...Sheng Zhu; Li Wu; Qingjun Zuo; Lin Jia; Guangjin Liu; Donghao Pan Cretaceous siltstone, which is widely distributed in the Yichang region, is a type of soft rock characterized by its low strength and its susceptibility to softening and disintegration when exposed to water. To gain a better...

... mixed layer and by accelerating the burial of shells into a sequestration zone (SZ), allowing them to bypass the uppermost taphonomically active zone (TAZ). However, bioturbation can increase shell disintegration concurrently, neutralizing the positive effects of mixing on time averaging. Bioirrigation...

...X. W. Zhang; L. W. Kong; J. J. Li Abstract Basalt residual soil shows significant disintegration owing to climatic influence. Most existing studies on disintegration of earth materials focus on rocks, with minimal attention given to soils, and do not consider climatic impact. To investigate...

...ABDUL SHAKOOR; TEJ P. GAUTAM Abstract Clay-bearing rocks exhibit a broad range of disintegration behaviors, with second-cycle slake durability index values from 0 percent for some claystones to nearly 100 percent for some siltstones. This variability comes from their geologic makeup, especially...

... abandonment of agricultural systems associated with disintegration of Classic Maya polities ca. A.D. 800–1000. We used lithological, geochemical, magnetic, and palynological data from sediment cores of Lake Petén Itzá in the Maya Lowlands of northern Guatemala. Sediment core chronology was developed using...

... because standard sieving methods are restricted to aggregates >0.25 mm whereas, with the use of the laser diffraction method, smaller aggregates can be measured. The energy delivered to the aggregates in the process of aggregate disintegration is more reproducible in the method described here...

...ARPITA NANDI; MICK WHITELAW Abstract Calcareous shale, which is often encountered in construction projects, has a variety of physical and chemical properties that influence disintegration behavior of the rock mass. The diverse behavior of calcareous minerals in shale adds to the complexity...

...Ding Guoyu Abstract The North China Craton (NCC) began to disintegrate completely in the Yanshan Movement period (Jurassic-Cretaceous) forming a great number of NE, NEN, NW and WNW trending faults. Such fault systems have played an important role in the development of tectonics and seismicity...

... in the south passing into turbidites and olistostromes toward a continental slope farther north. This sedimentary and structural evolution reflects the gradual foundering and disintegration of the northwestern continental margin of Gondwana prior to the collisional stage in the late Visean/late Carboniferous...

...Samantha-jane Mugridge; Harvey R. Young Abstract Samples of siliceous shale from the Odanah Member of the Pierre Shale (Late Cretaceous, Campanian) collected from outcrops and gravel bars along the Souris River in southwestern Manitoba undergo disintegration when subjected to cyclic wetting...

...SAMUEL S HARRISON Abstract Frost weathering of glacial till exposed in stream banks, fields, and construction sites in east-central Wisconsin results in extensive disintegration and dehydration of the till. Erosion of the till granules produced by this weathering accounts for much of the stream...

...EDWIN S ROBINSON Abstract Three groups of features including columns and column recesses, projecting plates, and arches result from mechanical disintegration of sandstone cliffs in Zion Canyon, Utah. The disintegration is in part due to frost action, runoff from rain showers, seep and stream...

...E. Perconig Abstract A new apparatus to disintegrate hard rocks for the separation of microfossils is described.... The new method consists of a very rapid displacement of a container in four directions, in such a manner that the fragments contained therein are violently thrown left, right, up...

...Mark Wittels Abstract The structural disintegration characteristics of some selected species of amphiboles were investigated by thermal, x -ray, optical, and chemical methods. Except for some limited cases of fusion all of the reactions involving structural collapse occur in the solid state...