Shape and Nature of Small Sedimentary Quartz Particles

  title={Shape and Nature of Small Sedimentary Quartz Particles},
  author={David h. Krinsley and Ian Smalley},
  pages={1277 - 1279}
Quartz particles in sediments become flatter with decreasing size; a cleavage mechanism may operate below the critical size of about 100 microns. Flat particles would tend to form a more open packing than spherical particles, and this may contribute to the collapse of loess and similar soils and the sudden loss of strength observed in "sensitive" clay soils. 
Quartz particles are released into the sedimentary system by the weathering and fracture of granitic rocks. These quartz particles contain micorfractures which influence their subsequent breakage.
Fabric, composition and properties of sensitive soils from Canada, Alaska and Norway
Abstract The fabric and mineralogical composition of sensitive soils from widely separated parts of the world is qualitatively similar. The fabric is open but more complex than predicted
Processes of debris comminution in the glacial environment and implications for quarts sand-grain micromorphology
Abstract Studies of till composition, rock crushing and abrasion experiments, and detailed consideration of the mechanics of the comminution processes which occur in the subglacial environment
Controls on the nature of loess particles and the formation of loess deposits
Abstract The story (history) of a single loess particle can be told from the formation of the planet to the making of bricks. The modal loess particle chosen for study is a 30 μm quartz particle.
Significance and origin of surface textures on broken sand grains in deep‐sea sediments
The surface textures of fine sand particles from the Deep Sea Drilling Project Leg 39 have been studied via scanning electron microscopy. A large portion of the coarsest fraction of these grains from
Eolian sedimentation on Earth and Mars: Some comparisons
Abstract Eolian sediments on Earth are mostly formed from quartz; they consist, in large part, of eolian sand deposits in deserts, silt and loess deposits in and adjoining present and former
Size distribution of quartz in mudrocks
Sixteen penecontemporaneously deposited mudrock-sandstone pairs ranging in age from Devonian to Cretaceous were treated chemically to isolate the quartz and chert fraction from the other constituents
Size and shape of fine quartz in the clay fraction of soils and geological materials
Fine clay fractions of two soils and five geological materials including three formed in late Wisconsinan glacial rock flour were separated by decantation and centrifugation procedures. X-ray
Silt: 2 62 μm, 9 4φ
The particles in finer-grained detrital sediments are usually composed of quartz. They fall into two size grades: sand (2 mm–62 μm) and silt (62 μm–2 μm). These size gradings conceal important
Quickclays as products of glacial action: a new approach to their nature, geology, distribution and geotechnical properties - a reply
Abstract Essentially, quickclays are products of glaciation which accounts for their limited distribution; other modes of development being of lesser importance. Glacial grinding provides the fine


The properties of glacial loess and the formation of loess deposits
ABSTRACT Some loess is produced by direct glacial action. This is a two stage process: the fine quartz which forms the bulk of the loess is produced first as sand-size grains, and then these grains
New High-strength Stainless Steels
A COMMON method of producing high creep strength in metals is to introduce a second, dispersed, phase to act as an obstacle to the motion of dislocations. At large volume fractions of the second
Lung Cancer as an Endocrine Disease
It is found that patients with lung cancer excreted less androsterone (3α-hydroxy-5α-androstan-17-one), compared with its 5β-isomer aetiocholanolone, and more 17-OHcs than normal subjects, which can be used as a diagnostic test for lung cancer with an accuracy of about 90%.
The entropies of transition and fusion (in joules per degree Kelvin per mole) are, for YFs, 24.0 and 19.6 and, for LuFi
  • J. Chem. Phys
  • 1971
The Svstem of Mineralogy
The salts were 99.9 percent pure. The major impurities were other rare-earth elements and References and Notes