Geochemistry of Neoproterozoic shales from the Kalius Member: Assessing the sedimentary provenance and paleo-weathering

Francovschi Ion; Grădinaru Eugen; Roban Relu; Ciobotaru Valerian

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FRANCOVSCHI, Ion, GRĂDINARU, Eugen, ROBAN, Relu, CIOBOTARU, Valerian. Geochemistry of Neoproterozoic shales from the Kalius Member: Assessing the sedimentary provenance and paleo-weathering. In: Buletinul Institutului de Geologie şi Seismologie al AŞM, 2014, nr. 2, pp. 14-23. ISSN 1857-0046.

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Buletinul Institutului de Geologie şi Seismologie al AŞM

Numărul 2 / 2014 / ISSN 1857-0046

Geochemistry of Neoproterozoic shales from the Kalius Member: Assessing the sedimentary provenance and paleo-weathering

CZU: 550.4

Pag. 14-23

Francovschi Ion¹, Grădinaru Eugen¹, Roban Relu¹, Ciobotaru Valerian²

¹ University of Bucharest,
² Institute of Geology and Seismology, ASM

Disponibil în IBN: 28 mai 2015

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The major and trace element chemical composition of Neoproterozoic shales from the Kalius Member, Nagoriany Formation has been investigated to determine the source-area rock composition and paleo-weathering conditions during the Late Proterozoic. The different bivariate plots suggest their derivation from predominantly felsic source-area rocks and partially from basic source-area rocks. The paleo-weathering data indicate that during the sedimentation of the Kalius shales the source-area rocks were moderately weathered.

Compoziţia chimică a elementelor majore şi urmă din argilitele neoproterozoice din Membrul de Kalius, Formaţiunea Nagoriansk a fost determinată cu scopul de a obţine informaţii privind compoziţia rocilor din aria sursă a sedimentelor şi condiţiile de alterare subaeriană în timpul Proterozoicului târziu. Diferitele diagrame bivariate indică provenienţa ace stora dintr-o arie sursă predominant felsică şi parţial bazică. Datele privind condiţiile de paleo-eroziune indică faptul că în timpul sedimentării argilitelor de Kalius rocile din aria sursă au fost supuse unor procese moderate de alterare subaeriană.

Содержание главных химических элементов, а также микроэлементов в Калюсских аргиллитах Нагорянской свиты неопротерозоя, было определено с целью получения информации относительно состава горных пород в пределах области осадконакопления и условиях эрозионных процессов, происходящих в позднем протерозое. Различные диаграммы двухкомпонентных величин указывают на происхождение данных пород в области распространения преимущественно кислого и, частично – основного состава. Данные относительно условий палеоэрозии указывают на то, что в процессе формирования калюсских аргиллитов, горные породы из области сноса были уже подвержены частичной эрозии.

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