Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1753945 | International Journal of Coal Geology | 2009 | 7 Pages |
Abstract
The terpenoid composition and class of Tertiary resins preserved within lignites of Cambay, Kutch and Cauvery Basins of India have been characterized using Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC-MS) and Fourier Transform Infrared (FTIR) Spectroscopy. Major pyrolysis products include cadalene-based C15-bicyclic sesquiterpenoids with some C30 and C31 bicadinanes and bicadinenes typical of Class II or dammar resin. The occurrence of these terpenoids in Early Eocene sediments may extend the first appearance of Dipterocarpaceae angiosperms, the predominant source of this resin class, back to the Early Eocene epoch in India. The same terpenoid biomarkers have been detected in many SE Asian oils reflecting a close source relationship with these resins. Strong CH3 (1377 cmâ 1) and other CHx (3000-2800 and 1460-1450 cmâ 1) aliphatic absorptions of much larger intensity than the aromatic C = C (1560-1650 cmâ 1) absorption were detected in the Indian resins by FTIR Spectroscopy, confirming the quantitative significance of the terpenoid pyrolysates.
Keywords
Related Topics
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Earth and Planetary Sciences
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Authors
Suryendu Dutta, Monalisa Mallick, Norbert Bertram, Paul F. Greenwood, Runcie Paul Mathews,