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Albian syndepositional block rotation and its geological consequences, Basque–Cantabrian Basin (western Pyrenees)

Published online by Cambridge University Press:  02 May 2013

LUIS MIGUEL AGIRREZABALA  and
JAUME DINARÈS-TURELL
LUIS MIGUEL AGIRREZABALA*
Affiliation:
Estratigrafia eta Paleontologia Saila, Euskal Herriko Unibertsitatea UPV/EHU, 644 PK, 48080 Bilbo, Spain
JAUME DINARÈS-TURELL
Affiliation:
Istituto Nazionale di Geofisica e Vulcanologia. Via di Vigna Murata 605, 00143 Roma, Italy
*
†Author for correspondence: l.agirrezabala@ehu.es
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Abstract

Stratigraphic, structural, palaeocurrent and palaeomagnetic analyses of Upper Albian deep-water deposits in and around the Deba block (Northern Iberia) are presented. Results indicate an anticlockwise vertical-axis rotation of this block by 35° during a maximum time span of c. 1 Ma (Late Albian intra-C. auritus ammonite Subzone). This Albian syndepositional block rotation is interpreted to be the consequence of the coeval activity of conjugate major sinistral strike-slip faults and minor (antithetic) dextral strike-slip faults, which border the Deba block. On the base of conservative estimations, a minimum block-rotation rate of 35° Ma−1 and a sinistral strike-slip rate of 1.2 km Ma−1 are calculated. As a consequence of the interaction of the rotated Deba block with adjacent non-rotated blocks, its corners experienced coeval transpressive (NW and SE corners) and transtensional deformations (SW and, possibly, NE corners). At the transtensional SW corner, two domal high-reflective seismic structures have been recorded and interpreted as high-level magmatic laccoliths. These magmatic intrusions triggered the development of a mineralizing hydrothermal system, which vented to the Late Albian seafloor warm to hot hydrocarbon-rich fluids. Vented hydrocarbon was generated from Albian organic-rich sediments by contact alteration with hydrothermal fluids.

Keywords

block rotationpalaeocurrentpalaeomagnetismAlbianBasque–Cantabrian Basin

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Type
Original Articles
Information
Geological Magazine , Volume 150 , Issue 6 , November 2013 , pp. 986 - 1001
Copyright
Copyright © Cambridge University Press 2013 

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