Continental break-up history of a deep magma-poor margin based on seismic reflection data (northeastern Gulf of Aden margin, offshore Oman)

被引:85
作者
Autin, Julia [1 ]
Leroy, Sylvie [1 ,2 ]
Beslier, Marie-Odile [3 ]
d'Acremont, Elia [1 ]
Razin, Philippe [4 ]
Ribodetti, Alessandra [3 ]
Bellahsen, Nicolas [1 ]
Robin, Cecile [5 ]
Al Toubi, Khalfan [6 ]
机构
[1] Univ Paris 06, UPMC, ISTeP, UMR 7193, F-75252 Paris 05, France
[2] CNRS, ISTeP, UMR 7193, F-75252 Paris 05, France
[3] OOV, CNRS Geosci Azur UMR 6526, F-06235 Villefranche Sur Mer, France
[4] Univ Bordeaux 3, EGID, F-33607 Pessac, France
[5] Univ Rennes 1, F-35042 Rennes, France
[6] Sultan Qaboos Univ, Earthquake Monitoring Ctr, Muscat, Oman
关键词
Continental margins: divergent; Kinematics of crustal and mantle deformation; Submarine landslides; Submarine tectonics and volcanism; Crustal structure; SOMALIA PLATE BOUNDARY; NON-VOLCANIC MARGINS; EASTERN GULF; PASSIVE MARGIN; RIFTED MARGINS; WESTERN GULF; GRAVITY-DATA; EVOLUTION; EXTENSION; MANTLE;
D O I
10.1111/j.1365-246X.2009.04424.x
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
070403 [天体物理学]; 070902 [地球化学];
摘要
Rifting between Arabia and Somalia started around 35 Ma followed by spreading at 17.6 Ma in the eastern part of the Gulf of Aden. The first-order segment between Alula-Fartak and Socotra-Hadbeen fracture zones is divided into three second-order segments with different structure and morphology. Seismic reflection data were collected during the Encens Cruise in 2006 on the northeastern margin. In this study, we present the results of Pre-Stack Depth Migration of the multichannel seismic data from the western segment, which allows us to propose a tectono-stratigraphic model of the evolution of this segment of the margin from rifting to the present day. The chronological interpretation of the sedimentary sequences is mapped out within relation to the onshore observations and existing dating. After a major development of syn-rift grabens and horsts, the deformation localized where the crust is the thinnest. This deformation occurred in the distal margin graben (DIM) at the northern boundary of the ocean-continent transition (OCT) represented by the OCT ridge. At the onset of the OCT formation differential uplift induced a submarine landslide on top of the deepest tilted block and the crustal deformation was restricted to the southern part of the DIM graben, where the continental break-up finally occurred. Initial seafloor spreading was followed by post-rift magmatic events (flows, sills and volcano-sedimentary wedge), whose timing is constrained by the analysis of the sedimentary cover of the OCT ridge, correlated with onshore stratigraphy. The OCT ridge may represent exhumed serpentinized mantle intruded by post-rift magmatic material, which modified the OCT after its emplacement.
引用
收藏
页码:501 / 519
页数:19
相关论文
共 88 条
[1]
AGUDELO W, 2005, THESIS U PARIS 6 FRA
[2]
Al-Yahya K., 1987, THESIS STANFORD U
[3]
WIDTH OF CONTINENTAL RIFTS AND RHEOLOGICAL LAYERING OF THE LITHOSPHERE [J].
ALLEMAND, P ;
BRUN, JP .
TECTONOPHYSICS, 1991, 188 (1-2) :63-69
[4]
[Anonymous], 1996, P ODP SCI RESULTS, DOI DOI 10.2973/0DP.PR0C.SR.149.218.1996
[5]
Fault reactivation and rift localization: Northeastern Gulf of Aden margin [J].
Bellahsen, N ;
Fournier, M ;
d'Acremont, E ;
Leroy, S ;
Daniel, JM .
TECTONICS, 2006, 25 (01)
[6]
TECTONIC DENUDATION OF THE UPPER MANTLE ALONG PASSIVE MARGINS - A MODEL BASED ON DRILLING RESULTS (ODP LEG-103, WESTERN GALICIA MARGIN, SPAIN) [J].
BOILLOT, G ;
RECQ, M ;
WINTERER, EL ;
MEYER, AW ;
APPLEGATE, J ;
BALTUCK, M ;
BERGEN, JA ;
COMAS, MC ;
DAVIES, TA ;
DUNHAM, K ;
EVANS, CA ;
GIRARDEAU, J ;
GOLDBERG, G ;
HAGGERTY, J ;
JANSA, LF ;
JOHNSON, JA ;
KASAHARA, J ;
LOREAU, JP ;
LUNASIERRA, E ;
MOULLADE, M ;
OGG, J ;
SARTI, M ;
THUROW, J ;
WILLIAMSON, M .
TECTONOPHYSICS, 1987, 132 (04) :335-342
[7]
BOILLOT G, 1995, NATO ADV SCI INST SE, V463, P219
[8]
THE TECTONIC FRAMEWORK AND REGIONAL HYDROCARBON PROSPECTIVITY OF THE GULF OF ADEN [J].
BOTT, WF ;
SMITH, BA ;
OAKES, G ;
SIKANDER, AH ;
IBRAHAM, AI .
JOURNAL OF PETROLEUM GEOLOGY, 1992, 15 (02) :211-243
[9]
Mantle exhumation at passive margins [J].
Brun, JP ;
Beslier, MO .
EARTH AND PLANETARY SCIENCE LETTERS, 1996, 142 (1-2) :161-173
[10]
Deep structure of the ocean-continent transition in the southern Iberia Abyssal Plain from seismic refraction profiles: Ocean Drilling Program (Legs 149 and 173) transect [J].
Chian, DP ;
Louden, KE ;
Minshull, TA ;
Whitmarsh, RB .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 1999, 104 (B4) :7443-7462