Ilimin kasa na Jamhuriyar Dominica

Ilimin kasa na Jamhuriyar Dominica
aspect in a geographic region (en)
Bayanai
Ƙaramin ɓangare na	ilmin duwatsu
Fuskar	ilmin duwatsu
Ƙasa	Jamhuriyar Dominika

Tsibirin Hispaniola

ilimin ƙasa na Jamhuriyar Dominica wani bangare ne na ilimin ƙasa na Hispaniola tare da duwatsu da aka kafa daga tsibirai da yawa, wanda suka haɗu da Arewacin Amurka.

Tarihin Geologic, Stratigraphy & Tectonics

Tsofaffin duwatsu a tsibirin sun fara a farkon Cretaceous ta hanyar tsibiri arc plutonism. Kafin aptian, tsibirin ya ɗaga, musamman a gabas, mai yiwuwa saboda karon tsibiri mai aman wuta. Gabaɗaya, an ƙirƙira Hispaniola ne daga ƙananan tsibiri 11 daban-daban. Daga Albian zuwa Campanian, plutonism, metamorphism da volcanism sun fara lokaci guda, suna faruwa a ƙarƙashin ruwa a kan ƙasa mai zurfi. A cikin Campanian an yi karo na biyu na baka. Picrite daga Duarte Complex a tsakiyar Hispaniola an yi la'akari da shi azaman tsibiri mai zafi na Galapagos..

Cordillera ta Tsakiya a tsakiyar tsibirin ta cire peridotite daga tsakiyar Cretaceous a saman mylonite da phyllonite schist shear zone a cikin Maimon Formation. Rashin daidaituwa ya bayyana a cikin duwatsu a arewa, har zuwa dutsen wuta da Los Ranchos Formation. An rufe su da dutsen Albian-Cenomanian.

Cenozoic (shekaru miliyan 66 da suka gabata-ya zuwa yanzu)

A cikin Paleogene a farkon Cenozoic, volcanism, metamorphism da plutonism sun ci gaba da karkashin ruwa har zuwa Eocene, har yanzu suna da yawa a ƙarƙashin ruwa. Koyaya, a tsakiyar Eocene, tsibirin tsibirin da aka haɗu sun haɗu da gefen kudancin Arewacin Amurka a dandalin Florida-Bahama, wanda ya haifar da samar da carbonates masu yawa da ƙarshen dutsen wuta da plutonism. Dutsen tsibirin ya fallasa sama da layin ruwa kuma ya fara lalacewa yayin da kuskuren gabas da yamma ya fito. Daga Miocene zuwa 'yan kwanakin nan, kuskuren saukowa ya samo asali ne tare da sutures tsakanin tsoffin tsibirin tsibirin yayin da tsibirin ya matsa da Arewacin Amurka da tsaunuka na teku. An kafa manyan tsaunuka guda tara.

A cikin Jamhuriyar Dominica, tsakiyar Cordillera ta Arewa ta mamaye iyakar lalacewar fashewa tsakanin farantin Arewacin Amurka da Caribbean. Kuskuren da ninka daga Eocene" id="mwMA" rel="mw:WikiLink" title="Paleocene">Paleocene zuwa Pliocene a cikin duwatsun ruwa suna nuna tarihin tasowa, wanda ya fara a cikin Eocene pelagic carbonates. Transpression a cikin Miocene-Pliocene ya haifar da anticline a cikin carbonates na ruwa mai zurfi.

Ilimin albarkatun kasa

Babban ajiyar zinare na Pueblo Viejo oxide ya samo asali ne saboda zinariya, quartz da pyrophyllite a cikin wani karamin kwandon a cikin Los Ranchos Formation. A cikin kwandonsa, tsari yana da conglomerate, yana hawa zuwa sandstone da carbonstone tare da burbushin shuke-shuke da ke nuna kusanci da ƙasa. Hanyoyin da aka cika da ƙarfe saboda wurin hydrothermal.

Dubi kuma

• Jerin tsibirai na Jamhuriyar Dominica