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Carbonate delta drift: A new sediment drift type

Lüdmann, Thomas ; Betzler, Christian ; Eberli, Gregor P. ; Reolid, Jesús ; Reijmer, John J.G. ; Sloss, Craig R. ; Bialik, Or M. ; Alvarez-Zarikian, Carlos A. ; Alonso-García, Montserrat ; Blättler, Clara L. ; Guo, Junhua Adam ; Haffen, Sébastien ; Horozal, Senay ; Inoue, Mayuri ; Jovane, Luigi ; Kroon, Dick ; Lanci, Luca ; Laya, Juan Carlos ; Mee, Anna Ling Hui ; Nakakuni, Masatoshi ; Nath, B. Nagender ; Niino, Kaoru ; Petruny, Loren M. ; Pratiwi, Santi D. ; Slagle, Angela L. ; Su, Xiang ; Swart, Peter K. ; Wright, James D. ; Yao, Zhengquan ; Young, Jeremy R.

Marine geology, 2018-07, Vol.401, p.98-111 [Periódico revisado por pares]

Elsevier B.V

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Título:
Carbonate delta drift: A new sediment drift type
Autor: Lüdmann, Thomas ; Betzler, Christian ; Eberli, Gregor P. ; Reolid, Jesús ; Reijmer, John J.G. ; Sloss, Craig R. ; Bialik, Or M. ; Alvarez-Zarikian, Carlos A. ; Alonso-García, Montserrat ; Blättler, Clara L. ; Guo, Junhua Adam ; Haffen, Sébastien ; Horozal, Senay ; Inoue, Mayuri ; Jovane, Luigi ; Kroon, Dick ; Lanci, Luca ; Laya, Juan Carlos ; Mee, Anna Ling Hui ; Nakakuni, Masatoshi ; Nath, B. Nagender ; Niino, Kaoru ; Petruny, Loren M. ; Pratiwi, Santi D. ; Slagle, Angela L. ; Su, Xiang ; Swart, Peter K. ; Wright, James D. ; Yao, Zhengquan ; Young, Jeremy R.
Assuntos: Bottom current ; Carbonate platform ; Clinoform ; Delta drift ; Drift sedimentation ; Maldives
É parte de: Marine geology, 2018-07, Vol.401, p.98-111
Descrição: Based on high-resolution reflection seismic and core data from IODP Expedition 359 we present a new channel-related drift type attached to a carbonate platform slope, which we termed delta drift. Like a river delta, it is comprised of several stacked lobes and connected to a point source. The delta drifts were deposited at the exit of two gateways that connect the Inner Sea of the Maldives carbonate platform with the open ocean. The channels served as conduits focusing and accelerating the water flow; Entrained material was deposited at their mouth where the flows relaxed. The lobe-shaped calcareous sediment drifts must have formed under persistent water through flow. Sediment supply was relatively high and continuous, resulting in an average sedimentation rate of 17 cm ka−1. The two delta drifts occupy 342 and 384 km2, respectively; with a depositional relief of approximately 500 m. They have a sigmoidal clinoform reflection pattern with a particular convex upward bending of the foresets. In the Maldives the drift onset marks the transition from a sea-level controlled to a progressively current dominated depositional regime. This major event occurred in the Serravallian about 13 Ma ago, leading to the partial drowning of the carbonate platform and the creation of shallow seaways. The initial bank-enclosed topography resembles an “empty bucket” geometry which is rapidly filled by the drift sediments that aggrade and prograde into the basin. Thereby the depositional environment of the delta drifts changes from deep water (>500) to shallow-water conditions at their topsets, indicated by the overall coarsening upward trend in grain size and the presence of shallow water large benthic foraminifers at their top. •Introduction of a new sediment drift type based on seismic and IODP Leg 359 data•The calcareous deposit is denominated delta drift with sigmoidal clinoform geometry.•The delta drift is a channel-related drift type attached to a carbonate platform slope.•It is deposited under a current-controlled regime in deep to shallow water setting.•It occupies 342 to 384 km2 with a depositional relief of approximately 500 m.
Editor: Elsevier B.V
Idioma: Inglês

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Carbonate delta drift: A new sediment drift type

Elsevier B.V

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