Lanau: Perbedaan antara revisi

Lanau biasanya terbentuk dari pecahnya kristal kuarsa berukuran pasir.<ref>{{cite journal |last= Moss |first= A J |authorlink= |coauthors= Green, P |year= 1975|month= |title= Sand and silt grains: Predetermination of their formation and properties by microfractures in quartz |journal= Australian Journal of Earth Sciences |volume= 22 |issue= 4 |pages= 485–495|doi= 10.1080/00167617508728913}}</ref> Pemecahan secara alami melibatkan pelapukan batuan<ref>{{cite journal |last= Nahon |first= D |authorlink= |coauthors= Trompette, R|year= 1982|month= |title= Origin of siltstones:glacial grinding versus weathering |journal= Sedimentology |volume= 29 |issue= |pages= 25–35|doi= 10.1111/j.1365-3091.1982.tb01706.x}}</ref> dan regolit secara kimiawi maupun pelapukan secara fisik melalui [[embun beku]] (''frost'')<ref>{{cite journal |last= Lautridou |first= J P |authorlink= |coauthors= Ozouf, J C |year= 1982|month= |title= Experimental frost shattering: 15 years of research at the Centre de Geomorphologie du CNRS |journal= Progress in Physical Geography |volume= 6 |issue= |pages= 215–232|doi= 10.1177/030913338200600202}}</ref> dan ''haloclasty''<ref>{{cite journal |last= Goudie |first= A S |authorlink= |coauthors= Viles, H A |year= 1995 |month= |title= The nature and pattern of debris liberated by salt weathering: a laboratory study |journal= Earth Surface Processes and Landforms |volume= 9 |issue= |pages= 95–98|doi= 10.1002/esp.3290090112}}</ref> Proses utama melibatkan [[abrasi]], baik padat (oleh [[gletser]]), cair (pengendapan sungai), maupun oleh [[angin]].<ref>{{cite journal |last= Wright |first= J S |authorlink= |coauthors= Smith, B J; Whalley W B|year= 1998|month= |title= Mechanisms of loess-sized quartz silt production and their relative effectiveness: laboratory simulations |journal= Geomorphology |volume= 23 |issue= |pages= 15–34|doi= 10.1016/S0169-555X(97)00084-6}}</ref> Di wilayah-wilayah setengah kering produksi lanau biasanya cukup tinggi. Lanau yang terbentuk secara glasial (oleh gletser) dalam bahasa Inggris kadang-kadang disebut sebagai ''rock flour'' ("bubuk batu") atau ''stone dust'' ("debu batu"). Secara komposisi mineral, lanau tersusun dari kuarsa dan felspar. <!-- [[Batuan endapan]] yang tersusun dari lanau dikenal sebagai [[batu lanau]]. -->