Fossilisation of a silica diagenesis reaction front on the mid-Norwegian margin

Neagu, Raluca Cristina, Cartwright, Joseph Albert, Davies, Richard and Jensen, Lars 2010. Fossilisation of a silica diagenesis reaction front on the mid-Norwegian margin. Marine and Petroleum Geology 27 (10) , pp. 2141-2155. 10.1016/j.marpetgeo.2010.09.003

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Abstract

The diagenetic transformation of biogenic silica from opal-A to opal-CT was recognised on seismic reflection data over an area of 78 × 103 km2 on the mid-Norwegian margin. The opal-A/CT diagenetic boundary appears as a positive, high amplitude reflection that generally cross-cuts the hosting stratigraphy. We demonstrate that it is not a sea bottom simulating reflection (BSR) and also that is not in thermal equilibrium with the present day isotherms. We present arguments that three styles of deformation associated with the opal-A/CT reflection – polygonal faulting, regional anticlines and synclines and differential compaction folding – indicate that the silica diagenesis reaction front is fossilised at a regional scale. Isochore maps demonstrate the degree of conformity between the opal-A/CT reflection and three seismic horizons of Late Miocene to Early Pliocene age that potentially represent the paleo-seabed when ‘fossilisation’ of the reaction front took place. The seismic interpretational criteria for recognition of a fossilised diagenetic front are evaluated and the results of our study are integrated with previous studies from other basins of the NE Atlantic in order to determine if the arrest of silica diagenesis was diachronous along this continental margin.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Subjects:	G Geography. Anthropology. Recreation > GC Oceanography Q Science > QE Geology
Uncontrolled Keywords:	Opal-A; Opal-CT; Silica diagenesis; Polygonal faulting; Differential compaction; Isochore maps; Vøring Basin; Møre Basin
Publisher:	Elsevier
ISSN:	0264-8172
Last Modified:	28 Jun 2019 02:15
URI:	https://orca.cardiff.ac.uk/id/eprint/12377

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