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Occurrences of Excess ^(40)Ar in Hydrothermal Tourmaline: Interpretations from ^(40)Ar-^(39)Ar Dating Results by Stepwise Heating

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Acta Geologica Sinica(English Edition) 2007年第3期81卷 510-516页

作者： qiu huaning PU Zhiping DAI Tongmo Key Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences P.O. Box 1131 Guangzhou Guangdong 510640

The occurrences of excess ^40Ar within a hydrothermal tourmaline is discussed in term of the analysis data of syngenetic muscovite and tourmaline from the Lushui hydrothermal tin-tungsten deposit in western Yunnan, China, using the ^40Ar-^39Ar stepwise heating technique. About 80% excess ^40 Ar was released in the last step when the tourmaline was fused, corresponding to a release of only -3% ^39 Ar （K）, which indicates that most excess ^40 Ar was held in the mineral lattice rather than in the channels parallel to the Z-axis. This suggests that the excess ^40 Ar was incorporated during crystallization and not diffused into the tourmaline during the post-crystallization history.

关键词： excess ^40 Ar tourmaline, ^40 Ar-^39 Ar stepwise heating hydrothermal tin-tungsten deposit Yunnan

Geochronological and geochemical constraints on the Cuonadong leucogranite, eastern Himalaya

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Acta Geochimica 2018年第3期37卷 347-359页

作者： Jiajia Xie huaning qiu Xiujuan Bai Wanfeng Zhang Qiang Wang Xiaoping Xia State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640 China Key Laboratory of Tectonics and Petroleum Resources(China University of Geosciences Wuhan) Ministry of Education Wuhan 430074 China University of Chinese Academy of Sciences Beijing 100049China

First comprehensive investigations of the Cuonadong leucogranite exposed in North Himalayan gneiss dome of southern Tibet are presented in this *** SIMS U–Pb ages of oscillatory zircon rims scatter in a wide range from 34.1 to 16.0 Ma, and the Cuonadong leucogranite probably emplaced at 16.0 Ma. High-precision ^(40)Ar/^(39)Ar dating on a muscovite sample yields an essentially flat age spectrum with consistent plateau and isochron ages, indicating that the Cuonadong leucogranite cooled below 450 °C at 14 Ma. Based on the youngest zircon U–Pb age and muscovite^(40)Ar/^(39)Ar age, the Cuonadong leucogranite experienced rapid cooling with a rate of 119 °C/Myr from 16 to 14 Ma. The geochronological data of this undeformed leucogranite also suggest that the ductile extension of the South Tibetan Detachment System in the eastern Himalaya ceased by ca. 14 Ma. Furthermore,the initial Sr–Nd isotopic compositions and Nd model ages demonstrate that the leucogranite was derived from metapelitic source within the Greater Himalayan Crystalline Complex. The distinct Ba depletion with high Rb/Sr ratios and negative Eu anomalies make it clear that the leucogranite melts were generated by breakdown of muscovite under fluid-absent conditions.

关键词： Leucogranite SIMS zircon U-Pb dating 40Ar/39Ar dating Geochemistry North Himalaya

Opening and evolution of the South China Sea constrained by studies on volcanic rocks:Preliminary results and a research design

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Chinese Science Bulletin 2012年第24期57卷 3150-3164页

作者： XU YiGang WEI JingXian qiu huaning ZHANG HuiHuang HUANG XiaoLong State Key Laboratory of lsotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Graduate University of Chinese Academy of Sciences Beijing 100049China

The South China Sea (SCS) is characterized by abundant seamounts, which provide important information about the evolution of the SCS and related deep processes. Cenozoic volcanism in the SCS and its surroundings comprises three stages relative to the spreading of the SCS:prespreading (>32 Ma), syn-spreading (32-16 Ma), and post-spreading (<16 Ma). The pre-spreading magmatism predominantly occurs on the northern margin of the SCS and in South China coastal areas and shows a bi-modal affinity. The syn-spreading magmatic activity was very limited on the periphery of the SCS, but may be concentrated in the SCS. However, seafloor samples of this stage are not available yet because of overlying thick sedimentary deposits. Post-spreading magmatism is widespread in the central and southwest sub-basins of the SCS, Hainan Island, Leizhou Peninsula, Thailand, and Vietnam. These are mainly alkali basalts with subordinate tholeiites, and display OIB-type geochemical characteristics. The Dupal isotope anomaly and presence of high-magnesian olivine phenocrysts suggests their possible derivation from the Hainan mantle plume. The temporal and spatial distribution of Cenozoic volcanism in the SCS and its surroundings may be accounted for either by plate stress re-organization before and after SCS spreading, or by ridge suction of plume flow during opening of the SCS. If the latter is the case, the volcanic rocks within the SCS basin may not be typical mid-ocean ridge basalts (MORB). It remains puz-zling, however, that the transition between the South China continental margin and the SCS basin does not have features typical of a volcanic rifted margin. Clearly, the relationship between mantle plume and SCS opening needs further evaluation. A better un-derstanding of the link between deep processes and opening of the SCS not only requires enhanced studies on igneous petrogene-sis, but also is heavily dependent on systematic sampling of seafloor rocks.

关键词：中国南海火山岩 DUPAL同位素异常开幕式进化设计海底山脉岩浆活动

Detrital K-feldspar^(40)Ar/^(39)Ar Ages:Source Constraints of the Lower Miocene Sandstones in the Pearl River Mouth Basin,South China Sea

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Acta Geologica Sinica(English Edition) 2012年第2期86卷 383-392页

作者： LIU Zaisheng SHI Hesheng ZHU Junzhang qiu huaning ZHANG Zhilin YUN Jianbing CNOOC China Limited Shenzhen Shenzhen 518067China State Key Laboratory of Isotopic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Hailaer Petroleum Exploration and Development Headquarters PetroChina Daqing Oilfield Company Ltd.Hailar 021000China

The South China Sea began to outspread in the Oligocene. A great quantity of terraneous detritus was deposited in the northern continental shelf of the sea, mostly in Pearl River Mouth Basin, which constituted the main paleo-Pearl River Delta. The delta developed for a long geological time and formed a superimposed area. Almost all the oil and gas fields of detrital rock reservoir distribute in this delta. Thirty-three oil sandstone core samples in the Zhujiang Formation, lower Miocene （23-16 Ma）, were collected from nine wells. The illite samples with detrital K feldspar （Kfs） separated from these sandstone cores in four sub-structural belts were analysed by the high-precision 40Ar/39Ar laser stepwise heating technique. All 33 illite 40Ar/39Ar data consistently yielded gradually rising age spectra at the low-temperature steps until reaching age plateaus at mid-high temperature steps. The youngest ages corresponding to the beginning steps were interpreted as the hydrocarbon accumulation ages and the plateau ages in mid-high temperature steps as the contributions of the detrital feldspar representing the ages of the granitic parent rocks in the provenances. The ages of the detrital feldspar from the Zhujiang Formation in the four sub-structural belts were different：（1） the late Cretaceous ages in the Lufeng 13 fault structural belt; （2） the late Cretaceous and early Cretaceous-Jurassic ages in the Huizhou 21 buried hill-fault belt; （3） the Jurassic and Triassic ages in the Xijiang 24 buried hill-fault belt; and （4） the early Cretaceous - late Jurassic ages in the Panyu 4 oil area. These detrital feldspar 4~Ar/39Ar ages become younger and younger from west to east, corresponding to the age distribution of the granites in the adjacent Guangdong Province, Southern China.

关键词： Illite detrital K feldspar 40Ar/39Ar dating parent rock sandstone reservoir Pearl River Mouth Basin

Retrograde metamorphism of the eclogite in North Qaidam,western China:Constraints by joint ^(40)Ar/^(39)Ar in vacuo crushing and stepped heating

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Geoscience Frontiers 2015年第5期6卷 759-770页

作者： Rongguo Hu Jan Wijbrans Fraukje Brouwer Linghao Zhao Min Wang huaning qiu State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences Department of Earth Sciences VU University Amsterdam University of Chinese Academy of Sciences

Two amphiboles and a syn-metamorphic quartz vein from the Yuka terrane,North Qaidam,western China,have been analyzed by joint40Ar/39Ar crushing in vacuo and stepwise heating *** crushing in vacuo results provide information to directly constrain the timing of fluid activity and the age of amphibolite-facies *** stepwise heating results could further be used to decipher the thermal history of the UHP *** from amphibolites and quartz vein within garnetamphibolite lens analyzed by in vacuo crushing yield similarly shaped age spectra and exhibit relatively flat age plateaus for the last several *** characteristics of gas release patterns and geochronological data testify to the presence of significant excess40Ar within the fluid *** age plateaux with weighted mean ages（WMA） ranges from 488 to 476 Ma for amphiboles and 403 Ma for quartz（2σ）.These data points constitute amphibole WMA yielding excellent isochrons with isochron ages of 469 and 463 Ma with initial40Ar/36Ar ratios of 520 and 334,*** isochron ages are interpreted to represent initial amphibolite-facies *** data points constituting the quartz age plateaux give an isochron age of 405 Ma with initial40Ar/36Ar ratio of 295,recording a significant aqueous fluid flow episode during the early *** spectra obtained by stepwise heating of amphibole residues remaining after crushing experiments are characterized by younger and relatively complex age spectra,which are probably influenced by the combined effects of resetting argon and/or mineral ***,we note that the spectra shapes have features in common:excluding the last two steps,minimum apparent ages are found at temperatures of around 500 ℃,corresponding to319 and 249 Ma,perhaps representing the time of isotopic resetting or resulting from release gas from mineral inclusions of,e.g.,biotite or *** apparent ages are obtained at temperatures of aro

关键词： 40Ar/39Ar techniques In vacuo crushing Amphibolite

Structural Features and Proto-Type Basin Reconstructions of the Bay of Bengal Basin:A Remnant Ocean Basin Model

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Journal of Earth Science 2017年第4期28卷 666-682页

作者： Peng Zhang Lianfu Mei Ping Xiong Xiaolin Hu Renyuan Li huaning qiu Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China College of Marine Science and Technology China University of GeosciencesWuhan 430074China Research Institute China National Offshore Oil Corporation(CNOOC)Beijing 100027China Key Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China

Remnant ocean basin is a key to understand the plate suturing and subsequent uplift and erosion of orogen. The Bay of Bengal Basin （BOBB） provides a typical example to analyze the remnant ocean basin structures, evolution, and relationships between depositional filling and uplifting of the Himalayan Orogen. Thirty-nine seismic profiles as well as interval velocities of well BODC3 were used to compile isopach maps of the basin. Among the seismic data, 26 seismic profiles were applied to estab- lish 8 cross sections. The cross sections suggest the basin is asymmetric, bounded to the west by the eastern continental margin of India （ECMI） with graben-horst and to the east by the Sunda conver- gence margin dominated by trench-arc system. The BOBB is characterized by a prominent down flex- ure structures caused by huge amount of Bengal fan turbidite sediments accumulation. Our isopach maps and chronology data collected from adjacent regions reveal the initial development and fast southward growth of the Bengal fan were related to the early and major stage uplift and erosion of the Himalayan Orogen, respectively. The BOBB has experienced a critical transition from an ocean basin to a remnant ocean basin at Late Oligocene. Such basin structures and evolution features indicate the BOBB provides whole records of oblique convergence of the India and Asia plates, and the early and major stage evolution of the Himalayan Orogen.

关键词： basin structures prototype-basin reconstructions remnant ocean basin the Bay of Bengal Basin India-Asia collision Bengal fan.

A novel purification technique for noble gas isotope analyses of authigenic minerals

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Science China Earth Sciences 2016年第10期59卷 111-117页

作者： HE LiYan qiu huaning SHI HeSheng ZHU JunZhang BAI XiuJuan YUN JianBing State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Exploration Department of CNOOC Ltd. Beijing 100010China CNOOC Limited-Shenzhen Shenzhen 518067China Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China Exploration Department of Daqing Oilfield Co.Ltd. Daqing 163712China

Noble and active gases are released from geological samples during gas extraction for noble gas isotope analyses. The active gases should be removed before inletting to mass spectrometers for the analyses. The normal noble gas preparation systems can clean up most geological samples. However, authigenic minerals from sedimentary rocks in oil/gas fields contain organic matter, which cannot be cleaned up by the normal preparation systems and thus influence the noble gas analyses. We introduce a novel gas purification system （PRC patent No. ZL201320117751.2）, which includes several reversible purification pumps with different absorbing and degassing temperatures. It can well clean up water steam, carbon dioxide and organic gas- es. Mica minerals are often used for 40Ar/39Ar dating. A muscovite sample （2082MS） which could not be cleaned up by the normal preparation system with two SAES NP10 getters, becomes the test sample for a comparative experiment in this study. The experiment is assigned into 4 sections with the organic gas removal system （OGRS）＂Closed/Opened＂ in turn. When the OGRS is closed only with two NP10 getters for purification, the 40At intensities increase in curves with inlet time because of impurities, the 40Ar/39Ar dating results yield age errors about ＋2%-±1% （20-）. When the OGRS is opened for purification, in contrast, the 40Ar intensities decrease linearly with inlet time. This indicates that the gases have been cleaned up effectively, and the 40Ar/39Ar results yield ages with errors in ±0.4%. The OGRS is very helpful to obtain high-quality analysis data.

关键词： 40Ar/39Ar dating Gas purification technique Organic impurity Noble gas

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CO_2 gas emplacement age in the Songliao Basin: Insight from volcanic quartz ^(40)Ar-^(39)Ar stepwise crushing

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Chinese Science Bulletin 2010年第17期55卷 1795-1799页

作者： YUN JianBing WU HeYong FENG ZiHui MEI LianFu qiu huaning lKey Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Research Institute of Exploration and Development Daqing Oilfield Company Ltd Daqing 163712 China Graduate University of Chinese Academv of Sciences Beijing 100049 China Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences Wuhan) Ministry of Education Wuhan 430074 China

Due to a lack of suitable minerals, the gas/oil emplacement ages have never been accurately obtained before. CH4-CO2-saline- bearing secondary inclusions are found in quartz from the volcanic rocks of the Yingcheng Formation, the container rocks of the deep CO2 gas reservoir in the Songliao Basin. The inclusion fluid was trapped into microcracks in quartz during the gas em- placement and accumulation, providing an optimal target for the 40Ar-39Ar stepwise crushing technique to determine the CO2 gas emplacement age. 40Ar-39Ar dating results of a quartz sample by stepwise crushing yield a highly linear-regression isochron with an age of 78.4±1.3 Ma, indicating that the accumulation of the deep CO2 gas reservoir in the Songliao Basin occurred in the late Cretaceous. This is the first time to report an exact isotopic age for a CO2 gas reservoir, which indicates that the 40Ar-39Ar dating can serve as a new technique to date the oil/gas emplacement ages.

关键词：二氧化碳气体侵位年龄松辽盆地粉碎技术火山岩石英二氧化碳气藏同位素年龄

流体包裹体^(40)Ar/^(39)Ar定年技术与应用

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地球科学 2019年第3期44卷 685-697页

作者：邱华宁白秀娟中国地质大学构造与油气资源教育部重点实验室湖北武汉430074

同位素地质年代学的各种定年方法都有其特定的测定对象(矿物或全岩)和适用范围,致使许多金属矿床难以进行年龄测定.为解决此难题,建立了流体包裹体^(40)Ar/^(39)Ar定年方法,经过30年的探索发展和不断改进完善,已广泛应用于热液矿床、变... 详细信息

同位素地质年代学的各种定年方法都有其特定的测定对象(矿物或全岩)和适用范围,致使许多金属矿床难以进行年龄测定.为解决此难题,建立了流体包裹体^(40)Ar/^(39)Ar定年方法,经过30年的探索发展和不断改进完善,已广泛应用于热液矿床、变质岩和石英脉的形成年龄测定,甚至成功应用于松辽盆地深层天然气成藏年龄研究.在详细介绍流体包裹体提取技术和气体纯化技术的基础上,着重总结我们团队运用流体包裹体^(40)Ar/^(39)Ar定年技术在热液矿床和天然气藏形成年龄研究方面取得的重要成果,以及气体混合线的概念及其年龄意义.

关键词： 40Ar/39Ar定年流体包裹体成矿年龄油气成藏年龄