Post‐rift stress history of SW Japan inferred from early to middle Miocene intrusions and meso‐scale faults in the Tajima–Myokensan area

Island Arc ◽  
2021 ◽  
Author(s):  
Toshiki Haji ◽  
Atsushi Yamaji
Keyword(s):  
Middle Miocene ◽  
Stress History ◽  
History Of ◽  
Meso Scale ◽  
Sw Japan

scholarly journals Multilocus phylogeny and historical biogeography of Hypostomus shed light on the processes of fish diversification in La Plata Basin

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yamila P. Cardoso ◽  
Luiz Jardim de Queiroz ◽  
Ilham A. Bahechar ◽  
Paula E. Posadas ◽  
Juan I. Montoya-Burgos
Keyword(s):  
Middle Miocene ◽  
Drainage Pattern ◽  
Ecological Diversification ◽  
La Plata ◽  
La Plata Basin ◽  
History Of ◽  
Dispersal Corridors ◽  
Shed Light ◽  
Strong Barrier ◽  
Multilocus Phylogeny

AbstractDistribution history of the widespread Neotropical genus Hypostomus was studied to shed light on the processes that shaped species diversity. We inferred a calibrated phylogeny, ancestral habitat preference, ancestral areas distribution, and the history of dispersal and vicariance events of this genus. The phylogenetic and distribution analyses indicate that Hypostomus species inhabiting La Plata Basin do not form a monophyletic clade, suggesting that several unrelated ancestral species colonized this basin in the Miocene. Dispersal to other rivers of La Plata Basin started about 8 Mya, followed by habitat shifts and an increased rate of cladogenesis. Amazonian Hypostomus species colonized La Plata Basin several times in the Middle Miocene, probably via the Upper Paraná and the Paraguay rivers that acted as dispersal corridors. During the Miocene, La Plata Basin experienced marine incursions, and geomorphological and climatic changes that reconfigured its drainage pattern, driving dispersal and diversification of Hypostomus. The Miocene marine incursion was a strong barrier and its retraction triggered Hypostomus dispersal, increased speciation rate and ecological diversification. The timing of hydrogeological changes in La Plata Basin coincides well with Hypostomus cladogenetic events, indicating that the history of this basin has acted on the diversification of its biota.

Stress history of folding and cleavage development, Baraboo syncline, Wisconsin

1975 ◽  
Vol 86 (12) ◽  
pp. 1671 ◽  
Author(s):  
I.W.D. DALZIEL ◽  
G. L. STIREWALT
Keyword(s):  
Stress History ◽  
History Of

Influence of flood-induced scour on dynamic impedances of pile groups considering the stress history of undrained soft clay

2017 ◽  
Vol 96 ◽  
pp. 76-88 ◽  
Author(s):  
Fayun Liang ◽  
Hao Zhang ◽  
Maosong Huang
Keyword(s):  
Soft Clay ◽  
Pile Groups ◽  
Stress History ◽  
History Of

Structures megametriques et evolution de la mer Tyrrhenienne et des zones perityrrheniennes

1962 ◽  
Vol S7-IV (5) ◽  
pp. 760-773 ◽  
Author(s):  
Claude Grandjacquet
Keyword(s):  
Large Scale ◽  
Middle Miocene ◽  
Southern Italy ◽  
Western Mediterranean ◽  
Tyrrhenian Sea ◽  
African Continent ◽  
Lower Eocene ◽  
Structural History ◽  
History Of

Abstract A large view of the evolution and structural history of the Tyrrhenian sea and bordering areas suggests that towards the end of the Permian distensions occurring in the western Mediterranean resulted in the opening of a passage to the Atlantic. Lower Eocene deformations along the Sicilian-Tunisian front were either due to local marginal disequilibrium or to the northern drift of the African continent. Oligocene emergence is evident in the Apennines and in Calabria through the existence of widespread hiatuses and by bauxitic and ferruginous beds. Large scale Oligocene movements brought the African continent to its maximum proximity with Europe. It was in the same period that the clay scaglia and flysch nappes began sliding in Tuscany although the movement of Calabrian nappes in southern Italy did not occur until the lower and middle Miocene.

Effect of stress history of saturated clay on engineering behaviour of an energy pile

2020 ◽  
pp. 1-10
Author(s):  
Di Wu ◽  
Han-Long Liu ◽  
Gang-Qiang Kong ◽  
Hossam Abuel-Naga
Keyword(s):  
Stress History ◽  
Energy Pile ◽  
Saturated Clay ◽  
History Of

Engineering geology characterization of lacustrine overconsolidated clays in an alpine area of Italy

2000 ◽  
Vol 37 (6) ◽  
pp. 1241-1251
Author(s):  
R Meriggi ◽  
P Paronuzzi ◽  
L Simeoni
Keyword(s):  
Triaxial Compression ◽  
Mechanical Resistance ◽  
Compression Tests ◽  
Stress History ◽  
Depositional Processes ◽  
Geotechnical Characteristics ◽  
Lithostratigraphic Units ◽  
Overconsolidated Clays ◽  
History Of

This study reports the main geotechnical characteristics of the Steggio Clay unit, a lacustrine sequence located in a valley of the Veneto Piedmont area (northern Italy). Analyzing the variations of overconsolidation pressure with depth, and the compressibility characteristics of natural, swelled, and reconstituted samples, one can hypothesize about the existence and influence of swelling processes on the stress history of the deposit. The yield pressures, determined by oedometric tests for the various lithostratigraphic units, are compared with the preconsolidation pressures deduced from the geological analysis, and a reduction in apparent preconsolidation pressures is evident in the upper layers. Comparing the natural water content of each stratigraphic unit with that of the overconsolidated and normally consolidated states, it can be seen that the same layers are softened. These phenomena could have been caused by swelling induced by erosion of the overlying deposits, sliding of glacial masses, and unloading due to deglaciation. The results of undrained consolidated triaxial compression tests indicate that the variations between the parameters of mechanical resistance of some lithological units can be attributed to the different values of the void index, Ivo, corresponding to the lithostatic in situ stress.Key words: overconsolidated clays, stress history, swelling, intrinsic characteristics, post-depositional processes, glaciation.

Determining Preconsolidation Pressure of the Lakeside New District Soft Clay of Hefei Based on Casagrande Method by Matlab

2013 ◽  
Vol 291-294 ◽  
pp. 1113-1116
Author(s):  
Yan Shao ◽  
Chang Yong Li ◽  
Yuan Wei
Keyword(s):  
Soft Clay ◽  
Least Square Method ◽  
Least Square ◽  
Compression Curve ◽  
Stress History ◽  
Important Index ◽  
Preconsolidation Pressure ◽  
Quartic Polynomial ◽  
History Of ◽  
Calculation Parameter

The preconsolidation pressure is an important index to determine the stress history of soil and also a major calculation parameter for the analysis of soil stratum’s deformation in the different stress history. Casagrade method is worldwide applied to determine the preconsolidation pressure. On the basis of research on consolidation test about the lakeside new district soft clay of Hefei by high pressure consolidation apparatus, and conformed to Casagrande method, the paper adopts quartic polynomial and least square method to fit the compression curve, and the preconsolidation pressure of the lakeside new distract soft clay of Hefei is determined by matlab software. The result provides reference for the calculation of foundation settlement considering stress history.

Early and middle Miocene depositional history of the Maracaibo Basin, western Venezuela

AAPG Bulletin ◽  
2006 ◽  
Vol 90 (4) ◽  
pp. 625-655 ◽  
Author(s):  
José I. Guzmán ◽  
William L. Fisher
Keyword(s):  
Middle Miocene ◽  
Depositional History ◽  
Maracaibo Basin ◽  
History Of

scholarly journals On <i>Pseudotaberina malabarica</i> (Carter) <i>(Foraminiferida)</i>

1989 ◽  
Vol 8 (1) ◽  
pp. 113-129 ◽  
Author(s):  
F. T. Banner ◽  
J. Highton
Keyword(s):  
Type Species ◽  
Middle Miocene ◽  
Carbonate Sediments ◽  
Inner Shelf ◽  
History Of

Abstract. Pseudotaberina Eames, 1971, has as its (originally designated) type species Orbitolites malabarica Carter, 1853. The taxonomic and nomenclatural history of P. malabarica is given, and the diagnoses of both the genus and the species are corrected and emended, following re-examination of the type and other relevant specimens. A lectotype is selected and, with syntypes, strict topotypes and other specimens, is used for redescription of the species. P. malabarica is believed to characterise Early to Middle Miocene marine, inner shelf carbonate sediments of Tethys.

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