柴达木西北缘大通沟北山闪长岩体地球化学特征及年代学研究
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摘要
大通沟北山闪长岩体位于柴达木地块西北缘,侵位于新元古代地层,岩体具有较高的SiO_2、中等Al_2O_3,低MgO等特征,稀土元素配分曲线属轻稀土富集型,富集稀土元素及大离子亲石元素(Rb、K、Th),相对亏损高场强元素(Nb、P、Ti),负铕异常较明显。地球化学研究表明初始岩浆可能以地幔物质为主,岩浆经历了一定程度的结晶分异地壳混染。LA-ICP-MS锆石U-Pb测年表明其形成年龄为(362.3±4.9)Ma,为晚泥盆世岩浆活动的产物,形成于总体平稳持续的陆内演化伸展阶段。
The Datonggou Beishan diorite is located in the northwestern margin of the Qaidam block,is intruded into the Neoproterozoic formation.The rock is characterized by high SiO_2,medium Al_2O_3 and low MgO.The distribution curve of rare earth elements is a type of light rare earth enrichment type.The rock is enrichment of rare earth elements and large ion stone elements(Rb,Th,K),inadequate in high field strength elements(Nb,P,Ti),and with obvious negative europium anomaly.The result of the geochemical study showed that the primitive magma might be dominated by mantle material,the magma has undergone a certain degree of crystallization differentiation,and be crustal contamination.LA-ICP-MS zircon U-Pb dating showed that its formation age was(362.3+4.9)Ma,the product of Late Devonian magmatic activity and formed in a stable and continuous intracontinental evolution period.
The Datonggou Beishan diorite is located in the northwestern margin of the Qaidam block,is intruded into the Neoproterozoic formation.The rock is characterized by high SiO_2,medium Al_2O_3 and low MgO.The distribution curve of rare earth elements is a type of light rare earth enrichment type.The rock is enrichment of rare earth elements and large ion stone elements(Rb,Th,K),inadequate in high field strength elements(Nb,P,Ti),and with obvious negative europium anomaly.The result of the geochemical study showed that the primitive magma might be dominated by mantle material,the magma has undergone a certain degree of crystallization differentiation,and be crustal contamination.LA-ICP-MS zircon U-Pb dating showed that its formation age was(362.3+4.9)Ma,the product of Late Devonian magmatic activity and formed in a stable and continuous intracontinental evolution period.
引文
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[16]杨经绥,许志琴,张建新,等.中国主要高压-超高压变质带的大地构造背景及俯冲/折返机制的探讨[J].岩石学报,2009,25(7):1529-1560.
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[18]曹玉亭,刘良,王超,等.阿尔金南缘塔特勒克布拉克花岗岩的地球化学特征、锆石U-Pb定年及Hf同位素组成[J].岩石学报,2010,26(11):3259-3271.
[19]董增产,校培喜,奚仁刚,等.阿尔金南缘构造混杂岩带中角闪辉长岩地球化学特征及同位素测年[J].地质论评,2011,57(2):207-216.
[20]杨文强,刘良,丁海波,等.南阿尔金迪木那里克花岗岩地球化学、锆石U-Pb年代学与Hf同位素特征及其构造地质意义[J].岩石学报,2012,28(12):4139-4150.
[21]孙吉明,马中平,唐卓,等.阿尔金南缘鱼目泉岩浆混合花岗岩LA-ICP-MS测年与构造意义[J].地质学报,2012,86(2):247-257.
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[23] SUN S S AND MCDONOUGH W F.Chemical and isotopic systemmatics of oceanic basalts:implication for the mantle composition and process[M]//SAUNDER A D,NORRY M J.Magmatism in the ocean basins.Special Publication of Geological Society of London,1989,42:313-346.
[24] BOYNTON W V.Geochemistry of the Rare Earth Elements:Meteorite Study[M]//HENDERSON P.Rare Earth Element Geochemistry.Elsevier,1984:63-114.
[25] ATHERTON M P,PETFORD N.Generation of sodium-rich magmas from newly underplated basaltic crust[J].Nature,1993,362;144-146.
[26] HOFMANN A W,JOCHUM K P,SEUFERT M,et al.Nb and Pb in oceanic basalts:new constraints on mantle evolution[J].Earth and Planetary Science Letters,1986,79(1/2):33-45.
[27] BARBARIN B.A review of the relationships between granitoid types,their origins and their geodynamic environments[J].Lithos,1999,46:605-626.
[28] BARTH M G,MCDONOUGH W F,RUDNICK R L.Tracking the budget of Nb and Ta in thecontinental crust[J].Chemical Geology,2000,165:197-213.
[29] RUDNICK R L,GAO S.Composition of thecontinental crust[J].Treatise on Geochemistry,2003,3:1-64.
[30] SUN S S.Lead isotopic study of young volcanic rocks from mid-oceanridges,ocean islands and island arcs[J].Philosophical Transactions of the Royal Society of London.Series A,Mathematical and Physical Sciences,1980,297(1431):409-445.
[31] PICHER W S,COBBING E J.Ph anerozoic plutionism in the Peruvian edge[M]//Picher,et al.Magmatism at aplate edge,London:Blackie,1985,19-25.
[32]李荣社,计文化,赵振明,等.昆仑早古生代造山带研究进展[J].地质通报,2007,26(4):373-382.
[33]张雪亭,杨生德,杨站君.青海省板块构造研究:1∶100万青海省大地构造图说明书[M].北京:地质出版社,2007,1-221.
[34]张照伟,王亚磊,钱兵,等.东昆仑石头坑德镁铁-超镁铁质岩体矿物学特征及成矿指示[J].地质与勘探,2017,53(5):825-837.
[35]陆露,吴珍汉,胡道功,等.东昆仑牦牛山组流纹岩锆石U-Pb年龄及构造意义[J].岩石学报,2010,26(4):1150-1158.
[36]张耀玲,胡道功,石玉若,等.东昆仑造山带牦牛山组火山岩SHRIMP锆石U-Pb年龄及其构造意义[J].地质通报,2010,29(11):1614-1618.
[37]李荣社,计文化,陈守建,等.青藏高原及邻区古生代构造-岩相古地理图(1∶300万)[M].北京:地质出版社,2011:1-306.
[38]李世金.祁连造山带地球动力学演化与内生金属矿产成矿作用研究[D].长春:吉林大学,2011.
[39]孙娇鹏,陈世悦,马寅生,等.柴达木盆地北缘早奥陶世陆-弧碰撞及弧后前陆盆地:来自碎屑岩地球化学的证据[J].地质学报,2016,90(1):80-92.
[40]李睿华.青海茫崖牛鼻子梁镍矿床地质特征及矿化富集规律研究[D].长春:吉林大学,2015.
[41]凌锦兰,赵彦锋,康珍,等.柴达木地块北缘牛鼻子梁镁铁质-超镁铁质岩体岩石成因与成矿条件[J].岩石学报,2014,30(6):1628-1646.
[2] SONG S G,ZHANG L F,NIU Y L,et al.Geochronology of diamond-bearing zircons from garnet peridotite in the North Qaidam UHPM belt,Northern Tibetan Plateau:a record of complex histories from oceanic lithosphere subduction to continental collision[J].Earth&Planetary Science Letters,2005,234(1):99-118.
[3]赖绍聪,邓晋福,赵海玲.柴达木北缘古生代蛇绿岩及其构造意义[J].现代地质,1996,10(1):18-28.
[4]于胜尧,张建新,李金平.柴北缘都兰高压麻粒岩的变质演化及形成的动力学背景[J].岩石学报,2009,25(9):2224-2234.
[5]宋述光,张聪,李献华,等.柴北缘超高压带中锡铁山榴辉岩的变质时代[J].岩石学报,2011,27(4):1191-1197.
[6]张贵宾,张立飞.柴北缘沙柳河地区洋壳超高压变质单元中异剥钙榴岩的发现及其地质意义[J].地学前缘,2011,18(2):151-157.
[7]刘良,孙勇,肖培喜,等.阿尔金发现超高压(>3.8GPa)石榴二辉橄榄岩[J].科学通报,2002,47(9):657-662.
[8]刘良,陈丹玲,张安达.阿尔金超高压(>7GPa)片麻状(含)钾长石榴辉石岩-石榴子石出溶单斜辉石的证据[J].中国科学:D辑,2005,35(2):105-114.
[9]刘良,张安达,陈丹玲,等.阿尔金江尕勒萨依榴辉岩和围岩锆石LA-ICP-MS微区原位定年及其地质意义[J].地学前缘,2007,14(1):98-107.
[10]张建新,许志琴,杨经绥,等.阿尔金西段榴辉岩岩石学、地球化学和同位素年代学研究及其构造意义[J].地质学报,2001,75(2):186-197.
[11]张建新,杨经绥,许志琴,等.阿尔金榴辉岩中超高压变质作用证据[J].科学通报,2002,47(3):231-234.
[12]张建新,孟繁聪,MATTINSON C G.南阿尔金—柴北缘高压-超高压变质带研究进展、问题及挑战[J].高校地质学报,2007,13(3):526-545.
[13]刘永顺,于海峰,辛后田,等.阿尔金山地区构造单元划分和前寒武纪重要地质事件[J].地质通报,2009,28(10):1430-1438.
[14]刘永顺,于海峰,修群业,等.南阿尔金地区榴辉岩特征及意义[J].岩石矿物学杂志,2010,29(2):166-174.
[15]李向民,马中平,孙吉明,等.阿尔金断裂南缘约马克其镁铁-超镁铁岩的性质和年代学研究[J].岩石学报,2009,25(4):862-872.
[16]杨经绥,许志琴,张建新,等.中国主要高压-超高压变质带的大地构造背景及俯冲/折返机制的探讨[J].岩石学报,2009,25(7):1529-1560.
[17]马中平,李向民,孙吉明,等.阿尔金山南缘长沙沟镁铁-超镁铁质层状杂岩体的发现与地质意义:岩石学和地球化学初步研究[J].岩石学报,2009,25(4):793-804.
[18]曹玉亭,刘良,王超,等.阿尔金南缘塔特勒克布拉克花岗岩的地球化学特征、锆石U-Pb定年及Hf同位素组成[J].岩石学报,2010,26(11):3259-3271.
[19]董增产,校培喜,奚仁刚,等.阿尔金南缘构造混杂岩带中角闪辉长岩地球化学特征及同位素测年[J].地质论评,2011,57(2):207-216.
[20]杨文强,刘良,丁海波,等.南阿尔金迪木那里克花岗岩地球化学、锆石U-Pb年代学与Hf同位素特征及其构造地质意义[J].岩石学报,2012,28(12):4139-4150.
[21]孙吉明,马中平,唐卓,等.阿尔金南缘鱼目泉岩浆混合花岗岩LA-ICP-MS测年与构造意义[J].地质学报,2012,86(2):247-257.
[22] RICHWOOD P C.Boundary lines within petrologic diagrams which use oxides of major and minor elements[J].Lithos,1989,22:247-263.
[23] SUN S S AND MCDONOUGH W F.Chemical and isotopic systemmatics of oceanic basalts:implication for the mantle composition and process[M]//SAUNDER A D,NORRY M J.Magmatism in the ocean basins.Special Publication of Geological Society of London,1989,42:313-346.
[24] BOYNTON W V.Geochemistry of the Rare Earth Elements:Meteorite Study[M]//HENDERSON P.Rare Earth Element Geochemistry.Elsevier,1984:63-114.
[25] ATHERTON M P,PETFORD N.Generation of sodium-rich magmas from newly underplated basaltic crust[J].Nature,1993,362;144-146.
[26] HOFMANN A W,JOCHUM K P,SEUFERT M,et al.Nb and Pb in oceanic basalts:new constraints on mantle evolution[J].Earth and Planetary Science Letters,1986,79(1/2):33-45.
[27] BARBARIN B.A review of the relationships between granitoid types,their origins and their geodynamic environments[J].Lithos,1999,46:605-626.
[28] BARTH M G,MCDONOUGH W F,RUDNICK R L.Tracking the budget of Nb and Ta in thecontinental crust[J].Chemical Geology,2000,165:197-213.
[29] RUDNICK R L,GAO S.Composition of thecontinental crust[J].Treatise on Geochemistry,2003,3:1-64.
[30] SUN S S.Lead isotopic study of young volcanic rocks from mid-oceanridges,ocean islands and island arcs[J].Philosophical Transactions of the Royal Society of London.Series A,Mathematical and Physical Sciences,1980,297(1431):409-445.
[31] PICHER W S,COBBING E J.Ph anerozoic plutionism in the Peruvian edge[M]//Picher,et al.Magmatism at aplate edge,London:Blackie,1985,19-25.
[32]李荣社,计文化,赵振明,等.昆仑早古生代造山带研究进展[J].地质通报,2007,26(4):373-382.
[33]张雪亭,杨生德,杨站君.青海省板块构造研究:1∶100万青海省大地构造图说明书[M].北京:地质出版社,2007,1-221.
[34]张照伟,王亚磊,钱兵,等.东昆仑石头坑德镁铁-超镁铁质岩体矿物学特征及成矿指示[J].地质与勘探,2017,53(5):825-837.
[35]陆露,吴珍汉,胡道功,等.东昆仑牦牛山组流纹岩锆石U-Pb年龄及构造意义[J].岩石学报,2010,26(4):1150-1158.
[36]张耀玲,胡道功,石玉若,等.东昆仑造山带牦牛山组火山岩SHRIMP锆石U-Pb年龄及其构造意义[J].地质通报,2010,29(11):1614-1618.
[37]李荣社,计文化,陈守建,等.青藏高原及邻区古生代构造-岩相古地理图(1∶300万)[M].北京:地质出版社,2011:1-306.
[38]李世金.祁连造山带地球动力学演化与内生金属矿产成矿作用研究[D].长春:吉林大学,2011.
[39]孙娇鹏,陈世悦,马寅生,等.柴达木盆地北缘早奥陶世陆-弧碰撞及弧后前陆盆地:来自碎屑岩地球化学的证据[J].地质学报,2016,90(1):80-92.
[40]李睿华.青海茫崖牛鼻子梁镍矿床地质特征及矿化富集规律研究[D].长春:吉林大学,2015.
[41]凌锦兰,赵彦锋,康珍,等.柴达木地块北缘牛鼻子梁镁铁质-超镁铁质岩体岩石成因与成矿条件[J].岩石学报,2014,30(6):1628-1646.