Topic
Slab
About: Slab is a research topic. Over the lifetime, 31617 publications have been published within this topic receiving 318693 citations.
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TL;DR: In this paper, major and trace element and isotope (O, Sr, Nd) compositions of the Late Quaternary rocks from the Central Kamchatka Depression (CKD) are used to demonstrate systematic changes in magma genesis along the northern segment of the KamCHATKA Arc, above and north of the subducting Pacific slab edge.
Abstract: New and published major and trace element and isotope (O, Sr, Nd) compositions of the Late Quaternary rocks from the Central Kamchatka Depression (CKD) are used to demonstrate systematic changes in magma genesis along the northern segment of the Kamchatka Arc, above and north of the subducting Pacific slab edge. We envision a number of possible petrologic scenarios for magma generation beneath the CKD and formulate quantitative mass-balance models which lead to three major conclusions departing significantly from previous interpretations of the CKD rocks. First, this study demonstrates that eclogite melts contribute to the composition of virtually all CKD lavas and could be the major agent transferring material from the subducted slab to the mantle wedge, including fluid-mobile elements (e.g., K, Ba). Second, thermal state of the mantle wedge beneath the CKD has primary control on the major composition of primitive magmas, favoring production of low temperature andesitic and dacitic mantle melts toward the slab edge. Third, hydrous slab-fluids might not be required to generate CKD magmatism. Instead, strong enrichment in LILE, high δ 18 O and 87 Sr/ 86 Sr, in some CKD magmas could originate from assimilation of hydrothermally-altered mafic lithosphere. Several concurring factors could facilitate partial melting of the subducting slab beneath the all CKD volcanoes and favor variable modification of the eclogite melts during interaction with the mantle wedge. Large input from slab melting makes CKD magmatism unique in Kamchatka and may contribute to the CKD volcanoes being the most productive arc volcanoes on Earth.
75 citations
TL;DR: In this paper, a reinforced concrete two-way slab with carbon fiber reinforced plastic (CFRP) strips bonded to the tensile face is designed as a three-layered plate and the upper bound theorem of limit analysis is used to approximate the ultimate load capacity and identify different collapse mechanisms.
75 citations
TL;DR: In this article, a mesoscale concrete model is developed to simulate the dynamic failure process of a concrete slab under contact detonation, where the concrete material is assumed to consist of two phases, that is, the high strength coarse aggregates and the low strength mortar matrix, randomly distributed in the structure components.
75 citations
TL;DR: In this article, the authors used the He and Ar isotopic composition of the upper and lower mantle, together with 36 Ar and 40 Ar abundances in the atmosphere, to place limits on the mass flux between the lower and upper mantle when combined with estimates for K, U and Th.
75 citations
TL;DR: In this article, a model for the height of the mixed layer and the depth of the entrainment zone under near-neutral and unstable atmospheric conditions is presented, which is based on the zero-order mixed-layer height model of Batchvarova and Gryning.
Abstract: A model is presented for the height of the mixed layer and the depth of the entrainment zone under near-neutral and unstable atmospheric conditions. It is based on the zero-order mixed-layer height model of Batchvarova and Gryning (1991) and the parameterization of the entrainment zone depth proposed by Gryning and Batchvarova (1994). However, most zero-order slab type models of mixed-layer height may be applied. The use of the model requires only information on those meteorological parameters that are needed in operational applications of ordinary zero-order slab type models of mixed-layer height: friction velocity, kinematic heat flux near the ground and potential temperature gradient in the free atmosphere above the entrainment zone. When information is available on the horizontal divergence of the large-scale flow field, the model also takes into account the effect of subsidence, although this is usually neglected in operational models of mixed-layer height owing to lack of data. Model performance is tested using data from the CIRCE experiment.
75 citations