Provenance of Holocene sediments in the outer part of the Paleo-Qiantang River estuary, China

Xia, Zhang; Dalrymple, Robert W.; Yang, Shouye; Lin, Chun-Ming; Wang, Ping

doi:10.1016/j.margeo.2015.04.008

Cited by 43 publications

(26 citation statements)

References 39 publications

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“…Clastic sedimentary rocks generally have La/Sc ratio (≈ 1.5) of less than 2 and a Co/Th ratio (≈ 6.9) concentrated between 1 and 10, and the samples are concentrated within basalt and andesite fields. These findings are in line with those published by Zhang et al [35], Badawy et al [12]. Additionally, it should be noted that the Th/Sc ratio is 0.2 which is close to the mafic source of materials according to Gu et al [36].…”

Section: Findings Of the Discriminant Da Analysis And Sedimentary Provenancesupporting

confidence: 92%

Vertical Distribution of Major and Trace Elements in a Soil Profile from the Nile Delta, Egypt

Badawy

Frontasyeva

Elhaes

2020

Ecological Chemistry and Engineering S

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The present study was conducted to highlight the elemental composition of ten soil samples collected at different depths along of a soil profile (0.25-17 m). The collected samples were subjected to epithermal neutron activation analysis at the pulsed reactor IBR-2 of Frank Laboratory of Neutron Physics - Joint Institute for Nuclear Research - Dubna - Russian Federation. The concentrations in mg/kg of 36 major and trace elements were determined. Symbatic behaviour of geochemically related elements was observed: Th and U; Cl and Br and Fe, Ti, Ca, Al, and Mg, etc. A sharp increase of certain concentrations at the depth of 8 m was observed. Significant mafic sources of elements were observed and mostly are attributed to Ethiopian High Plateau with small amount of felsic volcanic rocks.

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Section: Findings Of the Discriminant Da Analysis And Sedimentary Provenancesupporting

confidence: 92%

Vertical Distribution of Major and Trace Elements in a Soil Profile from the Nile Delta, Egypt

Badawy

Frontasyeva

Elhaes

2020

Ecological Chemistry and Engineering S

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“…In reality, the width of the upper and middle reaches of QE in the past was much larger than at present. Geological survey revealed that the width of sand accumulation body of the upper and middle QE can be up to 50 km, and the thickness can be more than 100 m [Chen et al, 1964;Zhang et al, 2015]. Hence, the sediment volume for the formation of the sandbar in the model is about 2 orders less than in reality.…”

Section: 1002/2017jf004293mentioning

confidence: 99%

Morphodynamic modeling of a large inside sandbar and its dextral morphology in a convergent estuary: Qiantang Estuary, China

et al. 2017

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We investigate the evolution of a large‐scale sand body, a unique type of sandbars in a convergent estuary. Specifically, we analyze and simulate the sand deposition system (defined as an inside bar) in the Qiantang Estuary (QE) in China. The deposit is 130 km long and up to 10 m thick and is characterized by a dextral morphology in the lower QE. Numerical simulation is carried out using an idealized horizontal 2‐D morphodynamic model mimicking the present QE settings. Our results indicate that the morphological evolution is controlled by the combination of river discharge and tides. The seasonal and interannual cycles of river discharges play a major role on the inside bar evolution. The bar is eroding during high river discharge periods, but accretion prevails during low river discharge periods. Meanwhile, the highest part of the sand body can move downstream or upstream by several kilometers, modifying the seasonal sediment exchange patterns. We also show that the Coriolis force plays an important role on the dextral morphology patterns in wide, convergent estuaries. It induces a significant lateral water level difference and a large‐scale gyre of residual sediment transport. Subsequently, the seaward tail of the inside bar shifts southward to help create a condition for the development of tidal flats in the lower reach of the estuary. The lateral bed level differences induced by Coriolis force are up to several meters. Coriolis effects also modify the behavior of flood and ebb tidal channels.

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“…Cores ZK01 (112 m penetration depth, 0.1 m diameter) and ZK02 (128 m penetration depth, 0.1 m diameter) were taken from Qidong (31°50 0 26.74 00 N, 121°33 0 24.08 00 E) and River) delta showing the locations of cores ZK01 and ZK02, boreholes, cross section, and gas-bearing area, as well as the basal topography of the Changjiang incised valley during the Last Glacial Maximum (modified from Wang 1982;Zheng 1998;Li et al 2002;Zhang et al 2015). b Locations of core ZK01, cone penetration tests (CPTs), and transects in the Qidong area from the northern margin of the modern Changjiang delta (see location in Fig.…”

Section: Methodsmentioning

confidence: 99%

Characteristics and accumulation model of the late Quaternary shallow biogenic gas in the modern Changjiang delta area, eastern China

Zhang

Lin

2017

Pet. Sci.

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The Changjiang (Yangtze) is one of the largest rivers in the world. It formed a huge incised valley at its mouth during the Last Glacial Maximum; the incised-valley fill, approximately 80-110 m thick, supplies an important foundation for the generation of shallow biogenic-gas reservoirs. Two cores and 13 cone penetration tests were used to elaborate the characteristics, formation mechanism, and distribution of the shallow biogenic-gas reservoirs in the study area. The natural gas is mainly composed of CH 4 (generally[95%) with a d 13 C CH4 and d 13 C CO2 of -75.8 to -67.7% and -34.5 to -6.6%, respectively, and a dD CH4 of -215 to -185%, indicating a biogenic origin by the carbon dioxide reduction pathway. Commercial biogenic gas occurs primarily in the sand bodies of fluvial-channel, floodplain, and paleo-estuary facies with a burial depth of 50-80 m. Gas sources as well as cap beds are gray to yellowish-gray mud of floodplain, paleoestuary, and offshore shallow marine facies. The organic matter in gas sources is dominated by immature type III kerogen (gas prone). The difference in permeability (about 4-6 orders of magnitude) between cap beds and reservoirs makes the cap beds effectively prevent the upward escape of gas in the reservoirs. This formation mechanism is consistent with that for the shallow biogenic gas in the late Quaternary Qiantang River incised valley to the south. Therefore, this study should provide further insight into understanding the formation and distribution of shallow biogenic gas in other similar postglacial incised-valley systems.

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Provenance of Holocene sediments in the outer part of the Paleo-Qiantang River estuary, China

Cited by 43 publications

References 39 publications

Vertical Distribution of Major and Trace Elements in a Soil Profile from the Nile Delta, Egypt

Vertical Distribution of Major and Trace Elements in a Soil Profile from the Nile Delta, Egypt

Morphodynamic modeling of a large inside sandbar and its dextral morphology in a convergent estuary: Qiantang Estuary, China

Characteristics and accumulation model of the late Quaternary shallow biogenic gas in the modern Changjiang delta area, eastern China

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