Assessing biomarker syngeneity using branched alkanes with quaternary carbon (BAQCs) and other plastic contaminants

Brocks, Jochen J.; Grosjean, Emmanuelle; Logan, Graham A.

doi:10.1016/j.gca.2007.11.028

Cited by 119 publications

(76 citation statements)

References 48 publications

(76 reference statements)

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“…The organic record of Archaean rocks is commonly affected by thermal maturation (Brocks et al, 2008;Brocks, 2011;French et al, 2015). The vein chert studied here was obtained from a fresh outcrop and shows no evidence for weathering (e.g., re-oxidation of pyrite; Fig.…”

Section: Maturity Of the Dresser Kerogenmentioning

confidence: 99%

“…In Archaean rocks, however, molecular fingerprints in the conventionally analysed bitumen (i.e. the extractable 10 portion of organic matter) are commonly blurred by thermal maturation and/or contamination (Brocks et al, 2008;Brocks, 2011;French et al, 2015). In contrast, the non-extractable portion of organic matter, known as kerogen, tends to be less affected by thermal maturation and contamination and is considered to be syngenetic with the host rock (Love et al, 1995;Brocks et al, 2003b;Marshall et al, 2007;Lockhart et al, 2008).…”

mentioning

confidence: 99%

“…As the bitumen fractions of Precambrian rocks are easily biased by the incorporation of contaminants during later stages of rock history (Brocks et al, 2008;Brocks, 2011;French et al, 2015), studies have increasingly focussed on kerogen-bound compounds that are more likely to be syngenetic to the host rock (Love et al, 1995;Brocks et al, 2003b;Marshall et al, 2007;French et al, 2015). Potential volatile organic contaminants adhering to the kerogen are removed through excessive extraction and a thermal desorption step (~350°C) prior to high temperature HyPy (550°C; cf.…”

mentioning

confidence: 99%

“…Plastic-derived branched alkanes with quaternary carbon centres (BAQCs), a common contaminant in Precambrian rock samples (Brocks et al, 2008), have not been detected (Fig. S7).…”

mentioning

confidence: 99%

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Ideas and perspectives: Hydrothermally driven redistribution and sequestration of early Archaean biomass – the hydrothermal pump hypothesis

Duda¹,

Thiel²,

Bauersachs³

et al. 2017

Preprint

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Abstract. Archaean hydrothermal chert veins commonly contain abundant organic carbon of uncertain origin (abiotic vs. biotic). In this study, we analysed kerogen contained in a hydrothermal chert vein from the ca. 3.5 Ga old Dresser Formation 20 (Pilbara Craton, Western Australia). Catalytic hydropyrolysis (HyPy) of this kerogen yielded n-alkanes up to n-C 22 , with a sharp decrease in abundance beyond n-C 18 . A very similar distribution (≤ n-C 18 ) was observed in HyPy products of preextracted recent bacterial biomass, while abiotic compounds synthesised via Fischer-Tropsch-type synthesis exhibited a modal distribution. We therefore propose that the original organic matter in the Archaean chert veins has a primarily microbial origin. We hypothesise that the microbially-derived organic matter accumulated in different aquatic and 25 subsurface Dresser environments, and was then assimilated, redistributed and sequestered by hydrothermal fluids ('hydrothermal pump hypothesis').

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Section: Maturity Of the Dresser Kerogenmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…Plastic-derived branched alkanes with quaternary carbon centres (BAQCs), a common contaminant in Precambrian rock samples (Brocks et al, 2008), have not been detected (Fig. S7).…”

mentioning

confidence: 99%

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Ideas and perspectives: Hydrothermally driven redistribution and sequestration of early Archaean biomass – the hydrothermal pump hypothesis

Duda¹,

Thiel²,

Bauersachs³

et al. 2017

Preprint

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show abstract

“…Even after freeze-drying, cold storage is advisable in order to 1288 preserve labile biomarkers, such as mono-and poly-unsaturated fatty acids. 1289 series of compounds, in particular branched alkenes with quaternary carbon atoms (BAQCs), which can 1293 contaminate even freeze-dried sediment during prolonged storage (Brocks et al, 2008; Holtvoeth,with combusted foil (aluminum foil heated to 450°C for at least 4 h). 1296…”

Section: Pre-aged Material Which Can Lead To Considerable Bias In Himentioning

confidence: 99%

Scientific drilling projects in ancient lakes: Integrating geological and biological histories

Wilke

Wagner

Bocxlaer

et al. 2016

Global and Planetary Change

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Sedimentary sequences in ancient or long-lived lakes can reach several thousands of meters in thickness and often provide an unrivalled perspective of the lake's regional climatic, environmental, and biological history. Over the last few years, deep-drilling projects in ancient lakes became increasingly multi- and interdisciplinary, as, among others, seismological, sedimentological, biogeochemical, climatic, environmental, paleontological, and evolutionary information can be obtained from sediment cores. However, these multi- and interdisciplinary projects pose several challenges. The scientists involved typically approach problems from different scientific perspectives and backgrounds, and setting up the program requires clear communication and the alignment of interests. One of the most challenging tasks, besides the actual drilling operation, is to link diverse datasets with varying resolution, data quality, and age uncertainties to answer interdisciplinary questions synthetically and coherently. These problems are especially relevant when secondary data, i.e., datasets obtained independently of the drilling operation, are incorporated in analyses. Nonetheless, the inclusion of secondary information, such as isotopic data from fossils found in outcrops or genetic data from extant species, may help to achieve synthetic answers. Recent technological and methodological advances in paleolimnology are likely to increase the possibilities of integrating secondary information. Some of the new approaches have started to revolutionize scientific drilling in ancient lakes, but at the same time, they also add a new layer of complexity to the generation and analysis of sediment-core data. The enhanced opportunities presented by new scientific approaches to study the paleolimnological history of these lakes, therefore, come at the expense of higher logistic, communication, and analytical efforts. Here we review types of data that can be obtained in ancient lake drilling projects and the analytical approaches that can be applied to empirically and statistically link diverse datasets to create an integrative perspective on geological and biological data. In doing so, we highlight strengths and potential weaknesses of new methods and analyses, and provide recommendations for future interdisciplinary deep-drilling projects

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Biomarkers: Informative Molecules for Studies in Geobiology

Summons

Lincoln

2012

Fundamentals of Geobiology

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Assessing biomarker syngeneity using branched alkanes with quaternary carbon (BAQCs) and other plastic contaminants

Cited by 119 publications

References 48 publications

Ideas and perspectives: Hydrothermally driven redistribution and sequestration of early Archaean biomass – the hydrothermal pump hypothesis

Ideas and perspectives: Hydrothermally driven redistribution and sequestration of early Archaean biomass – the hydrothermal pump hypothesis

Scientific drilling projects in ancient lakes: Integrating geological and biological histories

Biomarkers: Informative Molecules for Studies in Geobiology

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