摘要
班公湖-怒江缝合带中广泛分布早白垩世安山岩,其中碰撞后地壳增生所产生的安山岩对于青藏高原隆升研究具有重要的意义。赞宗错安山岩位于班公湖-怒江缝合带中段下白垩统去申拉组陆相红层中,锆石U-Pb年龄结果表明安山岩形成于113. 44±0. 88Ma~115. 00±0. 51Ma,属早白垩世晚期。岩石地球化学分析结果表明赞宗错安山岩属高钾钙碱性系列,富集大离子亲石元素和轻稀土元素,亏损高场强元素和重稀土元素。同时,安山岩εNd(t)为-3. 56~-1. 40,(87Sr/86Sr)i相对恒定(0. 7069~0. 7079),εHf(t)值为较小的正负值(-3. 66~6. 05)。Sr-Nd-Pb同位素和锆石Hf同位素显示安山岩来自幔源玄武质岩浆上涌造成的镁铁质下地壳部分重熔,为碰撞后地壳增生、下地壳重熔的产物,同时有幔源物质加入,指示了青藏高原中部地壳加厚及隆升。结合拉萨-南羌塘地块碰撞时间,推断赞宗错安山岩发育年代代表了高原中部早期隆升时间。本文为探讨青藏高原早期隆升提供了物质记录和有力证据。
The andesites formed by the crustal hyperplasia after the collision of Lhasa terrane and South Qiangtang terrane is of great significance to the uplift of Qinghai-Tibet Plateau. In the middle segment of the Banggong-Nujiang suture zone,Zanzong Co andesites located in the terrestrial red beds of the Lower Cretaceous,provide a record for the early uplift of the Qinghai-Tibet Plateau. Major and trace element,Sr-Nd-Pb and zircon U-Pb and Hf isotope data are presented for the newly discovered Zanzong Co andesites. These results offer new insights into the evolution of the Tibetan Plateau during Cretaceous. Zircon U-Pb dating constrains the timing of emplacement as Early Cretaceous( 113. 44 ± 0. 88 Ma ~ 115. 00 ± 0. 51 Ma) Geochemistry shows that the Zanzong Co andesites belong to high-K calc-alkaline series,and that all the samples are enriched in large ion lithophile elements( LILE) and light rare earth elements( LREE),and depleted in high field strength elements( HFSE) and heavy rare earth elements( HREE). Furthermore,the andesites display negative εNd( t)(-3. 56 ~-1. 40),relatively constant87 Sr/86 Sr ratios( 0. 7069 ~ 0. 7079) and small oscillation with positive or negative εHf( t) values(-3. 66 ~ 6. 05). The Sr-Nd-Pb and Hf isotope signature suggest that the andesites were derived from the anatexis of mafic lower crust by intrusion or underplating of mantle-derived basaltic magma,and were the products of the crust hyperplasia and the remelting of lower crust and mantle material after the collision,indicating the crust thickening and uplift in the central Qinghai-Tibet Plateau. Based on the published collision time between Lhasa terrane and South Qiangtang terrane,it is inferred that the age of andesites represents the early uplift of the central part of Qinghai-Tibet Plateau. The study of Zanzong Co andesites provides robust evidence for the early uplift of the central Qinghai-Tibetan Plateau in the late Early Cretaceous.
引文
Allègre CJ and Minster JF.1978.Quantitative models of trace element behavior in magmatic processes.Earth and Planetary Science Letters,38(1):1-25
Baker J and Waight TE.2002.Pb isotope analysis using Tl and a Pb-207-Pb-204 spike on a double focusing MC-ICPMS.Geochimica et Cosmochimica Acta,66(15A):A44
Bird P.1979.Continental delamination and the Colorado Plateau.Journal of Geophysical Research:Solid Earth,84(B13):7561-7571
Boettcher AL.1973.Volcanism and orogenic belts:The origin of andesites.Tectonophysics,17(3):223-240
Bonin B.2004.Do coeval mafic and felsic magmas in post-collisional to within-plate regimes necessarily imply two contrasting,mantle and crustal,sources?A review.Lithos,78(1-2):1-24
Boynton WV.1984.Cosmochemistry of the rare earth elements:Meteorite studies.Developments in Geochemistry,2:63-114
Burg JP and Chen GM.1984.Tectonics and structural zonation of southern Tibet,China.Nature,311(5983):219-223
Chapman JB,Ducea MN,Decelles PG and Profeta L.2015.Tracking changes in crustal thickness during orogenic evolution with Sr/Y:An example from the North American Cordillera.Geology,43(10):919-922
Chi XG,Li C and Jin W.2005.Cenozoic volcanism and lithospheric tectonic evolution in Qiangtang area,northern Qinghai-Tibet Plateau.Science in China(Series D),48(7):1011-1024
Condie KC.2005.High field strength element ratios in Archean basalts:A window to evolving sources of mantle plumes?Lithos,79(3-4):491-504
Defant MJ and Drummond MS.1990.Derivation of some modern arc magmas by melting of young subducted lithosphere.Nature,347(6294):662-665
Dewey JF,Shackleton RM,Chang CF and Sun YY.1988.The tectonic evolution of the Tibetan Plateau.Philosophical Transactions of the Royal Society A:Mathematical,Physical and Engineering Sciences,327(1594):379-413
Ding L,Kapp P,Yue YH and Lai QZ.2007.Postcollisional Calcalkaline lavas and xenoliths from the southern Qiangtang terrane,central Tibet.Earth and Planetary Science Letters,254(1-2):28-38
Fan JJ,Li C,Xie CM,Wang M and Chen JW.2015.Petrology and U-Pb zircon geochronology of bimodal volcanic rocks from the Maierze Group,northern Tibet:Constraints on the timing of closure of the Banggong-Nujiang Ocean.Lithos,227:148-160
Gao S,Liu XM,Yuan HL,Hattendorf B,Günther D,Chen L and Hu SH.2002.Determination of forty-two major and trace elements in USGS and NIST SRM glasses by laser ablation-inductively coupled plasma-mass spectrometry.Geostandards Newsletter,26(2):181-196
Grove T,Parman S,Bowring S,Price R and Baker M.2002.The role of an H2O-rich fluid component in the generation of primitive basaltic andesites and andesites from the Mt.Shasta region,N California.Contributions to Mineralogy and Petrology,142(4):375-396
Grove TL and Kinzler RJ.1986.Petrogenesis of andesites.AnnualReview of Earth and Planetary Sciences,14:417-454
Guynn JH,Kapp P,Pullen A,Heizler M,Gehrels G and Ding L.2006.Tibetan basement rocks near Amdo reveal“missing”Mesozoic tectonism along the Bangong suture,central Tibet.Geology,34(6):505-508
Hastie AR,Kerr AC,Pearce JA and Mitchell SF.2007.Classification of altered volcanic island arc rocks using immobile trace elements:Development of the Th-Co discrimination diagram.Journal of Petrology,48(12):2341-2357
Hawkesworth CJ,Gallagher K,Hergt JM and McD ermott F.1993.Mantle and slab contributions in ARC magmas.Annual Review of Earth and Planetary Sciences,21:175-204
Hofmann AW,Jochum KP,Seufert M and White WM.1986.Nb and Pb in oceanic basalts:New constraints on mantle evolution.Earth and Planetary Science Letters,79(1-2):33-45
Hoskin PWO and Black LP.2000.Metamorphic zircon formation by solid-state recrystallization of protolith igneous zircon.Journal of Metamorphic Geology,18(4):423-439
Hou KJ,Li YH and Tian YR.2009.In situ U-Pb zircon dating using laser ablation-multi ion counting-ICP-MS.Mineral Deposits,28(4):481-492(in Chinese with English abstract)
Hu PY,Zhai QG,Jahn BM,Wang J,Li C,Chung SL,Lee HY and Tang SH.2017.Late Early Cretaceous magmatic rocks(118~113Ma)in the middle segment of the Bangong-Nujiang suture zone,Tibetan Plateau:Evidence of lithospheric delamination.Gondwana Research,44:116-138
Kapp P,Yin A,Manning CE,Harrison TM,Taylor MH and Ding L.2003.Tectonic evolution of the Early Mesozoic blueschist-bearing Qiangtang metamorphic belt,central Tibet.Tectonics,22(4):17
Kapp P,Yin A,Harrison TM and Ding L.2005.Cretaceous-Tertiary shortening,basin development,and volcanism in central Tibet.Geological Society of America Bulletin,117(7-8):865-878
Kapp P,DeC elles PG,Gehrels GE,Heizler M and Ding L.2007.Geological records of the Lhasa-Qiangtang and Indo-Asian collisions in the Nima area of central Tibet.Geological Society of America Bulletin,119(7-8):917-933
Keto LS and Jacobsen SB.1987.Nd and Sr isotopic variations of Early Paleozoic oceans.Earth and Planetary Science Letters,84(1):27-41
Kuno H.1968.Origin of andesite and its bearing on the Island arc structure.Bulletin Volcanologique,32(1):141-176
Lai SC,Liu CY and Yi HS.2003.Geochemistry and Petrogenesis of Cenozoic andesite-dacite associations from the Hoh Xil Region,Tibetan Plateau.International Geology Review,45(11):998-1019
Li XH,Long WG,Li QL,Liu Y,Zheng YF,Yang YH,Chamberlain KR,Wan DF,Guo CH,Wang XC and Tao H.2010.Penglai zircon megacrysts:A potential new working reference material for Microbeam determination of Hf-O isotopes and U-Pb age.Geostandards and Geoanalytical Research,34(2):117-134
Li YL,He J,Wang CS,Santosh M,Dai JE,Zhang YX,Wei YS and Wang JG.2013.Late Cretaceous K-rich magmatism in central Tibet:Evidence for early elevation of the Tibetan Plateau?Lithos,160-161:1-13
Lin B,Tang JX,Chen YC,Baker M,Song Y,Yang HH,Wang Q,He W,and Liu ZB.2019.Geology and geochronology of Naruo large porphyry-breccia Cu deposit in the Duolong district,Tibet.Gondwana Research,66:168-182
Liu DL,Huang QS,Fan SQ,Zhang LY,Shi RD and Ding L.2014.Subduction of the Bangong-Nujiang Ocean:Constraints from granites in the Bangong Co area,Tibet.Geological Journal,49(2):188-206
Liu XM,Gao S,Yuan HL,Hattendorf B,Gunther D,Chen L and Hu SH.2002.Analysis of 42 major and trace elements in glass standard reference materials by 193nm LA-ICPMS.Acta Petrologica Sinica,18(3):408-418(in Chinese with English abstract)
Liu YS,Gao S,Hu ZC,Gao CG,Zong KQ and Wang DB.2010.Continental and oceanic crust recycling-induced melt-peridotiteinteractions in the trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths.Journal of Petrology,51(1-2):537-571
Ludwig KR.2003.User’s manual for Isoplot 3.6:A geochronological toolkit for microsoft excel.Berkeley CA,USA:Berkeley Geochronology Center
Lustrino M.2005.How the delamination and detachment of lower crust can influence basaltic magmatism.Earth-Science Reviews,72(1-2):21-38
Mantle GW and Collins WJ.2008.Quantifying crustal thickness variations in evolving orogens:Correlation between arc basalt composition and Moho depth.Geology,36(1):87-90
Murphy MA,Yin A,Harrison TM,Dürr SB,Chen Z,Ryerson FJ,Kidd WSF,Wang X and Zhou X.1997.Did the Indo-Asian collision alone create the Tibetan Plateau?Geology,25(8):719-722
Pan GT,Zhu DC,Wang LQ,Liao ZL,Geng QR and Jiang XS.2004.Bangong Lake-Nu River suture zone,the northern boundary of Gondwanaland:Evidence from geology and geophysics.Earth Science Frontiers,11(4):371-382(in Chinese with English abstract)
Pan GT,Wang LQ,Li RS,Yuan SH,Ji WH,Yin FG,Zhang WP and Wang BD.2012.Tectonic evolution of the Qinghai-Tibet Plateau.Journal of Asian Earth Sciences,53:3-14
Pearce JA,Harris NBW and Tindle AG.1984.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks.Journal of Petrology,25(4):956-983
Profeta L,Ducea MN,Chapman JB,Paterson SR,Gonzales SM,Kirsch M,Petrescu L and DeC elles PG.2015.Quantifying crustal thickness over time in magmatic arcs.Scientific Reports,5:17786
Qu XM,Wang RJ,Xin HB,Jiang JH and Chen H.2012.Age and petrogenesis of A-type granites in the middle segment of the Bangonghu-Nujiang suture,Tibetan Plateau.Lithos,146-147:264-275
Song HL,Zhang CH and Wang GH.2013.Structural Geology.Beijing:Geological Publishing House(in Chinese)
Song Y,Yang C,Wei SG,Yang HH,Fang X and Lu HT.2018.Tectonic control,reconstruction and preservation of the Tiegelongnan porphyry and epithermal overprinting Cu(Au)deposit,central Tibet,China.Minerals,8(9):398
Sun SS and McD onough WF.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.In:Saunders AD and Norry MJ(eds.).Magmatism in the Ocean Basins.Geological Society,London,Special Publication,42(1):313-345
Tang JX,Song Y,Wang Q,Lin B,Yang C,Guo N,Fang X,Yang HH,Wang YY,Gao K,Ding S,Zhang Z,Duan JL,Chen HQ,Su DK,Feng J,Liu ZB,Wei SG,He W,Song JL,Li YB and Wei LJ.2016.Geological characteristics and exploration model of the Tiegelongnan Cu(Au-Ag)deposit:The first ten million tons metal resources of a porphyry-epithermal deposit in Tibet.Acta Geoscientia Sinica,37(6):663-690(in Chinese with English abstract)
Tatsumi Y,Takahashi T,Hirahara Y,Chang Q,Miyazaki T,Kimura JI,Ban M and Sakayori A.2008.New insights into andesite genesis:The role of mantle-derived calc-alkalic and crust-derived tholeiitic melts in magma differentiation beneath Zao volcano,NE Japan.Journal of Petrology,49(11):1971-2008
Volkmer JE,Kapp P,Guynn JH and Lai QZ.2007.Cretaceous-Tertiary structural evolution of the north central Lhasa terrane,Tibet.Tectonics,26(6):TC6007
Wang C,Liang XQ,Xie YH,Tong CX,Pei JX,Zhou Y,Jiang Y,Fu JG and Wen SN.2015.Late Miocene provenance change on the eastern margin of the Yinggehai-Song Hong Basin,South China Sea:Evidence from U-Pb dating and Hf isotope analyses of detrital zircons.Marine and Petroleum Geology,61:123-139
Wang CS,Zhu LD and Liu ZF.2004.Tectonic and sedimentary evolution of basins in the north of Qinghai-Tibet Plateau and northward growing process of Qinghai-Tibet Plateau.Advance in Earth Sciences,19(3):373-381(in Chinese with English abstract)
Wang WL,Cheng QM,Zhang SY and Zhao J.2018.Anisotropic singularity:A novel way to characterize controlling effects of geological processes on mineralization.Journal of Geochemical Exploration,189:32-41
Winchester JA and Floyd PA.1977.Geochemical discrimination of different magma series and their differentiation products using immobile elements.Chemical Geology,20:325-343
Wu FY,Yang YH,Xie LW,Yang JH and Xu P.2006.Hf isotopic compositions of the standard zircons and baddeleyites used in U-Pb geochronology.Chemical Geology,234(1-2):105-126
Xie GQ,Mao JW,Wang RT,Meng DM,Sun J,Dai JZ,Ren T,Li JBand Zhao HJ.2017.Origin of the Lengshuigou porphyry-skarn Cu deposit in the Zha-Shan district,South Qinling,central China,and implications for differences between porphyry Cu and Mo deposits.Mineralium Deposita,52(4):621-639
Xu RH,Schrer U and Allègre CJ.1985.Magmatism and metamorphism in the Lhasa block(Tibet):A geochronological study.The Journal of Geology,93(1):41-57
Yang C,Tang JX,Wang YY,Yang HH,Wang Q,Sun XG,Feng J,Yin XB,Ding S,Fang X,Zhang Z and Li YB.2014.Fluid and geological characteristics researches of southern Tiegelong epithemal porphyry Cu-Au deposit in Tibet.Mineral Deposits,33(6):1287-1305(in Chinese with English abstract)
Yang JH,Wu FY,Wilde SA,Xie LW,Yang YH and Liu XM.2007.Tracing magma mixing in granite genesis:In situ U-Pb dating and Hf-isotope analysis of zircons.Contributions to Mineralogy and Petrology,153(2):177-190
Yin A and Harrison TM.2000.Geologic evolution of the HimalayanTibetan Orogen.Annual Review of Earth and Planetary Sciences,28:211-280
Zhang KJ,Xia BD and Liang XW.2002.Mesozoic-Paleogene sedimentary facies and paleogeography of Tibet,western China:Tectonic implications.Geological Journal,37(3):217-246
Zhang KJ.2004.Secular geochemical variations of the Lower Cretaceous siliciclastic rocks from central Tibet(China)indicate a tectonic transition from continental collision to back-arc rifting.Earth and Planetary Science Letters,229(1-2):73-89
Zhang KJ,Xia BD,Wang GM,Li YT and Ye HF.2004.Early Cretaceous stratigraphy,depositional environments,sandstone provenance,and tectonic setting of central Tibet,western China.Geological Society of America Bulletin,116(9-10):1202-1222
Zhang KJ,Zhang YX,Tang XC and Xia B.2012.Late Mesozoic tectonic evolution and growth of the Tibetan plateau prior to the Indo-Asian collision.Earth-Science Reviews,114(3-4):236-249
Zhao TP,Zhou MF,Zhao JH,Zhang KJ and Chen W.2008.Geochronology and geochemistry of the c.80Ma Rutog granitic pluton,northwestern Tibet:Implications for the tectonic evolution of the Lhasa Terrane.Geological Magazine,145(6):845-857
Zhu DC,Zhao ZD,Niu YL,Mo XX,Chung SL,Hou ZQ,Wang LQ and Wu FY.2011.The Lhasa Terrane:Record of a microcontinent and its histories of drift and growth.Earth and Planetary Science Letters,301(1-2):241-255
Zhu DC,Li SM,Cawood PA,Wang Q,Zhao ZD,Liu SA and Wang LQ.2016.Assembly of the Lhasa and Qiangtang terranes in central Tibet by divergent double subduction.Lithos,245:7-17
Zhu DC,Wang Q,Cawood PA,Zhao ZD and Mo XX.2017.Raising the Gangdese mountains in southern Tibet.Journal of Geophysical Research:Solid Earth,122(1):214-223
侯可军,李延河,田有荣.2009.LA-MC-ICP-MS锆石微区原位U-Pb定年技术.矿床地质,28(4):481-492
柳小明,高山,袁洪林,Hattendorf B,Gunther D,陈亮,胡圣红.2002.193nm LA-ICPMS对国际地质标准参考物质中42种主量和微量元素的分析.岩石学报,18(3):408-418
潘桂棠,朱弟成,王立全,廖忠礼,耿全如,江新胜.2004.班公湖-怒江缝合带作为冈瓦纳大陆北界的地质地球物理证据.地学前缘,11(4):371-382
宋鸿林,张长厚,王根厚.2013.构造地质学.北京:地质出版社
唐菊兴,宋扬,王勤,林彬,杨超,郭娜,方向,杨欢欢,王艺云,高轲,丁帅,张志,段吉琳,陈红旗,粟登逵,冯军,刘治博,韦少港,贺文,宋俊龙,李彦波,卫鲁杰.2016.西藏铁格隆南铜(金银)矿床地质特征及勘查模型---西藏首例千万吨级斑岩-浅成低温热液型矿床.地球学报,37(6):663-690
王成善,朱利东,刘志飞.2004.青藏高原北部盆地构造沉积演化与高原向北生长过程.地球科学进展,19(3):373-381
杨超,唐菊兴,王艺云,杨欢欢,王勤,孙兴国,冯军,印贤波,丁帅,方向,张志,李玉彬.2014.西藏铁格隆南浅成低温热液型-斑岩型Cu-Au矿床流体及地质特征研究.矿床地质,33(6):1287-1305