Microorganism-mediated preservation of Planolites, a common trace fossil from the Harkless Formation, Cambrian of Nevada, USA

Ahn, Soo Yeun; Babcock, Loren E.

doi:10.1016/j.sedgeo.2011.08.003

Cited by 14 publications

(2 citation statements)

References 33 publications

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“…5B-D) and a small quantity of ooids enclosed by a calcite spar-cemented outer halo consisting of darker-gray oolitic limestone comparative to the host rock, which is most likely due to the in uence of biomineralisation (Fig. 5B) (Ahn and Babcock 2012).…”

Section: Descriptionmentioning

confidence: 99%

Deep tiering Planolites isp. in the oolitic limestones of Cambrian Series 3, western Henan, China

Liu

et al. 2023

Preprint

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Planolites isp. is teeming within the oolitic limestone units in the Changhsia Formation of Cambrian Series 3 in western Henan, and its morphology is characterized by a horizontal or low-angle oblique curved cylindrical tube. These burrows occur on a easily migrating sedimentary substrate (oolitic beach), but have no lining walls and are filled with micritic, indicating that the Planolites isp. burrows were formed in a low energy microenvironment under the background of high energy oolitic shoals, where they are not susceptible to turbulent flow. Detailed analysis of the Planolites isp. burrows suggest that the trace makers should be a detritus feeder in deep tieringof sediments. Microscopic observation of ooids and the filling of burrows shows that there are some cyanobacterial filaments in the sediments around the ooids and bit of masticated and partially digested cyanobacterial filamentous fragments within the burrow infilling. indicating the trace makers of Planolites isp. feeds on the cyanobacteriabetween the ooids. The emergence of this kind of deep tiering trace fossils and the unique feeding mode represented by them reveal a more complex survival strategy than that of benthic organisms in the early Cambrian, which provides valuable materials for the study of the evolution of benthic organisms during the Cambrian Explosion.

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Section: Descriptionmentioning

confidence: 99%

Deep tiering Planolites isp. in the oolitic limestones of Cambrian Series 3, western Henan, China

Liu

et al. 2023

Preprint

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“…Bioturbation generally occurs near the sediment water interface, and burrows are made by organisms as they move and feed (Kristensen et al, 2012;O'Brien, 1987;Taylor & Golding, 1993). These burrows initially are filled with water but rapidly (most likely before microbial methanogenesis begins, collapse, infill with sediment or biomineralize (some burrows have been observed to biomineralize within weeks; Figures 7a and 7b; Ahn & Babcock, 2012;Jones & Jago, 1993;Raiswell, 1997;Sandes et al, 2000;Schieber, 2002). If biomineralized, as observed at KC151, pyrite precipitation can occur from sulfate reducing bacteria consuming the organic mucus the organisms leave on the burrow walls (Figures 6b, 6e, and 7b; Schieber, 2002;Thomsen & Vorren, 1984).…”

Section: Geochemistry Geophysics Geosystemsmentioning

confidence: 99%

Hydrate‐filled Fracture Formation at Keathley Canyon 151, Gulf of Mexico, and Implications for Non‐vent Sites

Oti

Cook

Welch

et al. 2019

Geochem Geophys Geosyst

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Near‐vertical hydrate‐filled fractures are found in subseafloor marine muds, at both advective methane vent sites and at sites without obvious methane and fluid advection (non‐vent sites). At non‐vent sites, the mechanisms that transport methane to the fractures and control how hydrate‐filled fractures form are not well understood. However, these mechanisms are important to establish, as most of Earth's natural gas hydrate is likely bound in marine mud systems. Herein, we focus on understanding the origin of hydrate and how fracture form at non‐vent sites by examining previously hydrate‐bearing fractures in conventional cores taken from Keathley Canyon 151, U.S. northern Gulf of Mexico, drilled by the Gas Hydrate Joint Industry Project in 2005. We combine information from well logs, sediment cores, and science party results and add new X‐ray computed tomography of archival sections and scanning electron microcopy of core samples to develop a conceptual model. We propose that locally generated microbial methane is transported via diffusion from small pores in marine mud into biomineralized burrows with larger pore size in a process called short‐range migration. Hydrate forms in burrows once the methane diffuses into them and the dissolved methane concentration exceeds the solubility threshold. When hydrate fills a burrow, heave from additional hydrate growth places stress on the burrow edges, expands the fracture, and creates additional void space in which methane can diffuse and continue forming hydrate. Fractures slowly propagate in the direction of maximum principal stress.

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Understanding the two-dimensional quantification of bioturbation intensity through computer modeling and statistical analysis

Eltom

Alqubalee

Babalola

2021

Int J Earth Sci (Geol Rundsch)

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Microorganism-mediated preservation of Planolites, a common trace fossil from the Harkless Formation, Cambrian of Nevada, USA

Cited by 14 publications

References 33 publications

Deep tiering Planolites isp. in the oolitic limestones of Cambrian Series 3, western Henan, China

Deep tiering Planolites isp. in the oolitic limestones of Cambrian Series 3, western Henan, China

Hydrate‐filled Fracture Formation at Keathley Canyon 151, Gulf of Mexico, and Implications for Non‐vent Sites

Understanding the two-dimensional quantification of bioturbation intensity through computer modeling and statistical analysis

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