| 词汇 | varve |
| 释义 | BETA Examples of varvevarve isn’t in the Cambridge Dictionary yet. You can help! Quaternary varves are used in stratigraphy and palaeoclimatology to reconstruct climate changes during the last few hundred thousand years. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Of the many rhythmites found in the geological record, varves are among the most important and illuminating to studies of past climate change. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Of the many rhythmites found in the geological record, varves are one of the most important and illuminating to studies of past climate change. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Similar seasonal patterns also occur in ice cores and in varves (layers of sediment deposition in a lake, river, or sea bed). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Each pair of layers is called a varve and represents one year. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Varves have recently experienced a renaissance as methods and techniques of study have improved, and varves are now regularly used to calibrate radiocarbon timescales. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In addition to seasonal variation of sedimentary processes and deposition, varve formation requires the absence of bioturbation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The mean thickness of a varve here is 0.18 mm, with a minimum thickness of 0.014 mm and maximum of 9.8 mm. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Each band is similar to a varve, to the extent that the banding is assumed to result from cyclic variations in available oxygen. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Such varves in meromictic lakes preserve an historical record something like tree rings do. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Laminae that represent seasonal changes (similar to tree rings) are called varves. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Varve (or "varved clay") is clay with visible annual layers, which form from seasonal differences in erosion and organic content. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. As the varves get closer to the shoreline the clay layer will stay relatively the same thickness, but there will be an increase in thickness of the silt layer. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, international interest in varves diminished. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This naturally occurring anoxic basin allows for sediments to be deposited without bioturbation, forming varves of alternating light and dark color, which correspond to the dry or rainy season. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The varves thus record the change in the lakes' environment around 1800, when the primeval forests in the region were replaced by open fields and farmland. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. At the deep permanent lake stage in a typical cycle there is normally a laminite, consisting of fine-scale alternations of clastic, carbonate and organic laminae, thought to represent annual varves. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. There is a distinct change in the color of the varves that occurred around 1800; the lower, older varves are dark brown, and the higher, younger varves are grey. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The clays show a rhythmical, varve-like layering. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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