Two Contrasting Styles of Lowstand Deltaic Wedges: The Roda Sandstone (Spain) as Seen from Outcrops and the Late Pleistocene Mahakam Delta (Indonesia) as Imaged from 3D and 2D Hr Seismic Profiles

Plio-Quaternary history of the Turkish coastal zone of the Enez-Evros Delta: NE Aegean Sea

Mediterranean Marine Science ◽

10.12681/mms.269 ◽

2001 ◽

Vol 2 (2) ◽

pp. 95 ◽

Cited By ~ 8

Author(s):

B. ALPAR

Keyword(s):

Late Pleistocene ◽

Sand Dunes ◽

Aegean Sea ◽

Interglacial Period ◽

Shelf Area ◽

Sea Level Changes ◽

Seismic Profiles ◽

Alluvial Deposits ◽

History Of ◽

Quaternary History

The Enez-Evros Delta, NE Aegean Sea, is located in one the most important wetlands in the world with its sandy offshore islands, abandoned channel mouths, sand-dunes, shoals, marshlands, saline lagoons and saltpans. It comprises very well developed sedimentary units and a prodelta lying on an older submarine delta. The present day elevations of the middle-late Pleistocene marine terraces indicate a regional tectonic uplift in the area. Due to lack of geophysical and bore hole data and partly due to its strategic position, the structural and stratigraphic features of the submarine extension of the delta are not known in detail. In this paper, Plio-Quaternary history of this delta and its submarine part on the Turkish shelf was explored by using high-resolution shallow reflection seismic profiles. The delta is formed by the alluvial deposits of the Enez-Evros River and shaped by their interaction with the sea. It takes place in front of a large and protected ancient bay which was filled rapidly over millennia. The sediments in the plateau off the river are principally pro-deltaic with muddy areas near the river mouths changing to muddy sand further out. The sea-level changes in Plio-Quaternary were characterised by three different seismic stratigraphic units on the folded Miocene limestone basement. In the late Pleistocene, the shelf area over an Upper Miocene basement was flooded during the Riss-Würm interglacial period, exposed in the Würm glacial stage, and flooded once again during the Holocene transgression.

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THE PALEO-ENVIRONMENTAL SETTING OF SEPETIBA BAY, RIO DE JANEIRO, BRAZIL, IN THE LATE PLEISTOCENE: INTERPRETATIONS FROM HIGH-RESOLUTION SEISMIC STRATIGRAPHY

Brazilian Journal of Geophysics ◽

10.22564/rbgf.v33i4.762 ◽

2015 ◽

Vol 33 (4) ◽

Author(s):

Heloisa Vargas Borges ◽

Charles A. Nittrouer

Keyword(s):

High Resolution ◽

Late Pleistocene ◽

Seismic Data ◽

Rio De Janeiro ◽

Single Channel ◽

Seismic Stratigraphy ◽

Seismic Profiles ◽

Sepetiba Bay ◽

Environmental Setting ◽

Geological Evolution

ABSTRACT. Single-channel high-resolution seismic profiles in Sepetiba Bay, Brazil, were collected to describe the recent geological evolution of this area. The seismic data showed... RESUMO. Perfis sísmicos de alta resolução da Baía de Sepetiba, Brasil, foram coletados com o objetivo de descrever a evolução geológica recente desta área. Os dados sísmicos...

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Late-glacial fluctuations of two southern Patagonia outlet glaciers revealed by high-resolution seismic surveys

Quaternary Research ◽

10.1017/qua.2020.20 ◽

2020 ◽

Vol 97 ◽

pp. 111-124 ◽

Cited By ~ 1

Author(s):

Emanuele Lodolo ◽

Jorge Lozano ◽

Federica Donda ◽

Donald Bran ◽

Luca Baradello ◽

...

Keyword(s):

High Resolution ◽

Late Pleistocene ◽

Late Glacial ◽

Seismic Profiles ◽

Seismic Surveys ◽

Southern Patagonia ◽

Minimum Age ◽

General Phase ◽

Lake Floor ◽

Bathymetric Map

AbstractLago Argentino hosts various calving glaciers, among them the famous Perito Moreno. Whereas the onland late Pleistocene–Holocene glacial history is rather well constrained, the submerged glacier-related features were until now undisclosed. Here we present a series of high-resolution seismic profiles revealing moraine bodies associated with the late-glacial glacier dynamics and the first bathymetric map of the Brazo Rico and Brazo Sur, the two southern arms of Lago Argentino. At the eastern termination of Brazo Rico, we identified at the lake floor the submerged expression of the Puerto Bandera 3 moraine mapped onshore, which represents the oldest event (12,660 ± 70 cal yr BP oldest minimum age) recognized in this lake arm, and seven other younger events expressed by a series of terminal and recessional moraines. Along the Brazo Sur, few moraine bodies have been imaged by seismic data. Here, the youngest temporal constraint comes from the Frías moraine (ca. 6000 cal yr BP), which closes off the southern end of the Brazo Sur. At the confluence of the two arms, the Perito Moreno and the former Frías glacier merged and flowed toward east during their late-glacial maximum advance (i.e., Puerto Bandera 1 moraine). The subaqueous evidence of moraine bodies testifies to the occurrence of previously undocumented pulses of the Perito Moreno and former Frías glaciers within the general phase of late Pleistocene–Holocene regression.

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Seismic characteristics and sedimentary record of the late Pleistocene delta offshore southwestern Hainan Island, northwestern South China Sea

Interpretation ◽

10.1190/int-2018-0012.1 ◽

2018 ◽

Vol 6 (4) ◽

pp. SO31-SO43 ◽

Cited By ~ 7

Author(s):

Yingci Feng ◽

Wenhuan Zhan ◽

Hongjun Chen ◽

Tao Jiang ◽

Jinchang Zhang ◽

...

Keyword(s):

South China Sea ◽

Sea Level ◽

Late Pleistocene ◽

South China ◽

Hainan Island ◽

Glacial Period ◽

Eastern Slope ◽

Seismic Profiles ◽

China Sea ◽

Global Sea Level

A late Pleistocene delta (Hainan palaeo river delta, HNPD hereafter) exceeding [Formula: see text] offshore Hainan Island, northwestern South China Sea (SCS), is investigated using high-resolution seismic and core data to understand the relationship between subaqueous delta development and climate drivers during the Last Glacial Period. The seismic data indicate general progradational configurations toward the southwest or southeast, indicating that the sediments from the eastern slope offshore southwestern Hainan Island were transported southwestward and southeastward. The average thickness of the delta sediment is approximately 35 m, and it has an arcuate shape surrounding the eastern slope. Therefore, the sediment provenances of the HNPD were mainly from the Red River drainage and Hainan Island. Comparison between the core dating results and the global sea-level curve indicates that the delta formed mainly during marine isotope stage 4 (65–56 ka). The topography of the basin, the sea-level change from low stand to high stand, and the southward oceanic currents driven by the glacial-period strong winter monsoon all contributed to the formation of the delta. Because the development of the delta required large riverine sediment input, we speculate that the main reason that the delta’s development ceased was the migration of the river channel along the eastern slope. Based on a comparison between the palaeobathymetric scenarios derived from published sea-level curves and the delta stratigraphy identified from the seismic profiles and cores, we have determined a possible range of relative sea level between 65 and 56 ka for the southwestern coast of Hainan Island, which might also be applicable for a broader region, i.e., the northern SCS.

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Sequence stratigraphy based on high-resolution seismic profiles in the late Pleistocene and Holocene deposits of the Venice area

Marine Geology ◽

10.1016/j.margeo.2008.05.010 ◽

2008 ◽

Vol 253 (3-4) ◽

pp. 185-198 ◽

Cited By ~ 70

Author(s):

Massimo Zecchin ◽

Luca Baradello ◽

Giuliano Brancolini ◽

Federica Donda ◽

Federica Rizzetto ◽

...

Keyword(s):

High Resolution ◽

Sequence Stratigraphy ◽

Late Pleistocene ◽

Seismic Profiles

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Seismic Facies of Pleistocene–Holocene Channel-fill Deposits in Bawean Island and Adjacent Waters, Southeast Java Sea

BULLETIN OF THE MARINE GEOLOGY ◽

10.32693/bomg.32.1.2017.373 ◽

2017 ◽

Vol 32 (1) ◽

Author(s):

Ali Albab ◽

Noor Cahyo Dwi Aryanto

Keyword(s):

Late Pleistocene ◽

Seismic Facies ◽

Seismic Profiles ◽

Widespread Distribution ◽

Geological Interpretation ◽

Fluvial Deposits ◽

Stratigraphic Architecture ◽

Incised Channel ◽

Java Sea ◽

Shape And Size

The late Pleistocene-Holocene stratigraphic architecture of the Bawean Island and surrounding waters, southeast Java Sea has been analyzed by using sparker seismic profiles. Geological interpretation of these seismic profiles revealed the widespread distribution of paleochannels with different shape and size in the present-day Java Sea. Two channel types can be distinguished based on its morphology: U-shaped channels in the western part and V-shaped channels in the eastern part. The stratigraphic successions were grouped into two major seismic units separated by different seismic boundaries. Characters of marine and fluvial deposits were determined based on seismic boundaries and internal reflectors. Three seismic facies can be identified within late Pleistocene – Holocene incised channel fills associated with SB2. The internal structure of incised-channels consist of chaotic reflector at the bottom, covered by parallel–sub parallel and almost reflection-free indicating the homogenous sediment deposited during the succession.Keywords : Pleistocene-Holocene channel fills, sparker seismic profiles, seismic boundaries, incised–channel, Java Sea. Rekaman seismik sparker digunakan untuk menganalisis endapan stratigrafi berumur Plistosen Akhir–Holosen di Perairan Pulau Bawean dan sekitarnya. Berdasarkan interpretasi geologi dari rekaman seismik tersebut teridentifikasi sebaran alur purba yang berbeda bentuk dan ukuran dengan kondisi Laut Jawa sekarang. Berdasarkan morfologinya, dua tipe alur purba yang terdentifikasi adalah alur purba berbentuk U di bagian barat dan berbentuk V yang terbentuk di bagian timur daerah penelitian. Suksesi stratigrafi kemudian dibedakan menjadi dua grup unit seismik utama yang dibatasi oleh perbedaan batas seismik, yaitu endapan asal darat dan laut yang ditentukan berdasarkan batas sikuen dan reflektor internal. Pada unit Pleistosen–Holosen teridentifikasi tiga tipe fasies seismik yang berkorelasi pada batas sikuen SB2. Struktur internal alur purba yang tertoreh terdiri dari reflektor kaotik yang di bagian bawah, kemudian ditutupi oleh reflektor paralel - sub paralel sampai hampir bebas refleksi yang mengindikasikan terendapkannya sedimen homogen selama suksesi tersebut.Kata kunci : Pengisi alur Plistosen - Holosen, penampang seismik sparker, batas seismik, alur tertoreh, Laut Jawa.

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