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首页> 外文期刊>The journal of earth and planetary sciences, Nagoya University >CHIME dating of monazite from the Dongqing pluton in SE Jilin, China
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CHIME dating of monazite from the Dongqing pluton in SE Jilin, China

机译：中国东南部吉林省东庆岩体独居石的CHIME年代测定

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The Dongqing pluton in the Zhangguangcai Range, NE China comprises two-mica monzogranite and garnet-bearing two-mica monzogranite with subordinate garnet-bearing muscovite alkali-feldspar granite. The monzogranite was dated as 208 Ma by the 208Pb/232Th monazite dating (Fang, 1992) and ca. 160 Ma by the Rb-Sr and Sm-Nd methods (Wu et al., 2004). To examine the discrepancy, monazite from the monzogranite was dated by the CHIME method coupled with age mapping. Monazite grains show significant compositional variation in concentric and sector fashions, but are chronologically uniform. Individual sets of ThO2, UO2 and PbO analyses were screened by the chemical criteria, 0.96<(Ca+Si)/(Th+U+Pb+S)<1.05 and K2O<0.02 wt.%. The screened data points are arrayed linearly on the PbO vs. ThO2* diagram and define an isochron of 159.0±4.8 Ma with an intercept value of 0.0030±0.0017, suggesting that the older isotopic monazite age is possibly resulted from the sizable amounts of initial Pb. Present CHIME monazite dating reinforces that variety of peraluminous rocks in the Dongqing pluton formed at about 160 Ma through the late stage of magmatic differentiation and magma-fluid interaction.
机译：中国东北张光彩山脉的东庆岩体由两云母辉石花岗岩和石榴石二云母辉石组成，其下还有石榴石白云母碱性长石花岗岩。 208Pb / 232Th独居石约会（Fang，1992）和ca.用Rb-Sr和Sm-Nd方法测定160 Ma（Wu等，2004）。为了检查差异，通过CHIME方法结合年龄映射对来自独居花岗岩的独居石进行了测年。独居石晶粒以同心和扇形方式显示出明显的成分变化，但在时间上是均匀的。通过化学标准0.96 <（Ca + Si）/（Th + U + Pb + S）<1.05和K2O <0.02 wt。％筛选ThO2，UO2和PbO分析的各个组。筛选出的数据点在PbO与ThO2 *图表上线性排列，并定义了159.0±4.8 Ma的等时线，截距值为0.0030±0.0017，这表明较旧的同位素独居石年龄可能是由于大量初始Pb引起的。目前的CHIME独居石测年表明，在岩浆分化和岩浆-流体相互作用的后期，东庆岩体中的各种铝质岩形成于约160 Ma。

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    DeyouSuN; Kazuhiro Suzuki; Izumi Kajizuka; Hiroshi Kamikubo; Xiaoping Lu; Fuyuan Wu;

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    College of Earth Sciences, Jilin University,Changchun 130061, China;

    The Center for Chronological Research, Nagoya University,Nagoya 464-8602, Japan,;

    The Center for Chronological Research, Nagoya University,Nagoya 464-8602, Japan,;

    The Center for Chronological Research, Nagoya University,Nagoya 464-8602, Japan Graduate School of Environmental Sciences, Nagoya University,Nagoya 464-8602, Japan;

    Institute of Regional Geological Survey of Jilin Province,Changchun 130022, China;

    Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029, China;

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