In situ Rb–Sr dating and REE analysis of glauconites and detrital feldspars from the Ediacaran/Cambrian strata: Centralian and Adelaide Superbasins, Australia

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-06-12 DOI:10.1016/j.precamres.2025.107851

Cecilia Loyola , Juraj Farkaš , Alan S. Collins , Sarah E. Gilbert , Charles Verdel , Stefan C. Löhr , Glenn A. Brock , Graham A. Shields , Andre Baldermann , Ahmad Redaa , Morgan Blades , Darwinaji Subarkah , Caleb Bishop , Sarah M. Giles , Nicholas Christie-Blick , Peter W. Haines

{"title":"In situ Rb–Sr dating and REE analysis of glauconites and detrital feldspars from the Ediacaran/Cambrian strata: Centralian and Adelaide Superbasins, Australia","authors":"Cecilia Loyola , Juraj Farkaš , Alan S. Collins , Sarah E. Gilbert , Charles Verdel , Stefan C. Löhr , Glenn A. Brock , Graham A. Shields , Andre Baldermann , Ahmad Redaa , Morgan Blades , Darwinaji Subarkah , Caleb Bishop , Sarah M. Giles , Nicholas Christie-Blick , Peter W. Haines","doi":"10.1016/j.precamres.2025.107851","DOIUrl":null,"url":null,"abstract":"<div><div>Proterozoic sedimentary rocks are challenging to date due to the absence of fossils for biostratigraphic constraints. This study employs in situ Rb–Sr dating of K-rich minerals (glauconite and K-feldspar) to constrain depositional and diagenetic histories within the late Proterozoic–early Paleozoic Centralian and Adelaide Superbasins, Australia. Samples analyzed include the Arumbera Sandstone (Amadeus Basin), Dey Dey Mudstone (Officer Basin), and Wonoka Formation (Flinders Ranges), spanning the Precambrian-Cambrian transition (∼580–520 Ma).</div><div>In situ Rb–Sr dating of glauconite from the above depositional systems yielded ages between 422 ± 11 Ma and 472 ± 5 Ma, thus systematically younger than the expected depositional ages, reflecting diagenetic overprinting during later post-depositional tectonic events, such as the Alice Springs Orogeny (Rodingan Event, ∼440–430 Ma) (<span><span>Scrimgeour, 2013</span></span>), and the Delamerian Orogeny (∼514–480 Ma). Interestingly, a pore-filling K-rich clay material from the Arumbera Sandstone (Amadeus Basin) returned an age of 530 ± 67 Ma, aligning with the expected depositional age.</div><div>Finally, detrital K-feldspar grains from the Arumbera Sandstone provided older Rb–Sr ages (1149–1780 Ma), which are thus consistent with ages or possible source rocks from the Musgrave Province and Kimban Orogen, supported by petrographic analysis as well as distinct REE patterns. These findings demonstrate the utility of combined in situ Rb–Sr dating, petrographic and REE analyses, for investigating diagenetic processes, post-depositional tectonic events, and sediment provenance in the Proterozoic basins. This novel approach offers a direct, rapid, efficient geochronological tool for characterizing complex depositional, diagenetic and alteration/burial histories of glauconite-rich strata with minimal sample preparation.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"427 ","pages":"Article 107851"},"PeriodicalIF":3.2000,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Precambrian Research","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0301926825001779","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Proterozoic sedimentary rocks are challenging to date due to the absence of fossils for biostratigraphic constraints. This study employs in situ Rb–Sr dating of K-rich minerals (glauconite and K-feldspar) to constrain depositional and diagenetic histories within the late Proterozoic–early Paleozoic Centralian and Adelaide Superbasins, Australia. Samples analyzed include the Arumbera Sandstone (Amadeus Basin), Dey Dey Mudstone (Officer Basin), and Wonoka Formation (Flinders Ranges), spanning the Precambrian-Cambrian transition (∼580–520 Ma).

In situ Rb–Sr dating of glauconite from the above depositional systems yielded ages between 422 ± 11 Ma and 472 ± 5 Ma, thus systematically younger than the expected depositional ages, reflecting diagenetic overprinting during later post-depositional tectonic events, such as the Alice Springs Orogeny (Rodingan Event, ∼440–430 Ma) (Scrimgeour, 2013), and the Delamerian Orogeny (∼514–480 Ma). Interestingly, a pore-filling K-rich clay material from the Arumbera Sandstone (Amadeus Basin) returned an age of 530 ± 67 Ma, aligning with the expected depositional age.

Finally, detrital K-feldspar grains from the Arumbera Sandstone provided older Rb–Sr ages (1149–1780 Ma), which are thus consistent with ages or possible source rocks from the Musgrave Province and Kimban Orogen, supported by petrographic analysis as well as distinct REE patterns. These findings demonstrate the utility of combined in situ Rb–Sr dating, petrographic and REE analyses, for investigating diagenetic processes, post-depositional tectonic events, and sediment provenance in the Proterozoic basins. This novel approach offers a direct, rapid, efficient geochronological tool for characterizing complex depositional, diagenetic and alteration/burial histories of glauconite-rich strata with minimal sample preparation.

查看原文本刊更多论文

澳大利亚中部和阿德莱德超级盆地埃迪卡拉系/寒武系地层海绿石和碎屑长石原位Rb-Sr定年及稀土元素分析

元古代沉积岩由于缺乏生物地层限制的化石，迄今为止具有挑战性。本研究采用原位Rb-Sr定年法对富钾矿物（海绿石和钾长石）进行测年，以限制澳大利亚晚元古代-早古生代中第三纪和阿德莱德超级盆地的沉积和成岩历史。分析的样品包括Arumbera砂岩（Amadeus盆地），Dey Dey泥岩（Officer盆地）和Wonoka组（Flinders山脉），跨越前寒武纪-寒武纪过渡（~ 580-520 Ma）。上述沉积体系海绿石的原位Rb-Sr测年结果显示，海绿石的年龄在422±11 Ma至472±5 Ma之间，比预期的沉积年龄更年轻，反映了后期沉积后构造事件（如Alice Springs造山运动（Rodingan事件，~ 440-430 Ma）（Scrimgeour, 2013）和Delamerian造山运动（~ 514-480 Ma））的成岩叠加作用。有趣的是，来自Arumbera砂岩（Amadeus盆地）的富钾填孔粘土物质返回的年龄为530±67 Ma，与预期的沉积年龄一致。Arumbera砂岩碎屑钾长石颗粒提供了更古老的Rb-Sr年龄（1149 ~ 1780 Ma），因此，岩石学分析和明显的REE模式支持了与Musgrave省和Kimban造山带可能的烃源岩年龄一致。这些发现证明了原位Rb-Sr测年、岩石学和稀土元素分析在研究元古代盆地的成岩过程、沉积后构造事件和沉积物物源方面的实用性。这种新方法提供了一种直接、快速、有效的年代学工具，可以用最少的样品制备来表征富海绿石地层的复杂沉积、成岩和蚀变/埋藏历史。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.