Distributed Sequestration and Release of PAHs in Weathered Sediment:  The Role of Sediment Structure and Organic Carbon Properties

2002 ◽  
Vol 36 (12) ◽  
pp. 2636-2644 ◽  
Author(s):  
Karl J. Rockne ◽  
Leslie M. Shor ◽  
L. Y. Young ◽  
Gary L. Taghon ◽  
David S. Kosson
Keyword(s):  
Organic Carbon ◽  
Sediment Structure

THE ROLE OF ALLUVIAL LANDFORMS IN STORING SOIL ORGANIC CARBON: A CASE STUDY FROM HUMID-TEMPERATE WESTERN KENTUCKY

2017 ◽  
Author(s):  
Benedict W. Ferguson ◽  
◽  
Gary E. Stinchcomb
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Western Kentucky

scholarly journals The Role of Organic Matter on Uranium Precipitation in Zoovch Ovoo, Mongolia

Minerals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 310 ◽  
Author(s):  
Dimitrios Rallakis ◽  
Raymond Michels ◽  
Marc Brouand ◽  
Olivier Parize ◽  
Michel Cathelineau
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Late Cretaceous ◽  
Uranium Deposit ◽  
Vitrinite Reflectance ◽  
Driven Systems ◽  
Sem Observation ◽  
Organic Matter Type ◽  
Clay Layers

The Zoovch Ovoo uranium deposit is located in East Gobi Basin in Mongolia. It is hosted in the Sainshand Formation, a Late Cretaceous siliciclastic reservoir, in the lower part of the post-rift infilling of the Mesozoic East Gobi Basin. The Sainshand Formation corresponds to poorly consolidated medium-grained sandy intervals and clay layers deposited in fluvial-lacustrine settings. The uranium deposit is confined within a 60- to 80-m-thick siliciclastic reservoir inside aquifer driven systems, assimilated to roll-fronts. As assessed by vitrinite reflectance (%Rr < 0.4) and molecular geochemistry, the formation has never experienced significant thermal maturation. Detrital organic matter (type III and IV kerogens) is abundant in the Zoovch Ovoo depocenter. In this framework, uranium occurs as: (i) U-rich macerals without any distinguishable U-phase under SEM observation, containing up to 40 wt % U; (ii) U expressed as UO2 at the rims of large (several millimeters) macerals and (iii) U oxides partially to entirely replacing macerals, while preserving the inherited plant texture. Thus, uranium is accumulated gradually in the macerals through an organic carbon–uranium epigenization process, in respect to the maceral’s chemistry and permeability. Most macerals are rich in S and, to a lesser extent, in Fe. Frequently, Fe and S contents do not fit the stoichiometry of pyrite, although pyrite also occurs as small inclusions within the macerals. The organic matter appears thus as a major redox trap for uranium in this kind of geological setting.

Phytolith-occluded organic carbon as a mechanism for long-term carbon sequestration in a typical steppe: The predominant role of belowground productivity

2017 ◽  
Vol 577 ◽  
pp. 413-417 ◽  
Author(s):  
Limin Qi ◽  
Frank Yonghong Li ◽  
Zhangting Huang ◽  
Peikun Jiang ◽  
Taogetao Baoyin ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Organic Carbon ◽  
Predominant Role ◽  
Typical Steppe ◽  
Belowground Productivity

Delineating the role of calcium in the large‐scale distribution of metal‐bound organic carbon in soils

2021 ◽  
Author(s):  
Simin Wang ◽  
Yufu Jia ◽  
Ting Liu ◽  
Yiyun Wang ◽  
Zongguang Liu ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Large Scale

Sunlight induced aggregation of dissolved organic matter: Role of proteins in linking organic carbon and nitrogen cycling in seawater

2019 ◽  
Vol 654 ◽  
pp. 872-877 ◽  
Author(s):  
Luni Sun ◽  
Wei-Chun Chin ◽  
Meng-Hsuen Chiu ◽  
Chen Xu ◽  
Peng Lin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Dissolved Organic Matter ◽  
Nitrogen Cycling ◽  
Carbon And Nitrogen ◽  
Carbon And Nitrogen Cycling ◽  
Induced Aggregation

scholarly journals The role of tephra in enhancing organic carbon preservation in marine sediments

2019 ◽  
Vol 192 ◽  
pp. 480-490 ◽  
Author(s):  
Jack Longman ◽  
Martin R. Palmer ◽  
Thomas M. Gernon ◽  
Hayley R. Manners
Keyword(s):  
Organic Carbon ◽  
Marine Sediments

The significant role of inorganic matters in preservation and stability of soil organic carbon in the Baoji and Luochuan loess/paleosol profiles, Central China

CATENA ◽  
2013 ◽  
Vol 109 ◽  
pp. 186-194 ◽  
Author(s):  
Chao Wang ◽  
Fuchun Li ◽  
Huanzhi Shi ◽  
Zhangdong Jin ◽  
Xuhui Sun ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Significant Role ◽  
Central China

scholarly journals The role of clay content and mineral surface area for soil organic carbon storage in an arable toposequence

2021 ◽  
Author(s):  
Steffen A. Schweizer ◽  
Carsten W. Mueller ◽  
Carmen Höschen ◽  
Pavel Ivanov ◽  
Ingrid Kögel-Knabner
Keyword(s):  
Organic Carbon ◽  
Surface Area ◽  
Agricultural Soils ◽  
Mineral Soil ◽  
Clay Content ◽  
Clay Soils ◽  
Mineral Surface ◽  
Mineral Surface Area ◽  
The Impact

AbstractCorrelations between organic carbon (OC) and fine mineral particles corroborate the important role of the abundance of soil minerals with reactive surfaces to bind and increase the persistence of organic matter (OM). The storage of OM broadly consists of particulate and mineral-associated forms. Correlative studies on the impact of fine mineral soil particles on OM storage mostly combined data from differing sites potentially confounded by other environmental factors. Here, we analyzed OM storage in a soil clay content gradient of 5–37% with similar farm management and mineral composition. Throughout the clay gradient, soils contained 14 mg OC g−1 on average in the bulk soil without showing any systematic increase. Density fractionation revealed that a greater proportion of OC was stored as occluded particulate OM in the high clay soils (18–37% clay). In low clay soils (5–18% clay), the fine mineral-associated fractions had up to two times higher OC contents than high clay soils. Specific surface area measurements revealed that more mineral-associated OM was related to higher OC loading. This suggests that there is a potentially thicker accrual of more OM at the same mineral surface area within fine fractions of the low clay soils. With increasing clay content, OM storage forms contained more particulate OC and mineral-associated OC with a lower surface loading. This implies that fine mineral-associated OC storage in the studied agricultural soils was driven by thicker accrual of OM and decoupled from clay content limitations.

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