182:
43:
210:
31:
113:, dust and other fine-grained material by the wind and intermittent rain, leaving the larger fragments behind. The larger fragments are shaken into place through the forces of rain, running water, wind, gravity, creep, thermal expansion and contraction, wetting and drying, frost heaving, animal traffic, and the Earth's constant
169:
in the lava flows, building up with exposure time. The helium-3 dates show that the lava stones in the desert pavement at Cima Dome have all been at the surface the same amount of time as the solid lava flows right next to them. He wrote in a July 1995 article in
201:. Desert varnish is a thin coating (patina) of clays, iron, and manganese on the surface of sun-baked boulders. Micro-organisms may also play a role in their formation. Desert varnish is also prevalent in the Mojave desert and Great Basin geomorphic province.
129:
A second theory supposes that desert pavements form from the shrink/swell properties of the clay underneath the pavement; when precipitation is absorbed by clay it causes it to expand, and when it dries it cracks along planes of weakness. Over time, this
149:
flows are covered by younger soil layers, with desert pavement on top of them, made of rubble from the same lava. The soil has been built up, not blown away, yet the stones remain on top. There are no stones in the soil, not even gravel.
117:
vibrations. The removal of small particles by wind does not continue indefinitely, because once the pavement forms, it acts as a barrier to resist further erosion. The small particles collect underneath the pavement surface, forming a
177:
For the geologist, this discovery means that some desert pavements preserve a long history of dust deposition beneath them. The dust is a record of ancient climate, just as it is on the deep sea floor and in the world's ice caps.
519:
Processes of vesicular horizon development and desert pavement formation on basalt flows of the Cima
Volcanic Field and alluvial fans of the Avawatz Mountains Piedmont, Mojave Desert, California
174:
that he concluded, "stone pavements are born at the surface." While the stones remain on the surface due to heave, deposition of windblown dust must build up the soil beneath that pavement.
134:
action transports small pebbles to the surface, where they stay through lack of precipitation that would otherwise destroy the pavement by transport of the
391:
McFadden, L.D., Wells, S.G. and
Jercinovich, M.J. 1987. "Influences of aeolian and pedogenic processes on the origin and evolution of desert pavements",
580:
406:
109:
Several theories have been proposed for the formation of desert pavements. A common theory suggests that they form through the gradual removal of
512:
The influence of long-term landscape stability on flood hydrology and geomorphic evolution of valley floor in the northeastern Badin of Jordan
554:
The role and significance of the Gobi desert pavement in controlling sand movement on the cliff top near the
Dunhuang Magao Grottoes
153:
Researchers can determine how many years a stone has been exposed on the ground. Wells used a method based on cosmogenic
495:
376:
368:
433:
193:, a dark brown, sometimes shiny coating that contains clay minerals. In the US a famous example can be found on
437:
407:"Cosmogenic He surface-exposure dating of stone pavements: Implications for landscape evolution in deserts"
595:
232:
342:
17:
473:
East, J.J. 1889. "On the geological structures and physical features of
Central Australia",
141:
A newer theory of pavement formation comes from studies of places such as Cima Dome, in the
421:
8:
314:
224:
Stony deserts may be known by different names according to the region. Examples include:
425:
605:
296:
299: – Sideways spreading in the Earth's crust, a mechanism of surface rock formation
491:
372:
284:
145:
of
California, by Stephen Wells and his coworkers. At Cima Dome, geologically recent
119:
547:
Estimating the fine soil fraction of desert pavements using ground penetrating radar
600:
429:
87:
540:
ynamical processes on desert pavements and the healing of surficial disturbance
475:
Transactions and
Proceedings and Report of the Royal Society of South Australia
302:
290:
270:
194:
190:
95:
79:
35:
460:
Dorn, R. I. and T. M. Oberlander, 1981, "Microbial Origin of Desert
Varnish,"
589:
214:
142:
131:
91:
47:
181:
404:
261:
123:
114:
42:
161:
bombardment at the ground surface. Helium-3 is retained inside grains of
218:
158:
323: – Rock that has been eroded by wind-driven sand or ice crystals
320:
235:
228:
101:
Geologists debate the mechanics of pavement formation and their age.
78:
surface covered with closely packed, interlocking angular or rounded
30:
166:
154:
162:
209:
568:
Desert pavement evolution: An example of the role of sheetflood
552:
Qu
Jianjun, Huang Ning, Dong Guangrong and Zhang Weimin. 2001.
308:
135:
83:
75:
434:
10.1130/0091-7613(1995)023<0613:CHSEDO>2.3.CO;2
198:
146:
110:
528:. Annual Review of Earth and Planetary Sciences 36:97-119.
405:
Wells S.G.; McFadden L.D.; Poths J.; Olinger C.T. (1995).
311: – Desert landscape with mostly rock instead of sand
305: – Broad area of desert covered with wind-swept sand
293: – Orange-to-black rock coating in arid environments
249:
is also used to describe ecological communities, such as
521:. Doctoral thesis, University of California, Riverside.
545:
Meadows, D.G., Young, M.H. and McDonald, E.V. 2006.
365:
Geology
Underfoot: In Death Valley and Owens Valley
46:Desert pavement showing wind scour on the cobbles;
38:on the pebbles; gibber plains of central Australia
526:The history and nature of wind erosion in deserts
490:, Presses universitaires de France, Paris, 1982.
98:collects on the exposed surface rocks over time.
587:
535:, fifth edition. Freeman and Company. 458–460.
398:
189:Desert pavement surfaces are often coated with
514:. Doctoral thesis, University of Nevada, Reno.
556:. Journal of Arid Environments 48(3):357-371.
566:Williams, S.H. and Zimbelman, J.R. 1994.
570:. The Journal of Geology 102(2):243-248.
264:, a vast stony desert plain is known as
208:
180:
41:
29:
563:. The Lapidary Journal 33(7):1648-1650.
335:
274:, which refers to a sandy desert area.
14:
588:
287: – Processes due to wind activity
227:Gibbers: Covering extensive areas in
362:
317: – Particle transport by fluids
549:. Vadose Zone Journal 5(2):720-730.
538:Haff, P.K. and Werner, B.T. 1996. D
24:
542:. Quaternary Research 45(1):38-46.
25:
617:
574:
561:Deflation armor (desert pavement)
369:Mountain Press Publishing Company
343:"Hamada, Reg, Serir, Gibber, Saï"
138:or excessive vegetative growth.
581:Desert Processes Working Group
480:
467:
454:
385:
356:
204:
13:
1:
504:
488:Géographie des régions arides
213:The desert known as Reg de l'
255:Gibber Transition Shrublands
238:are desert pavements called
104:
27:Type of desert earth surface
7:
277:
268:. This is in contrast with
10:
622:
345:. Springer Reference. 2013
251:Gibber Chenopod Shrublands
531:Grotzinger, et al. 2007.
233:Tirari-Sturt stony desert
185:Desert pavement evolution
90:size. They typically top
328:
34:Desert pavement showing
74:(in central Asia) is a
363:Sharp, Robert (1997).
221:
186:
51:
50:of southern California
39:
517:Anderson, K.C. 1999.
510:Al-Qudah, K.A. 2003.
367:. Missoula, Montana:
242:after the pebbles or
231:such as parts of the
212:
184:
66:(in eastern Sahara),
62:(in western Sahara),
45:
33:
486:Jean Dresch et al.,
371:. pp. 119–130.
559:Rieman, H.M. 1979.
533:Understanding Earth
524:Goudie, A.S. 2008.
426:1995Geo....23..613W
315:Saltation (geology)
126:(designated "Av").
70:(in Australia), or
297:Eduction (geology)
222:
187:
52:
40:
596:Aeolian landforms
285:Aeolian processes
157:, which forms by
16:(Redirected from
613:
498:
484:
478:
471:
465:
458:
452:
451:
449:
448:
442:
436:. Archived from
411:
402:
396:
389:
383:
382:
360:
354:
353:
351:
350:
339:
197:in southeastern
21:
621:
620:
616:
615:
614:
612:
611:
610:
586:
585:
577:
507:
502:
501:
485:
481:
472:
468:
459:
455:
446:
444:
440:
409:
403:
399:
390:
386:
379:
361:
357:
348:
346:
341:
340:
336:
331:
326:
280:
207:
107:
56:desert pavement
28:
23:
22:
15:
12:
11:
5:
619:
609:
608:
603:
598:
584:
583:
576:
575:External links
573:
572:
571:
564:
557:
550:
543:
536:
529:
522:
515:
506:
503:
500:
499:
479:
466:
453:
420:(7): 613–616.
397:
395:15(6):504-508.
384:
377:
355:
333:
332:
330:
327:
325:
324:
318:
312:
306:
300:
294:
291:Desert varnish
288:
281:
279:
276:
206:
203:
195:Newspaper Rock
191:desert varnish
106:
103:
96:Desert varnish
58:, also called
36:desert varnish
26:
9:
6:
4:
3:
2:
618:
607:
604:
602:
599:
597:
594:
593:
591:
582:
579:
578:
569:
565:
562:
558:
555:
551:
548:
544:
541:
537:
534:
530:
527:
523:
520:
516:
513:
509:
508:
497:
496:2-13-037457-3
493:
489:
483:
476:
470:
464:213:1245-1247
463:
457:
443:on 2016-10-06
439:
435:
431:
427:
423:
419:
415:
408:
401:
394:
388:
380:
378:9780878423620
374:
370:
366:
359:
344:
338:
334:
322:
319:
316:
313:
310:
307:
304:
301:
298:
295:
292:
289:
286:
283:
282:
275:
273:
272:
267:
263:
258:
256:
252:
248:
245:
241:
240:Gibber Plains
237:
234:
230:
225:
220:
216:
211:
202:
200:
196:
192:
183:
179:
175:
173:
168:
164:
160:
156:
151:
148:
144:
143:Mojave Desert
139:
137:
133:
127:
125:
121:
116:
112:
102:
99:
97:
93:
92:alluvial fans
89:
85:
82:fragments of
81:
77:
73:
69:
65:
61:
57:
49:
48:Mojave Desert
44:
37:
32:
19:
567:
560:
553:
546:
539:
532:
525:
518:
511:
487:
482:
474:
469:
461:
456:
445:. Retrieved
438:the original
417:
413:
400:
392:
387:
364:
358:
347:. Retrieved
337:
269:
265:
262:North Africa
259:
254:
250:
246:
243:
239:
226:
223:
188:
176:
171:
152:
140:
128:
124:soil horizon
115:microseismic
108:
100:
71:
67:
63:
59:
55:
53:
205:Local names
590:Categories
505:References
447:2016-02-23
349:2013-05-23
219:Mauritania
159:cosmic ray
132:geomorphic
606:Sediments
477:12:31-53.
321:Ventifact
236:ecoregion
229:Australia
120:vesicular
105:Formation
278:See also
244:gibbers.
172:Geology,
167:pyroxene
155:helium-3
601:Deserts
462:Science
422:Bibcode
414:Geology
393:Geology
163:olivine
494:
375:
309:Hamada
247:Gibber
136:clasts
88:cobble
84:pebble
76:desert
68:gibber
18:Gibber
441:(PDF)
410:(PDF)
329:Notes
215:Adrar
64:serir
492:ISBN
373:ISBN
199:Utah
165:and
147:lava
111:sand
86:and
80:rock
430:doi
303:Erg
271:erg
266:reg
260:In
253:or
217:in
72:saï
60:reg
592::
428:.
418:23
416:.
412:.
257:.
122:A
94:.
54:A
450:.
432::
424::
381:.
352:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.