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In the Neoproterozoic of the Aldan-Maya depression, the rocks of the Malgin (MF), Tsipanda (TF) and Kumakha (KF) Formations are enriched in organic matter (OM) and can be classified as source rocks. High generation potential is typical for the MF and TF (267–511 mg HC/g TOC). The thermal maturity level of OM corresponds to MC12 grade (Tmax is 438–443ºC). Based on the biomarker distribution, the biological precursors of OM in these formations are mostly prokaryotes, including cyanobacteria (hopanes, acyclic biomarkers) and to a lesser extent eukaryotes (the presence of steranes С27-C30) that lived in the Precambrian (the presence of 12- and 13-monomethylalkanes) marine (absence of continental biomarkers, the distributions of acyclic alkanes and steranes) basin with clayey sedimentation (high content of diasteranes). The absence of steranes in some samples (the absence of eukaryotes in the source OM), the MF is likely to have been partly deposited before the emergence of eukaryotes. Most samples have elevated concentrations of low-molecular tricyclanes (2C19-20/C23-26>1), which can be attributed to the specificity of the source biota, although it is not typical for marine OM. A rare homologous series of 2,7-dimethylalkanes that has been recently found by other researchers in some Precambrian strata is present in several samples of the MF and KF and totally absent from all samples of the TF. This may indicate the differences in its biota, depositional environments or its evolution during diagenesis and catagenesis. A distinctive feature of the TF is the high content of ethylcholestanes (C29/C27=2.5).
In the Neoproterozoic of the Aldan-Maya depression, the rocks of the Malgin (MF), Tsipanda (TF) and Kumakha (KF) Formations are enriched in organic matter (OM) and can be classified as source rocks. High generation potential is typical for the MF and TF (267–511 mg HC/g TOC). The thermal maturity level of OM corresponds to MC12 grade (Tmax is 438–443ºC). Based on the biomarker distribution, the biological precursors of OM in these formations are mostly prokaryotes, including cyanobacteria (hopanes, acyclic biomarkers) and to a lesser extent eukaryotes (the presence of steranes С27-C30) that lived in the Precambrian (the presence of 12- and 13-monomethylalkanes) marine (absence of continental biomarkers, the distributions of acyclic alkanes and steranes) basin with clayey sedimentation (high content of diasteranes). The absence of steranes in some samples (the absence of eukaryotes in the source OM), the MF is likely to have been partly deposited before the emergence of eukaryotes. Most samples have elevated concentrations of low-molecular tricyclanes (2C19-20/C23-26>1), which can be attributed to the specificity of the source biota, although it is not typical for marine OM. A rare homologous series of 2,7-dimethylalkanes that has been recently found by other researchers in some Precambrian strata is present in several samples of the MF and KF and totally absent from all samples of the TF. This may indicate the differences in its biota, depositional environments or its evolution during diagenesis and catagenesis. A distinctive feature of the TF is the high content of ethylcholestanes (C29/C27=2.5).
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