Our modelling is the first implementation of multi-scale mesh in the regional model. Among the major marginal sea basins from the west Paci? The Pearl River Mouth Basin is a Cenozoic rift basin located on the northern margin of the South China Sea Gong and Li. After that time, sediments were mainly transported from the modern Mekong River. Previous studies in the western tropical Pacific have concentrated on sea surface temperature, salinity, and hydrological variability and, particularly, ocean currents e. In addition to these classical approaches toward stratigraphic correlation, isotopic stratigraphy based on tuned astronomical cycles is playing an increasingly important role in refining the regional stratigraphy, especially at deep-sea settings. Most of these lineages diverged during the Pliocene and Late Pleistocene, a period with marked sea-level fluctuations.
It was characterized by progradational process from seismic attributes in general that the delta deposits gradually retrograded. The early middle to late Miocene rapid zigzagging migration of the lower main channel, first southward and then northward, was probably associated with the strong collision of the North Palawan Block with the Philippine Mobile Belt, which would have triggered submarine instabilities and deformed the seafloor. Zoophycos appears to represent a useful proxy to characterize high and seasonal organic-matter deposition and primary productivity in Neogene hemipelagic deposits. Then, the sea level became stabilized and consistently low dinoflagellate cyst abundances and high abundances of fern spores were recorded. Tectonically, the foreland basin consists of three structural zones: an eastern wedge-top, a central foredeep, and a western forebulge zones.
Step 2: Builing on sections of geological - geophysics to determine the density of the rock layer layer of seawater, sediments, basement, upper Manti. During deposition of the transgressive systems tract, mass transport deposits were funneled through a nonmigrating debris-flow channel with levees, which subsequently filled when highstand systems tract deposition began during the early Pleistocene. It has been found that the 1. The ob-served coarser silt turbidites may have a source in Taiwan or other surrounding blocks, whereas interbedded calcareous turbidites at this site could be trans-ported from local sources, such as nearby seamounts topped by carbonate plat-forms. Site U1431 records ev-idence for deep-marine turbidite deposition from terrestrial sources. The study area corresponds to the shelf-margin zone, which lies in the Baiyun Depression, the Southern Panyu Lower Uplift, and the southwestern Dongsha Uplift Fig.
The present paper attempts to synthesize progress in Pleistocene paleoceanography. Based on shipboard dating of microfossils in the sediment immediately above the basaltic basement and between the lava flow units, the preliminary cessation age of spreading in both the East and Southwest Subbasins is around early Miocene 16-20 Ma. Therefore, the tectonic subsidence had not always been relatively active. Quaternary was another reef drowning period in the study area, two large atoll reefs grown on the atoll system A were finally drowned, and hemipelagic deposits begun to drape and fill the palaeo-atoll systems. Glacial cooling in the tropical region continued from 2.
Description: 1 online resource x, 506 pages : illustrations some color , maps. The tropical nature of the Neogene faunas is revealed by the occurrences of large foraminifers and warm-water species of other groups. In this chapter, we overview recent progresses of deep water research in the region by focusing on benthic foraminiferal, ostracod and isotopic geochemistry records from Site 1148. There are 439 atolls identified in the present summary, but the list is broadly constructed, inclusive, and not limited to those known to have formed on subsiding volcanic platforms. Hochrangige archäologische Funde und historisch bedeutsame Ereignisse werden auf der Grundlage jüngster, bislang unveröffentlichter Forschungsergebnisse mit Wetter- und Klimaphänomenen in einen konkreten Zusammenhang gebracht. The distribution of different composite unconformity belts represented the location of palaeo-uplift that formed in response to compound and complex tectonic events. As marginal basins, the basic features of the China Seas are predominated by interactions between the Asian continent and the Pacific Ocean.
The volcaniclastic breccia and sandstone at Site U1431 are dated as late middle Miocene to early late Miocene ~8-13 Ma , suggesting a 5 m. Therefore, preservation is not an important factor on the deposition of n-alkanes. Conversely, in the East China Sea, it attains lower abundances during the Holocene, while higher ones in last glacial stage. Among the marginal basins worldwide, these areas have been the focus of extensive research activities in the last three decades, and are now among the global hot spots in hydrocarbon explorations and scientific investigations. Seismic facies analysis indicates that sedimentation within the foreland basin has been dominated by turbidity currents and the other gravity transport processes.
Under a glacial climate, however, strengthened weathering and erosion would promote the transport of terrestrial matters into the ocean Wang and Li, 2009. In my opinion, this is a reliable result. The model method of gravity is a new approach to solving problems. The overall zigzagging pattern of the canyon thalweg as seen in cross-section through time results from lateral and downstream migration in an aggradational environment. We have inferred that late Cretaceous to the middle Eocene rifting is characterized by uniform lithospheric stretching related to the retreat of the paleo-Pacific subduction zone, whereas the late Eocene to the early Oligocene rifting controlled by multiple factors is characterized by depth-dependent lithospheric extension.
Meanwhile, during glacials, the exposure of continental shelves due to low sea level caused by ice volume expansion in high latitudes would enhance the erosion of emerged shelves and shorten the distance between river mouth and deposition location. The inpouring of some of the largest rivers in Asia with huge catchment area constitutes another important morphological feature. They represent three stages of evolution of the foreland basin. Carbonate and organic matter were not removed before grain size measurements, so their influences on grain size results cannot be ignored. Contents: Oceanographical and Geological Background -- Stratigraphy and Sea Level Changes -- Sedimentology -- Upper Water Structure and Paleo-Monsoon5 -- Deep Waters and Oceanic Connection -- Biogeochemistry and the Carbon Reservoir -- History of the South China Sea -- A Synthesis. However, the lack of geochronological studies in previous works inhibits our understanding of their contributions. The sediment they carry potentially records the longterm evolution of continental environments within the marine stratigraphic record.
The associated mixed turbiditecontourite depositional system has persisted to the present. As this result, the basement depth is very complex and its reflects the tectonic and geodynamic of the area in the Cenozoic period. Total organic carbon content and ratio of total organic carbon: total nitrogen, along with pore water phosphate concentration and salinity, were the statistically most significant variables that explained the bacterial community cluster pattern, which indicates potential linkages of bacterial communities to changes in quality and quantity of buried organic matter over geological time scales. However, when the wind intensity was doubled during glacial low sea-level conditon, the throughflow restored largely to reach a similar residence time 18. Despite extensive studies, sampling of basement rock and directly overlying basal sediment in the deep basin is lacking.