Provenance and tectonic setting of the Early Permian sedimentary succession in the southern edge of the Sydney Basin, eastern Australia,Geological Journal

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Provenance and tectonic setting of the Early Permian sedimentary succession in the southern edge of the Sydney Basin, eastern Australia
Geological Journal ( IF 1.4 ) Pub Date : 2020-12-06 , DOI: 10.1002/gj.4051
Angelos G. Maravelis ₁ , Robin Offler ₂ , George Pantopoulos ₃ , William J. Collins ₄

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Early Permian basins formed during a major phase of crustal extension are common throughout eastern Gondwana. One of these basins, the Sydney Basin, has not been subjected to geochemical studies aimed at determining the sedimentary provenance and the tectonic setting. This study provides new geochemical data of the Lower Permian siliciclastic successions in the southern edge of the Sydney Basin. Published petrographic analysis indicates a source area containing sedimentary, felsic volcanic, plutonic, and low‐grade metamorphic rocks. Major, trace and rare earth element data suggest that the clastic rocks are geochemically mature and originated from a continental source that has been subjected to moderate to strong weathering. Further, they indicate that most source rocks were of felsic composition and that only the oldest sediments possess a more mafic signature. The provenance data presented in this study, along with published palaeocurrent data, point to the Lachlan orogen being the main source of sediments for the basin. Multi‐dimensional discrimination diagrams suggest a continental rift setting and agree with the published sequence stratigraphic framework that suggests a deepening‐upward depositional trend associated with tectonic subsidence. This study documents geochemically the provenance of the sedimentary successions within the southern edge of the Sydney Basin and the continental rift origin of the basin.

中文翻译：

澳大利亚东部悉尼盆地南缘的早二叠世沉积演替的物源和构造环境

在地壳伸展的主要阶段形成的早期二叠纪盆地在整个冈瓦纳东部都很常见。这些盆地之一，悉尼盆地，尚未进行过旨在确定沉积物源和构造环境的地球化学研究。这项研究为悉尼盆地南缘的下二叠统硅质碎屑演替提供了新的地球化学数据。已发表的岩相学分析表明源区包含沉积，长英质火山岩，深成岩和低品位变质岩。主要，痕量和稀土元素数据表明，碎屑岩在地球化学上已经成熟，并且起源于经历了中度到强烈风化作用的大陆来源。进一步，他们表明大多数烃源岩具有长英质成分，只有最古老的沉积物才具有镁铁质特征。这项研究中提供的物源数据以及已发布的古流变数据指出，拉克兰造山带是该盆地沉积物的主要来源。多维判别图表明了大陆裂谷的环境，并与已公布的层序地层学框架相一致，后者表明了与构造沉降有关的深部向上沉积趋势。这项研究从地球化学角度记录了悉尼盆地南缘和盆地大陆裂谷起源的沉积演替的起源。指出拉克兰造山带是盆地沉积物的主要来源。多维判别图表明了大陆裂谷的环境，并与已公布的层序地层学框架相一致，后者表明了与构造沉降有关的深部向上沉积趋势。这项研究从地球化学角度记录了悉尼盆地南缘和盆地大陆裂谷起源的沉积演替的起源。指出拉克兰造山带是盆地沉积物的主要来源。多维判别图表明了大陆裂谷的环境，并与已公布的层序地层学框架相一致，后者表明了与构造沉降有关的深部向上沉积趋势。这项研究从地球化学角度记录了悉尼盆地南缘和盆地大陆裂谷起源的沉积演替的起源。

更新日期：2020-12-06

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