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Search Results: 1 - 10 of 37582 matches for " P/T boundary "
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The importance of Hindeodus parvus (Conodonta) for the definition of the Permian-Triassic boundary and evaluation of the proposed sections for a global stratotype section and point (GSSP) for the base of the Triassic
Heinz W. Kozur,Anton Ramov?,Cheng-yuan Wang,Yurij D. Zakharov
Geologija , 1995,
Abstract: The biostratigraphic Permian/Triassic (P/T) boundary is defined by the first appearance of H. parvus. The first appearance of H. parvus within the dine H. latidentatus-H. parvus is a globally recognizable event in the conodont evolution.The first appearance of H. parvus is not facies related and can be observed both in ammonoid-free shallow-water deposits and in ammonoid-bearing pelagic deposits. H. parvus is a common, easily determinable species known so far from the entire Tethys, Japan, western North America, Boreal realm (Greenland)and the Tethyan margin of Gondwana. H. parvus is the first species withworld-wide distribution to appear after the absolute minimum in the faunal diversity indicated by the minimum in The Meishan section (South China) contains a continuous, pelagic sedimentaryrecord across the P/T boundary without stratigraphie gaps. It is nearly unaltered thermally (CAI = 1-1.5). Its fossil content (ammonoids, conodonts, foraminifers,bivalves, brachiopods, sporomorphs etc.) and event succession have been thoroughlystudied. Absolute age and magnetostratigraphy have also been subjected to intensive studies. The section is readily accessible and under protection of the government. This section is best suitable as a global stratotype section and point (GSSP) for the base of the Triassic. No other section in the world is known tobe qualified for defining the P/T boundary in a GSSP. H. parvus made its earliest appearence in the middle part of Boundary Bed 2 (Bed 27) at Meishan. It evolved within Bed 27 from H. latidentatus within a phylomorphogenetic continuum in a continuous and monofacial stratum. The biostratigraphic P/T boundary lies very close to the event boundary (15 cm above the event boundary at the baseof Boundary Bed 1 = Bed 25, and a few centimetres above the minimum in '13C in the lower Boundary Bed 2).
DISCOVERY OF PARAMORPH OF HIGH-QUARTZ IN THE STRATOTYPE SECTION OF THE PERMIAN-TRIASSIC BOUNDARY AT MEISHAN OF CHANGXING, ZHEJIANG, AND ITS SIGNIFICANCE

科学通报(英文版) , 1989,
Abstract:
Stratigraphy of Upper Permian and Lower Triassic Strata of the iri Area (Slovenia)
Tea Kolar-Jurkov?ek,Bogdan Jurkov?ek,Dunja Aljinovi?,Galina P. Nestell
Geologija , 2011,
Abstract: The paper deals with the stratigraphy of Late Permian and Early Triassic strata of the Luka section in the iri area of western Slovenia. This is the only section presently known in the External Dinarides where the Permian-Triassic boundary is defined following international criteria based on the first appearance of the conodont Hindeodus parvus. The following lithostratigraphic units have been formalized: the Bellerophon Limestone and Evaporite-dolomite Members of the Bellerophon Formation and the Luka~ Formation with the three members,the Transitional Beds, Streaky Limestone and Carbonate-clastic Member. The paper presents the results of micropaleontologicalstudy based on foraminifers and conodonts as well as petrographic and sedimentologic research results. The investigation of conodont assemblages enabled the conodont biozonation of the Permian-Triassic interval of the studied Luka section.
Younger Paleozoic, Mesozoic and Tertiary oolitic and oncolitic beds in Slovenia – An Overview
Stevo Dozet,Bojan Ogorelec
Geologija , 2012,
Abstract: Oolitic and oncoidal rocks, microfacies, depositional environments and their stratigraphic ranges in Sloveniaare subjects of this article. Various types of calcareous ooids are present in the Upper Carboniferous, Permian andTertiary (Paleocene and Miocene) beds and specially at many levels in an up to 6000 meters thick statigraphic successionof the Mesozoic age. Sedimentological investigations have been carried out specially in the Triassic andJurassic beds. The ooids occurring in the shallow-water and intertidal carbonate environment have been groupedinto seven types and oncoids into four types. Oncoids are rather more aboundant in Carnian and Norian/Rhaetianage. Late dolomitization of some oolitic beds is next to cementation the main diagenetic feature.
带p(t)-Laplacian算子的分数阶微分方程共振无穷多点边值问题解的存在性
Existence of solutions for p(t)-Laplacian fractional infinite-point boundary value problems at resonance

张迪,刘文斌
ZHANG Di
, LIU Wen-bin

- , 2017, DOI: 10.6040/j.issn.1671-9352.0.2017.312
Abstract: 摘要: 讨论了一类带p(t)-Laplacian算子的分数阶微分方程共振无穷多点边值问题,通过对非线性项的合理控制,利用Mawhin连续定理得到了解的存在性。
Abstract: By using Mawhins continuation theorem, through the reasonable control of the nonlinear term, an existence result for the solutions of fractional infinite-point boundary value problems at resounce with p(t)-Laplacian operator is presented
Existence Theorem about Triple Positive Solutions for a Boundary Value Problem with p-Laplacian  [PDF]
Bo Sun
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.61004
Abstract:
In this paper, by applying a fixed point theorem to verify the existence of at least three positive solutions to a three-point boundary value problem with p-Laplacian. The interesting point is the nonlinear term is involved with the first-order derivative explicitly.
STUDY OF CHEMICAL SPECIES OF ANOMALOUS IRIDIUM IN CRETACEOUS-TERTIARY (K-T) BOUNDARY CLAY LAYER~*

科学通报(英文版) , 1991,
Abstract:
Weak solutions for the p-Laplacian with a nonlinear boundary condition at resonance
Sandra Martinez,Julio D. Rossi
Electronic Journal of Differential Equations , 2003,
Abstract: We study the existence of weak solutions to the equation $$ Delta_p u = |u|^{p-2} u+f(x,u) $$ with the nonlinear boundary condition $$ | abla u|^{p-2} frac{partial u}{partial u} = lambda |u|^{p-2} u -h(x,u),. $$ We assume Landesman-Lazer type conditions and use variational arguments to prove the existence of solutions.
A free boundary problem for the p-Laplacian: uniqueness, convexity, and successive approximation of solutions
A. Acker,R. Meyer
Electronic Journal of Differential Equations , 1995,
Abstract: classical solution of a Bernoulli-type free boundary problem for the $p$-Laplace equation, $ 1 < p < infty $. In addition, we prove the existence of a classical solution in $N$ dimensions when $p = 2$ and, for $ 1 < p < infty $, results on uniqueness and starlikeness of the free boundary and continuous dependence on the fixed boundary and on the free boundary data. Finally, as an application of the trial free boundary method, we prove (also for $ 1 < p < infty $) that the free boundary is convex when the fixed boundary is convex.
Positive Solutions for a Boundary Value Problem with a Derivative Argument  [PDF]
Bo Sun
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.14014
Abstract:

In this paper, several existence results of multiple positive solutions are obtained for a boundary value problem with p-Laplacian, by applying a fixed point theorem in cones. The interesting point is that the nonlinear term f is involved with the first-order derivative explicitly.

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