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Study of the closure temperature of(U-Th)/He in detrital zircon obtained from natural evolution samples

Science China Earth Sciences 2020年第3期63卷 412-424页

作者： Chang'e CAI Nansheng QIU Huili LI Daniel FSTOCKLI Jian CHANG Nian LIU State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Chongqing Key Laboratory of Complex Oil and Gas Field Exploration and Development Chongqing University of Science and TechnologyChongqing 401331China Institute of Petroleum Exploration and Development Northwest Oil CompanySINOPECUrumqi 830011China Jackson School of Geosciences The University of Texas at AustinAustinTX 78712USA

Zircon(U-Th)/He thermochronometry was used as an effective indicator to study the thermal history of deep sedimentary basins with high *** He ages and closure temperatures are very important *** this paper,detrital zircon He closure temperature was studied by establishing the evolutionary pattern between zircon He ages and burial depth of borehole samples obtained from the Cenozoic strata in the Bohai Bay and Tarim basins,which have different thermal *** results show that the zircon He closure temperature of natural evolution samples is 200℃,which is higher than the temperature obtained from thermal simulation experiments(183℃).The temperature range of 140-200℃corresponds to the zircon helium partial retention *** properly understanding zircon He closure temperatures,zircon(U-Th)/He thermochronometry can provide a correct explanation of the He ages,and significant guidance in the study of the evolution of source rocks and the process of hydrocarbon accumulation in deep sedimentary basins.

关键词： Zircon(U-Th)/He Natural evolution sample closure temperature Partial retention zone

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Thermochronologic Constraints on Uplifting Events since the Early Cretaceous in the North Margin of the Luxi Rise, Eastern China

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Journal of Earth Science 2013年第4期24卷 579-588页

作者：王国芝刘树根邹灿 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Department of College English College of Foreign Languages and CulturesChengdu University of Technology

Two ^40Ar/^39Ar ages and six fission track ages from monzonite and the Jurassic- Cretaceous rocks provide new geochronologic constraints on the timing of uplifting events in the north margin of the Luxi （鲁西） rise, eastern China. ^40Ar/^39Ar age 111.1±2.4 and 111.2±2.5 Ma of biotite and K-feldspar sampled from the monzonite may record the cooling age at 300 and 150-300 ℃, respectively. Fission track ages of zircon and apatite from the monzonite changing from 75±7 to 40±3 Ma record the cooling age at 250 and 120 ℃, respectively. The apatite from the Jurassic-Cretaceous sandstone and volcanic rocks yielded a different T-t path. The results indicate that there are two phases 111-46.9 and 13.4 （6.5）-0 Ma of rapid uplifting happened to the north margin of the Luxi rise; the first one is a tilted uplift from north to south in Zibo （淄博） during 111-46.9 Ma and in the south in Mengshan （蒙山） during 70-40 Ma; the second one is a tilted uplift from south to north in Mengshan during 32-20 Ma, and in turn in Taishan （泰山） and Zibo during 23-20 and 13.4-0 or 6.5-0 Ma, respectively. The aging coincidence between magmatism and tectonic uplifting implies there are two phases of uplifting induced by large scale extension and lithospheric thinning.

关键词： Luxi rise apatite fission track T-t path closure temperature uplift.

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Diffusion of Sm-Nd in Scheelite and its Significance to Isotopic Dating and Tracing

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Acta Geologica Sinica(English Edition) 2023年第2期97卷 651-661页

作者： ZHANG Dongliang Ian MCOULSON PENG Jiantang LI Shijie WANG Guoqiang Key Laboratory of Metallogenic Prediction of Nonferrous Metals Ministry of EducationSchool of Geosciences and InfophysicsCentral South UniversityChangsha 410083China Solid Earth Studies Laboratory Department of GeologyUniversity of ReginaReginaSaskatchewan S4S OA2Canada Lunar and Planetary Science Research Center Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Xi'an Center of Geological Survey CGSXi'an 710054China

As the principal ore mineral in various tungsten(-gold)deposits,scheelite(CaWO_(4))plays an important role in directly dating the timing of ore formation,and in tracing associated material sources through the study of its Sm-Nd geochronology and Nd isotopic *** the retention of Sm-Nd systematics within scheelite is presently unconstrained,equivocal interpretations for isotopic data resulting from this method have occurred quite often in previous studies that apply these isotopic *** order to better elucidate the closure of Sm-Nd in scheelite,the kinetics of Sm and Nd within this mineral lattice were investigated through calculation of diffusion constants presented *** following Arrhenius relations were obtained:D_(Nd)=4.00exp(-438 kJ·mol^(–1)/RT)cm^(2)/s D_(Sm)=1.85exp(-427 kJ·mol^(–1)/RT)cm^(2)/s showing diffusion rate of Nd is near identical to Sm in scheelite when at the same ***,compared to other rare earth elements(REEs),which have markedly different atomic radii to either Nd or Sm,these are shown to exhibit a great variation in *** observed trends in our data are in excellent agreement with the diffusion characteristics of REEs in other tetragonal ABO4 minerals,indicating that ionic radius is a key constraint to the diffusivity of REEs in the various crystal *** this in mind,the same substitution mechanism and a very slight discrepancy in radii will allow us to infer that significant Sm/Nd diffusional fractionation in scheelite is unlikely to occur during most geological *** upon the diffusion data determined herein,Sm and Nd closure temperatures and retention times in scheelite are discussed in terms of diffusion *** results suggest that closure temperatures for Sm-Nd within this mineral are relatively high in contrast to the temperature ranges of ore-formation responsible for scheelite-related deposits,and any later thermal *** is likely,therefore,that rel

关键词： Sm-Nd system diffusion scheelite closure temperature isotopic dating

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