加拿大新不伦瑞克省北部南内皮西特河深部岩浆岩套中同成碱性拉图尔山和过铝质伊丽莎白山花岗岩的精确U-Pb年龄

IF 1.2 4区地球科学 Q2 GEOLOGY

Atlantic Geology Pub Date : 2016-10-24 DOI:10.4138/ATLGEOL.2016.009

Z. Azadbakht, C. McFarlane, D. Lentz

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引用次数: 11

摘要

南内皮西特河深成岩套件由新不伦瑞克省北部早泥盆世多期长英质至基性深成岩组成。该侵入套件的长英质部分包括一大块均质、过铝黑云母花岗岩(伊丽莎白山花岗岩)，其西侧两侧是碱性拉图尔山花岗岩。激光烧蚀-电感耦合等离子体质谱-m法分析了该组两侧的独居石和锆石晶粒，确定了伊丽莎白山花岗岩的结晶年龄为417.3±0.96 Ma，拉图尔山花岗岩的结晶年龄为417.7±4.4 Ma。新的数据证实了以前的地质年代学工作，并表明该深成岩套的这些长英质阶段之间存在密切的时间关系。

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Precise U-Pb ages for the cogenetic alkaline Mount LaTour and peraluminous Mount Elizabeth granites of the South Nepisiguit River Plutonic Suite, northern New Brunswick, Canada

The South Nepisiguit River Plutonic Suite consists of various phases of felsic to mafic plutonic rocks of early Devonian age in northern New Brunswick. The felsic portion of this intrusive suite includes a large pluton of homogeneous, peraluminous biotite granite (the Mount Elizabeth Granite), which is flanked on its western side by the alkaline Mount LaTour Granite. New in situ and mineral separate U-Pb Laser Ablation-Inductively Coupled Plasma Mass Spectro -m etry analyses of monazite and zircon grains from both sides of the suite define a crystallization age of 417.3 ± 0.96 Ma for the Mount Elizabeth Granite and 417.7 ± 4.4 Ma for the Mount LaTour Granite. The new data confirm previous geochronological work and indicate a close temporal relationship between these felsic phases of this plutonic suite.

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来源期刊

Atlantic Geology GEOLOGY-

CiteScore

2.10

自引率

18.80%

发文量

审稿时长

>12 weeks

期刊介绍： Atlantic Geology (originally Maritime Sediments, subsequently Maritime Sediments and Atlantic Geology) covers all aspects of the geology of the North Atlantic region. It publishes papers, notes, and discussions on original research and review papers, where appropriate to the regional geology.