Carbon and oxygen isotope variations of the Middle–Late Triassic Al Aziziyah Formation, northwest Libya

Moustafa, Mohamed S.H.; Pope, Michael C.; Grossman, Ethan L.; Mriheel, Ibrahim Y.

doi:10.1016/j.jafrearsci.2016.02.011

Cited by 5 publications

(5 citation statements)

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“…The drop in δ 13 C values indicates a shift in the carbon cycle from organic carbon (reduced phase) in Permian time to dissolved carbonate (oxidized phase) in Triassic time (Gruszczynski et al, 1989;Magaritz and Holser, 1991;Morante, 1996;Horacek et al, 2007a). Enrichment of δ 13 C could result from local variations in salinity, circulation, and productivity (Grossman et al, 1993;Moustafa et al, 2016). Instead, higher δ 13 C values may be attributed to aragonite-rich sediments, which have relatively positive δ 13 C values compared to calcitic sediments (Weber and Schmalz, 1968;Swart et al, 2009;Moustafa et al, 2016).…”

Section: Stable Carbon and Oxygen Isotopesmentioning

confidence: 99%

“…Enrichment of δ 13 C could result from local variations in salinity, circulation, and productivity (Grossman et al, 1993;Moustafa et al, 2016). Instead, higher δ 13 C values may be attributed to aragonite-rich sediments, which have relatively positive δ 13 C values compared to calcitic sediments (Weber and Schmalz, 1968;Swart et al, 2009;Moustafa et al, 2016). Local minima in δ 13 C may indicate intervals of subaerial erosion and oxidation (Magaritz and Holser, 1991;Atudorei, 1999;Swart and Kennedy, 2012).…”

Section: Stable Carbon and Oxygen Isotopesmentioning

confidence: 99%

“…Marine carbonate rocks serve as a repository of ancient oceanic chemistry information due to chemical precipitation (Patterson and Walter, 1994;Jenkyns and Clayton, 1997). Carbon and oxygen stable isotopes are studied over geologic history, aiding chemostratigraphic correlations using marine carbonate rocks and fossils (Scholle and Arthur, 1980;Scholle, 1995;Kump and Arthur, 1999;Veizer et al, 1999;Moustafa et al, 2016). The δ 13 C and δ 18 O exhibit shifts correlating with major stratigraphic surfaces: a positive shift toward maximum flooding surface (MFS) and decreasing excursion toward sequence boundary (SB) (Hamon and Merzeraud, 2007;Moustafa et al, 2016;Peyravi et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Carbon and oxygen stable isotopes are studied over geologic history, aiding chemostratigraphic correlations using marine carbonate rocks and fossils (Scholle and Arthur, 1980;Scholle, 1995;Kump and Arthur, 1999;Veizer et al, 1999;Moustafa et al, 2016). The δ 13 C and δ 18 O exhibit shifts correlating with major stratigraphic surfaces: a positive shift toward maximum flooding surface (MFS) and decreasing excursion toward sequence boundary (SB) (Hamon and Merzeraud, 2007;Moustafa et al, 2016;Peyravi et al, 2021). Carbon isotopes, mainly derived from seawater at sediment deposition time, maintain their marine signature over time (Garrels and Abraham, 1981;Vahrenkamp, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…δ 18 O variations provide valuable information on climate changes and diagenetic fluids (Sharifi-Yazdi et al, 2019;McConnaughey, 1989;deMenocal et al, 1990;Moustafa et al, 2016). Spectral gamma-ray logs offer valuable insights into stratigraphy, formation composition, and lithology (Fertl and Rieke, 1980;Davies et al, 1996;Hampson et al, 2005;Tavakoli, 2017;Khalifa and Mills, 2020;Farouk et al, 2022;Farouk et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

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Gamma-ray, stable carbon and oxygen isotope chemostratigraphy and sequence stratigraphy of the Lower Mahil Formation (KS-1 Khuff-Equivalent), Northern Oman

Moustafa,

Al Raqaishi,

El-Ghali

et al. 2023

Front. Earth Sci.

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This research presents findings from a study focused on the Lower Triassic (Induan) Lower Mahil KS-1 Formation, situated on a homoclinal carbonate platform in Northern Oman. The sequence stratigraphy of this formation is characterized by a considerable thickness variation, slumps, and breccia deposits related to active normal faults coupled with intra-basin growth faults. The main objective was to establish a reliable stratigraphic framework for the Lower Mahil KS-1 Formation by integrating high-resolution carbon isotope data along with high-resolution spectral and total gamma-ray data. To achieve this, whole-rock samples were analyzed for δ13C and δ18O isotopes. Spectral and total gamma-ray records were obtained for the formation. Isotope sampling is conducted every 0.5 m in the Saiq Plateau and Wadi Sahtan sections. Furthermore, spectral gamma-ray measurements were taken at intervals of 10 cm from the logged sections. Within the third-order sequence, the spectral gamma-ray data revealed a distinct sea-level trend, leading to the division of KS1 into two different parts. Five fourth-order depositional sequences were identified by analyzing stable carbon isotopes, uranium, and total gamma-ray profiles. Four of these sequences displayed complete patterns, reflecting transgression and regression phases, while the fifth sequence was incomplete and solely comprised a transgressive phase. An essential outcome of the study is the correlation of the δ13C curve of the Lower Mahil KS-1 Formation with other similar formations around the Tethys region. This correlation indicates that the Lower Mahil KS-1 Formation captures the near-primary signal of carbon isotope variations in coeval seawater. As a result, it holds promise as a reference section for future investigations and studies in this field. Compared to the prior investigation, this study utilizes data with higher precision, capturing spectral gamma-ray measurements at 10 cm intervals and isotope measurements at 50 cm intervals. Furthermore, the study’s focus is confined explicitly to KS1.

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