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17 results on '"Bian, Leibo"'

14. Molybdenum-uranium-vanadium geochemistry in the lower Paleozoic Alum Shale of Scandinavia:Implications for vanadium exploration

Author

Bian, Leibo, Schovsbo, Niels H., Chappaz, Anthony, Zheng, Xiaowei, Nielsen, Arne Thorshoj, Ulrich, Thomas, Wang, Xibo, Dai, Shifeng, Galloway, Jennifer M., Malachowska, Aleksandra, Xu, Xuhui, Sanei, Hamed, Bian, Leibo, Schovsbo, Niels H., Chappaz, Anthony, Zheng, Xiaowei, Nielsen, Arne Thorshoj, Ulrich, Thomas, Wang, Xibo, Dai, Shifeng, Galloway, Jennifer M., Malachowska, Aleksandra, Xu, Xuhui, and Sanei, Hamed

Abstract

This paper investigates the hyper-enrichments of molybdenum (Mo), uranium (U), and vanadium (V) in the lower Paleozoic, Alum Shale of Denmark, Sweden, Norway, and Estonia. Molybdenum and U are mainly associated with organic matter and the highest contents are found in the Furongian part of the Alum Shale. This Furongian hyper-enrichment of Mo and U commenced with the Steptoean Positive Carbon Isotope Excursion (SPICE) event. The temporal distribution of V content increases moderately from the Miaolingian to the Furongian, followed by a significant increase in the Early Ordovician. In addition, the vanadium content generally increases towards the offshore, distal part of the Alum Shale basin. The geochemical affinity of V seems to change from organic matter in the Cambrian to minerals in the Early Ordovician. The hyper-enrichment of V in the Lower Ordovician succession appears to result from upwelling of deep oceanic water. The spatial distribution of V in the Alum Shale indicates that the highest concentrations are located in Scania, southernmost Sweden.

Published
2021

17. Influence of Thermal Intrusion on Solid Bitumen in the Alum Shale, Central Sweden.

Author

Liu, Anji, Sanei, Hamed, Schovsbo, Niels H., Xiaowei Zheng, and Bian, Leibo

Subjects
BITUMEN, APATITE, LIMESTONE, HYDROCARBONS, STATISTICAL hypothesis testing
Abstract

This study investigates the geochemical and petrological characteristics of solid bitumen in the DBH 15/73 core from the Furongian (upper Cambrian) and Miaolingian (middle Cambrian) Alum Shale in central Sweden. The shale here was intruded by Permo-Carboniferous diabase approximately 100 m above. The results show that the solid bitumen in DBH samples could be classified as follows: bituminite, diagenetic solid bitumen (DSB), initial-oil solid bitumen (IOSB), primary-oil solid bitumen (POSB) and solid bitumen inside apatite nodules based on their morphology and random solid bitumen reflectance (BR0). The immature Miaolingian shale contains bituminite and DSB, with measured BR0 ranging from 0.40% to 0.48%. The Furongian shale is enriched with IOSB and POSB indicating a maturity gradient from marginally mature to peak oil generation from the bottom to the top stratigraphically. The IOSB (BRo: 0.54-1.08%) exhibits characteristics of uneven heating such as oxidation rim, melted maceral, abnormal maturity around fractures. In addition. POSB (BR0: 0.63-2.01%) displays flow structures, and its migration is evidenced by its occurrence in the overlying organic-poor Ordovician Lanna limestone and the underlying Kakeled Limestone Bed. The sum of POSB and IOSB is determined through maceral point counting. We suggest that POSB is the main bitumen type (1.54-7.13 vol.%) and IOSB is the minority (0.05-0.31 vol.%) in the Furongian shale indicating rapid thermal evolution of the organic matter within the oil generation window. The free hydrocarbon (Rock-Eval SI) and Tmax anomalies are observed in Furongian shale. We hypothesis that the migration of POSB and generated oil results in a decrease of free hydrocarbon (SI). The low Tmax value appears to be a result of microbially mediated oxidation and high uranium content, leading to an underestimation of thermal maturity and kerogen conversion. [ABSTRACT FROM AUTHOR]

Published
2023

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