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Geochemical Characters and Petrogenesis of the Bijiashandong Basic-Ultrabasic Intrusion,NE Tarim Plate
夏昭德;夏明哲;王垚;姜常义;凌锦兰;
摘要(Abstract):
笔架山东基性-超基性岩体位于塔里木板块东北部的新疆北山地区,是笔架山岩带中最东边的一个岩体,岩体形态为椭圆状,出露面积约5km2。由含长单辉橄榄岩、橄榄辉长岩、含橄辉长岩、辉长岩以及辉绿岩组成。含橄榄石较多的岩石属拉斑玄武岩系列,而辉长岩属钙碱性系列。岩相学、岩石化学和微量元素地球化学特征表明岩浆演化过程中经历了橄榄石、辉石、斜长石的分离结晶作用。Nd、Sr、Pb同位素组成和岩石地球化学特征反映出岩浆与围岩之间存在物质交换。笔架山东岩体的岩浆源区为OIB型地幔源区,原生岩浆为高镁拉斑玄武岩浆[w(MgO)=11.2%],这些性质与塔里木板块东北部其他基性-超基性岩体的特征相似,表明塔里木板块东北部二叠纪基性-超基性岩体的源区主要为OIB型地幔,可能与地幔柱有关。
关键词(KeyWords): 笔架山东岩体;同化混染;分离结晶;岩浆源区;新疆
基金项目(Foundation): 国家自然基金项目(40872070);; 中国地质调查局地质调查项目(1212011120498);; 中央高校基本科研业务费专项资金(CHD2010ZY008)
作者(Author): 夏昭德;夏明哲;王垚;姜常义;凌锦兰;
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参考文献(References):
- [1]Ao S J,Xiao W J,Han C M,et al.Geochronology and geo-chemistry of Early Permian mafic-ultramafic complexes in theBeishan area,Xinjiang,NW China:Implications for Late Pa-leozoic tectonic evolution of the southern Altaids[J].Gond-wana Research,2010,18:466-478.
- [2]姜常义,程松林,叶书锋,等.新疆北山地区中坡山北镁铁质岩体岩石地球化学与岩石成因[J].岩石学报,2006,22(1):115-126.
- [3]李华芹,陈富文,梅玉萍,等.新疆坡北基性-超基性岩带1号岩体Sm-Nd和SHRIMP U-Pb同位素年龄及其意义[J].矿床地质,2006,25(4):463-470.
- [4]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):633-643.
- [5]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.
- [6]Su B X,Qin K Z,Sakyi P A,et al.Geochronologic-petrochem-ical studies of the Hongshishan mafic-ultramafic intrusion,Beishan area,Xinjiang(NW China):Petrogenesis and tectonicimplications[J].International Geology Review,2012,54(3):270-289.
- [7]Qin K Z,Su B X,Sakyi P A,et al.SIMS zircon U-Pb geo-chronology and Sr-Nd isotopes of Ni-Cu-bearing mafic-ultra-mafic intrusions in Eastern Tianshan and Beishan in correlationwith flood basalts in Tarim Basin(NW China):Constraints ana CA.280Ma mantle plume[J].American Journal of Science,2011,311(3):237-260.
- [8]肖渊甫,王道永,吴德超,等.新疆北山构造带西段地质演化[M].成都:四川科学出版社,新疆科技卫生出版社,2000:113-139.
- [9]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.
- [10]赵鹏大,胡旺亮.北山远景成矿区地物化综合研究与找矿靶区圈定[R].1995.
- [11]吴利仁.论中国基性、超基性岩的成矿专属性[J].地质科学,1963(1):29-41.
- [12]Miyashiro A.Classification,characteristics and origin of ophi-olites[J].Journal of Geology,1974,83:249-281.
- [13]McDonough W F,Sun S S.The composition of the Earth[J].Chemical Geology,1995,120:223-253.
- [14]Zindler A,Hart S R.Chemical geodynamics[J].Annual Re-view of Earth and Planetary Sciences,1986,14:493-571.
- [15]Thorpe R S,Francis P W,O’Callagham L.Relative role ofsource compositions,fractional crystallization and crustal con-tamination in the petrogenesis of Andean volcanic rocks[J].Philosophical Transactions of the Royal Society of London,1984,310:675-692.
- [16]Spera F J,Bohrson W A.Open-system magma chamber evolu-tion:An energy-constrained geochemical model incorporatingthe effects of concurrent eruption,recharge,variable assimila-tion and fractional crystallization(Ec-E’RAxFC)[J].Journalof Petrology,2004,45:2459-2480.
- [17]Mckenzie D,Bickle M J.The volume and composition of meltgenerated by extension of the lithosphere[J].Journal of Geol-ogy,1988,29:625-679.
- [18]Baker J A,Menzies M A,Thirlwall M F,et al.Petrogenesisof Quaternary intraplate volcanism,Sana’a Yenmen:Implica-tion and polybaric melt hybridization[J].Journal of Petrolo-gy,1997,38:1359-1390.
- [19]Campbell I H,Griffiths R W.The evolution of mantle’schemical structure[J].Lithos,1993,30:389-399.
- [20]Hofmann W.Chemical differentiation of the earth:The rela-tionship between mantle,continental crust,and oceanic crust[J].Earth and Planetary Science Letters,1988,90:297-314.
- [21]Hunter A G.Intracrustal controls on the coexistence of tholei-itic and calc-alkaline magma series at Aso Volcano,SW Japan[J].Journal of Petrology,1998,39:1255-1284.
- [22]Arculus R J,Johnson R W.Island-arc magma sources:A geo-chemical assessment of the roles of slab-derived componentsand crustal contamination[J].Geochemical Journal,1981,15:109-133.
- [23]Green D H.Genesis of archean peridotitic magmas and con-straints on archean geothermal gradients and tectonics[J].Geology,1975,3:15-18.
- [24]Sato H.Nickel content of basaltic magmas:Identification ofprimary magmas and a measure of the degree of olivine frac-tionation[J].Lithos,1977,10:113-120.
- [25]Frey F A,Green D H,Roy S D.Integrated models of basaltpetrogenesis:A study of quartz tholeiites to olivine melilitiesfrom southeastern Australia utilizing geochemical and experi-mental petrological data[J].Journal of Petrology,1978,19:463-513.
- [26]Hess P C.Phase equilibria constraints on the origin of oceanfloor basalts[C]∥Morgan J P,Blackman D K,Sinton J M.Mantle flow and melt generation at mid-ocean ridges.[S.l.]:Geophysical Monograph,American Geophysical Union.,1992:67-102.
- [27]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.