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Molecular composition and paleobotanical origin of Eocene resin from northeast India

DSpace at IIT Bombay

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Title Molecular composition and paleobotanical origin of Eocene resin from northeast India
 
Creator RUDRA, A
DUTTA, S
RAJU, SV
 
Subject Eocene
northeast India
resin chemistry
Dipterocarpaceae
WESTERN INDIA
FOSSIL
COALS
AMBER
IDENTIFICATION
GEOCHEMISTRY
HYDROCARBONS
MEGHALAYA
MIOCENE
BASINS
 
Description The molecular composition of fossil resins from early to middle Eocene coal from northeast India, has been analyzed for the first time to infer their paleobotanical source. The soluble component of fossil resin was analyzed using gas chromatography mass spectrometry (GC-MS). The resin extracts are composed of cadalene-based C-15 sesquiterpenoids and diagenetically altered triterpenoids. The macromolecular composition was investigated using pyrolysis gas chromatography-mass spectrometry (Py-GC MS) and Fourier transform infrared (FTIR) spectroscopy. The major pyrolysis products are C-15 bicyclic sesquiterpenoids, alkylated naphthalenes, benzenes and a series of C-17-C-34 n-alkene-n-alkane pairs. Spectroscopic analysis revealed the dominance of aliphatic components. The presence of cadalene-based sequiterpenoids confirms the resin to be Class II or dammar resin, derived from angiosperms of Dipterocarpaceae family. These sesquiterpenoids are often detected in many SE Asian fluvio-deltaic oils. Dipterocarpaceae are characteristic of warm tropical climate suggesting the prevalence of such climate during early Eocene in northeast India.
 
Publisher INDIAN ACAD SCIENCES
 
Date 2014-12-28T09:10:18Z
2014-12-28T09:10:18Z
2014
 
Type Article
 
Identifier JOURNAL OF EARTH SYSTEM SCIENCE, 123(5)935-941
0253-4126
0973-774X
http://dspace.library.iitb.ac.in/jspui/handle/100/16252
 
Language English