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Single zircon lAM-ICPMS U-Pb dating of Guidong complex(SE China)and its petrogenetic significance

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Chinese Science Bulletin 2003年第17期48卷 1892-1899页

作者： XUXishenq DENGPing S.Y.O'Reilly w.l.griffin ZHOUXinmin TANZhengzhong StateKeylaboratoryforMineralDepositsResearch DepartmentofEarthSciencesNanjingUniversityNanjing210093China ResearchInstituteNo.290 SouthChinaBureauofGeologyCNNEShaoguan512026China ARCNationalKeyCentreforthe-GeochemicalEvolutionandMetal-logenyofContinents MacquarieUniversityNSW2109Australia

Single zircon lAM-ICPMS U-Pb dating indi-cates that the Guidong granitic complex is a multistage ba-tholith formed during Indosinian-Yanshanian time. The luxi body (239 ± 5 Ma) and the Xiazhuang body (235.8 ± 7.6 Ma) intruded during Indosinian time, whereas the Aizi body (160.1 ± 6.1 Ma) and the Siqian body (151 ± 11 Ma) formed during Yanshanian time. Inherited zircons (1275—2137 Ma) in the Xiazhuang body imply that at least part of the source rocks of the Guidong complex are from the Proterozoic basement of southeast China. Detailed single zirconlAM-ICPMS U-Pb dating results provide important evi-dence for understanding the evolution, tectonic setting andmineralisation of the complex.

关键词：中国东南部成岩作用锆石 U-Pb测年电感耦合等离子体质谱法花岗岩

Determination of Calcium in Olivine by Proton Microprobe and Its Implication

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Chinese Science Bulletin 1993年第5期38卷 396-399页

作者：陈道公 S.Y.O'Reilly w.l.griffin University of Science and Technology of China Hefei 230026 PRC School of Earth Science Macquarie University NSW 2109 Australia. Division of Exploration Geosciences CSIRO North Ryde NSW 2113 Australia.

Ca is a minor component of olivine (oliv). Its concentration measured by electron microprobe (EMP) is about 0.1—0.5%, which is close to the minimum detection limit. As Ca distribution between oliv and clinopyroxene (cpx)has the possibility of being used as geothermobarometers, it is very important to measure accurately the Ca content in oliv. Proton-induced X-ray emission (PIXE) technique as a new high energy analysis method shows advantage in high sensitivity and accuracy of microanalyses and begins to be

关键词： calcium olivine proton microprobe mantle.

Trace Element Composition of Clinopyroxene From Mantlederived Peridotite Xenoliths

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Chinese Science Bulletin 1993年第14期38卷 1186-1189页

作者：陈道公 S.Y.O'Reilly w.l.griffin University of Science and Technology of China Hefei 230026 PRC School of Earth Sciences Macquarie Univeristy NSW 2109 Australia Division of Exploration Geoscience CSIRO North Ryde 2113 Australia

Knowledge of the trace element distributions and concentrations in main mineral phases of mantle-derived rocks is particularly useful for understanding the partial melting, depletion and enrichment processes, and metasomatism in the earth’s mantle. Trace element data on mantle peridotites were usually obtained with large uncertainty by neutron activation analysis in China previously. we have determined trace element concentration of 173 grains of clinopyroxene (cpx) in 50 peridotite xenoliths from different areas in China using the pro-

关键词： trace element clinopyroxene mantle.

U-Pb dating of zircons from quartz diorite and its enclaves at Tongguanshan in Anhui and its petrogenetic implication

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Chinese Science Bulletin 2004年第19期49卷 2073-2082页

作者： XUXisheng FANQincheng S.Y.O'Reilly JIANGShaoyong w.l.griffin wANGRucheng QIUJiansheng StateKeylaboratoryforMineralDepositsResearch.DepartmentofEarthSciences NanjingUniversity.Nanjing210093.China ARCNationalKeyCentrefortheGeochemicalEvolutionandMetallogenyofContinents MacquarieUniversity.NSW2109Australia

The genesis of intermediate-silicic intrusive rocks and their enclaves in Tongling are closely related to Fe, Cu mineralization, which may provide petrologic informa- tion on lithospheric dynamics in this region. Tongguanshan quartz diorite and its enclaves, representatives of the Meso- zoic intermediate-silicic intrusive rocks in the Tongling area, were studied using approaches of petrography, electron microprobe mineral chemistry and the lA-ICPMS zircon U-Pb dating. The chemical compositions of pyroxene and amphibole in pyroxene-amphibole cumulate, quartz-diorite host rock from Tongguanshan show correlative variations. The Al contents of the minerals in pyroxene-amphibole cu- mulate are higher than those in the host rocks, indicating that the cumulate crystals were crystallized before the em- placement of host magma. The consistent mineral chemical compositions between the Tongguanshan quartz diorite and the microgranular diorite enclave indicate that the enclave and host rock were crystallized under similar conditions and therefore are closely genetically related. The lA-ICPMS zircon U-Pb dating suggests that the crystallization age of Tongguanshan quartz diorite is 137.5±1.1 Ma, consistent with the previous dates by different methods. However, the present U-Pb dating also revealed the presence of late- Archean relict cores, demonstrating that older lower crustal materials were involved in the generation of Mesozoic mag- matic rocks in this area. Furthermore, the dating results show that the crystallization age of the microgranular diorite enclave is 137.5 ±2.4 Ma, the same as the crystallization age of the host magma. By integrating the previous Sr-Nd-Pb isotope data, it is also discussed the petrogenesis of quartz diorite and its enclaves in Tongguanshan.

关键词： U-Pb年代测定法锆石石英闪长岩安徽岩石成因微晶粒状

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 Key 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

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 Key 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

Zircon U-Pb dating and lu-Hf isotope study of intermediate-mafic sub-volcanic and intrusive rocks in the lishui Basin in the middle and lower reaches of Yangtze River

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Chinese Science Bulletin 2014年第27期59卷 3427-3440页

作者： lijuan wang Jianping Huang Jinhai Yu w. l. griffin Rucheng wang Shaoqin Zhang Yinghe Yang Key laboratory of Earth Fissures Geological Disaster Ministry of Land and Resources Geological Survey of Jiangsu Province Department of Earth Sciences State Key Laboratory for Mineral Deposits Research Nanjing University Department of Earth and Planetary Science ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC Key Centre Macquarie University NSW 2109Australia

Eight Mesozoic sub-volcanic and intrusive rocks in the lishui Basin have been selected for zircon U-Pb dating and lu-Hf isotopic analysis. The laohutou, Datongshan,Daweizhuang, Yeshanao, Yanwaqiao, Xibeishan, Changshantou and Jianshan porphyrites yield concordant early Cretaceous ages of 130.5 ± 1.6 Ma, 136.0 ± 3.4 Ma, 132.7 ±2.7 Ma, 127.0 ± 1.9 Ma, 129.4 ± 1.7 Ma, 133.2 ± 2.1 Ma,131.1 ± 2.3 Ma and 127.4 ± 1.8 Ma, respectively. Zircon eHf(t) values for these rocks range from-3.54 to-9.11, mostly between-3.54 and-5.93, suggesting sources similar to those for coeval igneous rocks in other volcanic basins along the middle and lower reaches of Yangtze River. Considering the geochemical characteristics of coeval magmatic rocks in the middle and lower reaches of Yangtze River and its adjacent areas, this paper proposes a model of slab rollback to explain the Mesozoic magmatism in the east-central part of China continent. In the middle-late Jurassic to early Cretaceous(170–135 Ma), the Pacific plate started to subduct beneath the Eurasian continent, producing a compressive tectonic setting,and magmatism progressed from coast to the inland. The magmas of this period were derived mostly from partial melting of ancient crust. After *135 Ma, the subduction weakened, and the rollback of the subducted Pacific plate produced an extensional environment. This led to the formation of volcanic basins, the partial melting of enriched mantle sources and less ancient crust, and the intrusion of voluminous intermediate-mafic igneous rocks.

关键词：锆石U-Pb定年长江中下游 Hf同位素火山盆地次火山岩侵入岩丽水基性

Trace element characteristics in the diopsides of peridotite xenoliths: a laser ablation-inductively coupled plasma-mass spectrometry study

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Chinese Science Bulletin 1998年第7期43卷 579-583页

作者： Shaohai Chen Xinghua Zhou S. Y. O’Reilly w. l. griffin Guohui Zhang M. Zhang Chinese Acad Sci Inst Geol Lab Lithosphere Tecton Evolut Beijing 100029 Peoples R China Macquarie Univ Sch Earth Sci GEMOC Sydney NSW 2109 Australia

Among the various xenoliths entrained by the Cenozoic Hannuoba basalts, peridotite is the most abundant one. The trace elements of the diopsides from the peridotite xenoliths were analysed by lA-ICP-MS. The overall depletion and some heterogeneity of the continental mantle beneath northern North China Craton were indicated by the characteristics of the trace elements. The ∑REE amount in diopside correlates with the Cr/(Cr+Al) ratio of diopside which is indicative of xenolith’s partial melting degree. As the peridotite hosts and pyroxenite veins show similar REE distribution patterns, the composite xenoliths are probably formed by mantle deformation, rather than by the late metasomatism of mantle fluids/melts.

关键词： lA-ICP-MS diopside trace elements.

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 Centre Department of Earth and Planetary Science Macquarie University Sydney NSW 2109 Australia

Metamorphic basement rocks in the Cathaysia Block are composed mainly of meta-sediments with 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