Cogenetic Dykes the Key to Identifying Diverse Magma Batches in the Assembly of Granitic Plutons

This study demonstrates that dykes that are coeval and cogenetic with plutons can provide an important tool for recognizing discrete batches of magma with similar overall chemical compositions and physical attributes, but different isotopic characteristics, and which contributed to pluton formation. The Qianlishan granitic pluton, located in the Qin–Hang fault zone separating the Yangtze block from the Cathaysia block in South China, was emplaced at 155–152 Ma in the Late Jurassic. It consists of a central zone of strongly differentiated zinnwaldite-bearing equigranular granite surrounded by a less differentiated porphyritic granite. The pluton is spatially associated with an extensive granitic dyke swarm dated here at 153–152 Ma, demonstrating a coeval relationship. Amongst the dykes, two discrete end-member sources can be identified from the bimodal nature of their zircon hafnium and oxygen systematics, with one group showing a range in εHf(t) of -11·9 to -8·0 and in δ18O of 9·0–10·4‰, whereas in the other group the ranges are from -7·3 to -4·1 and 8·4–9·4‰, respectively. This contrasts with the two phases of the Qianlishan pluton, which record wide ranges in εHf(t) of -11·1 to -5·1 and in δ18O of 8·3–10.4‰, but without bimodality. Hence, the overlapping Hf–O isotopic profiling shows the dykes and pluton to be cogenetic. Small-volume magma batches, with their rapid transport through the crust and quick cooling, are all typical features of dyke generation, thus preserving the original heterogeneous Hf–O isotopic signatures that are characteristic of two distinct crustal sources. However, although the pluton was formed from similar sources to the dykes, the bimodal source identity was lost during its assembly through mixing of the magma batches. These findings also provide a potential explanation for the wide range of zircon hafnium isotopic systematics typical of granitic plutons, as shown by sampling at all scales.

[1]  A. Glazner,et al.  Aplite diking and infiltration: a differentiation mechanism restricted to plutonic rocks , 2020, Contributions to Mineralogy and Petrology.

[2]  J. Woodhead,et al.  Petrogenesis of granitoids from the Lachlan Fold Belt, southeastern Australia: The role of disequilibrium melting , 2020 .

[3]  J. Zeng,et al.  Hafnium isotopic disequilibrium during sediment melting and assimilations , 2020, Geochemical Perspectives Letters.

[4]  J. Vervoort,et al.  Generation of I-type granitic rocks by melting of heterogeneous lower crust , 2018, Geology.

[5]  A. Glazner,et al.  Dike intrusion and deformation during growth of the Half Dome pluton, Yosemite National Park, California , 2018 .

[6]  Yong‐Fei Zheng,et al.  Mixing of Felsic Magmas in Granite Petrogenesis: Geochemical Records of Zircon and Garnet in Peraluminous Granitoids From South China , 2018 .

[7]  S. Goldstein,et al.  Do Hf isotopes in magmatic zircons represent those of their host rocks , 2018 .

[8]  J. Woodhead,et al.  Modelling Isotopic Responses to Disequilibrium Melting in Granitic Systems , 2018 .

[9]  M. Lespinasse,et al.  The ore-forming magmatic-hydrothermal system of the Piaotang W-Sn deposit (Jiangxi, China) as seen from Li-mica geochemistry , 2018 .

[10]  A. Berry,et al.  Formation of Hadean granites by melting of igneous crust , 2017 .

[11]  K. Cooper.  What Does a Magma Reservoir Look Like? The “Crystal's-Eye” View , 2017 .

[12]  Lianghui Guo,et al.  Potential-field evidence for the tectonic boundaries of the central and western Jiangnan belt in South China , 2017 .

[13]  A. Kisters,et al.  Episodic granite accumulation and extraction from the mid‐crust , 2016 .

[14]  B. Charlier,et al.  The Life and Times of Silicic Volcanic Systems , 2016 .

[15]  D. McInerney,et al.  Strengths and limitations of zircon Lu-Hf and O isotopes in modelling crustal growth , 2016 .

[16]  R. Tartèse,et al.  Nb-Ta fractionation in peraluminous granites: A marker of the magmatic-hydrothermal transition , 2016 .

[17]  S. Bhattacharya,et al.  A Short Review on Lu-Hf Isotope System in Zircon: Implications for Crustal Evolution , 2015 .

[18]  Cin-Ty A. Lee,et al.  High silica granites: Terminal porosity and crystal settling in shallow magma chambers , 2015 .

[19]  Rucheng Wang,et al.  Geochronological and geochemical constraints on the petrogenesis and geodynamic setting of the Qianlishan granitic pluton, Southeast China , 2015, Mineralogy and Petrology.

[20]  B. Scaillet,et al.  On the conditions of magma mixing and its bearing on andesite production in the crust , 2014, Nature Communications.

[21]  Zhiqiang Wang,et al.  Origin of the fluorine-rich highly differentiated granites from the Qianlishan composite plutons (South China) and implications for polymetallic mineralization , 2014 .

[22]  F. Gutiérrez,et al.  Identifying the crystal graveyards remaining after large silicic eruptions , 2014 .

[23]  G. Stevens,et al.  Extreme mineral-scale Sr isotope heterogeneity in granites by disequilibrium melting of the crust , 2014 .

[24]  Cin-Ty A. Lee,et al.  Mafic–felsic magma mixing limited by reactive processes: A case study of biotite-rich rinds on mafic enclaves , 2014 .

[25]  R. Dall’Agnol,et al.  Chemical characteristics of zircon from A-type granites and comparison to zircon of S-type granites , 2014 .

[26]  Tao Yang,et al.  Hafnium isotopic heterogeneity in zircons from granitic rocks: Geochemical evaluation and modeling of "zircon effect" in crustal anatexis , 2014 .

[27]  J. Charvet,et al.  Early Paleozoic depositional environment and intraplate tectono-magmatism in the Cathaysia Block (South China): Evidence from stratigraphic, structural, geochemical and geochronological investigations , 2014, American Journal of Science.

[28]  K. Ali,et al.  Zircon trace element geochemical constraints on the evolution of the Ediacaran (600–614 Ma) post-collisional Dokhan Volcanics and Younger Granites of SE Sinai, NE Arabian–Nubian Shield , 2013 .

[29]  Yue-heng Yang,et al.  Qinghu zircon: A working reference for microbeam analysis of U-Pb age and Hf and O isotopes , 2013 .

[30]  M. Whitehouse,et al.  Heterogeneous Zircon Cargo in Voluminous Late Paleozoic Rhyolites: Hf, O Isotope and Zr/Hf Records of Plutonic to Volcanic Magma Evolution , 2013 .

[31]  T. Sun,et al.  Magmatic evolution and crustal recycling for Neoproterozoic strongly peraluminous granitoids from southern China: Hf and O isotopes in zircon , 2013 .

[32]  I. Buick,et al.  Isotopic variations in S-type granites: an inheritance from a heterogeneous source? , 2012, Contributions to Mineralogy and Petrology.

[33]  T. Sun,et al.  Trace elements, U–Pb ages and Hf isotopes of zircons from Mesozoic granites in the western Nanling Range, South China: Implications for petrogenesis and W–Sn mineralization , 2011 .

[34]  D. Günther,et al.  Determination of Reference Values for NIST SRM 610–617 Glasses Following ISO Guidelines , 2011 .

[35]  N. Pearson,et al.  The New England Batholith of eastern Australia: Evidence of silicic magma mixing from zircon 176Hf/177Hf ratios , 2011 .

[36]  Thomas Monecke,et al.  Unusual rare earth element fractionation in a tin-bearing magmatic-hydrothermal system , 2011 .

[37]  D. Furbish,et al.  Growth of plutons by incremental emplacement of sheets in crystal-rich host: Evidence from Miocene intrusions of the Colorado River region, Nevada, USA , 2011 .

[38]  C. Annen.  Implications of incremental emplacement of magma bodies for magma differentiation, thermal aureole dimensions and plutonism-volcanism relationships , 2011 .

[39]  O. Bachmann,et al.  Trace element indicators of crystal accumulation in silicic igneous rocks , 2010 .

[40]  M. Gillespie,et al.  Do S-type granites commonly sample infracrustal sources? New results from an integrated O, U–Pb and Hf isotope study of zircon , 2010 .

[41]  Xian‐Hua Li,et al.  Precise U–Pb and Pb–Pb dating of Phanerozoic baddeleyite by SIMS with oxygen flooding technique , 2010 .

[42]  Yue-heng Yang,et al.  Penglai Zircon Megacrysts: A Potential New Working Reference Material for Microbeam Determination of Hf–O Isotopes and U–Pb Age , 2010 .

[43]  J. Hellstrom,et al.  Improved laser ablation U‐Pb zircon geochronology through robust downhole fractionation correction , 2010 .

[44]  C. M. Gray,et al.  Isotopic evidence for rapid continental growth in an extensional accretionary orogen: The Tasmanides, eastern Australia , 2009 .

[45]  Xian‐Hua Li,et al.  Precise determination of Phanerozoic zircon Pb/Pb age by multicollector SIMS without external standardization , 2009 .

[46]  J. Žák,et al.  The Mammoth Peak sheeted complex, Tuolumne batholith, Sierra Nevada, California: a record of initial growth or late thermal contraction in a magma chamber? , 2009 .

[47]  K. Zhao,et al.  Middle to late Jurassic felsic and mafic magmatism in southern Hunan province, southeast China: Implications for a continental arc to rifting , 2009 .

[48]  R. Flood,et al.  Zircon Hf Isotopic Evidence for Mixing of Crustal and Silicic Mantle-derived Magmas in a Zoned Granite Pluton, Eastern Australia , 2009 .

[49]  B. Frost,et al.  A Geochemical Classification for Feldspathic Igneous Rocks , 2008 .

[50]  L. Baumgartner,et al.  Incremental growth of the Patagonian Torres del Paine laccolith over 90 k.y , 2008 .

[51]  M. Whitehouse,et al.  Plesovice zircon : A new natural reference material for U-Pb and Hf isotopic microanalysis , 2008 .

[52]  T. Menand.  The mechanics and dynamics of sills in layered elastic rocks and their implications for the growth of laccoliths and other igneous complexes , 2008 .

[53]  E. Watson,et al.  Temperature spectra of zircon crystallization in plutonic rocks , 2007 .

[54]  C. M. Gray,et al.  Magmatic and Crustal Differentiation History of Granitic Rocks from Hf-O Isotopes in Zircon , 2007, Science.

[55]  Xian‐Hua Li,et al.  Formation of the 1300-km-wide intracontinental orogen and postorogenic magmatic province in Mesozoic South China: A flat-slab subduction model , 2007 .

[56]  Yue-heng Yang,et al.  Tracing magma mixing in granite genesis: in situ U–Pb dating and Hf-isotope analysis of zircons , 2006 .

[57]  K. Zhao,et al.  Petrogenesis of Late Jurassic Qianlishan granites and mafic dykes, Southeast China: implications for a back-arc extension setting , 2006, Geological Magazine.

[58]  W. Griffin,et al.  Zircon Crystal Morphology, Trace Element Signatures and Hf Isotope Composition as a Tool for Petrogenetic Modelling: Examples From Eastern Australian Granitoids , 2006 .

[59]  R. Sparks,et al.  Thermal Constraints on the Emplacement Rate of a Large Intrusive Complex: The Manaslu Leucogranite, Nepal Himalaya , 2006 .

[60]  Yong‐Fei Zheng,et al.  Metamorphic effect on zircon Lu-Hf and U-Pb isotope systems in ultrahigh-pressure eclogite-facies metagranite and metabasite [rapid communication] , 2005 .

[61]  M. Basei,et al.  4.4 billion years of crustal maturation: oxygen isotope ratios of magmatic zircon , 2005 .

[62]  M. Whitehouse,et al.  Hf isotopes in zircon reveal contrasting sources and crystallization histories for alkaline to peralkaline granites of Temora, southeastern Australia , 2005 .

[63]  J. Woodhead,et al.  A Preliminary Appraisal of Seven Natural Zircon Reference Materials for In Situ Hf Isotope Determination , 2005 .

[64]  A. Glazner,et al.  Rethinking the emplacement and evolution of zoned plutons: Geochronologic evidence for incremental assembly of the Tuolumne Intrusive Suite, California , 2004 .

[65]  A. Glazner,et al.  Are plutons assembled over millions of years by amalgamation from small magma chambers , 2004 .

[66]  N. Petford.  Rheology of granitic magmas during ascent and emplacement , 2003 .

[67]  Huaqi Li,et al.  Mineralization and Fluid Inclusion Study of the Shizhuyuan W-Sn-Bi-Mo-F Skarn Deposit, Hunan Province, China , 2003 .

[68]  J. Valley,et al.  Slow oxygen diffusion rates in igneous zircons from metamorphic rocks , 2003 .

[69]  J. Valley.  Oxygen Isotopes in Zircon , 2003 .

[70]  K. Ludwig.  User's Manual for Isoplot 3.00 - A Geochronological Toolkit for Microsoft Excel , 2003 .

[71]  Wang Yixian,et al.  Controls on the REE tetrad effect in granites : Evidence from the Qianlishan and Baerzhe Granites, China , 2002 .

[72]  H. Keppler,et al.  Melt composition control of Zr/Hf fractionation in magmatic processes , 2002 .

[73]  S. Wilde,et al.  A-type granites in northeastern China: age and geochemical constraints on their petrogenesis , 2002 .

[74]  S. Wilde,et al.  A cool early Earth , 2002 .

[75]  W. Griffin,et al.  Zircon chemistry and magma mixing, SE China: In-situ analysis of Hf isotopes, Tonglu and Pingtan igneous complexes , 2002 .

[76]  Yixian Wang,et al.  Highly evolved juvenile granites with tetrad REE patterns: the Woduhe and Baerzhe granites from the Great Xing'an Mountains in NE China , 2001 .

[77]  Calvin G. Barnes,et al.  A Geochemical Classification for Granitic Rocks , 2001 .

[78]  R. Miller,et al.  Construction of mid-crustal sheeted plutons: Examples from the North Cascades, Washington , 2001 .

[79]  Z. Bao,et al.  Crust-mantle interaction and its contribution to the Shizhuyuan superlarge tungsten polymetallic mineralization , 2001 .

[80]  A. Cruden,et al.  Granite magma formation, transport and emplacement in the Earth's crust , 2000, Nature.

[81]  N. Petford,et al.  Granites are not diapiric! , 2000 .

[82]  J. Dostal,et al.  Contrasting behaviour of Nb/Ta and Zr/Hf ratios in a peraluminous granitic pluton (Nova Scotia, Canada) , 2000 .

[83]  R. Miller,et al.  In defense of magmatic diapirs , 1999 .

[84]  W. Irber.  Quantification of the lanthanide tetrad effect and its correlation with K/Rb, Eu/Eu*, Sr/Eu, Y/Ho, and Zr/Hf of evolving peraluminous granite suites , 1999 .

[85]  Xilin Xie,et al.  Isotope Geochemistry of Granitoids in South China and Their Metallogeny , 1998 .

[86]  B. Jahn,et al.  Crustal evolution of southeastern China: Nd and Sr isotopic evidence , 1998 .

[87]  D. Cherniak,et al.  OXYGEN DIFFUSION IN ZIRCON , 1997 .

[88]  N. Petford,et al.  Are granitic intrusions scale invariant? , 1997, Journal of the Geological Society.

[89]  J. Bouchez,et al.  Granite Pluton Geometry and Emplacement Mode Inferred from Combined Fabric and Gravity Data , 1997 .

[90]  O. T. Tobisch,et al.  Assembly of a dike-fed magma chamber: The Jackass Lakes pluton, central Sierra Nevada, California , 1996 .

[91]  Xixi Zhao,et al.  Isotopic and paleomagnetic constraints on the Mesozoic tectonic evolution of south China , 1996 .

[92]  M. Bau.  Controls on the fractionation of isovalent trace elements in magmatic and aqueous systems: evidence from Y/Ho, Zr/Hf, and lanthanide tetrad effect , 1996 .

[93]  W. Collins.  Lachlan Fold Belt granitoids: products of three-component mixing , 1996, Earth and Environmental Science Transactions of the Royal Society of Edinburgh.

[94]  N. Petford.  Dykes or diapirs? , 1996, Earth and Environmental Science Transactions of the Royal Society of Edinburgh.

[95]  Mao Jingwen,et al.  Evolution of the Qianlishan Granite Stock and its Relation to the Shizhuyuan Polymetallic Tungsten Deposit , 1995 .

[96]  R. C. Kerr,et al.  The ascent of felsic magmas in dykes , 1994 .

[97]  R. C. Kerr,et al.  Dike transport of granitoid magmas , 1993 .

[98]  J. Clemens,et al.  Granitic magma transport by fracture propagation , 1992 .

[99]  I. Moreno-Ventas,et al.  H-type (hybrid) granitoids: a proposed revision of the granite-type classification and nomenclature , 1991 .

[100]  J. Vigneresse.  Use and misuse of geophysical data to determine the shape at depth of granitic intrusions , 1990 .

[101]  P. Piccoli,et al.  Tectonic discrimination of granitoids , 1989 .

[102]  Yang Shufen,et al.  The pre-Devonian tectonic patterns and evolution of South China , 1989 .

[103]  R. Sparks,et al.  Thermal and mechanical constraints on mixing between mafic and silicic magmas , 1986 .

[104]  J. Reid,et al.  Magma mixing in granitic rocks of the central Sierra Nevada , 1983 .

[105]  T. M. Harrison,et al.  Zircon saturation revisited: temperature and composition effects in a variety of crustal magma types , 1983 .

[106]  B. Chappell,et al.  Granitoid types and their distribution in the Lachlan Fold Belt, southeastern Australia , 1983 .

[107]  A. Streckeisen,et al.  Classification and nomenclature of volcanic rocks, lamprophyres, carbonatites, and melilitic rocks: Recommendations and suggestions of the IUGS Subcommission on the Systematics of Igneous Rocks , 1979 .

[108]  J. Weertman,et al.  Fluid flow through a large vertical crack in the Earth's crust , 1976 .

[109]  J. Kramers,et al.  Approximation of terrestrial lead isotope evolution by a two-stage model , 1975 .

[110]  B. Chappell,et al.  Two contrasting granite types , 1974 .

[111]  A. Buddington.  Granite Emplacement with Special Reference to North America , 1959 .