Nubbin (ƙasa)
 Nubbin (ƙasa) |
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A cikin ilimin ƙasa nubbin ƙaramin tudu ne mai laushi wanda ya ƙunshi ainihin dutse wanda ke cike da tubalan da suka rage.[1][2] Blok din sun samo asali ne daga rushewar dutse da aka rushe. Musamman ana zaton cewa duwatsun nubbins sune raguwa kwarangwal guda ɗaya ko biyu da ke ƙarƙashin ƙasa - kodayake wasu yanayi na iya ci gaba da faruwa da zarar an fallasa duwatsun a saman.[1]
Nubbins suna samuwa a cikin irin wannan hanyar zuwa castle koppies da bornhardts, kuma ana iya ganin siffofin ƙasa guda uku a matsayin maganganu daban-daban na wannan abin mamaki.[1][3] Nubbins suna faruwa sau da yawa a cikin ƙungiyoyi masu tsari.[1]
Ana iya samun Nubbins a wurare masu zafi da yanayin zafi. A cewar masanin ilimin ƙasa C. R. Twidale wannan shine yanayin da yawancin nubbins ke samuwa. Nubbins a waje da zafi ko yanayi mai zafi sune siffofin ƙasa da aka kafa a cikin zafi da na wurare masu zafi ko kuma a wuraren da ke da zafi sosai. Misalan yankuna tare da nubbins sun haɗa da Kudu maso yammacin Amurka, MacDonnell Ranges a Tsakiyar Ostiraliya da Namaqualand a Kudancin Afirka.[4]
Duk da yake nubbins yawanci an yi su ne da dutse akwai kuma rahotanni na nubbins da aka yi da ignimbrite.[5]
Duba kuma
[gyara sashe | gyara masomin]- Grus (geology) - Yankin yashi da raguwar dutse tarawa
- Inselberg - Tsayawa, dutsen dutse mai tsawo a kan fili mai faɗi
- Saprolite - Dutse mai cike da sinadarai
Manazarta
[gyara sashe | gyara masomin]- 1 2 3 4 Twidale, C.R. (1995). "Bornhardts, Boulders and Inselbergs". Cadernos do Laboratorio Xeolóxico de Laxe. 20: 347–380.
- ↑ Mateo Gutiérrez. Missing
|author1=(help); Missing or empty|title=(help) - ↑ Withers, P.C. (2000). "Overview of granite outcrops in Western Australia" (PDF). Journal of the Royal Society of Western Australia. 83: 103–108. Archived from the original (PDF) on 2023-03-05. Retrieved 2025-08-02.
- ↑ Twidale, C.R. (1995). "Bornhardts, Boulders and Inselbergs". Cadernos do Laboratorio Xeolóxico de Laxe. 20: 347–380.
- ↑ Jorge Rabassa. Cliff Ollier.