Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31734.1 |
Development of stratigraphically controlled, eolian-modified unconsolidated gravel surfaces and yardang fields in the wind-eroded Hami Basin, northwestern China | |
Pullen, Alex1; Kapp, Paul2; Chen, Ninghua3 | |
2018-03-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2018 |
卷号 | 130页码:630-648 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | Here, we present a stratigraphic and geo-morphologic study of the northern part of the hyperarid and internally drained Hami Basin, located south of the Tian Mountains in northwestern China. The Hami Basin exposes wind-eroded Neogene sedimentary bedrock and was potentially an important source of atmospheric dust transported by westerly winds and deposited in the northern Pacific Ocean in the past. The northern Hami Basin exposes at least 430 m of subhorizontal (dipping locally < 1 degrees to the south) Neogene strata. The strata consist of interbedded paleosol, siltstone, sandstone, and massive and cross-bedded matrix- and clast-supported pebble conglomerate associated with alluvial-fan to playa deposition. The Neogene strata are sculpted into wide-spread (> 2000 km(2)) but spatially discontinuous fields of megayardangs, separated and locally overlain by spatially extensive (1 x 10(4)-10(6) m(2)) subhorizontal planar surfaces of unconsolidated gravel. These gravel surfaces are topographically tiered and coincide spatially with prominent conglomerate beds within the wind-eroded Neogene stratigraphy. Conversely, the yardang fields developed in finer-grained and presumably more easily eroded intervals of the stratigraphy between the conglomerate beds. Un-consolidated gravels are also exposed within interyardang corridors, on yardang flanks and tops, in Pleistocene-Holocene ephemeral stream channels, and atop fluvial terraces. There is a scarcity of unconsolidated sediment composed of sand- to smaller-sized particles, which implies the basin is sand-starved and/or that near-surface winds are efficient in removing sand and fine-grained sediment from the basin. We suggest that the rate of eolian-dominated downcutting through the heterogeneous lithologies within the Neogene strata was modulated, in part, by the distribution of conglomerate beds. The distribution of conglomerates, which are more abundant in the lower part of the wind-eroded section, would be consistent with initially higher wind erosion rates and a decreasing trend through time as gravel surfaces coalesced, armored the landscape, and suppressed wind deflation. We estimate a minimum vertically integrated average of 178 m of erosion based on the projection of wind-eroded strata within the field area. We infer that the abundance of dark-colored (low-albedo) unconsolidated gravels in the Hami Basin has contributed to its anomalously high land skin temperatures and frequent extreme near-surface wind events. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000427362500015 |
WOS关键词 | EASTERN MOJAVE DESERT ; TIEN-SHAN ; CARBON-DIOXIDE ; DUST-STORM ; NUTRIENT-LIMITATION ; MANTLED MEGARIPPLES ; PEDOGENIC PROCESSES ; CENOZOIC TECTONICS ; ARGENTINEAN PUNA ; STONE PAVEMENTS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24699 |
专题 | 地球科学 |
作者单位 | 1.Clemson Univ, Dept Environm Engn & Earth Sci, Clemson, SC 29634 USA; 2.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA; 3.Zhejiang Univ, Dept Earth Sci, Hangzhou 310027, Zhejiang, Peoples R China |
推荐引用方式 GB/T 7714 | Pullen, Alex,Kapp, Paul,Chen, Ninghua. Development of stratigraphically controlled, eolian-modified unconsolidated gravel surfaces and yardang fields in the wind-eroded Hami Basin, northwestern China[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2018,130:630-648. |
APA | Pullen, Alex,Kapp, Paul,&Chen, Ninghua.(2018).Development of stratigraphically controlled, eolian-modified unconsolidated gravel surfaces and yardang fields in the wind-eroded Hami Basin, northwestern China.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,130,630-648. |
MLA | Pullen, Alex,et al."Development of stratigraphically controlled, eolian-modified unconsolidated gravel surfaces and yardang fields in the wind-eroded Hami Basin, northwestern China".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 130(2018):630-648. |
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