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Single zircon LA-ICPMS U-Pb dating of Weishan granite (Hunan, South china) and its petrogenetic significance

science{1. {2. sciences 2006年第8期49卷 816-827页

作者： ding xing1,{1.,{2., huang hongye2.& zhou xinmin1 1. department of earth science, nanjing university, nanjing 2.1}093, china 2. Research Institute No.2.0, CNNC, Changsha 41.01., china 1. department of {1. {2. Nanjing University Nanjing 210093 China 2. Research Institute No.2.0 CNNC Changsha 410011 China

A detailed microstructure analysis and LA-ICPMS U-Pb dating have been done for zir- cons of Weishan granite from Hunan Province, South china. The results indicate that the Weishan granite is a multistage batholith formed during the late Indosinian-early Yanshanian time. The intruded time of the late Indosinian granite is 2.1}.0±1.6Ma and 2.1}.7±1.9Ma (two samples), whereas that of the early Yanshanian granite is 1.7.4±3.5Ma and 1.4.5±5.1.a (two samples). In combination with other geochronological data for Indosinian rocks of South china and the adjacent region, it is inferred that the late Indosinian granites of South china (especially Hunan Province) are probably formed under extension regime as a consequence of post-collision stress relaxation, which is a spontaneous response to intracontinental thickening attributed to the collision and extrusion of two Indosinian seams, namely Qinling-Dabie and Song Ma. Moreover, it is also deduced that the early Yanshanian granites of Hunan Province could not be directly related with the subduction of Paleo-Pacific plate towards Eurasian continent, and they are most likely derivation of the mid- or lower-crustal materials because of decompressional melting under the continuous extension setting.

关键词： CL images, LA-ICPMS U-Pb dating, granite, Weishan, Hunan.

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Single Zircon LA-ICP-MS U-Pb Dating of the Guandimiao and Wawutang Granitic Plutons in Hunan,South china and Its Petrogenetic Significance

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Acta Geologica Sinica(English Edition) 2007年第1期81卷 81-89页

作者： chen {1. chen peirong zhou xinmin huang hongye ding xing SUN Tao The Key Laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing Jiangsu 210093 No. 2.0 Research Institute CNNC Changsha Hunan 410011

The Guandimao and Wawutang plutons are located at the center of Hunan, South china. The former is mainly composed of biotite monzonitic granites/granodiorites and two-mica monzonltic granites, but the latter only consists of biotite monzonitic granites. The zircon ages of 2.3.0±1.6 Ma （biotite monzonitic granites） and 2.8.0-2..2.Ma （two-mica monzonltic granites） for the Guandimao pluton and 2.4±3 Ma for the Wawutang pluton obtained with the LA-ICP-MS U-Pb dating indicate that they were formed during the late Indosinian. In consideration of other geochronological data from Indosinian rocks of South china and adjacent regions, it is inferred that the two plutons were derived from crustal materials by decompressional melting in a post-collisional tectonic setting during spontaneous thinning of the thickened curst. Moreover, the inherited zircon age of 1.73±57 Ma from the Wawutang pluton indicates that the source of the two plutons is related to the early Proterozoic crustal basement.

关键词： zircon LA-ICP-MS U-Pb dating granite Indosinian movement CL images

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湖南阳明山岩体的La-ICP-MS锆石U-Pb定年及成因研究

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地质学报 2006年第7期80卷 1065-1077页

作者：陈卫锋陈培荣周新民黄宏业丁兴孙涛南京大学地球科学系核工业2.0研究所长沙410011

湖南阳明山岩体主要由二云母二长花岗岩和电气石白云母花岗岩构成,两类花岗岩的锆石La-ICP-MS定年结果分别为2.0}.0±1..0Ma和2.0}.9±3.4Ma,属印支晚期花岗岩。该岩体具有富SiO2.74.33%~76.03%)、Al2.3(1..34%~1..47%)和P2.5(0.2.0}~0.34%),高A/CNK(=1.1.~1.32.的特征,为强过铝花岗岩。微量元素中富集Rb、Th、U、Pb、Ta、Ce、Sm、Y,明显亏损Ba、Sr、Nb、Ti、Eu,稀土总量低(ΣREE=1..49~90.43μg/g),轻稀土富集(LREE/HREE=6.43~1..64,LaN/YbN=5.2.~1..94),中稀土轻度富集(GdN/YbN=1.76~2.2.),具显著的负Eu异常(δEu=0.07~0.2.)。岩体具高86Sr/87Sri(0.773980~0.742.0}8)和低εNd(t)(-1..3^-1..1.的同位素特征,Nd模式年龄(1.31.1.92.a)及残留锆石年龄(581.2.92.a),都指示阳明山花岗岩为典型的壳源型花岗岩,是在地壳伸展—减薄的构造背景下,古元古代变泥质岩减压熔融的产物。此外,获得多组继承/捕虏锆石年龄值(581.2.92.a),为本区存在早前寒武纪变质结晶基底及华南陆壳具多阶段生长演化特征提供了佐证。

关键词： La—ICP—MS锆石U—Pb定年过铝质花岗岩印支运动华南

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