粤东北仁差盆地麻楼铀矿区次火山岩地球化学特征及成因
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摘要
仁差盆地麻楼铀矿区矿床主要赋存于EW向麻楼构造带中的次流纹斑岩中,为厘清赋矿岩石地球化学特征及成因,对该地区次火山岩进行全量分析测试。结果表明,该岩体岩性以次火山岩为主,矿物组成具长英质火山岩特征,本区次流纹斑岩元素组成具富碱、富钾、贫铁及硅、铝过饱和特征,属高钾钙碱性系列或钾玄岩系列火山岩,其主量元素、微量元素和稀土元素特征反映物质来源具壳源性质。
Deposit of Malou uranium mining area in Rencha basin mainly occur in supergene rhyolite porphyry, which is produced in Malou structural belt. In order to clarify the geochemical characteristics and petrogenesis of the ore bearing rocks, a total analysis of subvolcanic rocks is carried out in this paper. The results of systematic analytical test show that the rock mass is dominated by subvolcanic rocks and the mineral composition has the characteristics of felsic volcanic rocks. The subfluvial porphyry elements in this region are characterized by rich alkali, rich potassium, poor iron and silicon aluminum supersaturation,belonging to high potassium calcium alkaline series or potassium basaltic series. The characteristics of its main content elements, trace elements and rare earth elements reflect its material origin has shell source property.
Deposit of Malou uranium mining area in Rencha basin mainly occur in supergene rhyolite porphyry, which is produced in Malou structural belt. In order to clarify the geochemical characteristics and petrogenesis of the ore bearing rocks, a total analysis of subvolcanic rocks is carried out in this paper. The results of systematic analytical test show that the rock mass is dominated by subvolcanic rocks and the mineral composition has the characteristics of felsic volcanic rocks. The subfluvial porphyry elements in this region are characterized by rich alkali, rich potassium, poor iron and silicon aluminum supersaturation,belonging to high potassium calcium alkaline series or potassium basaltic series. The characteristics of its main content elements, trace elements and rare earth elements reflect its material origin has shell source property.
引文
[1]刘国奇,赵葵东,夏菲.广东仁差盆地火山岩型铀矿床成岩成矿时代和成因研究[J].矿物学报,2015(S1):710.
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[4] Pearce, J.A. Tectonic implications of the composition of volcanic arc magmas[J]. Earth and Planetary Science.1995,23:251-285.
[5] Green T H. Significance of Nb/Ta as an indicator of geochemical processes in the crust-mantle system[J]. Chemical Geology, 1995,120(3):347-359.
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[7] Liu YS, Hu ZC, Gao S et al. In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an inernal standard[J]. Chem. Geol.,2008,257(1-2):34-43.
[8] Riley T R,Leat P T,Pankhurst R J,et al.Origins of large volume Rhyolitic volcanism in the Antarctic peninsula and patag-onia by crustal melting[J]. Journal of Petrology, 2001,42(6):1043-1065.
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[11]郭锋,范蔚茗,王岳军,等.大兴安岭南段晚中生代双峰式火山作用[J].岩石学报, 2001, 17(1):161-168.
[12]高晓峰,郭峰,李超文,等.溧水盆地两类晚中生代中酸性火山岩的岩石成因[J].岩石矿物学杂志,2007,26(1):1-12.
[13]李献华,周汉文,李正祥,等.川西新元古代双峰式火山岩成因的微量元素和Sm-Nd同位素制约及其大地构造意义[J].地质科学.2002,37(3):264-276.
[14]刘红涛,翟明国,刘建明,等.华北克拉通北缘中生代花岗岩:从碰撞后到非造山[J].岩石学报, 2002, 18(4):433-448.
[15]苏春乾,姜长义,夏哲明,等.北天门山东段阿奇山组火山岩的地球化学特征及锆石U-Pb年龄[J].岩石学报,2009,25(4):901-915.
[16]屈涛,王哲,李平,等.中天山道尔都达坂一带侵入岩地球化学特征及构造意义[J].新疆地质,2017,35(4):426-434.
[2] Briand B, Bouchardon J, Capiez P, et al.Felsic(A-type)-basic(plume-induced)Early Palaeozoic bimodal magmat-ism in the Maures massif[J].Geol.l,2002,139(3):291-311.
[3] Liu YS, Gao S, Hu Z et al. Continental and oceanic crust recycling-induced melt-peridotite ineractions in the Trans-North China Oregen:U-Pb dating, Hf isotopes and trace elements in zircons of mantle xenoliths[J]. Journal of Petrology, 2010, 51(1-2):537-571.
[4] Pearce, J.A. Tectonic implications of the composition of volcanic arc magmas[J]. Earth and Planetary Science.1995,23:251-285.
[5] Green T H. Significance of Nb/Ta as an indicator of geochemical processes in the crust-mantle system[J]. Chemical Geology, 1995,120(3):347-359.
[6] Hildteth W, Moorbath S. Crustal contribution to arc magmatism in the Andes of Central Chile[J]. Contrib. Mineral. Petrol,1988,98:455-489.
[7] Liu YS, Hu ZC, Gao S et al. In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an inernal standard[J]. Chem. Geol.,2008,257(1-2):34-43.
[8] Riley T R,Leat P T,Pankhurst R J,et al.Origins of large volume Rhyolitic volcanism in the Antarctic peninsula and patag-onia by crustal melting[J]. Journal of Petrology, 2001,42(6):1043-1065.
[9] Shinjo R,Kato Y. Geochemical constraints on the origin of bimodal magmatism at the Okinawa Trough, an incipient back-arc basin[J].Lithos,2000,54:117-137.
[10] Turner S, Sandoford M,Foden J. Some geodynamic and compositional constraints on“postoroge-nic”magmatism[J].Geology,1992, 20:931-934.
[11]郭锋,范蔚茗,王岳军,等.大兴安岭南段晚中生代双峰式火山作用[J].岩石学报, 2001, 17(1):161-168.
[12]高晓峰,郭峰,李超文,等.溧水盆地两类晚中生代中酸性火山岩的岩石成因[J].岩石矿物学杂志,2007,26(1):1-12.
[13]李献华,周汉文,李正祥,等.川西新元古代双峰式火山岩成因的微量元素和Sm-Nd同位素制约及其大地构造意义[J].地质科学.2002,37(3):264-276.
[14]刘红涛,翟明国,刘建明,等.华北克拉通北缘中生代花岗岩:从碰撞后到非造山[J].岩石学报, 2002, 18(4):433-448.
[15]苏春乾,姜长义,夏哲明,等.北天门山东段阿奇山组火山岩的地球化学特征及锆石U-Pb年龄[J].岩石学报,2009,25(4):901-915.
[16]屈涛,王哲,李平,等.中天山道尔都达坂一带侵入岩地球化学特征及构造意义[J].新疆地质,2017,35(4):426-434.