Sedimentary organic matter as a proficient tool for the palaeoenvironmental and palaeodepositional settings on Gondwana coal deposits

Journal of Petroleum Exploration and Production Technology ◽

10.1007/s13202-021-01331-x ◽

2021 ◽

Author(s):

Neha Aggarwal

Keyword(s):

Organic Matter ◽

Sedimentary Organic Matter ◽

Sedimentary Deposits ◽

Worldwide Distribution ◽

Depositional Processes ◽

Coal Deposits ◽

Continental Deposits ◽

Different Types ◽

Anoxic Environment ◽

Gondwana Sediments

AbstractPalynofacies is based on the different types of the dispersed/sedimentary organic matter (DOM/SOM) and has been used as a proficient proxy for the palaeoclimatic reconstructions in sedimentary deposits of various time spans. It has also been acknowledged as an effective tool in the different domains like sequence biostratigraphy, palyno-biostratigraphy, palaeodepositional history, identification for depositional processes, oxic–anoxic environment, and variations in the water depth. It has been emerged as an analytical tool in palaeoclimatic reconstruction, which could complement geophysical and geochemical datasets. Since long palynofacies analysis has been exclusively applied in the marine sediments, it has recently dragged the attention of many researchers as a significant parameter for palaeoclimatic interpretation in continental deposits. In the last few decades, more consideration was focused on palynofacies that have become an essential proxy in the biostratigraphic and other non-biostratigraphic fields due to its requirement in the petroleum industries. The present study provides a basic idea of dispersed organic matter characterization, methodology, interpretations, and its application with special emphasis on the Gondwana deposits. The study also includes the summary of the worldwide distribution of the Gondwana sediments, especially for palaeodepositional settings through palynofacies along with other parameters.

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Characterization of sedimentary organic matter and depositional processes in Mandovi estuary, western India: An integrated lipid biomarker, sedimentological and stable isotope approach

Applied Geochemistry ◽

10.1016/j.apgeochem.2021.105041 ◽

2021 ◽

pp. 105041

Author(s):

Mehta Bulbul ◽

Yadav Ankit ◽

Sayak Basu ◽

Ambili Anoop

Keyword(s):

Organic Matter ◽

Stable Isotope ◽

Sedimentary Organic Matter ◽

Western India ◽

Depositional Processes ◽

Lipid Biomarker ◽

Mandovi Estuary

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Evidence and origin of different types of sedimentary organic matter from a Paleoproterozoic orogenic Au deposit

Precambrian Research ◽

10.1016/j.precamres.2017.07.028 ◽

2017 ◽

Vol 299 ◽

pp. 319-338 ◽

Cited By ~ 10

Author(s):

Aileen Mirasol-Robert ◽

Hendrik Grotheer ◽

Julien Bourdet ◽

Alexandra Suvorova ◽

Kliti Grice ◽

...

Keyword(s):

Organic Matter ◽

Sedimentary Organic Matter ◽

Different Types

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Biomarker distributions in different types of sedimentary organic matter isolated from the same sample: Implications for biomarker correlations

10.2172/10161023 ◽

1994 ◽

Author(s):

K.B. Anderson

Keyword(s):

Organic Matter ◽

Sedimentary Organic Matter ◽

Different Types

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Amino acids and amino sugars as indicators of the source and degradation state of sedimentary organic matter

Marine Chemistry ◽

10.1016/j.marchem.2021.103931 ◽

2021 ◽

Vol 230 ◽

pp. 103931

Author(s):

Jin-E Wei ◽

Yan Chen ◽

Jian Wang ◽

Shi-Bo Yan ◽

Hong-Hai Zhang ◽

...

Keyword(s):

Amino Acids ◽

Organic Matter ◽

Sedimentary Organic Matter ◽

Amino Sugars ◽

Degradation State

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Geochemistry of Sphalerite from the Permian Volcanic-Hosted Massive Sulphide (VHMS) Deposits in the Tasik Chini Area, Peninsular Malaysia: Constraints for Ore Genesis

Minerals ◽

10.3390/min11070728 ◽

2021 ◽

Vol 11 (7) ◽

pp. 728

Author(s):

Mohd Basril Iswadi Basori ◽

Sarah E. Gilbert ◽

Khin Zaw ◽

Ross R. Large

Keyword(s):

Variable Temperature ◽

Mineral Chemistry ◽

Peninsular Malaysia ◽

Massive Sulphide ◽

Compositional Variation ◽

Volcanic Origin ◽

Sedimentary Deposits ◽

Depositional Processes ◽

Tasik Chini ◽

Vhms Deposits

The Bukit Botol and Bukit Ketaya deposits are two examples of volcanic-hosted massive sulphide (VHMS) deposits that occur in the Tasik Chini area, Central Belt of Peninsular Malaysia. The mineralisation is divided into subzones distinguished by spatial, mineralogical, and textural characteristics. The primary sulphide minerals include pyrite, chalcopyrite, sphalerite, and galena, with lesser amounts of Sn- and Ag-bearing minerals, with Au. However, pyrrhotite is absent from both deposits. This study presents the results of sphalerite chemistry analysed by using an electron microprobe. Two types of sphalerite are recognised: sphalerite from the Bukit Botol deposit reveals a range of <DL to 24.0 mole% FeS, whereas sphalerite from the Bukit Ketaya deposit shows a range of <DL to 3 mole% FeS. Significant variations are shown in Zn, Cu, Cd, and Ag levels. Although the sphalerite has a wide variation in composition, a discernible decreasing Fe trend is exhibited from the stringer zone towards massive sulphide. This compositional variation in sphalerites may in part reflect variable temperature and activity of sulphur in the hydrothermal fluids during ore formation. Alternatively, the bimodal composition variations suggest that mineral chemistry relates to contrasting depositional processes. The Zn/Cd ratios for sphalerite from both these deposits are similar to those exhibited by volcano−sedimentary deposits with a volcanic origin. Therefore, the consistently low Cd concentrations and moderate to high Zn/Cd ratios suggest mixing of seawater and minor magmatic fluids controlling the chemistry of sphalerite at both deposits during their formation.

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Historical reconstructions of sedimentary organic matter sources and phytoplankton evolution in the Jiaozhou Bay based on sterols and carbon isotope

Marine Pollution Bulletin ◽

10.1016/j.marpolbul.2021.112109 ◽

2021 ◽

Vol 165 ◽

pp. 112109

Author(s):

Yueqi Wang ◽

Jinming Song ◽

Liqin Duan ◽

Huamao Yuan ◽

Xuegang Li ◽

...

Keyword(s):

Organic Matter ◽

Carbon Isotope ◽

Jiaozhou Bay ◽

Sedimentary Organic Matter ◽

Organic Matter Sources ◽

Historical Reconstructions

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Difference Analysis of Organic Matter Enrichment Mechanisms in Upper Ordovician-Lower Silurian Shale from the Yangtze Region of Southern China and Its Geological Significance in Shale Gas Exploration

Geofluids ◽

10.1155/2019/9524507 ◽

2019 ◽

Vol 2019 ◽

pp. 1-14 ◽

Cited By ~ 1

Author(s):

Ming Wen ◽

Zhenxue Jiang ◽

Kun Zhang ◽

Yan Song ◽

Shu Jiang ◽

...

Keyword(s):

Organic Matter ◽

Shale Gas ◽

Southern China ◽

Sedimentary Organic Matter ◽

Gas Content ◽

Silicon Isotope ◽

Upper Ordovician ◽

Lower Silurian ◽

Excess Silicon ◽

Lower Yangtze

The upper Ordovician-lower Silurian shale has always been the main target of marine shale gas exploration in southern China. However, the shale gas content varies greatly across different regions. The organic matter content is one of the most important factors in determining gas content; therefore, determining the enrichment mechanisms of organic matter is an important problem that needs to be solved urgently. In this paper, upper Ordovician-lower Silurian shale samples from the X-1 and Y-1 wells that are located in the southern Sichuan area of the upper Yangtze region and the northwestern Jiangxi area of the lower Yangtze region, respectively, are selected for analysis. Based on the core sample description, well logging data analysis, mineral and elemental composition analysis, silicon isotope analysis, and TOC (total organic carbon) content analysis, the upper Ordovician-lower Silurian shale is studied to quantitatively calculate its content of excess silicon. Subsequently, the results of elemental analysis and silicon isotope analysis are used to determine the origin of excess silicon. Finally, we used U/Th to determine the characteristics of the redox environment and the relationship between excess barium and TOC content to judge paleoproductivity and further studied the mechanism underlying sedimentary organic matter enrichment in the study area. The results show that the excess silicon from the upper Ordovician-lower Silurian shale in the upper Yangtze area is derived from biogenesis. The sedimentary water body is divided into an oxygen-rich upper water layer that has higher paleoproductivity and a strongly reducing lower water that is conducive to the preservation of sedimentary organic matter. Thus, for the upper Ordovician-lower Silurian shale in the upper Yangtze region, exploration should be conducted in the center of the blocks with high TOC contents and strongly reducing water body. However, the excess silicon in the upper Ordovician-lower Silurian shale of the lower Yangtze area originates from hydrothermal activity that can enhance the reducibility of the bottom water and carry nutrients from the crust to improve paleoproductivity and enrich sedimentary organic matter. Therefore, for the upper Ordovician-lower Silurian shale in the lower Yangtze region, exploration should be conducted in the blocks near the junction of the two plates where hydrothermal activity was active.

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