Molecular technology in paleontology and paleobiology: Applications and limitations

Abdelhady, Ahmed Awad; Seuss, Barbara; Jain, Sreepat; Fathy, Douaa; Sami, Mabrouk; Ali, Ahmed; Elsheikh, Ahmed; Ahmed, Mohamed S.; Elewa, Ashraf M.T.; Hussain, Ali M.

doi:10.1016/j.quaint.2024.01.006

Cited by 2 publications

(1 citation statement)

References 235 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Organic carbon-rich shales are significantly controlled by bioproductivity and the preservation of biological precursors . Biomarkers are effective tools in the study of the organic matter accumulation mechanism, since they provide a dual interpretation of environments and sources. , The positive correlations of TOC with ACL, TAR, Pr/Ph, T/C 30 H, and taraxerane/C 30 H (Figure a, c, d, g, and i), coupled with a negative correlation for P aq (Figure b), suggest that the input of terrestrial higher plants plays a crucial role in the accumulation of organic carbon. Typically, a high Pr/Ph ratio in delta-marginal sea systems is associated more with the input of terrestrial organic materials under oxic conditions.…”

Section: Discussionmentioning

confidence: 99%

Accumulation and Quantitative Assessment of Terrigenous Organic Matter in Upper Oligocene to Lower Miocene Marine Source Rocks of the Qiongdongnan Basin

Zhang,

Hou,

et al. 2024

ACS Omega

View full text Add to dashboard Cite

The intense collision between marine and terrestrial agents results in the dual-source (marine and terrigenous) characteristics of marine source rocks. Our research quantitatively assessed terrestrial organic matter and revealed the crucial role of terrestrial organic materials in the organic matter enrichment of lower Miocene to upper Oligocene marine source rocks in the Qiongdognnan Basin. The quantitative assessment was achieved using partial least-squares analysis with eight biomarker parameters associated with n-alkanes, isoprenoids, bicadinanes, taraxerane, tricyclic terpanes, and gammacerane. Differential unloading of terrestrial organic materials based on sedimentary facies of the delta-marginal sea system were observed through oleanane and bicadinane contents. It should be noted that the diagnostic ratio of oleanane was excluded from the quantitative analysis due to the dual influence from differential unloading and contact with seawater of the terrestrial organic materials. Calculation results show that the terrestrial organic matter was highest in the delta front at 70%, followed by prodelta at 59% and inner shallow marine at 57%. From the late Oligocene to the early Miocene, the proportion of terrestrial organic matter in marine source rocks continuously increased, with the highest average value observed in the second member of the Sanya Formation at 69% and the lowest occurring in the third member of the Lingshui Formation at 46%. Increasing terrestrial organic material inputs and preservation driven by the East Asian summer monsoon provided first-order control of the accumulation of organic carbon in the Qiongdongnan Basin during late Oligocene to early Miocene, rather than the bioproductivity of marine algae. The redox conditions of the water column determine the enrichment extent of organic matter.

show abstract

Section: Discussionmentioning

confidence: 99%