期刊
MARINE AND PETROLEUM GEOLOGY
卷 61, 期 -, 页码 82-94出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2014.12.010
关键词
Geochemical characteristics; Lacustrine environment; Bima Formation; Northern Benue Trough
资金
- National Centre for Petroleum Research and Development
- Energy Commission of Nigeria
- University of Malaya, Malaysia [PG140-2012B]
The Bima Formation is the oldest lithogenetic unit occupying the base of the Cretaceous successions in the Yola Sub-basin of the Northern Benue Trough. It is differentiated into Lower (B1), Middle (B2) and Upper (B3) Bima Members. Integrated organic and inorganic geochemical studies were applied on the lacustrine sediments of the Bima Formation with the aim of reconstructing the palaeodepositional environment and organic matter input in response to climate and tectonism. The analysed sediments were deposited in a freshwater lacustrine environment with a low-salinity stratified water column and suboxic to relatively anoxic conditions, as indicated by the bulk geochemical parameters. The biomarkers provide evidence for a contribution of aquatic algae and microorganisms, with a significant amount of terrigenous organic matter input. The preservation of the organic matter is possibly attributed to the stratified water column with low salinity and suboxic to relatively anoxic conditions. Based on the geochemistry of major and trace elements, the sediments were deposited during semi-arid climatic conditions within passive continental margin setting. This agrees with the tectonic events in the West and Central African Rift System (WCARS) during the Early Cretaceous period. (C) 2014 Elsevier Ltd. All rights reserved.
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