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An enigmatic piece of amber in the Oligocene of the Assam-Arakan Basin (Eastern India)

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Title An enigmatic piece of amber in the Oligocene of the Assam-Arakan Basin (Eastern India)
 
Creator GIRARD, V
SALPETEUR, I
DUTTA, S
BAUER, H
RAJU, SV
 
Subject CRETACEOUS AMBER
FOSSIL
FRANCE
CLASSIFICATION
INSECTS
RESINS
PLANTS
MICROORGANISMS
INCLUSIONS
SEDIMENTS
Taphonomy
Metamorphism
Amber preservation
Oil shale
Makum coal field
Assam-Arakan Basin
Oligocene Barail Group
 
Description Oil shale investigations in eastern India led to the discovery of an amber-filled vein within a rock that suffered sub-anchimetamorphic conditions whilst this material has never been found elsewhere than in low-grade diagenetic rocks. This discovery questions amber resistance to the increase of temperature and pressure. Our investigations indicate that a solid resin and incompletely polymerised amber are able to melt at a temperature of about 100-150 degrees C. It appears that the studied amber nodule melts during the increase of the diagenetic grade. Chemical analysis demonstrates that such event do not modify the chemical signature of the amber and microstructure shows that cooling was probably slow, allowing the acquirement of microstructure similar to a normal amber piece excepted the high abundance of minute pyrite crystals. (C) 2015 Elsevier Masson SAS. All rights reserved.
 
Publisher ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
 
Date 2016-01-14T13:48:13Z
2016-01-14T13:48:13Z
2015
 
Type Article
 
Identifier GEOBIOS, 48(1)1-8
0016-6995
1777-5728
http://dx.doi.org/10.1016/j.geobios.2014.12.001
http://dspace.library.iitb.ac.in/jspui/handle/100/17654
 
Language en