18's.
Resúmenesextenidos XIV CongresoPeruano de Geología[C]. 273. AMC Mining Consultants(Canada) Ltd.2013.Don Javier Cu-Mo project Arequipa, Peru Technical Report[R].75-76
Beijing General Research Institute of Mining & Metallurgy. 2013. Research Report on Mineral Processing Technology of Don Javier Copper Molybdenum Ore[R]. 3-25(in Chinese).
Bustamante A, Cardozo M, Acosta J. 2014. Overview of the main Peruvian Copper Porphyry Belts and Deposits[R]. 2-27
Brown G C.1982.Calc-alkaline intrusive rocks their diversity, evolution, and relation to volcanic arcs[C]//Thorpe R S(ed.). Andesites-orogenic Andesites and Related Rocks. New York: John Wiley & Sons, 437-464.
Deckart K, Silva W, Spröhnle C, Vela I.2014. Timing and duration of hydrothermal activity at the Los Bronces porphyry cluster:An update[J]. Mineralium Deposita, 49:535-546. doi: 10.1007/s00126-014-0512-9
Defant M J, Drummond M S. 1990. Derivation of some morden arc magmas by of young subducted lithosphere[J]. Nature, 347:662-665. doi: 10.1038/347662a0
Dela Roche H, Leterrier J, GrandclaudeP. 1980. A classification of volcanic and plutonic rocks using R1-R2 diagram and majorelement analyses——Its relationships with current nomenclature[J]. Chemical Geology, 29:183-210. doi: 10.1016/0009-2541(80)90020-0
Green T H, Pearson N J. 1986. Rare-earth element partitioning between sphene andcoexisting silicate liquid at high pressure and temperature[J]. Chemical Geology, 55(1/2):105 -119. http://www.sciencedirect.com/science/article/pii/0009254186901312
Instituto Geológico Mineroy Metalúrgico(INGEMET).Estudio de los Recursos Minerales del Perú[R]. 2003: 12-25.
Jahn B M, Wu F Y, Lo C H. 1999. Crust-mantle interaction induced by deep subduction of the continental crust:Geochemical and SrNd isotopic evidence from post-collisional mafic-ultramafic intrusions of the northern Dabie complex central China[J]. Chemical Geology, 157(1/2):119 -146. http://www.sciencedirect.com/science/article/pii/S0009254198001971
Jin Wenqiang. 2010. On Geological Features and Genesis Study of the Cercana-Don jovier Porphyry Copper Deposit in Southern Peru(disseration for master degree)[D]. Changsha: Central South University, 7-16(in Chinese with English abstract).
Le Bel L M. 1985. Mineralization in the Arequipa segment: The porphyry Cu deposit of Cerro Verde/Santa Rosa[C]//Pitcher W S, Atherton M P, Cobbing E J, Beckinsale R D (eds.). Magma-tism at a plate edge. The Peruvian Andes. New York: JohnWiley and Sons Inc. 250-260.
Li Changnian.1992.Traceelements Petrology of Igneous Rocks[M]. Wuhan:China University of Geosciences Press, 74-117.
Li Zhidan, Chen Junqiang, Wang Jiaying, Wen Sibo, Xiao Zhibin, Tang Chao, Liu Xing, Yu Reng'an. 2016. Geology and geochemistry of the Gonghudong skarn copper deposit in Darhan Muminggan Joint Banner, Inner Mongolia and its significance[J]. Geology in China, 43(4):1367-1384(in Chinese with English abstract).
Maniar P D, Piccoli P M. 1989. Tectonic discrimination of granitoids[J]. Geological Society of America Bulletin, 101(5):635-643. doi: 10.1130/0016-7606(1989)101<0635:TDOG>2.3.CO;2
Mao Jingwen, Luo Maocheng, Xie Guiqing, Liu Jun, Wu Senghua. 2014. Basic characteristics and new advances in reserch and exploration on porphyry copper deposits[J]. Acta Geologica Sinica, 88(12):2156-2169(in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-ELEW201405145.htm
Middlemost E A K. 1994. Naming materials in the magma/igneous rock system[J]. Earth Science Reviews, 37(3/4):215-224. http://www.sciencedirect.com/science/article/pii/0012825294900299
Pearce J A, Harris N B W, Tindle A G. 1984.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J]. Journal of Petrology, 25:956-983. doi: 10.1093/petrology/25.4.956
Sun S S, McDonough W F. 1989. Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes[C]//Saunders A D, Norry M J(eds.). Magmatism in the Ocean Basins. Geological Society, London, Special Publications, 42: 313-345.
Sun Zhuanrong, Dong Guochen, Zhao Zuoxin, Wang Weiqing, Liu Shengqiang. 2017. Petrological, geochemical and geochronological features of Lailishan ganitoids in western Yunnan and their genesis of partial melting of crustal soure[J]. Geology in China, 44(6):1140-1158(in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DIZI201706010.htm
Thompson R N. 1982. Magmatism in the British Tertiary volcanic province, Scott[J]. Geology, 18:49-107. http://petrology.oxfordjournals.org/cgi/ijlink?linkType=ABST&journalCode=sjg&resid=18/1/49
Wei Shaogang, Song Yang, Tang Juxing, Gao Ke, Feng Jun, Li Yanbo, Hou Lin. Geochronology, geochemistry and petrogenesis of quartz diorite porphyrite from the Sena copper (gold) deposit, Tibet[J]. Geology in China, 2016, 43(6):1894-1912(in Chinese with English abstract). http://www.en.cnki.com.cn/Article_en/CJFDTOTAL-DIZI201606005.htm
William M V. 2005. The Late Paleozoic-Early Mesozoic Chocolate Formation ofsouthern Peru: New data and interpretations[C]//The International Symposium Onandean Geodynamics, Extended Abstracts, 490-492.
Winter J D. 2001. An Introduction to Igneousand Metamorphic Petrology[M]. NewJersey: PrinceHall, 1 -697.
Wright J B. 1969. A simple alkalinity ratio and its application to questions ofnon-orogenic granite genesis[J]. Geological Magazine, 106:370-384. doi: 10.1017/S0016756800058222
Zhang Dongyang, Zhang Zhaocong, Xue Chunji, Ai Yu. 2010. Petrology and geochemistry of the ore-forming porphy ries in the Lamasu copper deposit, western Tianshan:Implications for petrogenesis[J]. Acta Petrologica Sinica, 26(3):680-694(in Chinese with English abstract).
Zhao Zhenhua, . 1982. Research methord of rare earth element geochemistry[J]. Geology and Geochemistry, (1):26-33(in Chinese).
金文强. 2010.秘鲁南部Cercana-Don Jovier斑岩铜矿地质特征及成因探讨(硕士论文)[D].长沙: 中南大学, 7-16.
http://cdmd.cnki.com.cn/article/cdmd-10533-2010187531.htm 李昌年. 1992.火成岩微量元素岩石学[M].武汉:中国地质大学出版社, 74-117.
李志丹, 陈军强, 王佳营, 文思博, 肖志斌, 汤超, 赵行, 俞礽安. 2016.内蒙古达茂旗宫忽洞矽卡岩型铜矿床地质、地球化学特征及其意义[J].中国地质, 43(4):1367-1384. http://geochina.cgs.gov.cn/ch/reader/view_abstract.aspx?file_no=20160421&flag=1
毛景文, 罗茂澄, 谢桂青, 刘军, 吴胜华. 2014.斑岩铜矿床的基本特征和研究勘查新进展[J].地质学报, 88(12):2156-2169. http://d.old.wanfangdata.com.cn/Periodical/dizhixb201412002
孙转荣, 董国臣, 赵作新, 王伟清, 刘圣强. 2017.滇西来利山花岗岩年代学、地球化学特征及其壳源部分熔融成因[J].中国地质, 44(6):1140-1158. http://geochina.cgs.gov.cn/ch/reader/view_abstract.aspx?file_no=20170609&flag=1
韦少港, 宋扬, 唐菊兴, 高柯, 冯军, 李彦波, 候淋. 2016.西藏色那铜(金)矿床石英闪长玢岩年代学、地球化学与岩石成因[J].中国地质, 43(6):1894-1912. http://geochina.cgs.gov.cn/ch/reader/view_abstract.aspx?file_no=20160605&flag=1
张东阳, 张招崇, 薛春纪, 艾羽. 2010.西天山喇嘛苏铜矿成矿斑岩的岩石学、地球化学特征及成因探讨[J].岩石学报, 26(3):680-694. http://d.old.wanfangdata.com.cn/Periodical/ysxb98201003004
赵振华. 1982.稀土元素地球化学研究方法[J].地质地球化学, (1):26-33. http://cdmd.cnki.com.cn/Article/CDMD-10674-1011057516.htm
-
图(10)
表(2)
计量
- 文章访问数: 2648
- PDF下载数: 1073
- 施引文献: 0