Trace elements geochemistry of kerogen in Upper Cretaceous sediments, Chad (Bornu) Basin, northeastern Nigeria: Origin and paleo-redox conditions

被引:44
作者
Adegoke, Adebanji Kayode [1 ,2 ]
Abdullah, Wan Hasiah [1 ]
Hakimi, Mohammed Hail [3 ]
Yandoka, Babangida M. Sarki [1 ,4 ]
Mustapha, Khairul Azlan [1 ]
Aturamu, Adeyinka Oluyemi [2 ,5 ]
机构
[1] Univ Malaya, Dept Geol, Kuala Lumpur 50603, Malaysia
[2] Ekiti State Univ, Fac Sci, Dept Geol, Ado Ekiti, Nigeria
[3] Taiz Univ, Fac Sci Appl, Dept Geol, Taizi 6803, Yemen
[4] ATBU, Natl Ctr Petr Res & Dev, Bauchi, Nigeria
[5] Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England
关键词
Trace elements; Kerogen; Dysoxic; Paleo-redox; Upper Cretaceous; Chad (Bornu) Basin; LA LUNA FORMATION; RIFT BASINS; ORGANIC GEOCHEMISTRY; PETROLEUM GEOLOGY; BENUE TROUGH; SOURCE ROCKS; SOUTH CHINA; MOLYBDENUM; SHALES; ENVIRONMENT;
D O I
10.1016/j.jafrearsci.2014.08.014
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Trace element contents in isolated kerogen from Upper Cretaceous sediments within Gongila and Fika formations in the Chad (Bornu) Basin, northeastern Nigeria were determined using Inductively-coupled plasma mass spectrometer (ICP-MS), in order to infer the origin of the organic matter and the paleo-redox conditions during their sedimentation. The concentrations of the elements in the kerogen samples varied from 1.01 to 24,740 ppm. The distribution of elements shows that Fe is the most abundant element in Chad (Bornu) Basin kerogen, followed by Ce. Among the biophile elements, V is the most abundant, followed by Ni and Co in that order. Statistical evaluation of the elemental composition data shows that As, Ce, Pb, V, Cr, Fe, Co, Ni and U exhibit good positive correlations with each other. Molybdenum, on the other hand displays no obvious correlation with most of the trace elements determined including TOC, but has good positive correlation with TS and negative correlation with Tmax, Ce and Th, which suggests that the concentration of Mo decreases with increasing maturity and vice versa. Some trace element concentrations and their ratios suggest mixed marine and terrigenous source input for the organic matter (kerogen) in Chad (Bornu) Basin. More so, the concentrations of redox-sensitive elements, such as V, Ni, Cu, Cr Mo and Mn, in the kerogen samples suggest dysoxic bottom water conditions within the Gongila and Fika sediments. Cross-plots of V and Ni and V/(V + Ni) ratio also indicate that the organic matter of these samples was deposited in slightly reducing environments. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:675 / 683
页数:9
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