Paleothermal indicators based on clay mineral and organic matter analyses, were integrated withmudrock geochemistry and stratigraphic data to define the sedimentary evolution of the southwesternThrace Basin during the Eocene to Oligocene. This multi-method approach allowed us to reconstructthe burial evolution of the basin in Eocene and Oligocene times and to study the mudrockcomposition and relate this to their provenance and source area weathering. The studied mudrocksshow similar chemical variations. The distribution of some major and trace elements for the studiedsamples reflect heterogeneous source areas containing both felsic to mafic rocks. In particular, theLight Rare Earth Elements/Transition elements (LREEs/TEs) ratios are very high for the Avdiraand Organi samples (on the average between 1.5 and 2.2 for (La + Ce)/Cr and 3.5–8 for (La + Ce)/Ni), suggesting a felsic source(s), and very low for the Samothraki, Limnos, Paterma and Iasmossamples (on the average between 0.4 and 0.6 for (La + Ce)/Cr and 0.6–1 for (La + Ce)/Ni), suggestinga mainly basic source(s). The mineralogical composition coupled with the A-CN-K and AN-K plots suggest a complex evolution. The clay mineral data (illite percentage in I/S and the stackingorder R and the K€ubler Index) coupled to vitrinite reflectance analysis indicate a high to intermediatediagenetic grade for the Middle to Upper Eocene samples (from Iasmos, Gratini, Organi,Paterma, Esimi and Samotraki sections) and a low diagenetic grade for the Upper Eocene to Oligocenesamples (from Limnos and Avdira sections). These data helped in interpreting the geodynamicevolution of the studied basins where the magmatic activity plays an important role. In particular,Middle to Upper Eocene sediments show high to intermediate diagenetic grade since they arelocated in a portion of the basin dominated by Eocene to Oligocene magmatic activity and intrusionof granitoids, whereas, the Upper Eocene to Oligocene sediments are not involved in important magmaticactivity and intrusion of granitoids and, thus, show low diagenetic grade. Furthermore, Middleto Upper Eocene sediments experienced deeper burial processes caused by lithostatic load,rather than the uppermost Eocene and Oligocene sediments, in relation of their position along thestratigraphic succession. These data suggest a burial depth of at least 3–4 km with a tectonic exhumationmainly related to the extensional phases of the Miocene age.
Paleothermal indicators based on clay mineral and organic matter analyses, were integrated withmudrock geochemistry and stratigraphic data to define the sedimentary evolution of the southwesternThrace Basin during the Eocene to Oligocene. This multi-method approach allowed us to reconstructthe burial evolution of the basin in Eocene and Oligocene times and to study the mudrockcomposition and relate this to their provenance and source area weathering. The studied mudrocksshow similar chemical variations. The distribution of some major and trace elements for the studiedsamples reflect heterogeneous source areas containing both felsic to mafic rocks. In particular, theLight Rare Earth Elements/Transition elements (LREEs/TEs) ratios are very high for the Avdiraand Organi samples (on the average between 1.5 and 2.2 for (La + Ce)/Cr and 3.5–8 for (La + Ce)/Ni), suggesting a felsic source(s), and very low for the Samothraki, Limnos, Paterma and Iasmossamples (on the average between 0.4 and 0.6 for (La + Ce)/Cr and 0.6–1 for (La + Ce)/Ni), suggestinga mainly basic source(s). The mineralogical composition coupled with the A-CN-K and AN-Kplots suggest a complex evolution. The clay mineral data (illite percentage in I/S and the stackingorder R and the Kubler Index) coupled to vitrinite reflectance analysis indicate a high to interme- €diate diagenetic grade for the Middle to Upper Eocene samples (from Iasmos, Gratini, Organi,Paterma, Esimi and Samotraki sections) and a low diagenetic grade for the Upper Eocene to Oligocenesamples (from Limnos and Avdira sections). These data helped in interpreting the geodynamicevolution of the studied basins where the magmatic activity plays an important role. In particular,Middle to Upper Eocene sediments show high to intermediate diagenetic grade since they arelocated in a portion of the basin dominated by Eocene to Oligocene magmatic activity and intrusionof granitoids, whereas, the Upper Eocene to Oligocene sediments are not involved in important magmaticactivity and intrusion of granitoids and, thus, show low diagenetic grade. Furthermore, Middleto Upper Eocene sediments experienced deeper burial processes caused by lithostatic load,rather than the uppermost Eocene and Oligocene sediments, in relation of their position along thestratigraphic succession. These data suggest a burial depth of at least 3–4 km with a tectonic exhumationmainly related to the extensional phases of the Miocene age.
Sedimentary and thermal evolution of the Eocene-Oligocene mudrocks from the southwestern Thrace Basin (NE Greece)
Perri F;CRITELLI, Salvatore;MUTO, Francesco;DOMINICI, Rocco
2016-01-01
Abstract
Paleothermal indicators based on clay mineral and organic matter analyses, were integrated withmudrock geochemistry and stratigraphic data to define the sedimentary evolution of the southwesternThrace Basin during the Eocene to Oligocene. This multi-method approach allowed us to reconstructthe burial evolution of the basin in Eocene and Oligocene times and to study the mudrockcomposition and relate this to their provenance and source area weathering. The studied mudrocksshow similar chemical variations. The distribution of some major and trace elements for the studiedsamples reflect heterogeneous source areas containing both felsic to mafic rocks. In particular, theLight Rare Earth Elements/Transition elements (LREEs/TEs) ratios are very high for the Avdiraand Organi samples (on the average between 1.5 and 2.2 for (La + Ce)/Cr and 3.5–8 for (La + Ce)/Ni), suggesting a felsic source(s), and very low for the Samothraki, Limnos, Paterma and Iasmossamples (on the average between 0.4 and 0.6 for (La + Ce)/Cr and 0.6–1 for (La + Ce)/Ni), suggestinga mainly basic source(s). The mineralogical composition coupled with the A-CN-K and AN-K plots suggest a complex evolution. The clay mineral data (illite percentage in I/S and the stackingorder R and the K€ubler Index) coupled to vitrinite reflectance analysis indicate a high to intermediatediagenetic grade for the Middle to Upper Eocene samples (from Iasmos, Gratini, Organi,Paterma, Esimi and Samotraki sections) and a low diagenetic grade for the Upper Eocene to Oligocenesamples (from Limnos and Avdira sections). These data helped in interpreting the geodynamicevolution of the studied basins where the magmatic activity plays an important role. In particular,Middle to Upper Eocene sediments show high to intermediate diagenetic grade since they arelocated in a portion of the basin dominated by Eocene to Oligocene magmatic activity and intrusionof granitoids, whereas, the Upper Eocene to Oligocene sediments are not involved in important magmaticactivity and intrusion of granitoids and, thus, show low diagenetic grade. Furthermore, Middleto Upper Eocene sediments experienced deeper burial processes caused by lithostatic load,rather than the uppermost Eocene and Oligocene sediments, in relation of their position along thestratigraphic succession. These data suggest a burial depth of at least 3–4 km with a tectonic exhumationmainly related to the extensional phases of the Miocene age.| File | Dimensione | Formato | |
|---|---|---|---|
|
BRE-045-2014_R2.pdf
Open Access dal 13/01/2016
Descrizione: This is the peer reviewed version of the following article: [Perri F., Caracciolo L., Cavalcante F., Corrado S., Critelli S., Muto F., Dominici R. (2016) – Sedimentary and thermal evolution of the Eocene-Oligocene mudrocks from the southwestern Thrace Basin (NE Greece). Basin Research, 28, 319-339], which has been published in final form at [https://onlinelibrary.wiley.com/doi/10.1111/bre.12112]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Tipologia:
Documento in Post-print
Licenza:
Creative commons
Dimensione
3.52 MB
Formato
Adobe PDF
|
3.52 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
