Origin of the northern Indus Fan and Murray Ridge, Northern Arabian Sea: interpretation from seismic and magnetic imaging

Gaedicke, Christoph; Schlüter, Hans-Ulrich; Roeser, H. A.; Prexl, A.; Schreckenberger, Bernd; Meyer, H.; Reichert, Christian; Clift, Peter D.; Amjad, Shahid

doi:10.1016/s0040-1951(02)00137-3

Cited by 47 publications

(21 citation statements)

References 19 publications

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“…The U-unconformity does not have a tectonic origin, and simply reflects the transition from Oligocene pelagites to Lower Miocene turbidites as the substratum of the Owen Ridge gets progressively buried under the Indus deep-sea fan (Mountain and Prell, 1990;Shipboard Scientific Party, 1989). Therefore, the angular unconformity marking the main uplift of the Murray Ridge recognized by Gaedicke et al (2002a) (picked in blue on Fig. 3) is different from the U-unconformity recognized everywhere in the Owen Basin and the Oman abyssal plain (Rodriguez et al, 2014).…”

Section: U-unconformity and The Uplift Of The Murray Ridgementioning

confidence: 85%

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Tectonics of the Dalrymple Trough and uplift of the Murray Ridge (NW Indian Ocean)

Rodriguez¹,

Chamot‐Rooke²,

Huchon³

et al. 2014

Tectonophysics

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International audienceThe Dalrymple Trough is a 150-km-long, 30-km-wide basin located at the northern termination of the Owen Fracture Zone (OFZ), which is the present-day active India-Arabia plate boundary. The Dalrymple Trough is closely associated with the Murray Ridge, a complex of prominent bathymetric highs located on its eastern flank. Recent multibeam mapping of the connection between the Dalrymple Trough and the OFZ revealed a horsetail structure, which suggests a close relationship between geological histories of both structures. However, the 3-6 Ma age of initiation of the OFZ contrasts with the commonly accepted Early Miocene emplacement of the Dalrymple Trough. Recent seismic lines document a new tectonic history of the Dalrymple Trough, involving two major episodes of deformation along the India-Arabia plate boundary at ~ 8-10 Ma and ~ 1.9 ± 0.9 Ma. The 8-10 Ma episode is marked by a system of folds linked to the main uplift of the southern Murray Ridge and the first uplift of the northern Murray Ridge. This episode is related to a global plate reorganization event in the Late Miocene, well expressed by intraplate deformation in the Central Indian Ocean. The Dalrymple Trough opened at ~ 1.9 ± 0.9 Ma subsequently to the formation of a stepover at the India-Arabia plate boundary, coeval with the regional M-unconformity in the Oman abyssal plain, which marks a structural reorganization of the Makran accretionary wedge, and the last uplift of the northern Murray Ridge

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Section: U-unconformity and The Uplift Of The Murray Ridgementioning

confidence: 85%

“…4) (Gaedicke et al, 2002a, b;Smith et al, 2012). The overlying sequence adopts a wedge-shape geometry, with a maximal thickness of 3.5 km (Smith et al, 2012).…”

Section: M-unconformitymentioning

confidence: 99%

Tectonics of the Dalrymple Trough and uplift of the Murray Ridge (NW Indian Ocean)

Rodriguez¹,

Chamot‐Rooke²,

Huchon³

et al. 2014

Tectonophysics

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“…This age coincides with the rifting to spreading transition in the eastern Gulf of Aden. The OFZ terminates northwards into the Dalrymple Trough (McKenzie and Sclater, 1971), which consists of two sub-basins, a long and narrow basin with a half-graben structure to the south and a rhomboedric-shaped pullapart basin to the north (Minshull et al, 1992;Edwards et al, 2000;Gaedicke et al, 2002aGaedicke et al, , 2002bEllouz-Zimmermann et al, 2007). Oblique extensional features observed on seismic profiles are compatible with right-lateral motion and a minimum total extension of 5-7 km was estimated across the Dalrymple Trough (Edwards et al, 2000).…”

Section: Geodynamic Setting Of the Aoc Triple Junctionmentioning

confidence: 99%

Do ridge–ridge–fault triple junctions exist on Earth? Evidence from the Aden–Owen–Carlsberg junction in the NW Indian Ocean

et al. 2008

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“…The Murray Ridge is located southwest of the Pakistan margin and it starts about 100 km from the coast into the Arabian Sea; it is approximately 20 km wide and 750 km long. The Ridge is composed of three different parts: the southern crest at water depth < 1000 m, the northern zone is subdued with water depths of 2000 m and the > 4400 m deep Dalymple Trough (Gaedicke et al, 2002). The sedimentary cover of the Ridge increases in thickness towards the coast and it progressively widens.…”

Section: Study Areamentioning

confidence: 99%

Sink or link? The bacterial role in benthic carbon cycling in the Arabian Sea's oxygen minimum zone

et al. 2013

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Abstract. The bacterial loop, the consumption of dissolved organic matter (DOM) by bacteria and subsequent transfer of bacterial carbon to higher trophic levels, plays a prominent role in pelagic food webs. However, its role in sedimentary ecosystems is not well documented. Here we present the results of isotope tracer experiments performed under in situ oxygen conditions in sediments from inside and outside the Arabian Sea's oxygen minimum zone (OMZ) to study the importance of the microbial loop in this setting. Particulate organic matter, added as phytodetritus, was processed by bacteria, protozoa and metazoans, while dissolved organic matter was processed only by bacteria and there was very little, if any, transfer to higher trophic levels within the 7 day experimental period. This lack of significant transfer of bacterial-derived carbon to metazoan consumers indicates that the bacterial loop is rather inefficient, in sediments both inside and outside the OMZ. Moreover, metazoans directly consumed labile particulate organic matter resources and thus competed with bacteria for phytodetritus.

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Origin of the northern Indus Fan and Murray Ridge, Northern Arabian Sea: interpretation from seismic and magnetic imaging

Cited by 47 publications

References 19 publications

Tectonics of the Dalrymple Trough and uplift of the Murray Ridge (NW Indian Ocean)

Tectonics of the Dalrymple Trough and uplift of the Murray Ridge (NW Indian Ocean)

Do ridge–ridge–fault triple junctions exist on Earth? Evidence from the Aden–Owen–Carlsberg junction in the NW Indian Ocean

Sink or link? The bacterial role in benthic carbon cycling in the Arabian Sea's oxygen minimum zone

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