Effects of contact metamorphism on the lithium content and isotopic composition of kerogen in coal

显微组分 惰质 地质学 镜质组 地球化学 锂铁矿 干酪根 矿物学 长英质 变质作用 镁铁质 岩相学 烃源岩 沉积岩 化学 地貌学 有机化学 构造盆地
作者
Zebadiah Teichert,Cortland F. Eble,Maitrayee Bose,Lynda B. Williams
出处
期刊:Chemical Geology [Elsevier BV]
卷期号:602: 120885-120885
标识
DOI:10.1016/j.chemgeo.2022.120885
摘要

Lithium isotopes (δ 7 Li) in coals have been shown to increase with thermal maturity, suggesting preferential release of 6 Li from kerogen to porefluids. This has important implications for paleoclimate studies based on δ 7 Li of buried marine carbonates, which may incorporate Li from porefluids during recrystallization. Here, the Li content and isotopic composition of macerals from two coal seams intruded by dikes, were studied as a function of temperature across a thermal gradient into the unmetamorphosed coal. Samples were collected in Colorado (USA) from a Vermejo Fm. coal seam intruded by a mafic-lamprophyre dike and compared to a Dutch Creek No.2 coal seam intruded by felsic-porphyry dike; a potential source of Li-rich fluids. The Li-content and Li-isotope compositions of coal macerals were measured in situ by Secondary Ion Mass Spectrometry (SIMS). The macerals of the Vermejo coal samples, buried to VR o 0.68% (T max = 104 °C), contained <1.5 μg/g Li with an average vitrinite δ 7 Li of −28.4 ± 1.6‰, while liptinite and inertinite were heavier, averaging −15.4 ± 3.6‰ and − 10.5 ± 3.7‰, respectively. The contact metamorphosed vitrinite/coke showed the greatest change with temperature with δ 7 Li 18 to 37‰ heavier than the unmetamorphosed vitrinite. The Dutch Creek coal, buried to VRo 1.15% (T max = 147 °C), prior to dike emplacement, may have released Li during burial, as less isotopic change was observed between contact metamorphosed and unmetamorphosed macerals. Overall, Li contents were < 1 μg/g, and the vitrinite in metamorphosed coal had δ 7 Li values 8 to 21‰ heavier than the unmetamorphosed coal. SIMS measurements on macerals near the dike did not show an increase in Li-content indicative of Li derived from dike fluids, however previous bulk measurements that included silicates showed slightly higher (2-3 μg/g) Li-contents near the dike, suggesting possible Li incorporation from dike fluid into metamorphic silicates. A negative correlation was observed between Li-content and 12 C + / 30 Si + count ratios, indicating that at metamorphic temperatures Li becomes concentrated in silicates.
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