02540nab a2200229 4500 20260520000323.0 260224s2015 xxu ing Inglés Raman spectroscopic analysis of carbonaceous matter and silica in the test walls of recent and fossil agglutinated foraminifera jun. 2015 17/10/2017 ; 17/10/2017 16 p. ; 1081-1097 Transcripción del resumen del autor: Previous HitRamanNext Hit spectroscopy has been used extensively in thermal maturation studies of kerogen, but has not been used to examine the maturation of organic cements in agglutinated foraminifera. Here, we use Previous HitRamanNext Hit spectroscopy to document the existence of carbonaceous matter and silica in recent and fossil agglutinated foraminifera, and to measure thermal alteration effects in fossil foraminifera. The distribution of carbonaceous matter through the test (shell) walls of agglutinated foraminifera suggests that this carbonaceous material is derived from primary organic cement and not from random contamination. Fossil specimens exhibit three broad stages of maturation: (1) Immature specimens are characterized by moderately strong fluorescence, broad, low intensity Previous HitRamanNext Hit peaks (relative to fluorescence), and a tendency for the G-band to occur at lower wave numbers. These attributes are consistent with the presence of amorphous carbonaceous matter and minor organic degradation. (2) Mature samples (oil window) exhibit high fluorescence, increased relative D- and G-band intensities, and a decreased width of the D-band. (3) Postmature samples exhibit low levels of fluorescence and high relative D- and G-band intensities, a tendency for the G-band to be located at higher wave numbers, an increase in the D:G band ratio, and an increase of the relative intensity of the silica peak. This stage is consistent with the presence of highly ordered carbonaceous matter and diagenetic quartz. These findings indicate that Previous HitRamanNext Hit Previous HitspectroscopicTop analysis of fossil agglutinated foraminifera can be used as a quick and easy tool to assess thermal maturity and estimate optimal temperatures for hydrocarbon generation. 6 AAPG Bulletin ARTICULO McNeil, David H. 57369 Schulze, H. Georg 57370 Matys, Emily 57371 Bosak, Tanja 57372 191349 191349 0 0 0 0 259168 BAAB BAAB 2026-03-06 200063624 0 200063624 2026-03-06 00:21:55 2026-03-06 ARTICULO