西藏南拉萨地块西部鸭洼地区侵入岩的锆石年代学和Hf同位素特征
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摘要
拉萨地块南缘发育了广泛的中、新生代岩浆作用,然而与中、东部地区相比,南拉萨地块西部地区的研究程度还相对偏低,尤其是缺乏中生代以前岩浆活动的发现和研究。本文对南拉萨地块西部鸭洼地区新发现的中、新生代侵入岩开展了详细的锆石U-Pb定年和Hf同位素研究,发现鸭洼地区发育了晚三叠世(210～208Ma)辉长岩和闪长玢岩、晚侏罗世(约155Ma)似斑状二长花岗岩和始新世(约50Ma)花岗斑岩。晚三叠世辉长岩和闪长玢岩具有相对亏损的锆石Hf同位素组成,ε_(Hf)(t)值分别是+1.9～+6.2和-3.0～+7.4。晚侏罗世似斑状二长花岗岩和始新世花岗斑岩则具有明显富集的锆石Hf同位素组成,其ε_(Hf)(t)值分别是-10.0～-5.2和-7.9～-2.7,对应的地壳模式年龄分别是1534～1836Ma和1297～1624Ma,分别反映了古元古代和中元古代古老陆壳物质为主的再循环作用。结合区域文献数据,鸭洼-打加错地区中生代以来由于新特提斯洋的俯冲而发生了明显的地壳增生作用,新生地壳的生长从中生代到新生代早期逐渐进行,并且具有从陆内向海沟逐渐增加的趋势。
The Lhasa terrane developed widespread magmatism along its southern margin in the Mesozoic to Cenozoic Period.However,relative small number of studies has conducted for the magmatic rocks from the west part of the southern Lhasa terrane,especially for the Mesozoic magmatic rocks.This contribution presented a study of zircon U-Pb age and Hf isotope for the newly found Mesozoic to Cenozoic intrusive rocks from the Yawa area in the west part of southern Lhasa terrane,and identified Late Triassic gabbro and dioritic porphyrites(210～208Ma),Late Jurassic porphyritic monzogranites(ca.155Ma)and Eocene granitic porphyry(ca.50Ma).The Late Triassic gabbro and dioritic porphyrite have highly radiogenic zircon Hf isotopic compositions withε_(Hf)(t)values of+1.9～+6.2 and-3.0～+7.4,respectively;while the Late Jurassic porphyritic monzogranite and the Eocene granitic porphyry show low initial zircon Hf isotope values ofε_(Hf)(t)varying in ranges of-10.0～-5.2 and-7.9～-2.7,respectively,and their corresponding crustal model ages,which can be divided into two groups of 1534～1836Ma and 1297～1624Ma,respectively,indicate the existence of the recycled Paleoproterozoic and Mesoproterozoic crustal materials,respectively.In combination with literature data,the Yawa-Dajiaco area underwent obvious crustal growth due to the subduction of Neo-Tethyan ocean.The generation of juvenile crust exhibit gradient trends of increase both from Mesozoic to Early Cenozoic and from inland to trench.
The Lhasa terrane developed widespread magmatism along its southern margin in the Mesozoic to Cenozoic Period.However,relative small number of studies has conducted for the magmatic rocks from the west part of the southern Lhasa terrane,especially for the Mesozoic magmatic rocks.This contribution presented a study of zircon U-Pb age and Hf isotope for the newly found Mesozoic to Cenozoic intrusive rocks from the Yawa area in the west part of southern Lhasa terrane,and identified Late Triassic gabbro and dioritic porphyrites(210～208Ma),Late Jurassic porphyritic monzogranites(ca.155Ma)and Eocene granitic porphyry(ca.50Ma).The Late Triassic gabbro and dioritic porphyrite have highly radiogenic zircon Hf isotopic compositions withε_(Hf)(t)values of+1.9～+6.2 and-3.0～+7.4,respectively;while the Late Jurassic porphyritic monzogranite and the Eocene granitic porphyry show low initial zircon Hf isotope values ofε_(Hf)(t)varying in ranges of-10.0～-5.2 and-7.9～-2.7,respectively,and their corresponding crustal model ages,which can be divided into two groups of 1534～1836Ma and 1297～1624Ma,respectively,indicate the existence of the recycled Paleoproterozoic and Mesoproterozoic crustal materials,respectively.In combination with literature data,the Yawa-Dajiaco area underwent obvious crustal growth due to the subduction of Neo-Tethyan ocean.The generation of juvenile crust exhibit gradient trends of increase both from Mesozoic to Early Cenozoic and from inland to trench.
引文
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Chu MF,Chung SL,Song B,Liu DY,O’Reilly SY,Pearson NJ,Ji JQand Wen DJ.2006.Zircon U-Pb and Hf isotope constraints on the Mesozoic tectonics and crustal evolution of southern Tibet.Geology,34(9):745-748
Chu MF,Chung SL,O’Reilly SY,Pearson NJ,Wu FY,Li XH,Liu DY,Ji JQ,Chu CH and Lee HY.2011.India’s hidden inputs to Tibetan orogeny revealed by Hf isotopes of Transhimalayan zircons and host rocks.Earth and Planetary Science Letters,307(3-4):479-486
Chung SL,Chu MF,Zhang YQ,Xie YW,Lo CH,Lee TY,Lan CY,Li XH,Zhang Q and Wang YZ.2005.Tibetan tectonic evolution inferred from spatial and temporal variations in post-collisional magmatism.Earth-Science Reviews,68(3-4):173-196
De Paolo DJ.1980.Sources of continental crust:Neodymium isotope evidence from the Sierra Nevada and Peninsular ranges.Science,209(4457):684-687
De Paolo DJ.1981.A neodymium and strontium isotopic study of the Mesozoic calc-alkaline granitic batholiths of the Sierra Nevada and Peninsular Ranges,California.Journal of Geophysical Research,86(B11):10470-10488
Dong X,Zhang ZM,Liu F,Wang W,Yu F and Shen K.2011.Zircon U-Pb geochronology of the Nyainqentanglha Group from the Lhasa terrane:New constraints on the Triassic orogeny of the South Tibet.Journal of Asian Earth Sciences,42(4):732-739
Dong X and Zhang ZM.2013.Genesis and tectonic significance of the Early Jurassic magmatic rocks from the southern Lhasa terrane.Acta Petrologica Sinica,29(6):1933-1948(in Chinese with English abstract)
Guo L,Zhang HF,Harris N,Pan FB and Xu WC.2011.Origin and evolution of multi-stage felsic melts in eastern Gangdese belt:Constraints from U-Pb zircon dating and Hf isotopic composition.Lithos,127(1-2):54-67
Hou ZQ,Duan LF,Lu YJ,Zheng YC,Zhu DC,Yang ZM,Yang ZS,Wang BD,Pei YR,Zhao ZD and Mc Cuaig TC.2015.Lithospheric architecture of the Lhasa terrane and its control on ore deposits in the Himalayan-Tibetan orogen.Economic Geology,110(6):1541-1575
Hu DG,Wu ZH,Jiang W,Shi YR,Ye PS and Liu QS.2005.SHRIMPzircon U-Pb age and Nd isotopic study on the Nyainqêntanglha Group in Tibet.Science in China(Series D),48(9):1377-1386
Ji WQ,Wu FY,Chung SL,Li JX and Liu CZ.2009.Zircon U-Pb geochronology and Hf isotopic constraints on petrogenesis of the Gangdese batholith,southern Tibet.Chemical Geology,262(3-4):229-245
Ji WQ,Wu FY,Liu CZ and Chung SL.2012a.Early Eocene crustal thickening in southern Tibet:New age and geochemical constraints from the Gangdese batholith.Journal of Asian Earth Sciences,53:82-95
Ji WQ,Wu FY,Chung SL and Liu CZ.2012b.Identification of Early Carboniferous granitoids from Southern Tibet and implications for terrane assembly related to the paleo-tethyan evolution.Journal of Geology,120(5):531-541
Jiang JS,Zheng YY,Gao SB,Zhang YC,Huang J,Liu J,Wu S,Xu Jand Huang LL.2018.The newly-discovered Late Cretaceous igneous rocks in the Nuocang district:Products of ancient crust melting trigged by Neo-Tethyan slab rollback in the western Gangdese.Lithos,308-309:294-315
Jiang ZQ,Wang Q,Wyman DA,Li ZX,Yang JH,Shi XB,Ma L,Tang GJ,Gou GN,Jia XH and Guo HF.2014.Transition from oceanic to continental lithosphere subduction in southern Tibet:Evidence from the Late Cretaceous-Early Oligocene(91~30Ma)intrusive rocks in the Chanang-Zedong area,southern Gangdese.Lithos,196-197:213-231
Lee HY,Chung SL,Lo CH,Ji JQ,Lee TY,Qian Q and Zhang Q.2009.Eocene Neotethyan slab breakoff in southern Tibet inferred from the Linzizong volcanic record.Tectonophysics,477(1-2):20-35
Li FQ,Liu W,Zhang SZ and Wang BD.2012.Chronology and geochemical characteristics of Yawa mafic complex in the Dajiacuo area,Southern Gangdese.Acta Geologica Sinica,86(10):1592-1603(in Chinese with English abstract)
Li XH,Li WX,Wang XC,Li QL,Liu Y and Tang GQ.2009.Role of mantle-derived magma in genesis of Early Yanshanian granites in the Nanling Range,south China:In situ zircon Hf-O isotopic constraints.Science in China(Series D),52(9):1262-1278
Liu J,Zheng YY,Gao SB,Jiang JS and Cao HW.2018.Zircon U-Pb dating,geochemistry,and Sr-Nd-Pb-Hf isotopes of the subvolcanic intrusion from Beina Pb-Zn-(Ag)deposit in the southern Lhasa terrane,Tibet:Implications for petrogenesis and mineralization.Geological Journal,doi:10.1002/gj.3284
Ludwig KR.2003.User’s Manual for Isoplot 3.00:A Geochronological Toolkit for Microsoft Excel.Berkeley Geochronology Center,Special Publication,4:1-71
Ma SW,Meng YK,Xu ZQ and Liu XJ.2017.The discovery of late Triassic mylonitic granite and geologic significance in the middle Gangdese batholiths,southern Tibet.Journal of Geodynamics,104:49-64
Ma XX,Meert JG,Xu ZQ and Yi ZY.2018.Late Triassic intra-oceanic arc system within Neotethys:Evidence from cumulate appinite in the Gangdese belt,southern Tibet.Lithosphere,10(4):545-565
Meng YK,Xu ZQ,Santosh M,Ma XX,Chen XJ,Guo GL and Liu F.2016.Late Triassic crustal growth in southern Tibet:Evidence from the Gangdese magmatic belt.Gondwana Research,37:449-464
Mo XX,Dong GC,Zhao ZD,Zhou S,Wang LL,Qiu RZ and Zhang FQ.2005.Spatial and temporal distribution and characteristics of granitoids in the Gangdese,Tibet and implication for crustal growth and evolution.Geological Journal of China Universities,11(3):281-290(in Chinese with English abstract)
Pan GT,Mo XX,Hou ZQ,Zhu DC,Wang LQ,Li GM,Zhao ZD,Geng QR and Liao ZL.2006.Spatial-temporal framework of the Gangdese Orogenic Belt and its evolution.Acta Petrologica Sinica,22(3):521-533(in Chinese with English abstract)
Peng JH,Zhao XL,He J,Huang SC and Gong C.2013.Discovery of indosinian magmatic rocks and its significance in western Gangdise,Tibet.Journal of East China Institute of Technology(Natural Science),36(Suppl.2):21-26(in Chinese with English abstract)
Song SW,Liu Z,Zhu DC,Wang Q,Zhang LX,Zhang LL and Zhao ZD.2014.Zircon U-Pb chronology and Hf isotope of the Late Triassic andesitic magmatism in Dajiacuo,Tibet.Acta Petrologica Sinica,30(10):3100-3112(in Chinese with English abstract)
Wang C,Ding L,Zhang LY,Kapp P,Pullen A and Yue YH.2016.Petrogenesis of Middle-Late Triassic volcanic rocks from the Gangdese belt,southern Lhasa terrane:Implications for early subduction of Neo-Tethyan oceanic lithosphere.Lithos,262:320-333
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