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• W2932671954 abstract "Earlier geological works showed that Codó Formation - CF (Parnaíba Basin, Brazil) has been deposited in the Aptian, and suffered the influence of various transgressive-regressive marine cycles, thus suggesting various depositional environment possibilities from saline lacustrine deltaic to shallow marine during sedimentation. Cretaceous potential source rock samples from the CF were investigated to identify diagnostic biomarkers in order to ascertain paleoenvironmental conditions of deposition and thermal evolution of organic matter. The TOC results showed low organic matter (OM) contents and Rock-Eval analysis implying low thermal evolution of organic matter. GC-MS analysis showed a great diversity of biomarkers within the five studied samples. The main features of organic matter composition were: low content of n-alkanes, Ph » Pr, presence of i-25, i-30 (squalane) and gammacerane thus suggesting saline to hypersaline depositional environment. The biomarkers fingerprint showed a full series of ββ hopanes and Δ13(18) hopenes, αααR and βααR steranes, and Δ5 and Δ8(14) sterenes, pointing out immature OM. Several C30 steranes have been detected, among them 4α(methyl)- and 4β(methyl)-24-ethylcholestane, 24-n-propylcholestane and 24-isopropylcholestane (all identified by co-injection) and dinosteranes, which some of them are indicative of a marine depositional system." @default.
• W2932671954 created "2019-04-11" @default.
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• W2932671954 date "2019-06-01" @default.
• W2932671954 modified "2023-10-18" @default.
• W2932671954 title "Biomarkers in Cretaceous sedimentary rocks from the Codó Formation - Parnaíba Basin: Paleoenvironmental assessment" @default.
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• W2932671954 doi "https://doi.org/10.1016/j.jsames.2019.03.025" @default.
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