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Journal Article
Journal: Geology
Published: 17 November 2023
Geology (2024) 52 (1): 87–91.
... in the phosphorus (P) contents of SPGs. Collectively, these data are most parsimoniously explained by an absolute increase in biomass burial in the late Proterozoic or early Phanerozoic by a factor of ~5 and as much as 8. The Precambrian–Phanerozoic transition was a time of progressive oxygenation of surface...
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Journal Article
Journal: Geology
Published: 22 August 2023
Geology (2023) 51 (11): 1043–1047.
... of authigenic P phases can only be reproduced when C to P ratios in marine biomass are at least 500 (mol/mol), approximately five times higher than the values that characterize the modern ocean. This constraint indicates that Archean oceans were strongly nutrient-limited. * [email protected]...
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Journal Article
Journal: Elements
Published: 01 August 2023
Elements (2023) 19 (4): 222–227.
... in a variety of ways, including their size, chemical purity, magnetic properties, and association with biomass-derived organic matter. These properties directly influence magnetite reactivity—in particular its sorbent and redox behavior—affecting its association with metals, oxyanions, and other compounds...
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Journal Article
Journal: Elements
Published: 01 February 2023
Elements (2023) 19 (1): 30–36.
...Marianne Haines; Varada Khot; Marc Strous Alkaline soda lakes are known as some of nature’s most biologically productive ecosystems. Vigorous production (photosynthetic conversion of inorganic carbon into biomass) is countered by incremental biomass degradation, which fuels and feeds a diverse...
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Journal Article
Journal: PALAIOS
Published: 28 June 2022
PALAIOS (2022) 37 (6): 219–223.
... and strata. Significantly, as arborescent gymnosperms evolved and diversified, woody plant biomass induced changes in the environments of erosion, transport, and deposition of continental sedimentary systems. Trümper et al. (2022 , this issue) provide further insights into the taphonomy and geo-engineering...
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Series: GSA Special Papers
Published: 03 May 2022
DOI: 10.1130/2021.2553(26)
EISBN: 9780813795539
... TABLE 1. DESCRIPTION OF SAMPLES AND PRODUCTS OF THEIR MIXING IN TABLE 2 AND FIGURE 2 TABLE 2. CHEMICAL COMPOSITIONS OF AVERAGE MOLDAVITE (AV. MOLD.), RIES SEDIMENTS, BIOMASS BURN RESIDUES, THEIR MIXES, AND RATIOS OF MOLDAVITE TO MIX COMPOSITIONS (SEE TABLE 1 FOR DESCRIPTION...
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Series: Geological Society, London, Special Publications
Published: 03 November 2021
DOI: 10.1144/SP514-2020-167
EISBN: 9781786209993
... organic matter (AOM), representing a proximal marine environment with emplacement of euxinic conditions at the top (total organic carbon/sulfur content and increase in AOM). At the base of the serpentinum Zone the proliferation of bacterial biomass begins, with phytoplankton playing a secondary role...
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Series: Geological Society, London, Special Publications
Published: 03 November 2021
DOI: 10.1144/SP514-2021-2
EISBN: 9781786209993
... A (darker colour→shale; lighter colour→limestone). On the right are T max and PI plots from Rock-Eval pyrolysis that indicate thermal maturity. Fig. 9. Indicators of redox conditions and biomass changes in core A, based on Rock-Eval, palynological and molecular biomarker study. Data represent...
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Journal Article
Published: 29 October 2021
Journal of Foraminiferal Research (2021) 51 (4): 249–266.
...Thaise Ricardo de Freitas; Eduardo Tadeu Bacalhau; Sibelle Trevisan Disaró ABSTRACT Foraminifers are widespread, highly abundant protists and active participants in marine carbon cycling. Their biomass might represent almost half of the total meiobenthic biomass in the deep sea. Foraminiferal...
Series: Geological Society, London, Special Publications
Published: 21 September 2021
DOI: 10.1144/SP511-2020-54
EISBN: 9781786209986
... improved our understanding of spore taphonomy, and the relationship between spore abundance and local livestock biomass and composition. Human impact inferred from palynological analysis is an important field of investigation among palaeoecological studies. Reconstructing and quantifying human...
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Series: GSA Special Papers
Published: 12 August 2021
DOI: 10.1130/2018.2536(02)
EISBN: 9780813795362
..., based on pollen-climate analog reconstruction ( Grigg et al., 2001) . CHAR values ranged between 0.03 and 3.40 particles cm –1 yr –1 , with a mean value of 0.33 particles cm –1 yr –1 ( Fig. 4 ), which represents the CHAR produced, or biomass burned ( Marlon et al., 2008) , during this period. Average...
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Journal Article
Journal: AAPG Bulletin
Published: 15 March 2021
AAPG Bulletin (2021) 105 (3): 543–573.
... and Marcellus Shales primarily was derived from marine algae and its degradation products, including bacterial biomass. Absence of odd-over-even n - alkane distributions (n - C 13 to n - C 21 range) in gas chromatograms and low gammacerane index values in Devonian source rocks are similar to those of Devonian...
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Journal Article
Published: 01 May 2020
American Mineralogist (2020) 105 (5): 609–615.
... by biology and have the ability to rapidly convert CO 2 to biomass and vice versa. For instance, carboxylation is a critical reaction in primary production and metabolic pathways like photosynthesis in which sunlight provides energy to drive carbon fixation, whereas decarboxylation is a critical reaction...
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Series: GSA Special Papers
Published: 06 March 2020
DOI: 10.1130/2020.2544(09)
EISBN: 9780813795447
... additional perturbations, these environmental disturbances led to a drastic decrease of the biomass of calcifying species and their biodiversity by ~80%, while the biodiversity of noncalcifying species was reduced by ~60%. We also suggest that the short-lived acidification caused by the Chicxulub impact...
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Journal Article
Published: 01 February 2020
Jour. Geol. Soc. India (2020) 95 (2): 179–182.
... variation with precipitation from India Meteorological Department (IMD) gridded product. A decadal decrease of about 0.5% in evapotranspiration resulting in decrease of about 0.38% in precipitation over study area is reported. Increased horticulture causes increase in black carbon due to increased biomass...
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Journal Article
Journal: Palynology
Published: 02 January 2020
Palynology (2020) 44 (1): 114–126.
...Ujjwal Layek; Siddhartha S. Manna; Prakash Karmakar Abstract Pollen loads of Apis mellifera were analysed to assess their daily pollen collection, polleniferous flora and their pollen biomass contribution in southern West Bengal, India. After that, the pollen host selection and pollen foraging...
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Journal Article
Published: 01 January 2020
The Journal of Geology (2020) 128 (1): 95–107.
... that “the exceptionalism claimed for many of the key data points is the result of exaggerations.” This is a puzzling claim because we report peaks in charcoal and biomass-burning proxies that are in the 99th percentile by size. Surely that percentile is exceptional enough. This is mostly false. The claim is correct...
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Journal Article
Published: 01 January 2020
The Journal of Geology (2020) 128 (1): 69–94.
...). This purported event is claimed by the adherents of the YDIH to have brought on extraordinary environmental changes that “triggered an ‘impact winter’ and the subsequent YD climate episode, biomass burning, late Pleistocene megafaunal extinctions, and human cultural shifts and population declines” (Wolbach et al...
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Journal Article
Journal: Geology
Published: 30 August 2019
Geology (2019) 47 (10): 958–962.
... over a range of time scales (e.g., Cole et al., 2007 ; Galy et al., 2007 ). Transient storage of CO 2 sequestered via photosynthesis in soils and biomass (biospheric POC [POC bio ]) represents a short-term (<10 5 yr) carbon sink ( Berner, 1999 ). POC bio mobilized by and transported through...
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Journal Article
Published: 01 August 2019
Russ. Geol. Geophys. (2019) 60 (8): 926–937.
...) conducted under conditions typical of the hydrocarbon generation zone (80 °C, 5 MPa). The cultivation under conditions of biomass enrichment with the Baikal diatom Synedra acus changed the composition of organic matter. The transformation degree of organic matter in the sediment after the experiment was 16...
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