A Field Study of the Chemical Weathering of Ancient Sedimentary Organic Matter

Petsch, S.

doi:10.1180/minmag.1998.62a.2.274

Cited by 180 publications

(95 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Conversely, pyrite is very sensitive and its loss attains 90 % (Fig 12). These results are in agreement with some previous studies; indeed Petsch et al (2000) showed a FOM partial mineralization along weathering profiles, whereas Copard et al (2006) showed that weathering process does not affect all FOM compounds in the same way.…”

Section: Factors Controlling Fom Alterationsupporting

confidence: 83%

“…12). This strong sensitivity of pyrite to weathering processes was already evidenced in previous study (Petsch et al, 2000).…”

Section: Fom Evolution During Rocks Weatheringmentioning

confidence: 55%

“…For examples, Petsch et al, (2000) showed that FOM contained in organic carbon rich bedrocks (black shales) is very sensitive and losses recorded can reach 60 to 100 % along weathering profiles. Conversely, Fredericks et al (1983) showed that some mature bituminous coals are more resistant and C-losses reach only 20 % in the same context.…”

Section: Callovo-oxfordian Marly Limestones Fom Representativenessmentioning

confidence: 99%

See 2 more Smart Citations

Quantitative palynofacies analysis as a new tool to study transfers of fossil organic matter in recent terrestrial environments

Graz

Di-Giovanni

Copard

et al. 2010

International Journal of Coal Geology

View full text Add to dashboard Cite

Abstract:Classical palynofacies method, which consists of an organic concentrate microscopic qualitative observation after mineral phase dissolution, is commonly used in order to study sedimentary organic matter. In the present study we develop a new quantitative palynofacies method that allows organic particles mass concentrations to be determined in studied samples. This method was developed to help quantify the input of fossil Quantitative palynofacies analysis is a new method adapted to such study, but can also be applied to other palynological, paleoenvironmental or archeological studies.

show abstract

Section: Factors Controlling Fom Alterationsupporting

confidence: 83%

“…12). This strong sensitivity of pyrite to weathering processes was already evidenced in previous study (Petsch et al, 2000).…”

Section: Fom Evolution During Rocks Weatheringmentioning

confidence: 55%

Section: Callovo-oxfordian Marly Limestones Fom Representativenessmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative palynofacies analysis as a new tool to study transfers of fossil organic matter in recent terrestrial environments

Graz

Di-Giovanni

Copard

et al. 2010

International Journal of Coal Geology

View full text Add to dashboard Cite

show abstract

“…Although the factors affecting the rate of fossil OC weathering are currently under investigation [Petsch et al, 2000[Petsch et al, , 2001, many biogeochemical models aimed at understanding the controls on atmospheric oxygen concentrations over geologic time assume complete oxidation of fossil OC on the continents [e.g., Garrels and Lerman, 1984;Berner and Canfield, 1989;van Cappellen and Ingall, 1996]. Current data from the Santa Clara River and other drainage basins of similar morphologies [Kao and Liu, 1996;Blair et al, 2003] indicate export of fossil OC to the coastal ocean likely as a result of rapid physical denudation and sediment transport.…”

Section: Oceanic Fluxes Of Kerogen and Bitumen And Their Possible Impmentioning

confidence: 99%

Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ¹⁴C and δ¹³C signatures of organic compound classes

Komada

Druffel

Hwang

2005

Global Biogeochemical Cycles

View full text Add to dashboard Cite

Chemical and isotopic variability of particulate organic carbon (POC) was examined in samples from the Santa Clara River watershed and adjacent shelf to investigate the processing of fossil POC derived from bedrock. The Santa Clara is a small coastal river that drains mountainous terrain in southern California, United States. Organic carbon in shale, river suspended sediment, and coastal marine sediment was separated into three operationally defined organic compound classes: total extractable lipids, acid hydrolyzable material, and the nonhydrolyzable residue. In all samples, the nonhydrolyzable fraction was dominant (∼50% of POC), while lipids and acid hydrolyzable moieties were relatively minor (≤22 and ≤13%, respectively). The Δ14C and δ13C signatures of the isolated fractions varied dramatically, not only across different sample types, but also for a given sample. At the shale exposure, low Δ14C values (<−760‰) indicated dominance of ancient C in all three organic compound classes. In downstream samples, the extractable lipids displayed the lowest Δ14C values (<−500‰), while the acid hydrolyzable fraction was predominantly modern (Δ14C > −30‰). The nonhydrolyzable fraction displayed intermediate Δ14C values (<−190‰) that increased steadily downstream with decreasing δ13C values (−22.2 to −25.0‰), possibly from mixing of shale and surface soil POC. Our results indicate that most of the fossil POC discharged by the Santa Clara is composed of non‐acid hydrolyzable material, but its elusive molecular structure and marine‐like δ13C signature may render its detection in the ocean difficult. In contrast, fossil lipids may be more amenable to detection if their resistant components (e.g., asphaltic material) are unique to crustal sources.

show abstract

“…Dark-colored slates may contain mature sedimentary organic matter (e.g., Zimmerle and Stribrny 1992). During oxidative weathering, even during only a few decades , the amount of organic matter in black slates can decrease significantly (e.g., Fischer and Gaupp 2005;Fischer et al 2009;Littke et al 1991;Petsch et al 2000). At least parts of the Fruchtschiefer slates (Matthes 1990;Peschel and Franz 1968) were formed of organic matter-bearing Ordovician Griffelschiefer (Falk and Wiefel 1995;Linnemann and Heuse 2000).…”

Section: Introductionmentioning

confidence: 99%

Weathering of Fruchtschiefer building stones: mineral dissolution or rock disaggregation?

et al. 2011

View full text Add to dashboard Cite

Building stones manufactured from contact metamorphic slates (Fruchtschiefer slate) from Theuma (Sachsen, Germany) were investigated for mineralogical alterations as well as for changes in porosity and surface roughness due to weathering. After weathering periods of several years to decades, the originally dark gray-colored slates show pale spots of several centimeters in size at the surface of building stones. The dark-colored and lightcolored sections of the slate show no differences in mineralogy. Surface weathering did not result in newly precipitated minerals. It was also found that the observed differences in color are not caused by variations in sedimentary organic carbon concentration or in sulfide/sulfate concentrations. Obtained results instead indicate that dark surface sections may show a thin cover of recent organic matter (OM), e.g., living OM, soot, dirt, etc. Microscopic investigations suggested that this cover was exfoliated at light-colored surface sections. The observed disaggregation of the upper 2 mm of the building block material results in an increase in porosity. Porosity of black (unweathered) slate is\2 vol.%. Due to weathering, the slate's pores with diameters [1 lm show a significant increase in frequency compared to the original pore size distribution. Porosity of weathered rock volumes increased to approx. 8 vol.%. Discolored surface sections show a higher surface roughness (root-mean-square roughness, Rq * 1 lm) compared to dark-colored slate surfaces (Rq * 200 nm), both data are for cleavage planes. Preferentially, the discolored surface sections are located close to the edges of cut stones. This and the alteration in porosity, pore size, and surface roughness indicate that color changes of the slate are largely influenced by rock disaggregation proceeding from the edges into the center rather than by mineral dissolution/ precipitation processes.

show abstract

A Field Study of the Chemical Weathering of Ancient Sedimentary Organic Matter

Cited by 180 publications

References 25 publications

Quantitative palynofacies analysis as a new tool to study transfers of fossil organic matter in recent terrestrial environments

Quantitative palynofacies analysis as a new tool to study transfers of fossil organic matter in recent terrestrial environments

Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ¹⁴C and δ¹³C signatures of organic compound classes

Weathering of Fruchtschiefer building stones: mineral dissolution or rock disaggregation?

Contact Info

Product

Resources

About

A Field Study of the Chemical Weathering of Ancient Sedimentary Organic Matter

Cited by 180 publications

References 25 publications

Quantitative palynofacies analysis as a new tool to study transfers of fossil organic matter in recent terrestrial environments

Quantitative palynofacies analysis as a new tool to study transfers of fossil organic matter in recent terrestrial environments

Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ14C and δ13C signatures of organic compound classes

Weathering of Fruchtschiefer building stones: mineral dissolution or rock disaggregation?

Contact Info

Product

Resources

About

Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ¹⁴C and δ¹³C signatures of organic compound classes