Chullkani
Chullkani is a volcano in the Cordillera Occidental in the Andes of Bolivia. It is located in the Oruro Department, Sajama Province, Turco Municipality. It lies near two lower peaks both named Wayna Chullunkhäni. The eastern one called Wayna Chullunkhäni lies at, and the one northwest of Chullkani, also spelled Huayna Chuluncani, lies at at a creek named Wayna Chullkani '.
Activity at Chullkani commenced in the upper Miocene with the cryptodome Ch'ankha Muqu. This lava dome is formed by porphyritic andesite and has dimensions of at an altitude of. Later, southeast of Chullkani formed the rhyolitic Yapu Qullu lava dome. Crystalline flows named Thuwas Qalani ' are up to thick and contain lithic fragments and pumice. Chullkani proper formed 6.13± 0.12 Ma from andesites. Another group of five peaks stretching northeast are lava domes and named Jitiri, Picha Qullu ', Llallawi ', Jach'a K'uchu and Wila Lat'arata. A dacite lava dome named Liyun Ikiña was erupted 6.2±0.4 Ma.
During the Pliocene, fissure eruptions formed the trachytic Pérez Formation which crops out north of Chullkani. In the Wanq'u Jaqhi gorge ', these deposits crop out. Andesitic lavas erupted 2.3±0.2 Ma are named Wichhu Qullu lavas. Another effusive activity generated the Carbón Qullu lavas ' and finally the Pukara lava dome, whose collapse generated the Thuwas Ventilla pyroclastic flow.
