PDF(9643 KB)
柴北缘尖峰山含石榴石花岗闪长岩年代学、岩石地球化学及地质意义
张金明, 王秉璋, 付彦文, 田成秀
PDF(9643 KB)
PDF(9643 KB)
柴北缘尖峰山含石榴石花岗闪长岩年代学、岩石地球化学及地质意义
Chronology, Petrogeochemistry and Geological Significance of Garnet Bearing Granodiorite in Jianfengshan Area, Northern Qaidam Margin
柴北缘尖峰山地区含石榴石花岗闪长岩呈脉状分布在达肯大坂岩群中，岩石主要由石英（30%~35%）、斜长石（45%~50%）、钾长石（15%~20%）、黑云母（5%）及少量的白云母（<5%）和石榴石（<5%）组成.锆石U-Pb定年结果表明，含石榴石花岗闪长岩的形成时代为（441.1±1.4） Ma，属于早志留世.岩石具有高SiO2（66.27%~74.42%）、Na2O（3.47%~6.75%）、Al2O3（14.71%~20.43%），低MgO（0.07%~0.56%）、Mg#（19.8~43.6）含量和强过铝质（A/CNK介于0.99~1.34）特征，其U、K、Ba等元素相对富集，亏损Nb、Ta、Sr、P、Eu、Ti等元素.稀土元素配分曲线呈右倾型，显示弱的负Eu异常（δEu=0.31~0.81）.岩石具有较高的I Sr值（0.707 123~0.708 081）和负的ε Nd（t）值（-1.91~-2.37），双阶段模式年龄T DM2为1 660~1 756 Ma.经校正后的（206Pb/204Pb）i值为18.354 7~18.582 2，（207Pb/204Pb）i值为15.365 4~15.641 2，（208Pb/204Pb）i值为38.254 7~38.654 1.锆石Hf同位素ε Hf（t）比值为2.5~-9.1，对应的Hf同位素地壳模式年龄T DM2为1 263~2 012 Ma.岩石地球化学及同位素的研究表明，尖峰山含石榴石花岗闪长岩为S型花岗岩，形成于柴达木陆块与祁连陆块碰撞造山阶段，是早期俯冲的大陆和大洋地壳经历了超高压变质作用（榴辉岩相条件）的同时经历部分熔融流体上升导致陆壳发生部分熔融形成.
Garnet bearing granodiorite in the Jianfengshan area on the northern margin of Qaidam basin is vein distributed in Dakendaban rock group. The rocks are mainly composed of quartz (30%-35%), plagioclase (45%-50%), potassium feldspar (15%-20%), biotite (5%) and a small amount of muscovite (<5%),garnet (<5%).Zircon U-Pb dating shows that the formation age of garnet bearing granodiorite is (441.1 ± 1.4) Ma, belonging to Early Silurian.The rocks have high SiO2 (66.27%-74.42%), Na2O (3.47%-6.75%), Al2O3 (14.71%-20.43%), low MgO (0.07%-0.56%), Mg# (19.8-43.6) contents and strong peraluminite (A/CNK ranges from 0.99~1.34).The minerals are enriched in U, K, Ba and depleted in Nb, Ta, Sr, P, Eu, Ti and other elements. The REE distribution curves show a right-leaning pattern, showing a weak negative Eu anomaly (δEu= 0.31-0.81). The rocks have high I Sr values (0.707 123-0.708 081) and negative ε Nd(t) values (-1.91 to -2.37), and the two-stage model age T DM2 is 1 660-1 756 Ma. After correction, (206Pb/204Pb)i value is 18.354 7-18.582 2, (207Pb/204Pb)i value is 15.365 4-15.641 2, (208Pb/204Pb)i value is 38.254 7-38.654 1. Zircon Hf ε Hf(t) ratios range from 2.5 to -9.1, and the corresponding Hf isotopic crust model ages T DM2 range in 1 263-2 012 Ma. The study of rock geochemistry and isotopes shows that the garnet bearing granodiorite in the Jianfengshan is an S-type granite, which was formed in the collision orogenic stage between Qaidam block and Qilian block. It is the early subducted continental and oceanic crust that experienced ultra-high pressure metamorphism (eclogite facies conditions) and the rise of partially molten fluid, resulting in the partial melting of the continental crust.
柴北缘 / 尖峰山 / 含石榴石花岗闪长岩 / 锆石U-Pb年龄 / Sr-Nd-Pb-Hf同位素 / 矿床学 / 岩石学.
northern margin of Qaidam / Jianfengshan area / garnet bearing granodiorite / zircon U-Pb age / Sr-Pb-Hf isotope / ore deposit geology / petrology
P581
|
Abbott，R.N.，1981.The Role of Manganese in the Paragenesis of Magmatic Garnet:An Example from the Old Woman-Piute Range，California:A Discussion.The Journal of Geology，89(6):767-769.
|
|
Altherr,R.,Holl,A.,Hegner,E.,et al.,2000.High-Potassium,Calc-Alkaline I-Type Plutonism in the European Variscides:Northern Vosges (France) and Northern Schwarzwald (Germany).Lithos,50(1-3):51-73.https://doi.org/10.1016/s0024-4937(99)00052-3
|
|
Allan,B.,Clarke,D.B.,1981.Occurrence and Origin of Garnets in the South Mountain Batholith,Nova Scotia.Canadian Mineralogist,19:19-24.
|
|
Barbarin,B.,1990.Granitoids:Main Petrogenetic Classifications in Relation to Origin and Tectonic Setting.Geological Journal,25(3-4):227-238.https://doi.org/10.1002/gj.3350250306
|
|
Barth,M.G.,McDonough,W.F.,Rudnick,R.L.,2000.Tracking the Budget of Nb and Ta in the Continental Crust.Chemical Geology,165(3-4):197-213.https://doi.org/10.1016/s0009-2541(99)00173-4
|
|
Batchelor,R.A.,Bowden,P.,1985.Petrogenetic Interpretation of Granitoid Rock Series Using Multicationic Parameters.Chemical Geology,48(1-4):43-55.https://doi.org/10.1016/0009-2541(85)90034-8
|
|
Belousova,E.A.,Griffin,W.L.,O’Reilly,S.Y.,2006.Zircon Crystal Morphology,Trace Element Signatures and Hf Isotope Composition as a Tool for Petrogenetic Modelling:Examples from Eastern Australian Granitoids.Journal of Petrology,47(2):329-353.https://doi.org/10.1093/petrology/egi077
|
|
Brown,D.,Ryan,P.D.,Afonso,J.C.,et al.,2011.Arc-Continent Collision:The Making of an Orogen.Frontiers in Earth Sciences.Springer,Berlin, Heidelberg,477-493.https://doi.org/10.1007/978-3-540-88558-0_17
|
|
Cai,P.J.,Xu,R.K.,Zheng,Y.Y.,et al.,2018.From Oceanic Subduction to Continental Collision in North Qaidam:Evidence from Kaipinggou Orogenic M-Type Peridotite.Earth Science,43(8):2875-2892 (in Chinese with English abstract).
|
|
Chappell,B.W.,1999.Aluminium Saturation in I- and S-Type Granites and the Characterization of Fractionated Haplogranites.Lithos,46(3):535-551.https://doi.org/10.1016/s0024-4937(98)00086-3
|
|
Chen,N.S.,Gong,S.L.,Sun,M.,et al.,2009.Precambrian Evolution of the Quanji Block,Northeastern Margin of Tibet:Insights from Zircon U-Pb and Lu-Hf Isotope Compositions.Journal of Asian Earth Sciences,35(3-4):367-376.https://doi.org/10.1016/j.jseaes.2008.10.004
|
|
Green,T.H.,1995.Significance of Nb/Ta as an Indicator of Geochemical Processes in the Crust-Mantle System.Chemical Geology,120(3-4):347-359.https://doi.org/10.1016/0009-2541(94)00145-x
|
|
Hu,Z.C.,Liu,Y.S.,Gao,S.,et al.,2012.Improved In Situ Hf Isotope Ratio Analysis of Zircon Using Newly Designed X Skimmer Cone and Jet Sample Cone in Combination with the Addition of Nitrogen by Laser Ablation Multiple Collector ICP-MS.Journal of Analytical Atomic Spectrometry,27(9):1391.https://doi.org/10.1039/c2ja30078h
|
|
Irber,W.,1999.The Lanthanide Tetrad Effect and Its Correlation with K/Rb,Eu/Eu,Sr/Eu,Y/Ho,and Zr/Hf of Evolving Peraluminous Granite Suites.Geochimica et Cosmochimica Acta,63(3-4):489-508.https://doi.org/10.1016/s0016-7037(99)00027-7
|
|
Liu,Y.S.,Zong,K.Q.,Kelemen,P.B.,et al.,2008.Geochemistry and Magmatic History of Eclogites and Ultramafic Rocks from the Chinese Continental Scientific Drill Hole:Subduction and Ultrahigh-Pressure Metamorphism of Lower Crustal Cumulates.Chemical Geology,247(1-2):133-153.https://doi.org/10.1016/j.chemgeo.2007.10.016
|
|
Lu,S.N.,Chen,Z.H.,Li,H.K.,et al.,2004.Late Mesoproterozoic-Early Neoproterozoic Evolution of the Qinling Orogen.Geological Bulletin of China,23(2):107-112 (in Chinese with English abstract).
|
|
Lu，S.N.，Yu，H.F.，Zhao，F.Q.，2002.Preliminary Study on Precambrian Geology in the Northern Qinghai-Tibet Plateau.Geological Publishing House，Beijing(in Chinese).
|
|
Ma,Q.,Zheng,J.P.,Griffin,W.L.,et al.,2012.Triassic “Adakitic” Rocks in an Extensional Setting (North China):Melts from the Cratonic Lower Crust.Lithos,149:159-173.https://doi.org/10.1016/j.lithos.2012.04.017
|
|
Maniar,P.D.,Piccoli,P.M.,1989.Tectonic Discrimination of Granitoids.Geological Society of America Bulletin,101(5):635-643.https://doi.org/10.1130/0016-7606(1989)1010635:tdog>2.3.co;2
|
|
Meng,F.C.,Zhang,J.X.,2008.Contemporaneous of Early Palaeozoic Granite and High Temperature Metamorphism,North Qaidam Mountains,Western China.Acta Petrologica Sinica,24(7):1585-1594 (in Chinese with English abstract)
|
|
Mo,X.X.,2020.Growth and Evolution of Crust of Tibetan Plateau from Perspective of Magmatic Rocks.Earth Science,45(7):2245-2257 (in Chinese with English abstract).
|
|
Middlemost,E.A.K.,1994.Naming Materials in the Magma/Igneous Rock System.Earth-Science Reviews,37(3-4):215-224.https://doi.org/10.1016/0012-8252(94)90029-9
|
|
Pan,G.T.,Xiao,Q.H.,Lu,S.N.,et al.,2009.Subdivision of Tectonic Units in China.Geology in China,36(1):1-28 (in Chinese with English abstract).
|
|
Pearce,J.A.,Lippard,S.J.,Roberts,S.,1984.Characteristics and Tectonic Significance of Supra-Subduction Zone Ophiolites.Geological Society,London,Special Publications,16(1):77-94.https://doi.org/10.1144/gsl.sp.1984.016.01.06
|
|
Ren,Y.F.,Chen,D.L.,Gong,X.K.,et al.,2019.Discovery and P-T-t Paths of Lawsonite Pseudomorph-Bearing Eclogites in the Yuka Terrane,North Qaidam Ultrahigh Pressure Metamorphic Belt and Exploration on Key Factors Controlling Lawsonite Formation.Earth Science,44(12):4009-4016 (in Chinese with English abstract).
|
|
Rickwood,P.C.,1989.Boundary Lines within Petrologic Diagrams Which Use Oxides of Major and Minor Elements.Lithos,22(4):247-263.https://doi.org/10.1016/0024-4937(89)90028-5
|
|
Song,S.G.,Niu,Y.L.,Su,L.,et al.,2014.Adakitic (Tonalitic-Trondhjemitic) Magmas Resulting from Eclogite Decompression and Dehydration Melting during Exhumation in Response to Continental Collision.Geochimica et Cosmochimica Acta,130:42-62.https://doi.org/10.1016/j.gca.2014.01.008
|
|
Song,S.G.,Niu,Y.L.,Zhang,L.F.,et al.,2009.Time Constraints on Orogenesis from Oceanic Subduction to Continental Subduction,Collision,and Exhumation:An Example from North Qilian and North Qaidam HP-UHP Belts.Acta Petrologica Sinica,25(9):2067-2077 (in Chinese with English abstract).
|
|
Song，S.G.，Wang，M.J.，Wang，C.,et al.，2015.Magmatism during Continental Collision,Subduction,Exhumation and Mountain Collapse in Collisional Orogenic Belts and Continental Net Growth:A Perspective.Science in China (Series D),45(7):916-940 (in Chinese).
|
|
Song,S.G.,Zhang,L.F.,Niu,Y.L.,et al.,2007.Two Types of Peridotite in Continental Orogenic Belts：A Case Study from the North Qaidam UHP Metamorphic Belt.Earth Science Frontiers,14(2):129-138 (in Chinese with English abstract).
|
|
Sun,S.S.,McDonough,W.F.,1989.Chemical and Isotopic Systematics of Oceanic Basalts:Implications for Mantle Composition and Processes.Geological Society,London,Special Publications,42(1):313-345.https://doi.org/10.1144/gsl.sp.1989.042.01.19
|
|
Sylvester,P.J.,1998.Post-Collisional Strongly Peraluminous Granites.Lithos,45(1-4):29-44.https://doi.org/10.1016/s0024-4937(98)00024-3
|
|
Villaros,A.,Stevens,G.,Moyen,J.F.,et al.,2009.The Trace Element Compositions of S-Type Granites:Evidence for Disequilibrium Melting and Accessory Phase Entrainment in the Source.Contributions to Mineralogy and Petrology,158(4):543-561.https://doi.org/10.1007/s00410-009-0396-3
|
|
Wang,H.Q.,Shao,T.Q.,Tang,H.H.,et al.,2016.Metamorphic Rock Deformation Characteristics,Geochemical Characteristics and Geological Significance of the Dakendaba Group in Buhete Mountain on the Northern Margin of Qaidam Mountain.Geological Bulletin of China,35(9):1488-1496 (in Chinese with English abstract).
|
|
Wu,C.L.,Gao,Y.H.,Li,Z.L.,et al.,2014.Zircon SHRIMP U-Pb Dating of Granites from Dulan and the Chronological Framework of the North Qaidam UHP Belt,NW China.Science China:Earth Sciences，44(10):2142-2159 (in Chinese).
|
|
Wu,C.L.,Gao,Y.H.,Wu,S.P.,et al.,2007.Zircon SHRIMP U-Pb Dating of Granites from the Da Qaidam Area in the North Margin of Qaidam Basin,NW China.Acta Petrologica Sinica,23(8):1861-1875 (in Chinese with English abstract).
|
|
Wu,C.L.,Gao,Y.H.,Wu,S.P.,et al.,2008.Zircon SHRIMP U-Pb Dating of Granites in the Western Part of Northern Qaidam Basin and Its Petrogeochemical Characteristics.Science in China (Series D),38(8):930-949 (in Chinese).
|
|
Wu，C.L.，Yang，J.S.，Li，H.B.，et al.，2001.Zircon SHRIMP Ages of Mountain Qaidam.Chinese Science Bulletin， 46 (20):1743-1746 (in Chinese).
|
|
Wu,F.Y.,Li,X.H.,Zheng,Y.F.,et al.,2007.Lu-Hf Isotopic Systematics and Their Applications in Petrology.Acta Petrologica Sinica,23(2):185-220 (in Chinese with English abstract).
|
|
Wu,F.Y.,Yang,Y.H.,Xie,L.W.,et al.,2006.Hf Isotopic Compositions of the Standard Zircons and Baddeleyites Used in U-Pb Geochronology.Chemical Geology,234(1-2):105-126.https://doi.org/10.1016/j.chemgeo.2006.05.003
|
|
Xu,Z.Q.,Li,H.B.,Yang,J.S.,2006.An Orogenic Plateau:The Orogenic Collage and Orogenic Types of the Qinghai-Tibet Plateau.Earth Science Frontiers,13(4):1-17 (in Chinese with English abstract).
|
|
Yan,G.Q.,Wang,X.X.,Huang,Y.,et al.,2020.Constraint of Pb Isotope on Ore-Forming Source Origin of Nuri Polymetallic Deposit,Tibet.Earth Science,45(1):31-42 (in Chinese with English abstract).
|
|
Yu,S.Y.,Zhang,J.X.,Li,H.K.,et al.,2013.Geochemistry,Zircon U-Pb Geochronology and Lu-Hf Isotopic Composition of Eclogites and Their Host Gneisses in the Dulan Area,North Qaidam UHP Terrane:New Evidence for Deep Continental Subduction.Gondwana Research,23(3):901-919.https://doi.org/10.1016/j.gr.2012.07.018
|
|
Zartman,R.E.,Haines,S.M.,1988.The Plumbotectonic Model for Pb Isotopic Systematics among Major Terrestrial Reservoirs:A Case for Bi-Directional Transport.Geochimica et Cosmochimica Acta,52(6):1327-1339.https://doi.org/10.1016/0016-7037(88)90204-9
|
|
Zha,X.F.,Gu,P.Y.,Dong,Z.C.,et al.,2016.Geological Record of Tectono-Thermal Event at Early Paleozoic and Its Tectonic Setting in West Segment of the North Qaidam.Earth Science,41(4):586-604(in Chincsc with English abstract).
|
|
Zhang,G.B.,Zhang,L.F.,Song,S.G.,2012.An Overview of the Tectonic Evolution of North Qaidam UHPM Belt:From Oceanic Subduction to Continental Collision.Geological Journal of China Universities,18(1):28-40 (in Chinese with English abstract).
|
|
Zhang,J.X.,Yang,J.S.,Mattinson,C.G.,et al.,2005.Two Contrasting Eclogite Cooling Histories,North Qaidam HP/UHP Terrane,Western China:Petrological and Isotopic Constraints.Lithos,84(1-2):51-76.https://doi.org/10.1016/j.lithos.2005.02.002
|
|
Zhao,Z.X.,Wei,J.H.,Fu,L.B.,et al.,2017.The Early Paleozoic Xitieshan Syn-Collisional Granite in the North Qaidam Ultrahigh-Pressure Metamorphic Belt,NW China:Petrogenesis and Implications for Continental Crust Growth.Lithos,278:140-152.https://doi.org/10.1016/j.lithos.2017.01.019
|
|
Zhou,B.,Zheng,Y.Y.,Xu,R.K.,et al.,2013.LA-ICP-MS Zircon U-Pb Dating and Hf Isotope Geochemical Characteristics of Qaidamshan Intrusive Body.Geological Bulletin of China,32(7):1027-1034 (in Chinese with English abstract).
|
|
Zhu,X.H.,Chen,D.L.,Liu,L.,et al.,2014.Geochronology,Geochemistry and Significance of the Early Paleozoic Back-Arc Type Ophiolite in Lüliangshan Area,North Qaidam.Acta Petrologica Sinica,30(3):822-834 (in Chinese with English abstract).
|
|
Zindler,A.,Hart,S.,1986.Chemical Geodynamics.Annual Review of Earth and Planetary Sciences,14:493-571.https://doi.org/10.1146/annurev.earth.14.1.493
|
/
| 〈 |
|
〉 |
AI Summary
