Kelden Pehr

Compound-specific carbon isotope measurements of individual lipid biomarkers from immature Ediacaran rocks of Baltica

Kelden Pehr, Allison A. Baczynski, Andrey Bekker, A. Hoffmann et autres

Compound-specific carbon isotope ratios (CSIA) were measured for a suite of lipid biomarker compounds extracted from immature, late Ediacaran sedimentary rocks from drill cores sampled across Baltica. Using a newly developed picomolar‐scale CSIA (pico‐CSIA) method, we measured carbon isotope compositions of the …

us, Afrique du Sud, gb (code pays fourni par la source)

Discovery and exploration of active off-axis hydrothermal vents at 9° 54'N East Pacific Rise

Jill M. McDermott, Ross Parnell‐Turner, Thibaut Barreyre, Santiago Herrera et autres

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Potential energy sources for the deep continental biosphere in isolated anoxic brines

William S. Dowd, Christopher J. Schuler, Cara Santelli, Brandy M. Toner et autres

In isolated fracture networks in the Precambrian Shield, long-term water and rock interactions produce saline anoxic fluids that host extant microbial communities deep within the continental subsurface. Light and oxygen (O2) are absent in these environments. Thus, chemotrophic organisms inhabiting these systems …

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Discovery of active off-axis hydrothermal vents at 9° 54′N East Pacific Rise

Jill M. McDermott, Ross Parnell‐Turner, Thibaut Barreyre, Santiago Herrera et autres

Comprehensive knowledge of the distribution of active hydrothermal vent fields along midocean ridges is essential to understanding global chemical and heat fluxes and endemic faunal distributions. However, current knowledge is biased by a historical preference for on-axis surveys. A scarcity of high-resolution …

us, no, fr (code pays fourni par la source)

LATE EDIACARAN COMMUNITIES ACROSS BALTICA WERE SEVERELY IMPACTED BY ENVIRONMENTAL CHANGES PRIOR TO THE CAMBRIAN PERIOD

Adam Hoffmann, Kelden Pehr, А. Б. Кузнецов, V. N. Podkovyrov et autres

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Determining the origin of thermogenic organic matter in high temperature hydrothermal vent fluids

Kelden Pehr, Jill M. McDermott

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Preservation and Distributions of Covalently Bound Polyaromatic Hydrocarbons in Ancient Biogenic Kerogens and Insoluble Organic Macromolecules

Kelden Pehr, Rose Bisquera, Andrew Bishop, Frantz Ossa Ossa et autres

The likelihood of finding pristine molecular biosignatures preserved in Earth's oldest rocks or on other planetary bodies is low, and new approaches are needed to assess the origins of highly altered and recalcitrant organic matter. In this study, we aim to understand …

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Investigation of the Composition and Preservation Potential of Precambrian Sedimentary Organic Matter and Lipid Biosignatures

Kelden Pehr

The preservation of organic matter in the sedimentary rock record is strongly controlled by thermal maturity. This poses a problem when investigating Precambrian or extraterrestrial samples as they are typically heavily altered. In order to preform detailed biomarker analysis on very ancient …

Late Ediacaran Marine Shelf Environments: Evidence for Nutrient Control on Local Community Structure and Productivity

Kelden Pehr, Gordon D. Love, A. Hoffmann, А. Б. Кузнецов et autres

Preview this conference paper: Late Ediacaran Marine Shelf Environments: Evidence for Nutrient Control on Local Community Structure and Productivity, Page 1 of 1 < Previous page | Next page > /docserver/preview/fulltext/2214-4609/2019/O66-1.gif

us, ru, ua (code pays fourni par la source)

Ediacara biota flourished in oligotrophic and bacterially dominated marine environments across Baltica

Kelden Pehr, Gordon D. Love, А. Б. Кузнецов, V. N. Podkovyrov et autres

Abstract Middle-to-late Ediacaran (575–541 Ma) marine sedimentary rocks record the first appearance of macroscopic, multicellular body fossils, yet little is known about the environments and food sources that sustained this enigmatic fauna. Here, we perform a lipid biomarker and stable isotope (δ15Ntotal …

us, ru, ua (code pays fourni par la source)

EXCEPTIONAL PRESERVATION OF LIPID BIOMARKERS REVEALS NEW INSIGHTS INTO LATE EDIACARAN OLIGOTROPHIC SHALLOW-MARINE COMMUNITIES AND ENVIRONMENTS ON BALTICA

Kelden Pehr, Gordon D. Love, Anton Kuznetsov, V. N. Podkovyrov et autres

A LIPID BIOMARKER INVESTIGATION OF OLIGOTROPHIC EDIACARAN MARINE ENVIRONMENTS ACROSS THE EAST EUROPEAN PLATFORM

Kelden Pehr, Gordon D. Love, Andrey Bekker, Anton Kuznetsov et autres