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Sverre Planke - One of the best experts on this subject based on the ideXlab platform.
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a diverted submarine channel of early Cretaceous Age revealed by high resolution seismic data sw barents sea
Marine and Petroleum Geology, 2018Co-Authors: Romain Corseri, Thea Sveva Faleide, Jan Inge Faleide, Ivar Midtkandal, Christopher Saebo Serck, Mikal Trulsvik, Sverre PlankeAbstract:Abstract Mud-rich prograding sediment lobes make for most of the Barremian – Albian stratigraphic record in the SW Barents Sea. Submarine canyons and channels potentially represent key components of sediment transport from shelf to basin floor but geological evidences are lacking. We present high-resolution seismic data and scrutinize an elongated, ∼150-km long bright seismic amplitude and resistive anomaly located alongslope of a NW-sourced Barremian delta in the SW Barents Sea. Seismic interpretation is performed on a comprehensive database comprising 3D/2D high-resolution P-Cable and conventional seismic data, tied to three exploration wells to provide Age-control on key horizons. Our results highlight that the elongated geophysical anomaly originates from a soft layer deposited over a harder, erosional surface. The erosive morphology displays three narrow, V-shaped incisions to the NE of the Hoop area which develop into a single, ∼6 km-wide, U-shaped channel towards the transition to the Fingerdjupet Subbasin. The geological feature is named Ceres and interpreted as a submarine channel carved in Aptian, a period of marked sea level rise and sediment starvation in the Hoop area. An evolutionary model of a diverted submarine channel is proposed where a flooded delta lobe acted as a topographic barrier, funneling bottom currents and thereby carving an alongslope, possibly contouritic channel. This is the first documented case of a submarine channel pathway – delta lobe interaction on the Norwegian continental shelf. To account for the geophysical expression of Ceres, two competing explanations are discussed: (1) hydrocarbon-bearing sands, and (2) organic-rich source rock. Both scenarios have important implications for petroleum prospectivity: a faulted stratigraphic trap holding large volumes of hydrocarbons or alternatively the channel-controlled distribution of mature Aptian source rock in the SW Barents Sea.
Baoyu Jiang - One of the best experts on this subject based on the ideXlab platform.
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new evidence for Cretaceous Age of the feathered dinosaurs of liaoning zircon u pb shrimp dating of the yixian formation in sihetun northeast china
Cretaceous Research, 2007Co-Authors: Wei Yang, Baoyu JiangAbstract:We present the first report of U-Pb SHRIMP dating of zircons from three tuffs interbedded within the ‘‘feathered dinosaur’’-bearing deposits in western Liaoning, China. One is a sample from the Bed 6 tuff (LX-SHT-12) of the Yixian Formation in Sihetun, for which our zircon U-Pb SHRIMP analyses gave a Cretaceous Age (124.7 � 2.7 Ma), in agreement with a previously published sanidine 40 Ar/ 39 Ar Age (124.60 � 0.25 Ma). The other two are from the Bed 1 tuff (LX-HBJ-1) and Bed 8 tuff (LX-HBJ-6) of the Yixian Formation in Huangbanjigou; the former gave an Age of 124.9 � 1.7 Ma, the latter an Age of 122.8 � 1.6 Ma. The three consistent Ages indicate that the Yixian Formation was deposited in the Early Cretaceous within a very short time period (ca. 2 Ma). 2006 Published by Elsevier Ltd.
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studies on the early Cretaceous longzhaogou and jixi groups of eastern heilongjiang northeast china and their bearing on the Age of supposedly jurassic strata in eastern asia
Journal of Asian Earth Sciences, 2002Co-Authors: Jingeng Sha, Huawei Cai, Jianhong Jiang, Deshun Yin, Xifeng Zhao, Zhixun Liu, Baoyu JiangAbstract:Abstract The coal-bearing Longzhaogou and Jixi Groups in eastern Heilongjiang, northeast China, consist of alternating marine and non-marine deposits containing abundant marine animal and plant fossils. The Jixi Group also yields members of the Johel Fauna that is widely distributed in northern and eastern China. The two groups have been considered as Jurassic or mainly Jurassic in Age for a long time. However, recent studies documented that the ammonites, bivalves, dinoflAgellates, angiosperms and sporopollens are all of Early Cretaceous rather than Jurassic Age. It has been demonstrated that: (1) the Longzhaogou and Jixi Groups and their equivalents, the Johel Group of China and the Transbaikalian Group of Russia, are of Early Cretaceous Age, (2) the Barremian-Albian was also a very important period of coal accumulation in northeastern China and perhaps in all of eastern Asia, (3) there existed a large shallow embayment connecting with the Palaeo-Pacific in eastern Heilongjiang, and it was the climate of the embayment that controlled the origin and development of the animal and plant communities of northeastern China during the Early Cretaceous. Correlation between formations in the Jixi and Longzhaogou Groups has also been revised in this paper.
Romain Corseri - One of the best experts on this subject based on the ideXlab platform.
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a diverted submarine channel of early Cretaceous Age revealed by high resolution seismic data sw barents sea
Marine and Petroleum Geology, 2018Co-Authors: Romain Corseri, Thea Sveva Faleide, Jan Inge Faleide, Ivar Midtkandal, Christopher Saebo Serck, Mikal Trulsvik, Sverre PlankeAbstract:Abstract Mud-rich prograding sediment lobes make for most of the Barremian – Albian stratigraphic record in the SW Barents Sea. Submarine canyons and channels potentially represent key components of sediment transport from shelf to basin floor but geological evidences are lacking. We present high-resolution seismic data and scrutinize an elongated, ∼150-km long bright seismic amplitude and resistive anomaly located alongslope of a NW-sourced Barremian delta in the SW Barents Sea. Seismic interpretation is performed on a comprehensive database comprising 3D/2D high-resolution P-Cable and conventional seismic data, tied to three exploration wells to provide Age-control on key horizons. Our results highlight that the elongated geophysical anomaly originates from a soft layer deposited over a harder, erosional surface. The erosive morphology displays three narrow, V-shaped incisions to the NE of the Hoop area which develop into a single, ∼6 km-wide, U-shaped channel towards the transition to the Fingerdjupet Subbasin. The geological feature is named Ceres and interpreted as a submarine channel carved in Aptian, a period of marked sea level rise and sediment starvation in the Hoop area. An evolutionary model of a diverted submarine channel is proposed where a flooded delta lobe acted as a topographic barrier, funneling bottom currents and thereby carving an alongslope, possibly contouritic channel. This is the first documented case of a submarine channel pathway – delta lobe interaction on the Norwegian continental shelf. To account for the geophysical expression of Ceres, two competing explanations are discussed: (1) hydrocarbon-bearing sands, and (2) organic-rich source rock. Both scenarios have important implications for petroleum prospectivity: a faulted stratigraphic trap holding large volumes of hydrocarbons or alternatively the channel-controlled distribution of mature Aptian source rock in the SW Barents Sea.
Xiaoqiao Wan - One of the best experts on this subject based on the ideXlab platform.
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a latest Cretaceous gastropod fauna from the jiaolai basin of east asia
Cretaceous Research, 2021Co-Authors: Rodrigo B Salvador, He Wang, Yanan Fang, Thomas A Neubauer, Haichun Zhang, Xiaoqiao WanAbstract:Abstract A non-marine gastropod fauna from the continuous uppermost Campanian to Maastrichtian deposits of the Jiaolai Basin (eastern North China) was studied. Four species attributed to four genera and an undetermined species were described, including Truncatella jiaozhouensis sp. nov., ?Pomatiopsidae gen. et sp. indet., ?Hydrobia datangensis Yu, 1977, Valvata jiaolaiensis sp. nov., and Physa sp. Among them, two new species were established. The finding of ?Hydrobia datangensis is consistent with a Late Cretaceous Age as previously inferred from the charophyte flora. Available sedimentological data of the gastropod-bearing beds combined with a gastropod taphonomical study suggest that all five species lived in shallow lakes, whereas ?Pomatiopsidae gen. et sp. indet. also inhabited floodplains. Furthermore, extant Truncatella species are either fully terrestrial or dwell amphibiously in the supralittoral zone in temperate to tropical regions, usually close to the water line, as well as near freshwater of river estuaries. Therefore, Truncatella jiaozhouensis sp. nov. supposedly has lived in the surrounding shorelines of the shallow lake.
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a new Cretaceous Age for the saiqu melange southern tibet evidence from radiolaria
Cretaceous Research, 2009Co-Authors: Xiaoqiao Wan, Wencan Liu, Hugo Bucher, Nicolas GoudemandAbstract:This study concerns the melange that crops out in the north of Saiqu, Sagya County, southern Tibet. The Age of the melange has been debated for years, because the Ages of fossils from various blocks conflicted with each other, and no macrofossils had been discovered from the matrix. Furthermore, no one had looked at the matrix for microfossils, mainly because of their mistaking this suite of melange as straightforward sedimentary strata. However, abundant microfossils are present in the matrix of the melange, and four radiolarian assemblAges have been recognized: (1) Holocryptocanium aff. barbui-Dictyomitra turris; (2) Acanthocircus dicrancanthos-Thanarla pulchra ;( 3)Thanarla veneta- Pseudodictyomitra pseudomacrocephala; and (4) Dictyomitra magnifica-Dictyomitra turritum. The matrix-derived radiolarian assemblAges indicate a Late Cretaceous Age. The melange in Saiqu can be correlated with the Zongzhuo Formation of neighbouring regions by either lithological associations or fossil assemblAges. Consequently, the melange has been referred to the Upper Cretaceous Zongzhuo Formation, instead of the Triassic Xiukang Group, with which it was previously associated. The melange of the Zongzhuo Formation resulted from the subduction of the Indian Plate beneath the Asian Plate during the Late Cretaceous.
Yi Chen - One of the best experts on this subject based on the ideXlab platform.
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tethyan suturing in southeast asia zircon u pb and hf o isotopic constraints from myanmar ophiolites
Geology, 2016Co-Authors: Sunlin Chung, Fuyuan Wu, Chang Zhang, Yang Xu, Jiangang Wang, Yi ChenAbstract:Ophiolites that crop out in Southeast Asia represent the relics of the Tethys Ocean, which existed between the continents of Gondwana and Laurasia during much of the Mesozoic. Two ophiolite belts in Myanmar, i.e., the Eastern Belt and the Western Belt, have been conventionally regarded as parts of a single suture connecting with the Yarlung-Tsangpo suture in the Tibetan Plateau and displaced by the dextral Sagaing fault. Here we present for the first time a combined analysis of zircon secondary ion mass spectrometry U-Pb Ages and Hf-O isotopes of two Myanmar ophiolites, the Kalaymyo ophiolite from the Western Belt and the Myitkyina ophiolite from the Eastern Belt. Our results show that the Kalaymyo ophiolite has an Early Cretaceous Age (ca. 127 Ma), coeval with Neo-Tethyan ophiolites along the Yarlung-Tsangpo suture. In contrast, the Myitkyina ophiolite was formed during the Middle Jurassic (ca. 173 Ma) and thus the Eastern Belt is the southern continuation of the Meso-Tethyan Bangong-Nujiang suture in the Tibetan Plateau. Consequently, we argue that the two Myanmar ophiolite belts belong to two different sutures of the Meso-Tethys and Neo-Tethys, and that the boundary between the Sibumasu and west Burma blocks is a Jurassic suture rather than a transcurrent shear zone.