Organic Geochemistry of the Paleocene-Eocene Oil Shales of the Gongjue Formation, Nangqian Basin, East-Central Tibetan Plateau

Qi, Zhaolin; Li, Y; Wang, C; Sun, Tao; Zhang, J

doi:10.3176/oil.2017.1.01

Cited by 6 publications

(6 citation statements)

References 24 publications

(26 reference statements)

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“…It is a lacustrine-dominated Cenozoic sedimentary basin on the eastern-central Tibetan Plateau near the headwaters of the Zha Qu/Lancangjiang River (also called the Mekong River in Thailand) with an average elevation of over 4000 m [50]. This NW-SE elongated basin is approximately 55 km long and 18 km wide [51] and is situated in the central part of the Qiangtang terrane [50].…”

Section: Geology and Tectonic Settingmentioning

confidence: 99%

“…The Nangqen Basin is a typical shearing-extensional basin [1] situated in the hinterland of the Tibetan Plateau [50] and is very similar to the adjacent Dengqen and Baxoi Basins [49]. It is a lacustrine-dominated Cenozoic sedimentary basin on the eastern-central Tibetan Plateau near the headwaters of the Zha Qu/Lancangjiang River (also called the Mekong River in Thailand) with an average elevation of over 4000 m [50].…”

Section: Geology and Tectonic Settingmentioning

confidence: 99%

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Origin of Boron and Brine Evolution in Saline Springs in the Nangqen Basin, Southern Tibetan Plateau

Han

Hussain

et al. 2018

Geofluids

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The Nangqen Basin is a typical shearing-extensional basin situated in the hinterland of the Tibetan Plateau. It contains abundant saline spring resources and abnormal trace element enrichments. The hydrochemical molar ratios (Na/Cl, B/Cl, and Br/Cl), H-O isotopes, and B isotopes of the saline spring were systematically measured to describe the evolution of brines and the origin of the boron. The sodium chloride coefficient of the water samples in this area is around 1.0 or slightly greater, which is characteristic of leached brines; the highest B/Cl value is 4.25 (greater than that of seawater). The Na/Cl, B/Cl, and Br/Cl values of the springs are clear indicators of a crustal origin. The18 O values of the spring waters range from −12.88‰ to −16.05‰, and the D values range from −100.91‰ to −132.98‰. Meanwhile the B content and B isotopes in the saline springs are in the ranges of 1.00 to 575.56 ppm and +3.55‰ to +29.59‰, respectively. It has been proven that the saline springs in the Nangqen Basin are a type of leached brine, suggesting that the saline springs have a terrestrial origin. The 11 B-B characteristics of the springs are similar to those observed in the Tibetan geothermal area, indicating that these two places have the same B source. Moreover, they have a crustal origin (marine carbonate rocks and volcanic rocks) instead of a deep mantle source.

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Section: Geology and Tectonic Settingmentioning

confidence: 99%

Section: Geology and Tectonic Settingmentioning

confidence: 99%

Origin of Boron and Brine Evolution in Saline Springs in the Nangqen Basin, Southern Tibetan Plateau

Han

Hussain

et al. 2018

Geofluids

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“…It is a Tertiary inland basin, formed by the collision of the Eurasian and Indian plates. The long-term uplift and denudation of the Mesozoic basement has also contributed to the formation of the basin (Deng et al 2000;Qi et al 2017). As shown in figure 1, the exposed surface layers are relatively limited to the Mesoproterozoic, Carboniferous, Permian, Triassic, Palaeogene, Neogene and Quaternary.…”

Section: Geology and Tectonic Settingmentioning

confidence: 99%

Stable chlorine isotopes in saline springs from the Nangqen basin, Qinghai–Tibet Plateau: Brine genesis and evolution

2019

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Chlorine isotopes can be used to study the evolution of different fluids, sources and the causes of various related deposits. In this study, Cl concentrations and chlorine isotope (d 37 Cl, IAEA ISL-354 NaCl standard) values were determined for brine samples from Nangqen basin, located on the southern boundary of the Qinghai-Tibet plateau to study the source and the processes of these saline springs. The results demonstrated that the saline springs are distributed around a fault or fault zone, with a high average salinity of 228.30 g/l and flow rates ranging from 1.7 to 0.01 l/s. Na + and Cl À are the predominant cations and anions, respectively, accounting for more than 90% of the total. The d 37 Cl values range from À1.55% to +0.97%, and the Cl/Br ratios are from 1739 to 175,260. Coupled with the previous H, O and B isotope compositions (dD, VSMOW2 standard, ranges from À100.91% to À132.98%, d 18 O, VSMOW2 standard, from À12.88% to À16.05% and d 11 B, NIST 951 standard, from +3.55% to +29.59%), it can be interpreted that the saline springs are mainly the result of the dissolution of halite hosted in mudstone and volcanic country rocks.

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“…Typically, regular steranes are derived from sterols, known as constituents of the cell membranes in all eukaryotes. Algae are believed to be the predominant primary producers of C 27 sterols, while C 29 sterols are more typically associated with land plants [32][33][34][35]. However, C 28 steranes are suggested to be derived from phytoplankton and zooplankton.…”

Section: Organic Matter Inputmentioning

confidence: 99%

Sedimentary and Geochemical Characteristics of Oil Shale in the Permian Lucaogou Formation in the Southeastern Junggar Basin, Northwest China: Implications for Sedimentary Environments

Zhang¹,

Li²,

Yin³

2018

Oil Shale

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In this study, the sedimentary and geochemical characteristics of oil shale in the Lower and the Upper Member of the Permian Lucaogou Formation in the southeastern Junggar Basin, Northwest China, were investigated. Mineral and bulk chemical compositions, sedimentary facies and distribution of oil shale show that in the Lower Member it is rich in organic matter, but in the Upper Member, organic-poor. The distribution area of deep lake subfacies and oil shale in the Lower Member is larger than that in the Upper Member. The sedimentary modes of these two members were estimated using geochemical parameters, such as Sr/Cu, the chemical index of alteration (CIA), Ni/Co, V/Sc and (C 27 + C 28)/C 29 regular steranes. The organic-rich oil shale in the Lower Member of the Lucaogou Formation formed in the more humid climate and under oxidative conditions, its organic matter derived mainly from algae. On the other hand, the organic-poor oil shale in the formation's Upper Member formed in the humid climate and under more oxidative conditions, while the input of land plants to its organic matter was high and that of algae low.

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Organic Geochemistry of the Paleocene-Eocene Oil Shales of the Gongjue Formation, Nangqian Basin, East-Central Tibetan Plateau

Cited by 6 publications

References 24 publications

Origin of Boron and Brine Evolution in Saline Springs in the Nangqen Basin, Southern Tibetan Plateau

Origin of Boron and Brine Evolution in Saline Springs in the Nangqen Basin, Southern Tibetan Plateau

Stable chlorine isotopes in saline springs from the Nangqen basin, Qinghai–Tibet Plateau: Brine genesis and evolution

Sedimentary and Geochemical Characteristics of Oil Shale in the Permian Lucaogou Formation in the Southeastern Junggar Basin, Northwest China: Implications for Sedimentary Environments

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