Tsarin Amba Aradam

Tsarin Amba Aradam tsari ne na Cretaceous sandstone a Habasha. Ya kai mita 200 a kauri, alal misali a cikin gundumar Degua Tembien .  Kamar yadda burbushin ba su nan, an fassara shekarun Amba Aradam Formation bisa ga shekarun da aka ɗauka daidai da sandstones a wasu wurare a Habasha:  Debre Lebanon Sandstones a cikin Blue Nile Basin, da Upper Sandstone kusa da Harrar a kudu maso gabashin Habasha, duka biyu na Late Cretaceous shekaru (100-66 miliyan da suka gabata).   Lithology na Amba Aradam Formation ya sa ya kasa dacewa da tono cocin dutse; duk da haka an fashe koguna a cikin wannan tsari don zama hedkwatar TPLF a lokacin Yaƙin basasar Habasha na shekarun 1980. 

 Sunan da ma'anar 
Sunan "Amba Aradam Sandstone" ya samo asali ne daga masanin ilimin ƙasa William Thomas Blanford, wanda ya bi sojojin mamaye Burtaniya a 1868. An sanya sunan wannan tsari ne bayan dutsen Amba Aradam, inda aka samu samu yaduwa.[1] Ya zuwa yanzu ba a gabatar da sunan ba don amincewa da Hukumar Kasa da Kasa kan Stratigraphy.

 Yanayin Stratigraphic 
Tsarin Amba Aradam ya mamaye Agula Shale a Imba Aradom  kuma a gabashin Dogu'a Tembien; zuwa yamma, ya kwanta a kan Antalo Limestone sannan a kan Adigrat Sandstone.  Bayan zubar da yashi wanda zai zama Amba Aradam Formation, shirin ya faru. Wannan ya biyo bayan saukar da Tertiary Trap Volcanics . 

 Lithology 
Tsarin Amba Aradam ya ƙunshi fararen ko ja sandstones, da kuma purple zuwa violet siltstones da yumbu. Yankin yashi ya ƙunshi hatsi na quartz, wanda aka yi amfani da ma'adanai na yumɓu da ƙarfe. Wataƙila an ajiye turɓaya a cikin koguna. Ciminti na ƙarfe (laterisation) yana sa ɓangaren sama na tsari ya fi wuya, ya fi nauyi kuma kusan impermeaves ga ruwa. A cikin gida, conglomerates suna faruwa.

 Hoton samfurin dutse 

 Yankin ƙasa 
Baya ga Imba Aradom, an samo asali ne a kan tuddai a arewacin Imba Alaje, kuma musamman a cikin gundumar Dogu'a Tembien, duk a Yankin Tigray na Habasha.

 Geomorphology na yanzu na Amba Aradam Formation 
Mesas na Amba Aradam Formation, a cikin gida tare da murfin dutsen wuta, suna da sauyawa na gangaren da ke da tsawo da gajerun sassan matsakaici saboda sauyawa na gadaje na sandstone da yadudduka na ƙananan yumbu ko siltstone. Tsarin ba shi da tsaunuka masu tsawo kamar Adigrat Sandstone. Yankin saman ƙarfe na tsari duk da haka tsaunuka masu tsawo, wanda zai iya zama sama da mita 10 (33  tsawo. Wadannan yadudduka ma ba su da ruwa, wanda ke haifar da layin bazara a gefen dutsen Amba Aradam.

 koguna da aka yi amfani da su a matsayin hedkwatar a lokacin yakin basasar Habasha 
A cikin shekarun 1980s, a lokacin yakin basasa, kungiyar Tigray People's Liberation Front (TPLF) ta tono wani kogo a cikin sandstones na Amba Aradam Formation, ta amfani da dinamite. Wannan kogon yana kusa da ƙauyen Addi Geza'iti, a yammacin Hagere Selam, kuma ya zama ofisoshi ga shugabannin sa, gami da Meles Zenawi da Siye Abraha . Kungiyar Demokradiyyar Jama'ar Habasha (EPDM) ta kafa hedikwatar ta a wani kogo da ke kusa da Melfa. An tsara manyan ayyukan soja daga waɗannan koguna kusan har zuwa nasarar da suka samu a kan gwamnatin Derg a 1991. Ana iya ziyartar koguna biyu a kan alƙawari (saduwa a ofishin gundumar Dogu'a Tembien, Hagere Selam, Tigray). 

 Bayanan da aka ambata