The occurrence and significance of C25HBI in Cenozoic saline lacustrine source rocks from the Western Qaidam Basin, NW China

The saline lacustrine deposit of the Oligocene Lower Ganchaigou Formation is the main source rock for the Western Qaidam Basin, NW China. In this study, abundant highly branched isoprenoids with 25 carbon atoms （C25HBI） were detected in the upper section of the Lower Ganchaigou Formation. C25HBI is...

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Published inChinese science bulletin Vol. 56; no. 13; pp. 1390 - 1398
Main Authors Zhang, YongDong, Sun, YongGe, Xie, LiuJuan, Jiang, AiZhu, Chai, PingXia
Format Journal Article
LanguageEnglish
Published Heidelberg Springer-Verlag 01.05.2011
SP Science China Press
Subjects
alkanes
Bacillariophyceae
carbon
carbon dioxide
Chemistry/Food Science
dissolved carbon dioxide
Earth Sciences
Engineering
Humanities and Social Sciences
isoprenoids
Life Sciences
multidisciplinary
organic matter
Physics
primary productivity
rocks
Science
Science (multidisciplinary)
trophic relationships
下干柴沟组
中国西北
新生代
柴达木盆地西部
沉积有机质
湖相烃源岩
生物地球化学过程
盐水湖
China
alkanes
C
diatoms
high carbon number
molecular stable carbon isotopic composition
Qaidam Basin
HBI
Online AccessGet full text
ISSN1001-6538
1861-9541
1861-9541
DOI10.1007/s11434-011-4430-2

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Abstract The saline lacustrine deposit of the Oligocene Lower Ganchaigou Formation is the main source rock for the Western Qaidam Basin, NW China. In this study, abundant highly branched isoprenoids with 25 carbon atoms （C25HBI） were detected in the upper section of the Lower Ganchaigou Formation. C25HBI is a biomarker for diatoms, and can provide information regarding biogeochemical processes during production and preservation of sedimentary organic matter. The carbon isotopic values of C25HBI in these source rocks were in the range of-18%o to -20%0. The relative enrichment in ^13C of C25HBI suggests that these isoprenoids were derived from diatom blooms. In this case, the diatoms used HCO3^- as an additional carbon source to dissolved CO2 in water column due to their high biological productivity. Conversely, the diatom blooms indicated an abundant nutrient supply to the environment and high primary productivity. Thus, the occurrence of ^13C-enriched C25HBI could be an ideal marker for good source rocks. The decreased concentration of CO2 （aq） in the water column induced by diatom blooms can result in an enrichment in ^13C of organic matter synthesized by primary producers. This may be a possible reason for the occurrence of ^13C-enriched organic matter in the Cenozoic source rocks of the Western Qaidam Basin. Previous studies have shown that the high carbon number n-alkanes sourced from diatoms have no carbon preference. Hence, the sources of n-alkanes in regional source rocks are complex, and should be considered when discussing the sources of organic matter in future studies.
AbstractList The saline lacustrine deposit of the Oligocene Lower Ganchaigou Formation is the main source rock for the Western Qaidam Basin, NW China. In this study, abundant highly branched isoprenoids with 25 carbon atoms (C25HBI) were detected in the upper section of the Lower Ganchaigou Formation. C25HB delta is a biomarker for diatoms, and can provide information regarding biogeochemical processes during production and preservation of sedimentary organic matter. The carbon isotopic values of C25HB delta in these source rocks were in the range of -18 to -20. The relative enrichment in 13C of C25HBI suggests that these isoprenoids were derived from diatom blooms. In this case, the diatoms used HCO3 - as an additional carbon source to dissolved CO2 in water column due to their high biological productivity. Conversely, the diatom blooms indicated an abundant nutrient supply to the environment and high primary productivity. Thus, the occurrence of 13C-enriched C25HB delta could be an ideal marker for good source rocks. The decreased concentration of CO2 (aq) in the water column induced by diatom blooms can result in an enrichment in 13C of organic matter synthesized by primary producers. This may be a possible reason for the occurrence of 13C-enriched organic matter in the Cenozoic source rocks of the Western Qaidam Basin. Previous studies have shown that the high carbon number n-alkanes sourced from diatoms have no carbon preference. Hence, the sources of n-alkanes in regional source rocks are complex, and should be considered when discussing the sources of organic matter in future studies.
The saline lacustrine deposit of the Oligocene Lower Ganchaigou Formation is the main source rock for the Western Qaidam Basin, NW China. In this study, abundant highly branched isoprenoids with 25 carbon atoms （C25HBI） were detected in the upper section of the Lower Ganchaigou Formation. C25HBI is a biomarker for diatoms, and can provide information regarding biogeochemical processes during production and preservation of sedimentary organic matter. The carbon isotopic values of C25HBI in these source rocks were in the range of-18%o to -20%0. The relative enrichment in ^13C of C25HBI suggests that these isoprenoids were derived from diatom blooms. In this case, the diatoms used HCO3^- as an additional carbon source to dissolved CO2 in water column due to their high biological productivity. Conversely, the diatom blooms indicated an abundant nutrient supply to the environment and high primary productivity. Thus, the occurrence of ^13C-enriched C25HBI could be an ideal marker for good source rocks. The decreased concentration of CO2 （aq） in the water column induced by diatom blooms can result in an enrichment in ^13C of organic matter synthesized by primary producers. This may be a possible reason for the occurrence of ^13C-enriched organic matter in the Cenozoic source rocks of the Western Qaidam Basin. Previous studies have shown that the high carbon number n-alkanes sourced from diatoms have no carbon preference. Hence, the sources of n-alkanes in regional source rocks are complex, and should be considered when discussing the sources of organic matter in future studies.
The saline lacustrine deposit of the Oligocene Lower Ganchaigou Formation is the main source rock for the Western Qaidam Basin, NW China. In this study, abundant highly branched isoprenoids with 25 carbon atoms (C 25 HBI) were detected in the upper section of the Lower Ganchaigou Formation. C 25 HBI is a biomarker for diatoms, and can provide information regarding biogeochemical processes during production and preservation of sedimentary organic matter. The carbon isotopic values of C 25 HBI in these source rocks were in the range of −18‰ to −20‰. The relative enrichment in 13 C of C 25 HBI suggests that these isoprenoids were derived from diatom blooms. In this case, the diatoms used HCO 3 − as an additional carbon source to dissolved CO 2 in water column due to their high biological productivity. Conversely, the diatom blooms indicated an abundant nutrient supply to the environment and high primary productivity. Thus, the occurrence of 13 C-enriched C 25 HBI could be an ideal marker for good source rocks. The decreased concentration of CO 2 (aq) in the water column induced by diatom blooms can result in an enrichment in 13 C of organic matter synthesized by primary producers. This may be a possible reason for the occurrence of 13 C-enriched organic matter in the Cenozoic source rocks of the Western Qaidam Basin. Previous studies have shown that the high carbon number n -alkanes sourced from diatoms have no carbon preference. Hence, the sources of n -alkanes in regional source rocks are complex, and should be considered when discussing the sources of organic matter in future studies.
The saline lacustrine deposit of the Oligocene Lower Ganchaigou Formation is the main source rock for the Western Qaidam Basin, NW China. In this study, abundant highly branched isoprenoids with 25 carbon atoms (C25HBI) were detected in the upper section of the Lower Ganchaigou Formation. C25HBI is a biomarker for diatoms, and can provide information regarding biogeochemical processes during production and preservation of sedimentary organic matter. The carbon isotopic values of C25HBI in these source rocks were in the range of −18‰ to −20‰. The relative enrichment in 13C of C25HBI suggests that these isoprenoids were derived from diatom blooms. In this case, the diatoms used HCO3 − as an additional carbon source to dissolved CO2 in water column due to their high biological productivity. Conversely, the diatom blooms indicated an abundant nutrient supply to the environment and high primary productivity. Thus, the occurrence of 13C-enriched C25HBI could be an ideal marker for good source rocks. The decreased concentration of CO2 (aq) in the water column induced by diatom blooms can result in an enrichment in 13C of organic matter synthesized by primary producers. This may be a possible reason for the occurrence of 13C-enriched organic matter in the Cenozoic source rocks of the Western Qaidam Basin. Previous studies have shown that the high carbon number n-alkanes sourced from diatoms have no carbon preference. Hence, the sources of n-alkanes in regional source rocks are complex, and should be considered when discussing the sources of organic matter in future studies.
Author Xie, LiuJuan
Zhang, YongDong
Sun, YongGe
Jiang, AiZhu
Chai, PingXia
AuthorAffiliation State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 China Department of Earth Science, Zhejiang University, Hangzhou 310027, China Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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Keywords alkanes
C
diatoms
high carbon number
molecular stable carbon isotopic composition
Qaidam Basin
HBI
Language English
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Notes C2sHBI, diatoms, high carbon number n-alkanes, molecular stable carbon isotopic composition, Qaidam Basin
11-1785/N
The saline lacustrine deposit of the Oligocene Lower Ganchaigou Formation is the main source rock for the Western Qaidam Basin, NW China. In this study, abundant highly branched isoprenoids with 25 carbon atoms （C25HBI） were detected in the upper section of the Lower Ganchaigou Formation. C25HBI is a biomarker for diatoms, and can provide information regarding biogeochemical processes during production and preservation of sedimentary organic matter. The carbon isotopic values of C25HBI in these source rocks were in the range of-18%o to -20%0. The relative enrichment in ^13C of C25HBI suggests that these isoprenoids were derived from diatom blooms. In this case, the diatoms used HCO3^- as an additional carbon source to dissolved CO2 in water column due to their high biological productivity. Conversely, the diatom blooms indicated an abundant nutrient supply to the environment and high primary productivity. Thus, the occurrence of ^13C-enriched C25HBI could be an ideal marker for good source rocks. The decreased concentration of CO2 （aq） in the water column induced by diatom blooms can result in an enrichment in ^13C of organic matter synthesized by primary producers. This may be a possible reason for the occurrence of ^13C-enriched organic matter in the Cenozoic source rocks of the Western Qaidam Basin. Previous studies have shown that the high carbon number n-alkanes sourced from diatoms have no carbon preference. Hence, the sources of n-alkanes in regional source rocks are complex, and should be considered when discussing the sources of organic matter in future studies.
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SSID ssj0013172
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Snippet The saline lacustrine deposit of the Oligocene Lower Ganchaigou Formation is the main source rock for the Western Qaidam Basin, NW China. In this study,...
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SubjectTerms alkanes
Bacillariophyceae
carbon
carbon dioxide
Chemistry/Food Science
dissolved carbon dioxide
Earth Sciences
Engineering
Humanities and Social Sciences
isoprenoids
Life Sciences
multidisciplinary
organic matter
Physics
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Title The occurrence and significance of C25HBI in Cenozoic saline lacustrine source rocks from the Western Qaidam Basin, NW China
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