新疆北山地区白山镁铁-超镁铁岩体LA-ICP-MS锆石U-Pb年龄、地球化学特征及其找矿意义Geochemistry and Zircon U-Pb Dating of the Baishan Mafic-Ultramafic Rock Complex in the Beishan Area of Xinjiang and Its Prospecting Significance
谢燮;李文明;孙吉明;李军;黄敏;
摘要(Abstract):
白山镁铁-超镁铁岩体为新疆北山地区新近发现的一处铜镍矿化镁铁-超镁铁岩体,岩体位于新疆北山裂谷带骆驼峰-矛头山断裂南侧,侵位于敦煌岩群,主要由纯橄岩、辉橄岩、橄长岩、橄榄辉长岩、橄榄苏长岩、苏长岩、辉长岩等组成。全岩成分以低碱、低钛为特征,岩浆演化过程中发生了橄榄石、单斜辉石和斜长石的分离结晶作用,经历了一定程度的地壳混染。通过LAICP-MS锆石U-Pb测年,首次获得白山岩体中橄榄苏长岩形成年龄为(298.4±3.3)Ma。该岩体地质学、岩相学、岩石地球化学特征,以及成岩时代均与区域内及东天山地区含矿岩体有较强的相似性,综合地物化信息显示,岩体具有较好的铜镍成矿潜力,其发现进一步证明新疆北山地区具有较大的铜镍找矿空间。
关键词(KeyWords): 锆石U-Pb年龄;地球化学特征;镁铁-超镁铁岩体;白山
基金项目(Foundation): 中国地质调查局项目“天山-北山成矿带那拉提-营毛沱地区地质矿产调查”(DD20160009)
作者(Author): 谢燮;李文明;孙吉明;李军;黄敏;
Email:
DOI: 10.19509/j.cnki.dzkq.2018.0602
参考文献(References):
- [1]孙赫,秦克章,徐兴旺,等.东天山镁铁质-超镁铁质岩带岩石特征及铜镍成矿作用[J].矿床地质,2007,26(1):198-209.
- [2]秦克章,唐冬梅,苏本勋,等.北疆二叠纪镁铁-超镁铁岩铜、镍矿床的构造背景、岩体类型、基本特征、相对剥蚀程度、含矿性评价标志及成矿潜力分析[J].西北地质,2012,45(4):83-116.
- [3] Ao S J,Xiao W J,Han C M,et al.Geochronology and geochemistry of Early Permian mafic-ultramafic complexes inthe Beishan area,Xinjiang,NW China[J].Gondwana Research,2010,18:466-478.
- [4] Qin K Z,Su B X,Sakyi P A,et al.SIMS Zircon U-Pb geochronology and Sr-Nd isotopes of Ni-Cu bearing maficultramaficintrusions in Eastern Tianshan and Beishan in correlation with flood basalts in Tarim Basin(NW China)[J].American Journal of Science,2011,311:237-260.
- [5]姜常义,程松林,叶书锋,等.新疆北山地区中坡山北镁铁质岩与岩石成因[J].岩石学报,2006,22(1):115-126.
- [6]苏本勋,秦克章,孙赫,等.新疆北山地区红石山镁铁-超镁铁岩体的岩石矿物学特征:对同化混染和结晶分异过程的启示[J].岩石学报,2009,25(4):873-887.
- [7] Su B X,Qin K Z,Sakyi P A,et al.Geochronologic-petrochemical studies of the Hongshishan mafic-ultramafic intrusion,Beishan of the Hongshishan mafic-ultramafic intrusion,Beishan area,Xinjiang(NW China):Petrogenesis and tectonic implications[J].International Geology Review,2012,54:270-289.
- [8]苏本勋,秦克章,孙赫,等.新疆北山地区旋窝岭镁铁-超镁铁岩体的年代学、岩石矿物学和地球化学研究[J].岩石学报,2010,26(11):3283-3294.
- [9]夏昭德,夏明哲,王垚,等.塔里木板块东北部笔架山东基性-超基性岩体地球化学特征与岩石成因[J].地质科技情报,2012,31(2):1-8.
- [10]凌锦兰,夏明哲,郭娜欣,等.新疆北山地区罗东镁铁质-超镁铁质层状岩体岩石成因[J].地球化学,2011,40(6):499-515.
- [11]校培喜,王兴安,王育习,等.笔架山幅1∶25万区域地质调查(修测)k46c004002[R].西安:西安地质矿产研究所,2005.
- [12]Sun S-S,McDonough W F.Chemical and isotope systematics of ocean basalts:Implications for mantle composition and processes[M]∥Saunders A D,Norry M J.Magmatism in the Ocean Basina.[S.l.]:Geol.Soc.Spec.Publ.42,1989:313-345.
- [13]Nasdala L,Hofmeist er W,Norberg N,et al.Zircon M257:A homogeneous natural reference material forthe ion microp robe U-Pb analysis of zi rcon[J].Geostandards and Geoanalytical Research,2008,32:247-265
- [14]Liu Y S,Hu Z C,Gao S,et al.In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal s tandard[J].Chemical Geology,2008,257:34-43.
- [15]谢燮,杨建国,王小红,等.甘肃北山红柳沟基性-超基性岩体SHRIMP锆石U-Pb年龄及其地质意义[J].中国地质,2015,42(2):396-405.
- [16]Hofmann W.Chemical differentiation of the earth:The relationship between mantle,continental crust and oceanic crust[J].Earth and Planetary Science Letters,1988,90:297-314.
- [17]Furman T Y,Bryce J G,Karson J,et al.East Africanrift system(EARS)plume structure:insight from Quaternary mafic lavas of Turkana,Kenya[J].Journal of Petrology,2004,45(5):1069-1088.
- [18]谢燮,杨建国,王小红,等.甘肃北山红柳沟基性-超基性岩体岩石成因及成矿条件[J].现代地质,2015,29(6):1259-1270.
- [19]汤庆艳,张铭杰,李文渊,等.新疆北山二叠纪大型镁铁-超镁铁质岩体的动力学背景及成矿潜力[J].中国地质,2015,42(3):468-481.
- [20]李华芹,陈富文,梅玉萍,等.新疆坡北基性-超基性岩带No.1号岩体Sm-Nd和SHRIMP U-Pb同位素年龄及其地质意义[J].矿床地质,2006,25(4):463-469.
- [21]李华芹,梅玉萍,屈文俊,等.新疆坡北基性-超基性岩带10号岩体SHRIMP U-Pb和矿石Re-Os同位素定年及其意义[J].矿床地质,2009,28(5):633-642.
- [22]Zhou M F,Lesher C M,Yang Z X,et al.Geochemistry and petrogenesis of 270Ma Ni-Cu-(PGE)sulfide-bearing mafic intrusions in the Huangshan District,eastern Xinjiang,Northwest China:Implications for the tectonic evolution of the Central Asian orogenic belt[J].Chemical Geology,2004,209(3/4):233-257.
- [23]颉炜,宋谢炎,聂晓勇,等.新疆坡十铜镍硫化物含矿岩体岩浆源区特征及背景探讨[J].地学前缘,2011,18(3):189-200.
- [24]Song X Y,Xie W,Deng Y F,et al.Slab break-off and the formation of Permian mafic-ultramafic intrusions in southern margin of Central Asian orogenic belt,Xinjiang,NW China[J].Lithos,2011,127:128-143.
- [25]Zhang Zhaochong,Mao Jingwen,Saunders A D,et al.Petrogenetic modeling of three mafic-ultramafic layered intrusions in the Emeishan large igneous province,SW China,based on isotopic and bulk chemical constraints[J].Lithos,2009,113(3/4):369-392.
- [26]Zhang Zhaochong,Mao Jingwen,Chai Fengmei,et al.Geochemistry of the Permian Kalatongke mafic intrusions,Northern Xinjiang,NW China:Implications for the genesis of the magmatic Ni-Cu sulfide deposit[J].Economic Geology,2009,104(2):185-203.
- [27]Naldrett A J.World-class Ni-Cu-PGE deposits:Key factors in their genesis[J].Mineralium Deposita,1999,34:227-240.
- [28]Naldrett A J.Secular variation of magmatic sulfide deposits and their source magmas[J].Economic Geology,2010,105(3):669-688.