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- W2765720368 abstract "Research Article| October 19, 2017 Development of stratigraphically controlled, eolian-modified unconsolidated gravel surfaces and yardang fields in the wind-eroded Hami Basin, northwestern China Alex Pullen; Alex Pullen † 1Department of Environmental Engineering and Earth Sciences, Clemson University, Clemson, South Carolina 29634, USA †apullen@clemson.edu Search for other works by this author on: GSW Google Scholar Paul Kapp; Paul Kapp 2Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Ninghua Chen Ninghua Chen 3Department of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, 310027, People’s Republic of China Search for other works by this author on: GSW Google Scholar GSA Bulletin (2018) 130 (3-4): 630–648. https://doi.org/10.1130/B31734.1 Article history received: 31 Dec 2016 rev-recd: 26 Jun 2017 accepted: 21 Sep 2017 first online: 19 Oct 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Alex Pullen, Paul Kapp, Ninghua Chen; Development of stratigraphically controlled, eolian-modified unconsolidated gravel surfaces and yardang fields in the wind-eroded Hami Basin, northwestern China. GSA Bulletin 2017;; 130 (3-4): 630–648. doi: https://doi.org/10.1130/B31734.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Here, we present a stratigraphic and geomorphologic 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° 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 widespread (>2000 km2) but spatially discontinuous fields of megayardangs, separated and locally overlain by spatially extensive (1 × 104–106 m2) 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. Unconsolidated 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2765720368 date "2017-10-19" @default.
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- W2765720368 title "Development of stratigraphically controlled, eolian-modified unconsolidated gravel surfaces and yardang fields in the wind-eroded Hami Basin, northwestern China" @default.
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