%0 Journal Article
%T Micro-sample Rb-Sr analysis using the microsampling technique and its applications on geochronology and petrogenesis<br>微区-微量样品Rb-Sr同位素分析技术及其应用前景
%A Zhu XY
%A Chen FK
%A Yang YZ
%A Hu R
%A <br>祝禧艳
%A 陈福坤
%A 杨一增
%A 胡蓉
%J 岩石学报
%D 2010
%I 
%X This study presents analytical data of Rb-Sr isotopic composition of K-feldspar megacrysts from the Mesozoic Heyu granite pluton exposed in the eastern Qinling orogenic belt, by using the micro-drilling technique and the micro-sample Rb-Sr isotopic analytical method. Analytical results show significant variations in Rb/Sr ratio and Sr isotopic composition within a single K-feldspar crystal. Rb-Sr isochron ages of about 132 Ma to 133 Ma can be obtained from both megacryst and matrix K-feldspars. No significant variations of 87Sr/86Sr initial ratio can be detected in the centre and marginal parts of K-feldspar crystals, suggesting homogeneous Sr isotopic composition during the crystallization of the magma and implying primary origin for the K-feldspar megacrysts of the Heyu granite. Owing the feature of high spatial resolution, a combination of the micro-drilling technique and the micro-sample Rb-Sr isotopic analytical method increases the applications in studies on isotopic geochronology and petrogenesis of metamorphic and plutonic rocks as well as volcanic rocks.
%K Micro-sampling
%K Rb-Sr isotope
%K K-feldspar
%K Granite
%K Qinling orogenic belt<br>微区取样
%K Rb-Sr同位素
%K 钾长石
%K 花岗岩
%K 秦岭造山带
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=F2045F72F3C749F973B05DD087DBAB13&yid=140ECF96957D60B2&vid=96C778EE049EE47D&iid=CA4FD0336C81A37A&sid=86C0C9A759FDA8CA&eid=2E01F39B6CBD53DE&journal_id=1000-0569&journal_name=岩石学报&referenced_num=0&reference_num=47