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Early J_2 basalts in sE China:Incipience of large-scale late Mesozoic magmatism

science China earth sciences 2006年第8期49卷 796-815页

作者： XIE Xin1, XU Xisheng1, ZOU Haibo2, JIAnG shaoyong1, ZHAnG Ming3.& QIU Jiansheng1 1. state key Laboratory of Mineral Deposit Research, department of {3. sciences, nanjing university, nanjing 210093. China 2. department of {3. and space sciences, university of California at Los Angeles, Los Angeles, CA90095-1567, UsA. 3. gemoc arc national key centre, department of earth and planetary sciences, macquarie university,{13., n.s.w. 2109, australia state key Laboratory of Mineral Deposit Research Department of Earth Sciences Nanjing University Nanjing China department of earth and space sciences University of California at Los Angeles Los Angeles USA gemoc arc national {3. centre Department of Earth and Planetary Sciences Macquarie University Sydney Australia

Magmatism in sE China was dormant during 204―180 Ma, but was reactivated in 180― 170 Ma (early J2), and then became more and more intensive towards the end of early Cretaceous. The small-scale early J2 magmatism is the incipience to long-term and large-scale magmatism in this region. A near east-west (Ew) trend volcanic belt was distributed across south Hunan, south Jiangxi and southwest Fujian was formed during early J2 time. Along this belt from the inland toward the coast, the lithology of basalts changes from alkali into tholeiite, and the amount of erupted volcanic rocks and the proportions of rhyolites coexisting with the basalts increase. On the basis of geochemical char- acteristics of these basalts, we infer that the melting degree of source rocks and the extent of frac- tional crystallization and crustal contamination all increased whereas the depth of mantle source de- creased from the inland to the coast, which led to the variations of geological characteristics of the volcanic belt. In early J2, the western spreading Pacific plate began to subduct underneath sE China continental block, reactivating near Ew trend deep fault that was originally formed during the Indos- inian event. The stress of the western spreading Pacific plate and the extent of asthenosphere up- welling increased from the inland to the coast, which is consistent with the generation and evolution of early J2 basalts.

关键词： early J2 basalts, upwelling of asthenosphere, large-scale magmatism, sE China, the Pacific plate.

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Almandine megacrysts from Yingfengling Cenozoic basalt in Leizhou Peninsula and their parental magma origin

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Chinese science Bulletin 2001年第14期46卷 1215-1219页

作者： YU Jinhai & s. Y. O’Reilly1. national key Laboratory of Metallogenic Mechanism of Endogenetic Deposits, department of {3. sciences, nanjing university, nanjing 210093. China 2. national key Center of gemoc, department of earth and planetary sciences, macquarie university, north Ryde, nsw 2109, australia national key Laboratory of Metallogenic Mechanism of Endogenetic Deposits Department of Earth Sciences Nanjing University Nanjing China national key Center of gemoc Department of Earth and Planetary Sciences Macquarie University North Ryde Australia

The garnet megacrysts from Yingfengling basalts are characterlzed by high FeO (>20%), CaO (7.02% -8.16%) and low MgO (5.88%-10.87%). significant composition variations are observed in these megacrysts, of which ni, V, sc, Co, and HREE are positively correlated with their Mg# and Zr, Hf, Ga, Y, sr, nb, Zn and LREE-MREE are negatively correlated with Mg#. Megacryst parent magma is a highly evolved residual melt with strongl depletion in Ti, sr, Hf, nb and HREE. This parental magma was generated by more than 60% of crystallization fractionation of clinopyroxene, garnet, plagioclase and ilmenite from quartz tholeiitic magma. It has not erupted to the surface, but stayed at the upper mantle and formed the megacrystic cumulate. Megacrysts and their host basalt are in disequilibrium.

关键词： almandine megacryst geochemistry LAM-ICPMs Lei-zhou Peninsula.

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Three stages of Zircon Growth in Magmatic Rocks from the Pingtan Complex,Eastern China

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Acta Geologica sinica(English Edition) 2007年第1期81卷 68-80页

作者： wAnG Xiang w. L. GRIFFIn s. Y. O＇REILLY LI wuxian state key Laboratory for Mineral Deposit Research Department of Earth Sciences Nanjing University Nanjing Jiangsu 210093 China gemoc arc national {3. Center Department of Earth and Planetary Sciences Macquarie University NSW 2109 Australia CsIRO Exploration and Mining North Ryde NSW 2113 Australia

Morphological and chemical studies on zircon grains from gabbro and granite of the Pingtan magmatic complex, Fujian Province, eastern China, show that there are three stages of zircon growth. The early stage of zircon growth is characterized by colorlessness, high transparence and birefringence, low and dispersive Ipr and Ipy, weak and homogeneous BsE brightness, lower Hf content and depletion of U, Th and Y; the middle stage is characterized by abruptly increasing lpy, progressively strong and sectoral-zoning BsE brightness, higher Hf content and enrichment of U, Th and Y with Th/U 〉 1; the late stage of growth is characterized by brownish color, poor transparence, low birefringence, highest Ipr and Ipy, middle and oscillatorily-zoning BsE brightness, highest contents of Hf, U and Y with Th/U 〈 1. The stages are considered to be formed in a deep magma chamber, ascent passage and emplacement site, respectively. Due to the more or less long residual time of the magma chamber, the difference in age between the early and late stages of zircon might be great enough to be distinguished, which can be attributed to tectonic constraint for the magnlatism.

关键词： zircon three stages of crystal growth typology trace element magmatic rock

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Finding of ancient materials in Cathaysia and implication for the formation of Precambrian crust

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Chinese science Bulletin 2007年第1期52卷 13-22页

作者： YU JinHai Y s O'REILLY wAnG LiJuan w L GRIFFIn JIAnG shaoYong wAnG RuCheng XU Xisheng state key Laboratory for Mineral Deposit Research Department of Earth Sciences Nanjing University Nanjing 210093 China gemoc arc national {3. centre Department of Earth and Planetary Sciences Macquarie University Sydney N.S.W. 2109

在 nanxiongarea 从帕拉片麻岩为 56 由岩屑形成的锆石标明日期的 U-Pb，北广东省，显示在 Cathaysiahinterland 的最近的 neoproterozoic 沉积由众多的 Grenvillian 和 neoarchaean 组成碎屑状的材料，以及 someMesoproterozoic 岩屑... 详细信息

在 nanxiongarea 从帕拉片麻岩为 56 由岩屑形成的锆石标明日期的 U-Pb，北广东省，显示在 Cathaysiahinterland 的最近的 neoproterozoic 沉积由众多的 Grenvillian 和 neoarchaean 组成碎屑状的材料，以及 someMesoproterozoic 岩屑。次要的 Paleoarchaean (3.76 Ga ) 和 Mesoarchaean (3.0—3.2 Ga ) 锆石，是在华南的最旧的锆石，第一也在沉积被发现，建议卡赛西亚·布洛克可以包含很旧的材料。thirty-sevenzircons 的 Hf 同位素作文表明这些碎屑状的材料有不同起源。次要的锆石从产生从的岩浆结晶相对少年外壳，当大多数锆石的父母岩浆从古老的外壳被导出时。U-Pb 标明日期和这些锆石的 Hf 同位素分析的集成建议在 Cathaysia 块的少年外壳的产生主要发生在 2.5 点—2.6Ga。Mesoarchaean (3.0—3.3.Ga ) ，迟了的 Paleoproterozoic (～ 1 .8 Ga ) 和 Paleoarchaean (～ 3..7 Ga ) 可以也是外壳的生长的重要事件。Grenvillian magmatism 是极其强烈的，但是它主要涉及与少年外壳的很少形成古老的外壳的部件再循环。～ 2 .1 Ga Hf 模型年龄的 Themarked 存在和有结晶化的锆石的缺席在～ 2 .1 Ga 变老建议许多锆石的父母岩浆可能从由 neoarchaean 和迟了的 Paleoproterozoic 材料组成的混合来源被导出。

关键词：前寒武纪地层历史地理地理研究

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Transition-Zone Mineral Assemblages in Peridotite Massifs, Tibet: Implications for Collision-zone Dynamics and Orogenic Peridotites

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Acta Geologica sinica(English Edition) 2015年第A2期89卷 90-91页

作者： w. L. GRIFFIn n.M. MCGOwAn J. M. GOnZALEZ-JIMEnEZ E. A. BELOUsOVA D. HOwELL J. C. AFOnsO YAnG J.s sHI R suzanne Y. O'REILLY n. J. PEARsOn CCFs/gemoc Earth and Planetary Sciences Macquarie University NSW 2109 Australia state key Laboratory for Continental Tectonics and Dynamics CAGS Beijing 100037 China Institute for Tibetan Plateau Research CAS Beijing 100085 China

Diamonds have been reported from Tibetan ＂ophiolites＂ for 〉3. years, but have been widely dismissed as contaminants, because their unusual morphology and light C （δ13.=-18 to -27） are unlike those of kimberlitic diamonds. However, the diamonds have now been found in situ in both the chromitites and the peridotites of ＂ophiolites＂ along the Yarlung-Zangbo suture （Tibet） and the Polar Urals （Yang et al., 2014）.

关键词： MInERALs PERIDOTITE DIAMOnDs IGnEOUs rocks CRUsT of the earth

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Grenvillian orogeny in the southern Cathaysia Block:Constraints from U-Pb ages and Lu-Hf isotopes in zircon from metamorphic basement

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Chinese science Bulletin 2008年第19期53卷 3037-3050页

作者： wAnG LiJuan YU JinHai s.Y. O'REILLY w.L. GRIFFIn sUn Tao wEI ZhenYang JIAnG shaoYong sHU Liangshu state key Laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing 210093 China gemoc national key {3. Department of Earth and Planetary Science Macquarie University Sydney NSW 2109 Australia

Metamorphic basement rocks in the Cathaysia Block are composed mainly of meta-sedimen.s.w.th different ages. new zircon U-Pb geochronological results from the meta-sedimentary rocks exposed in the Zengcheng and Hezi areas, southern Cathaysia Block, show that they consist dominantly of early neoproterozoic (1.0―0.9 Ga) materials with minor Paleo- to Mesoproterozoic and late neoproterozoic (0.8―0.6 Ga) components, suggesting that the detritus mostly come from a Grenvillian orogen. The youngest detrital zircon ages place a constraint on the deposition time of these sediments in Late neoproterozoic. Zircon Hf isotopic compositions indicate that the Grenvillian zircons were derived from the reworking of Mesoproterozoic arc magmatic rocks and Paleoproterozoic continental crust, implying an arc-continent collisional setting. single-peak age spectra and the presence of abundant euhedral Grenvillian zircons suggest that the sedimentary provenance is not far away from the sample location. Thus, the Grenvillian orogen probably preexisted along the southern margin of the Cathaysia Block, or very close to the south. similarity in the ages of Grenvillian orogeny and the influence of the assembly of Gondwana in south China with India and East Antarctic are discussed, with suggestion that south China was more likely linked with the India-East Antarctica continents in Early neoproterozoic rather than between western Laurentia and eastern australia.

关键词：华夏古大陆格伦维尔期锆石同位素新元古代

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Cold plumes trigger contamination of oceanic mantle wedges with continental crust-derived sediments:Evidence from chromitite zircon grains of eastern Cuban ophiolites

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Geoscience Frontiers 2018年第6期9卷 1921-1936页

作者： J.A.Proenza J.M.González-Jiménez A.Garcia-Casco E.Belousova w.L.Griffin C.Talavera Y.Rojas-Agramonte T.Aiglsperger D.navarro-Ciurana n.Pujol-solà F.Gervilla s.Y.O’Reilly D.E.Jacob Departament de Mineralogia Petrologia i Geologia AplicadaUniversitat de BarcelonaC/Martíi Franquès s/n08028BarcelonaSpain Departamento de Mineralogía y Petrología Universidad de GranadaFacultad de CienciasFuentenueva s/n 18002GranadaSpain Instituto Andaluz de Ciencias de la Tierra(CsIC-UGR) Avda.de las Palmeras 4E-18100ArmillaGranadaSpain arc centre of Excellence for Core to Crust Fluid systems(CCFs) GEMOC National Key CentreDepartment of Earth and Planetary SciencesMacquarie UniversitySydneyNSW 2109Australia John de Laeter centre Curtin UniversityPerthWA 6102Australia Geocycles-earth system Research Center Institut fur GeowissenschaftenJohannes Gutenberg-UniversitatBecherweg 21D-55099 MainzGermany Departamento de Geociencias Universidad de los AndesBogotáColombia

The origin of zircon grains, and other exotic minerals of typical crustal origin, in mantle-hosted ophiolitic chromitites are hotly debated. we report a population of zircon grains with ages ranging from Cretaceous(99 Ma) to neoarchean(2750 Ma), separated from massive chromitite bodies hosted in the mantle section of the supra-subduction(ssZ)-type Mayari-Baracoa Ophiolitic Belt in eastern Cuba. Most analyzed zircon grains(n = 20, 287 ± 3.Ma to 2750 ± 60 Ma) are older than the early Cretaceous age of the ophiolite body, show negativeε_(Hf)(t)(-26 to-0.6) and occasional inclusions of quartz, K-feldspar,biotite, and apatite that indicate derivation from a granitic continental crust. In contrast, 5 mainly rounded zircon grains(297±5 Ma to 2126±27 Ma) show positive εHf(t)(+0.7 to +13.5) and occasional apatite inclusions, suggesting their possible crystallization from melts derived from juvenile(mantle)sources. Interestingly, younger zircon grains are mainly euhedral to subhedral crystals, whereas older zircon grains are predominantly rounded grains. A comparison of the ages and Hf isotopic compositions of the zircon grains with those of nearby exposed crustal terranes suggest that chromitite zircon grains are similar to those reported from terranes of Mexico and northern south America. Hence, chromitite zircon grains are interpreted as sedimentary-derived xenocrystic grains that were delivered into the mantle wedge beneath the Greater Antilles intra-oceanic volcanic arc by metasomatic fluids/melts during subduction processes. Thus, continental crust recycling by subduction could explain all populations of old xenocrystic zircon in Cretaceous mantle-hosted chromitites from eastern Cuba *** integrate the results of this study with petrological-thermomechanical modeling and existing geodynamic models to propose that ancient zircon xenocrysts, with a wide spectrum of ages and Hf isotopic compositions, can be transferred to the mantle wedge above subducting slabs by

关键词： Zircon U-Pb geochronology Chromitites Cold plumes Ophiolites Cuba

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Formation history and protolith characteristics of granulite facies metamorphic rock in Central Cathaysia deduced from U-Pb and Lu-Hf isotopic studies of single zircon grains

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Chinese science Bulletin 2005年第18期50卷 2080-2089页

作者： YU Jinhai ZHOU Xinmin Y. s. O'Reilly ZHAO Lei w. L. Griffin wAnG Rucheng wAnG Lijuan CHEn Xiaomin state key Laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing 210093 China gemoc arc national {3. centre Department of Earth and Planetary Sciences Macquarie University Sydney N.S.W. 2109 Australia

The petrochemical as well as zircon U-Pb and Lu-Hf isotopic studies of granulite facies metamorphic rock from the Taoxi Group in eastern nanling Range, Central Cathaysia indicate that its protolith is the sedimentary rock with low maturation index. The clastic materials are mostly from middle neoproterozoic (~73. Ma) granitoid rocks with minor neoarchaean and Paleoproterozoic rocks. The timing of this neoproterozoic magmatism is in agreement with the second period of magmatism widespread surrounding the Yangtze Block. Hf isotopic data indicate that the neoproterozoic granitoids resulted from the recycled Paleoproterozoic mantle-derived crustal materials. The sedimentary rock was deposited in Late neoproterozoic Era, and carried into low crust in Early Paleozoic. The partial melting of the meta-sedimentary rock took place at about 480 Ma and subsequently granulite facies metamorphism occurred at ca. 443.Ma. The zircons forming during this time interval (Early Paleozoic) show large Hf isotope variations, and their -Hf(t) values increase from -13.2 to +2.3. with decreasing age, suggesting the injection of mantle-derived materials during partial melting and metamorphism processes in the Early Paleozoic. Calculation results show that this metamorphic rock, if evolved to Mesozoic, has similar isotopic composition to the nearby Mesozoic high si peraluminous granites, implying that this kind of granulite facies metamorphic rock is probably the source material of some Mesozoic peraluminous granitoids in eastern nanling Range.

关键词：麻粒岩锆石同位素变质结构沉积岩石

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In situ Re-Os isotope ages of sulfides in Hannuoba peridotitic xenoliths: significance for the frequently-occurring mantle events beneath the north China Block

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Chinese science Bulletin 2007年第20期52卷 2847-2853页

作者： YU ChunMei ZHEnG JianPing GRIFFIn w L Faculty of earth sciences China University of Geosciences Wuhan 430074 China state key Laboratory of Geological Processes and Mineral Resource China University of Geosciences Wuhan 430074 China gemoc arc national {3. Center Department of Earth and Planetary Sciences Macquarie University Sydney NSW 2109 Australia

In situ Re-Os isotopes of sulfides in peridotitic xenoliths from Cenozoic Hannuoba basalts were analyzed by LAM-MC-ICPMs. The suifides developed two types of occurrences including silicate-enclosed and interstitial. In the enclosed sulfides, 187Os/188Os vary from 0.1124 to 0.13.2 and 187Re/188Os from 0.0026 to 1.8027. In the interstitial ones, 187Os/188Os have a range from 0.1174 to 0.13.4 and 187Re/188Os from 0.03.5 to 1.4469. The oldest age, calculated by TRD for the enclosed sulfides, is 2.1 Ga. An isochron age of 2.3.1.2 Ga is obtained by five grains of enclosed sulfides and primitive mantle. The sulfides used have lower Re-Os isotopic ratio than primitive mantle. Meanwhile, an isochron age of 645±225 Ma is given by all in- terstitial sulfides and the enclosed sulfides with higher Re-Os isotopic ratio due to Re addition after man- tle formation. In addition, the model age of 1.3.Ga recorded by one interstitial sulfide, having similar TDM and TRD, should be meaningful to deep thermal event. The coexistence of different ages, revealed by in situ Re-Os isotope, indicates frequently-occurring mantle events beneath Hannuoba area.

关键词：地幔捕虏体中国北方矿石

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Element diffusion ability in metasomatic agents and its effect on chemical characteristics of metasomatized peridotites

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science China earth sciences 2006年第9期49卷 926-937页

作者： Y s O’Reilly gemoc arc national {3. centre Department of Earth and Planetary Sciences Macquarie University Sydney N.S.W. 2109 Australia

Detailed in situ LM-ICPMs researches on the composite xenoliths from Yingfengling volcano of Leizhou Peninsula, south China, indicate that most incompatible trace elements of clino- pyroxenes in composite xenoliths decrease spatially from pyroxenites to distal lherzolites, and com- patible elements and HREE increase steeply. The increasing and decreasing rate is distinct for dif- ferent trace elements, which give rise to element chromatographic fractionation within metasomatized lherzolites. The element chromatographic fractionation result actually from the difference in element diffusive rate in melts or fluids percolating through wall-rock lherzolites. Based on element variation profiles in composite xenoliths this study indicates that sr, nb, La and Ce have the highest diffusive mobility, MREE-HREE are moderate, and Zr, Hf, Ti, Ga and sc are very low in most cases. Higher diffusive rates of LREE than HREE would enlarge the REE fractionation of metasomatized peridotites, and lower diffusive rate of Zr, Hf and Ti relative to neighbor REEs with similar incompatibility would cause the relative depletion of these elements in metasomatized peridotites. Trace elements com- monly have a higher diffusive rate in fluid-rich infiltrating melt, which will weaken element chroma- tographic fractionation during the metasomatism. The range of mantle metasomatism caused by sili- cate melt intrusion is very limited, generally within tens of centimeters wide. The width of metasoma- tized wall-rock peridotites near the pyroxenite or horblendite veins was strictly controlled by both melt volume and chemical characteristics.

关键词： composite xenolith, metasomatism, chromatographic fractionation, diffusive rate, Leizhou Peninsula.

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