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Geochemical classification of Palaeoproterozoic oceanic volcanic front and backarc basin remnants of the Granites-Tanami Orogen, Australia
Precambrian Research ( IF 3.2 ) Pub Date : 2021-08-27 , DOI: 10.1016/j.precamres.2021.106362
Susanne Schmid 1 , James Davis 2 , Noreen J. Evans 3
Affiliation  

The Granites-Tanami Orogen (GTO) is a lower-greenschist to amphibolite facies succession of >1840 Ma backarc basalts and volcaniclastic-sedimentary rocks that was metamorphosed (~1850–1840 Ma), and later intruded by granites and granodiorites (~1825–1791 Ma) during assembly of the Kimberley Craton, proto-Northern Australia Craton, and the Arunta Region.

The data presented here show geochronological, sedimentological, petrographic, and geochemical evidence for the existence of a volcanic arc (‘Tanami Arc’) in the GTO at ~1912 Ma. Furthermore, the combination of volcanic structures, including fiamme and hyaloclastites, and a mafic HFSE geochemical signature of the pyroclastic and volcaniclastic-sedimentary turbidite successions suggests a syndepositional volcanic front within an oceanic arc-backarc system during deposition of the Dead Bullock Formation (and equivalents). Geochemical vectors applied to existing stratigraphic interpretations indicate a trend towards more felsic composition with younging, providing an alternative proxy for relative stratigraphy and a tool for exploration and correlation across the GTO. The localisation of the volcanic arc within the N-NNE dipping arc-continent collision zone has important implications for the debated Palaeoproterozoic amalgamation of the North Australia Craton.



中文翻译:

澳大利亚塔纳米造山带古元古代海洋火山前缘和弧后盆地遗迹地球化学分类

Granites-Tanami Orogen (GTO) 是由>1840 Ma 弧后玄武岩和火山碎屑-沉积岩变质(~1850-1840 Ma),后来被花岗岩和花岗闪长岩(~1825 1791 Ma) 在金伯利克拉通、原北澳大利亚克拉通和阿伦塔地区组装期间。

此处提供的数据显示了大约 1912 Ma 时 GTO 中存在火山弧(“Tanami Arc”)的年代学、沉积学、岩相学和地球化学证据。此外,火山结构的组合,包括火焰和透明碎屑岩,以及火山碎屑和火山碎屑-沉积浊积岩系列的基性 HFSE 地球化学特征表明,在 Dead Bullock 组(和等效物)沉积期间,大洋弧-弧后系统内存在同沉积火山前沿)。应用于现有地层解释的地球化学矢量表明,随着年轻化,长英质成分呈更多趋势,为相对地层学提供了替代替代品,并为整个 GTO 的勘探和相关性提供了工具。

更新日期:2021-08-29
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