Chapter 16 Sequence stratigraphy of the eastern Venezuelan basin
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Passive margin
Neogene
Cenomanian
Sequence (biology)
Sequence Stratigraphy
Based on discussing each unit of the lithostratigraphic rock composition,fossil assemblages and depositional environment from Mesozoic to Cenozoic in Wulaga fault-depression,Jiayin County,Heilongjiang Province,and comparison with other basins in Sunwu-Jiayin and Songliao basin,the authors divided the Mesozoic and Cenozoic strata into three tectonic layers and five lithostratigraphic units,and discussed their distribution and evolution,and made the regional geological map.The Wulaga basin shows three significantly different basin evolution stages,during which the two distinct unconformities are recognised,namely: the unconformity between upper Cretaceous and Lower Cretaceous and between the Upper Cretaceous and Neogene,thus made three different types of basin evolution stages in Wulaga from Mesozoic to Cenozoic;they are Early Cretaceous rift basin evolution stage,the Late Cretaceous large scale inland depression,and Neogene inland basin evolution stages.
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Recent studies of the Redding Formation of California provided new information concerning the extent of Cretaceous deposits underlying the southern Modoc Plateau. Understanding the stratigraphy and depositional environments of the Cretaceous rocks in this region is important for both paleogeographic reconstruction and hydrocarbon exploration. The Redding Formation is an approximately 1600-m thick clastic sequence that can be divided into five lithologic members. Biostratigraphic data indicate that the members of the Redding Formation are time-transgressive. The lowest three members were deposited during the middle to late Turonian, whereas the upper two accumulated during the Coniacian to santonian. The disconformity in the section developed during the latest Turonian to early Coniacian. Deposition in the Redding region was restricted to shelf environments and may have been controlled partly by euastatic sea level rise and fall. Initial transgression was directed northward and eastward with turonian strata accumulating across the basin. After the early coniacian hiatus, maximum marine inundation occurred briefly during the Santonian. Then late Santonian conglomerates and sandstones of the highest member prograded rapidly across the basin from the north, and shoaling apparently followed shortly thereafter. The southern limit of these late Santonian conglomerates appears to be the Tuscan Springs region where theymore » interfinger with deep shelf mudstones of the Chico Formation. These mudstones are considered to reflect an eastward swing of the Santonian shoreline around the northern Sierra Nevada. Thus, by the late Santonian, deposition had ceased in the Redding region but continued in a narrow trough to the south and southeast. The observed stratigraphy suggests that a thick sequence of Upper Cretaceous clastics beneath the southern Modoc Plateau is unlikely.« less
Marine transgression
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Cenomanian
Carbonate platform
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Sequence Stratigraphy
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Using 2D seismic data and well logs from the Kribi-Campo subbasin in the south Cameroon margin, we have analyzed the postrift succession with the aim of deriving a chronostratigraphic chart and identifying stratigraphic traps. The Kribi-Campo subbasin related to the rifting between Africa and South America could be divided into a structurally complex eastern depocenter and a relatively less disturbed western depocenter in which a break-up unconformity approximately 107.5 Ma underlined the beginning of postrift history. We have used the modern concepts of sequence stratigraphy to identify and characterize seven second-order (SS1, SS2, SS3, SS4, SS5, SS6, and SS7) sequences and one third-order (SS8) sequences grouped into three megasequences (A, B, and C) from Albian to Recent. Sequence 1 (Albian-Cenomanian) was characterized by a retrogradation overlying a lowstand progradational pattern. The SS2 (Campanian-Maastrichtian) and SS3 (Maastrichtian) sequences were deposited during a highstand normal regression. From Paleocene to Eocene, the deposition of sequences SS4–SS5 was controlled by the development of submarine fan turbiditic system related to a forced regression of coastline. From the Middle Miocene to Recent age, the SS6, SS7, and SS8 sequences have been characterized by the development of sigmoidal-oblique clinoforms of a deltaic system well observed in the northern part of the study area. We have studied a new undocumented phase of forced regression of Mio-Pliocene in age within the postrift sequence SS7. The forced regression phases are associated with the Paleogene and Neogene uplift. Relative sea-level curves were constructed and compared with the existing published curves. The processes involved in the formation of these sequences were interpreted as a combination of tectonics, sediment supply, and sea-level changes. Potential reservoirs embedded within the sequences include channel fill, shingled turbidites, slope fan, and basin-floor fan complex.
Paleogene
Cenomanian
Sequence Stratigraphy
Neogene
Chronostratigraphy
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Cenomanian
Sequence Stratigraphy
Aptian
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Passive margin
Neogene
Cenomanian
Sequence (biology)
Sequence Stratigraphy
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Cenomanian
Onlap
Sequence Stratigraphy
Massif
Sequence (biology)
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