Litostratigrafia e contexto estrutural do Terreno de Banda e da Sequência Gondwana no Noroeste do Enclave de Oecusse, Timor-Leste

ABSTRACT: The limited geological information of the Oecusse enclave, coupled with its geotectonic complexity, makes it difficult to comprehend its geological context. To better understand the lithostratigraphy and tectonics of the northeastern sector of this territory, a new geological map was created, utilizing the interpretation of remote sensing data and field observations. The studied area consists mainly of the Banda terranes of Asian affinity, which partially correspond to metamorphic rocks, with a Jurassic protolith and mostly Eocene metamorphic age, at the base of the Lolotoe Complex, to deposits with basin facies from the Cretaceous (Palelo Group), associated with shallow water limestones from the Eocene (Dartollu Limestones) and to an Eocene-Pliocene volcanic series (Manamas Group). These units constitute of the thrust pile of a duplex of horse thrusts of Australian affinity (Gondwana Sequence), dominated by shallow-water Triassic silts, clays and carbonates. The roof thrusts have a NW-SE orientation and are linked by left lateral tear faults NE-SW oriented.