New results of stable isotope and petrographic studies of Jurassic glendonites from Siberia
We present the results of an optical microscopy, cathodoluminoscopy and isotopic study on nine glendonite concretions (calcite pseudomorphs replacing metastable hexahydrate ikaite) from Lower- Middle Jurassic sediments of Northeast Russia (Anabar Bay and Lena River region). Glendonite concretions ar...
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ftstpetersburgun:oai:dspace.spbu.ru:11701/19302 2023-05-15T13:24:30+02:00 New results of stable isotope and petrographic studies of Jurassic glendonites from Siberia Ершова, Виктория Бэртовна 2019 http://hdl.handle.net/11701/19302 en eng Taylor & Francis http://hdl.handle.net/11701/19302 Article 2019 ftstpetersburgun 2020-09-14T23:50:15Z We present the results of an optical microscopy, cathodoluminoscopy and isotopic study on nine glendonite concretions (calcite pseudomorphs replacing metastable hexahydrate ikaite) from Lower- Middle Jurassic sediments of Northeast Russia (Anabar Bay and Lena River region). Glendonite concretions are mainly found within Late Pliensbachian, Toarcian, Aalenian, Bajocian and Lower Bathonian clastic sediments, correlating to episodes of global climatic cooling as determined by independent paleoclimate proxy data. Stable carbon and oxygen isotopic values of glendonite concretions suggest that the primary source of carbon was derived from diagenetically altered organic matter, and the source of oxygen was from seawater. The secondary diagenetic cement is characterized by a significantly lighter δ18O and significantly heavier δ13C signature than the isotopic characteristics of the bulk rock glendonite concretion. This secondary diagenetic cement is thought to have precipitated rapidly during burial diagenesis and since it occupies a significant volume of the glendonite concretion, it has the potential to significantly influence the isotopic composition of bulk rock glendonites. Article in Journal/Newspaper Anabar Bay lena river Siberia Saint Petersburg State University: Research Repository (DSpace SPbU) Anabar ENVELOPE(113.624,113.624,73.286,73.286) |
institution |
Open Polar |
collection |
Saint Petersburg State University: Research Repository (DSpace SPbU) |
op_collection_id |
ftstpetersburgun |
language |
English |
description |
We present the results of an optical microscopy, cathodoluminoscopy and isotopic study on nine glendonite concretions (calcite pseudomorphs replacing metastable hexahydrate ikaite) from Lower- Middle Jurassic sediments of Northeast Russia (Anabar Bay and Lena River region). Glendonite concretions are mainly found within Late Pliensbachian, Toarcian, Aalenian, Bajocian and Lower Bathonian clastic sediments, correlating to episodes of global climatic cooling as determined by independent paleoclimate proxy data. Stable carbon and oxygen isotopic values of glendonite concretions suggest that the primary source of carbon was derived from diagenetically altered organic matter, and the source of oxygen was from seawater. The secondary diagenetic cement is characterized by a significantly lighter δ18O and significantly heavier δ13C signature than the isotopic characteristics of the bulk rock glendonite concretion. This secondary diagenetic cement is thought to have precipitated rapidly during burial diagenesis and since it occupies a significant volume of the glendonite concretion, it has the potential to significantly influence the isotopic composition of bulk rock glendonites. |
format |
Article in Journal/Newspaper |
author |
Ершова, Виктория Бэртовна |
spellingShingle |
Ершова, Виктория Бэртовна New results of stable isotope and petrographic studies of Jurassic glendonites from Siberia |
author_facet |
Ершова, Виктория Бэртовна |
author_sort |
Ершова, Виктория Бэртовна |
title |
New results of stable isotope and petrographic studies of Jurassic glendonites from Siberia |
title_short |
New results of stable isotope and petrographic studies of Jurassic glendonites from Siberia |
title_full |
New results of stable isotope and petrographic studies of Jurassic glendonites from Siberia |
title_fullStr |
New results of stable isotope and petrographic studies of Jurassic glendonites from Siberia |
title_full_unstemmed |
New results of stable isotope and petrographic studies of Jurassic glendonites from Siberia |
title_sort |
new results of stable isotope and petrographic studies of jurassic glendonites from siberia |
publisher |
Taylor & Francis |
publishDate |
2019 |
url |
http://hdl.handle.net/11701/19302 |
long_lat |
ENVELOPE(113.624,113.624,73.286,73.286) |
geographic |
Anabar |
geographic_facet |
Anabar |
genre |
Anabar Bay lena river Siberia |
genre_facet |
Anabar Bay lena river Siberia |
op_relation |
http://hdl.handle.net/11701/19302 |
_version_ |
1766380004511318016 |