Geochemical characteristics of terrigenous- and marine-sourced oils in Hokkaido, Japan

Waseda, Amane; Nishita, H.

doi:10.1016/s0146-6380(97)00102-2

Cited by 80 publications

(43 citation statements)

References 41 publications

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“…This is supported by the cross-plot of Pr/Ph versus C 27 / (C 27 +C 29 ) sterane of the present study (Figure 8). This also indicates the dominant terrestrial environmental settings with oxic-anoxic depositional condition (Waseda & Nishita 1998). Minor marine (pelagic) influence is also suggested by this diagram.…”

Section: Depositional Environmentsupporting

confidence: 55%

Petroleum Source Rock Properties of the Neogene Bhuban Shales, Bengal Basin, Bangladesh

Farhaduzzaman¹,

Abdullah²,

Islam³

2015

JSM

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Section: Depositional Environmentsupporting

confidence: 55%

Petroleum Source Rock Properties of the Neogene Bhuban Shales, Bengal Basin, Bangladesh

Farhaduzzaman¹,

Abdullah²,

Islam³

2015

JSM

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“…It was confirmed by many researchers, who disclosed distinctive links of organic matter with the assumed zones of organisms' habitats differing in CO 2 /O 2 ratios and corresponding to marine, fresh water, terrigenous and salt marshes' conditions [42][43][44]. They evidence that the initial isotopic discrepancies are remained, despite of transformations, and inherited at different stages of organic matter transformations [16,44] The correspondence of zones with different CO 2 /O 2 ratios to isotopic differences of carbon isotope composition can be traced not only for organic matter but for oils as well.…”

Section: Facial Isotope Differencesmentioning

confidence: 77%

Global Photosynthesis and its Regulatory Role in Natural Carbon Cycle

Ивлев¹

2017

J Ecosyst Ecogr

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Main features of global photosynthesis operating in global carbon cycle are considered. Global photosynthesis has all the basic features of normal photosynthesis of C3 type, excepting those that characterize ontogenetic changes. They include: the existence reciprocal processes assimilation and photorespiration, the possession of the key enzyme Rubisco having carboxylase/oxygenase activity, the existence of oscillatory mechanism switching over assimilation to photorespiration and back, carbon isotope fractionation in CO2 assimilation and photorespiration with opposite signs of isotope effects and some others. Considering these features of global photosynthesis, its functioning in global carbon cycle is analyzed. The photosynthetic mechanism forming carbon isotope composition of "living matter" and sedimentary organic matter is suggested. It is shown that environmental conditions of photosynthesis in the location plays a dominant role in forming carbon isotope composition of the above objects. The difference in environmental conditions determines facial isotopic shifts. The analysis of natural isotopic data confirms this conclusion. It allows saying that carbon isotopic difference between oils and organic matter is inherited from the difference between lipid fraction and other part of biomass of "living matter" that was the source of initial biogenic material. It is shown that global photosynthesis performs in global carbon cycle a regulatory role ensuring cycle's movement to the ecological compensation point. The regulatory role is based on the ability of photosynthesizing organisms to respond to the increased oxygen concentration in the course of evolution by reducing assimilation and increasing photorespiration. The achievement of ecological compensation point means that oxygen atmosphere was stabilized and further accumulation of organic matter in the Earth's crust stopped.

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“…Slightly elevated homohopane oxic-anoxic index values (0.01-0.24) in the Phase-II coals further suggest a range from oxic to oxygen-poor environments (Fig. 5h), because the homohopane ratio has been observed to increase with a decrease in dissolved oxygen (anoxia > 0.2; Waseda and Nishita, 1998). The homohopane index values of the fresh samples show a negative curvilinear negative correlation with Pr/Ph (Fig.…”

Section: Depositional Environmentsmentioning

confidence: 86%

“…We suggest that these relationships imply that aquatic plants and vascular plant material with high HI was deposited under oxic conditions. Very high Pr/n-C 17 values (4.80-9.86; Table 1b) in the unweathered coals and coaly shale imply that they were deposited in inland peat swamps and/or in highbiodegradation conditions, because Pr/n-C 17 values >1 generally indicate inland peat swamp environments (Amijaya and Littke, 2005) and active biodegradation (e.g., Waseda and Nishita, 1998). All of the studied samples are very likely to have been deposited in inland peat swamps, with associated oxic to oxygen-poor fresh water environments.…”

Section: Depositional Environmentsmentioning

confidence: 99%

Upper Eocene coal and coaly shale in the Central Myanmar Basin: Origin of organic matter and the effect of weathering

2014

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Geochemical characteristics of terrigenous- and marine-sourced oils in Hokkaido, Japan

Cited by 80 publications

References 41 publications

Petroleum Source Rock Properties of the Neogene Bhuban Shales, Bengal Basin, Bangladesh

Petroleum Source Rock Properties of the Neogene Bhuban Shales, Bengal Basin, Bangladesh

Global Photosynthesis and its Regulatory Role in Natural Carbon Cycle

Upper Eocene coal and coaly shale in the Central Myanmar Basin: Origin of organic matter and the effect of weathering

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