伊拉克东北部中至上侏罗统sargelu、naokelekan和barsarin地层的矿物学和地球化学:对古环境、物源和构造背景的指示意义

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Rebwar H. Rasool , Sarmad A. Ali , Ali I. Al-Juboury , Nasir Alarifi , Fadhil A. Lawa , Harry Rowe , Giovanni Zanoni , David L. Dettman
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引用次数: 0

摘要

研究了伊拉克东北部Sargelu地区中上侏罗统Sargelu、Naokelekan和Barsarin组的矿物学和地球化学特征。该研究旨在利用x射线衍射、x射线荧光以及碳和氧的稳定同位素来解释形成这些地层的物源、构造环境、古气候和古风化过程。这些发现为了解该地区侏罗纪时期的地质历史和环境条件提供了有价值的见解。XRD分析表明,页岩样品中的粘土矿物主要由伊利石、高岭石和混合层伊利石—蒙脱石组成。主要元素和微量元素地球化学分析、黏土矿物学和稳定的氧碳同位素数据表明,侏罗纪地层沉积时期主要处于干旱至半干旱半湿润的气候条件。研究结果表明,Sargelu、Naokelekan和Barsarin组的页岩均为长英质火成岩源,并与SiO2 / log (K2O/Na2O)二元曲线相比较。氧、碳同位素变化及微量元素数据表明,Sargelu组沉积于咸海环境,Naokelekan组沉积于咸海-淡水环境,Barsarin组沉积于高咸水-半咸水-淡水环境。古氧化还原和古生产力指标显示沉积条件为缺氧-亚缺氧,其中直克列坎组的生产力特别高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mineralogy and geochemistry of the middle to upper jurassic sargelu, naokelekan, and barsarin formations from northeastern Iraq: Implications for paleoenvironmental, provenance, and tectonic setting proxies
This study investigates the mineralogical and geochemical characteristics of the middle-upper Jurassic Sargelu, Naokelekan, and Barsarin formations in the Sargelu area, northeastern Iraq. The study aims to interpret the provenance, tectonic setting, paleoclimate, and paleoweathering processes that shaped these formations using X-ray diffraction, X-ray fluorescence, and stable isotopes of carbon and oxygen. The findings provided valuable insights into the geological history and environmental conditions of the region during the Jurassic period. XRD analysis revealed that the clay minerals in the shale samples primarily consist of illite, kaolinite, and mixed-layer illite-smectite. Geochemical analysis of major and trace elements, along with clay mineralogy and stable oxygen and carbon isotopic data, indicate that arid to semi-arid and semi-humid climatic conditions prevailed during the deposition of the Jurassic formations. The shales from the Sargelu, Naokelekan, and Barsarin formations were derived from a felsic igneous source, as evidenced by multiple multidimensional diagram plots and a bivariate plot of SiO2 vs log (K2O/Na2O). Variations in oxygen and carbon isotopes, along with trace element data, suggested that the Sargelu Formation was deposited in a saline marine environment, the Naokelekan Formation in a saline marine to freshwater environment, and the Barsarin Formation in a highly saline, brackish-to-freshwater environment. Paleoredox and paleoproductivity proxies indicated deposition under anoxic to suboxic conditions, with particularly high productivity observed in the Naokelekan Formation.
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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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