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A ca. 2.2Ga Acidic Magmatic Event at the Northern Margin of the Yangtze Craton: Evidence from U-Pb Dating and Hf Isotope Analysis of Zircons from the Kongling Complex 被引量:2
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作者 XU Daliang WEI Yunxu +3 位作者 PENG Lianhong DENG Xin HU Kun LIU Hao 《Acta Geologica Sinica(English Edition)》 CAS CSCD 2018年第2期872-873,共2页
Objective The Yangtze craton collisional orogeny at ca. extensional events at ca. 1 experienced Paleoproterozoic 1.95-2.0 Ga and post-orogenic 85 Ga related to amalgamation of the Columbia (Nuna) supercontinent (Zh... Objective The Yangtze craton collisional orogeny at ca. extensional events at ca. 1 experienced Paleoproterozoic 1.95-2.0 Ga and post-orogenic 85 Ga related to amalgamation of the Columbia (Nuna) supercontinent (Zhao and Cawood, 2012). A ca. 2.15 Ga suprasubduction zone ophiolitic melange was recongized in the Archean- Paleoproterozoic Kongling Complex of the northern Yangtze craton (Han et al., 2017). However, the tectonic evolution in early Paleoproterozoic from 2.4 Ga to 2.2 Ga remains unclear. We report here the presence of a suite of Paleoproterozoic (2.2 Ga) granites in the Huangling dome, northern Yangtze craton, which may provide important insights into crustal growth processes in the craton prior to the assembly of Columbia. 展开更多
关键词 Pb hf Acidic Magmatic Event at the Northern Margin of the Yangtze Craton Evidence from U-Pb Dating and hf Isotope analysis of Zircons from the Kongling Complex Ga
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A new analytical mode and application of the laser ablation inductively coupled plasma mass spectrometer in the earth sciences 被引量:3
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作者 Yantong FENG Wen ZHANG +5 位作者 Zhaochu HU Yongsheng LIU Tao LUO Tao HE Hong LIU Kun YU 《Science China Earth Sciences》 SCIE EI CSCD 2022年第1期182-196,共15页
We proposed a new laser analytical mode,which used the high-frequency laser ablation to deliberately obtain the peak-shape signal profile,combined with the linear regression calibration(LRC)method to calculate element... We proposed a new laser analytical mode,which used the high-frequency laser ablation to deliberately obtain the peak-shape signal profile,combined with the linear regression calibration(LRC)method to calculate elemental or isotopic ratios.In order to assess the performance of the new laser analytical mode for the application in the field of earth science,we systematically investigated the elemental quantitative analysis with high spatial resolution(10μm),rapid U-Pb dating in zircons and accurate Sr-Hf isotope analysis in geological samples.The new high-frequency laser analysis technology(20 Hz,100 pulses)reduced the limit of detection(LOD)of 25 elements to 0.005-0.16μg g^(-1) with crater diameters of 10μm,which are significantly lower(decrease to 2-20%)than previous researches.The quantitative analysis of five silicate glass reference materials showed that the precision and accuracy of the 25 trace elements(with the concentration ranging from 0.17 to 683μg g^(-1))were better than 16% and 15%,respectively.The new methods raised the analytical throughput of zircon U-Pb dating,Sr isotope ratios and Hf isotope ratios to 250 analyses per hour,144 analyses per hour and 120 analyses per hour in theory,while the analytical accuracy and precision were not affected.The detailed investigations showed that the proposed new laser analytical mode has good application effects in the field of earth sciences. 展开更多
关键词 LA-ICP-MS New laser analytical mode Trace-element analysis Rapid U-Pb dating Sr and hf isotope analysis
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