粤东北柏埔地区燕山期小岩体地球化学特征与铀成矿探讨
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摘要
燕山期花岗岩小岩体的岩性为中粒黑云母二长花岗岩,出露于柏埔岩体北部黄田铀矿床南部约3 km的范围内。针对中粒黑云母二长花岗岩进行了主量元素、微量元素和稀土元素的分析。结果表明:该岩体表现为SiO_2质量分数高(73.07%～74.20%,平均为73.71%),富碱(Na_2O+K_2O=8.20%～8.78%,平均为8.57%),且钾大于钠,铝过饱和(A/CNK值0.99～1.06,平均为1.03)的特点,属钾玄岩系列。微量元素中,富集Rb、 Th、 U、 Sm,明显亏损Sr、 Ce和Ti。稀土元素特征中,重稀土分馏较弱,轻稀土分馏较强,配分曲线呈右倾型, Eu负异常(δEu=0.18～0.26)明显等特征。推测其形成于岩石圈伸展减薄的环境下,源区主要由泥质岩组成。Th/U比平均2.09,小于3,可为区内铀矿化的形成提供丰富的铀源。
Occurred in the north Bopu pluton about 3 km south of Huangtian uranium deposit, the lithology of the Yanshanian granitoid is biotite monzogranite. In this paper, the major elements, trace elements and rare earth elements of biotite monzogranite were analyzed. The results showed that the pluton is characterized by high SiO_2 content( 73.07% to 74.20%, average 73.71%), rich alkaline( Na_2O +K_2O =8.20% to 8.78%, average 8.57%) and potassium greater than sodium; and supersaturated aluminum( A/CNK value 0.99 to 1.06, average 1.03), which falls into potassium basalt series. Trace elements is rich in Rb, Th, U, Sm and obviously depleted in Sr, Ce and Ti. The REE showed week fraction in HREE and strong fraction in LREE, and distribution pattern is rightleaning and the strong Eu depletion(δEu=0.18 to 0.26). It is suggested that the monzogranite was formed in the lithospheric extension and thinning environment, and the source area was mainly composed of argillaceous rock. The Th/U ratio is 2.09 which may provide abundant uranium source for the formation of uranium mineralization in the area.
Occurred in the north Bopu pluton about 3 km south of Huangtian uranium deposit, the lithology of the Yanshanian granitoid is biotite monzogranite. In this paper, the major elements, trace elements and rare earth elements of biotite monzogranite were analyzed. The results showed that the pluton is characterized by high SiO_2 content( 73.07% to 74.20%, average 73.71%), rich alkaline( Na_2O +K_2O =8.20% to 8.78%, average 8.57%) and potassium greater than sodium; and supersaturated aluminum( A/CNK value 0.99 to 1.06, average 1.03), which falls into potassium basalt series. Trace elements is rich in Rb, Th, U, Sm and obviously depleted in Sr, Ce and Ti. The REE showed week fraction in HREE and strong fraction in LREE, and distribution pattern is rightleaning and the strong Eu depletion(δEu=0.18 to 0.26). It is suggested that the monzogranite was formed in the lithospheric extension and thinning environment, and the source area was mainly composed of argillaceous rock. The Th/U ratio is 2.09 which may provide abundant uranium source for the formation of uranium mineralization in the area.
引文
[1]唐湘生,聂斌,李嘉.武夷山成矿带铀成矿特征与找矿方向[J].铀矿地质,2011,27(2):69-73.
[2]杨华,杨仁广.河源盆地XX铀矿床成矿条件分析[J].四川建材,2011,37(4):95-96.
[3]陈祝海,郑明良,宋仕珠,等.广东河源成矿带铀资源现状及成矿潜力分析[J].铀矿地质,2008,24(2):108-111.
[4]林卜云.广东河源地区放射场特征初探[J].铀矿地质,1996,12(1):37-40.
[5]陈光远,孙岱生,邵伟.胶东郭家岭花岗闪长岩成因矿物学与金矿化[M].中国地质大学出版社,1993.
[6]邓军.胶东三山岛断裂带金成矿系统与资源勘查[M].地质出版社,2010.
[7]邓军,杨立强,王长明.三江特提斯复合造山与成矿作用研究进展[J].岩石学报,2011,27(9):2 501-2 509.
[8]刘国平,汪东波,祝新友,等.生产矿山深部及外围找矿潜力巨大:夹皮沟金矿区勘查历史的启示[J].地质与勘探,2001,37(2):37-40.
[9]杨立强,刘江涛,张闯,等.哀牢山造山型金成矿系统:复合造山构造演化与成矿作用初探[J].岩石学报,2010,26(6):1 723-1 739.
[10]杨立强,邓军,王中亮,等.胶东中生代金成矿系统[J].岩石学报,2014,30(9):2 447-2 467.
[11]Middlemost E A K.Naming materials in the magma/igneous rock system[J].Earth Science Reviews,1994,37(3-4):215-224.
[12]Peccerillo A,Taylor S R.Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area,Northern Turkey[J].Contributions to Mineralogy&Petrology,1976,58(1):63-81.
[13]陈小明,王汝成,刘昌实,等.广东从化佛冈(主体)黑云母花岗岩定年和成因[J].高校地质学报,2002,8(3):293-307.
[14]Setsuya Nakada and Masaki Takahashi.Regional variationin chemistry of the Miocene intermediate to felsic magmas in the Outer Zone and the Setouchi Province of Southwest Japan[J].The Geological Society of Japan,1979,85(9):571-582.
[15]Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[J].Geological Society,1989,42:313-345.
[16]高山,骆庭川,张本仁,等.中国东部地壳的结构和组成[J].中国科学,1999,29(3):204-213.
[17]Taylor S R,Mclennan.The geochemical evolution of the continental crust[J].Rev.Geophys,1995,33:241-265.
[18]高山,赵志丹,骆庭川,等.东秦岭河南伊川-湖北宜昌地学断面地壳岩石组成、化学成分及形成机制[J].岩石学报,1995,11(2):213-226.
[19]Taylor S R,Mclennan S M.The continental crust:its composition and evolution:an examination of the geochemical record preserved in sedimentary rocks[M].Oxford:Blackwell Scientific Pub,1985.
[20]郭春丽,郑佳浩,楼法生,等.华南印支期花岗岩类的岩石特征、成因类型及其构造动力学背景探讨[J].大地构造与成矿学,2012,36(3):457-472.
[21]黄国龙,曹豪杰,凌洪飞,等.粤北油洞岩体SHRIMP锆石U-Pb年龄、地球化学特征及其成因研究[J].地质学报,2012,86(4):577-586.
[22]黄国龙,刘鑫扬,孙立强,等.粤北长江岩体的锆石U-Pb定年、地球化学特征及其成因研究[J].地质学报,2014,88(5):836-849.
[23]Schreiber H D,Lauer H V and Thanyasir T.The redox state of cerium in basaltic magmas:An experimental study of iron￣cerium in teraction in silicate melts[J].Geochimica Cosmochimica Acta,1980,44:1 599-1 612.
[24]范蔚茗,王岳军,郭锋,等.湘赣地区中生代镁铁质岩浆作用与岩石圈伸展[J].地学前缘,2003,10(3):159-169.
[25]Mao J R,Ye H M,Liu K,et al.The collisionextension event between the South China Block and the Paleo-Pacific Plate:Evidence from Indosinian alkaline rocks in Dashuang,eastern Zhejiang[J].Lithos,2013,172:81-97.
[26]郭令智,施央申,马瑞士.西太平洋中、新生代活动大陆边缘和岛弧构造的形成及演化[J].地质学报,1983,57(1):13-23.
[27]Zhou X M,Li W X.Origin of Late Mesozoic igneous rocks in Southeastern China:Implications for lithosphere subduction and underplating of mafic magmas[J].Tectonophysics,2000,326(3):269-287.
[28]潘荣,朱筱敏,苏春乾,等.黑龙江伊春市北部白垩系美丰组钾玄岩系列的厘定及地球化学特征[J].高校地质学报,2013,19(2):316-326.
[29]王建,李建平,王江海.滇西大理-剑川地区钾玄质岩浆作用:后碰撞走滑拉伸环境岛弧型岩浆作用的地球化学研究[J].岩石学报,2003,19(1):61-70.
[30]Wang T,Guo L,Zheng Y D,et al.Timing and processes of late Mesozoic mid-lower-crustal extension in continental NE Asia and implications for the tectonic setting of the destruction of the North China Craton:mainly constrained by zircon U-Pb ages from metamorphic core complexes[J].Lithos,2012,154:315-245.
[31]Pearce J.Sources and Settings of Granitic Rocks[J].Episodes,1996,19(4):120-125.
[32]张祖还,章邦桐.华南产铀花岗岩及有关铀矿床研究[M].北京:原子能出版社,1991.
[33]窦小平.华东地区花岗岩类成因类型及其与铀成矿的关系[J].铀矿地质,2004,20(6):330-336.
[34]陈跃辉,陈祖伊,蔡煜琦,等.华东南中新生代伸展构造时空演化与铀矿化时空分在[J].铀矿地质,1997,13(3):128-138.
[35]李耀菘,朱杰辰,夏毓亮.锆石特征及铀含量在铀成矿远景评价中的意义[J].中国核科技报告,1995,(S2):283-297.
[2]杨华,杨仁广.河源盆地XX铀矿床成矿条件分析[J].四川建材,2011,37(4):95-96.
[3]陈祝海,郑明良,宋仕珠,等.广东河源成矿带铀资源现状及成矿潜力分析[J].铀矿地质,2008,24(2):108-111.
[4]林卜云.广东河源地区放射场特征初探[J].铀矿地质,1996,12(1):37-40.
[5]陈光远,孙岱生,邵伟.胶东郭家岭花岗闪长岩成因矿物学与金矿化[M].中国地质大学出版社,1993.
[6]邓军.胶东三山岛断裂带金成矿系统与资源勘查[M].地质出版社,2010.
[7]邓军,杨立强,王长明.三江特提斯复合造山与成矿作用研究进展[J].岩石学报,2011,27(9):2 501-2 509.
[8]刘国平,汪东波,祝新友,等.生产矿山深部及外围找矿潜力巨大:夹皮沟金矿区勘查历史的启示[J].地质与勘探,2001,37(2):37-40.
[9]杨立强,刘江涛,张闯,等.哀牢山造山型金成矿系统:复合造山构造演化与成矿作用初探[J].岩石学报,2010,26(6):1 723-1 739.
[10]杨立强,邓军,王中亮,等.胶东中生代金成矿系统[J].岩石学报,2014,30(9):2 447-2 467.
[11]Middlemost E A K.Naming materials in the magma/igneous rock system[J].Earth Science Reviews,1994,37(3-4):215-224.
[12]Peccerillo A,Taylor S R.Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area,Northern Turkey[J].Contributions to Mineralogy&Petrology,1976,58(1):63-81.
[13]陈小明,王汝成,刘昌实,等.广东从化佛冈(主体)黑云母花岗岩定年和成因[J].高校地质学报,2002,8(3):293-307.
[14]Setsuya Nakada and Masaki Takahashi.Regional variationin chemistry of the Miocene intermediate to felsic magmas in the Outer Zone and the Setouchi Province of Southwest Japan[J].The Geological Society of Japan,1979,85(9):571-582.
[15]Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[J].Geological Society,1989,42:313-345.
[16]高山,骆庭川,张本仁,等.中国东部地壳的结构和组成[J].中国科学,1999,29(3):204-213.
[17]Taylor S R,Mclennan.The geochemical evolution of the continental crust[J].Rev.Geophys,1995,33:241-265.
[18]高山,赵志丹,骆庭川,等.东秦岭河南伊川-湖北宜昌地学断面地壳岩石组成、化学成分及形成机制[J].岩石学报,1995,11(2):213-226.
[19]Taylor S R,Mclennan S M.The continental crust:its composition and evolution:an examination of the geochemical record preserved in sedimentary rocks[M].Oxford:Blackwell Scientific Pub,1985.
[20]郭春丽,郑佳浩,楼法生,等.华南印支期花岗岩类的岩石特征、成因类型及其构造动力学背景探讨[J].大地构造与成矿学,2012,36(3):457-472.
[21]黄国龙,曹豪杰,凌洪飞,等.粤北油洞岩体SHRIMP锆石U-Pb年龄、地球化学特征及其成因研究[J].地质学报,2012,86(4):577-586.
[22]黄国龙,刘鑫扬,孙立强,等.粤北长江岩体的锆石U-Pb定年、地球化学特征及其成因研究[J].地质学报,2014,88(5):836-849.
[23]Schreiber H D,Lauer H V and Thanyasir T.The redox state of cerium in basaltic magmas:An experimental study of iron￣cerium in teraction in silicate melts[J].Geochimica Cosmochimica Acta,1980,44:1 599-1 612.
[24]范蔚茗,王岳军,郭锋,等.湘赣地区中生代镁铁质岩浆作用与岩石圈伸展[J].地学前缘,2003,10(3):159-169.
[25]Mao J R,Ye H M,Liu K,et al.The collisionextension event between the South China Block and the Paleo-Pacific Plate:Evidence from Indosinian alkaline rocks in Dashuang,eastern Zhejiang[J].Lithos,2013,172:81-97.
[26]郭令智,施央申,马瑞士.西太平洋中、新生代活动大陆边缘和岛弧构造的形成及演化[J].地质学报,1983,57(1):13-23.
[27]Zhou X M,Li W X.Origin of Late Mesozoic igneous rocks in Southeastern China:Implications for lithosphere subduction and underplating of mafic magmas[J].Tectonophysics,2000,326(3):269-287.
[28]潘荣,朱筱敏,苏春乾,等.黑龙江伊春市北部白垩系美丰组钾玄岩系列的厘定及地球化学特征[J].高校地质学报,2013,19(2):316-326.
[29]王建,李建平,王江海.滇西大理-剑川地区钾玄质岩浆作用:后碰撞走滑拉伸环境岛弧型岩浆作用的地球化学研究[J].岩石学报,2003,19(1):61-70.
[30]Wang T,Guo L,Zheng Y D,et al.Timing and processes of late Mesozoic mid-lower-crustal extension in continental NE Asia and implications for the tectonic setting of the destruction of the North China Craton:mainly constrained by zircon U-Pb ages from metamorphic core complexes[J].Lithos,2012,154:315-245.
[31]Pearce J.Sources and Settings of Granitic Rocks[J].Episodes,1996,19(4):120-125.
[32]张祖还,章邦桐.华南产铀花岗岩及有关铀矿床研究[M].北京:原子能出版社,1991.
[33]窦小平.华东地区花岗岩类成因类型及其与铀成矿的关系[J].铀矿地质,2004,20(6):330-336.
[34]陈跃辉,陈祖伊,蔡煜琦,等.华东南中新生代伸展构造时空演化与铀矿化时空分在[J].铀矿地质,1997,13(3):128-138.
[35]李耀菘,朱杰辰,夏毓亮.锆石特征及铀含量在铀成矿远景评价中的意义[J].中国核科技报告,1995,(S2):283-297.
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