Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Oligo-Miocene"”.
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The oligo-miocene sediments of the Maltese Islands
The Maltese Islands are situated at the south-western end of the Malta-Ragusa Rise, an area characterised by high gravity anomaly values and a ridge-like bathymetrical profile. The Islands lie 50-80km. south of Sicily and 282km. away from the north African coastline.The sedimentary sequence is …
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Investigations on the importance of early diagenetic processes for the mineralogical stabilisation and lithification of heterozoan carbonate assemblages : (Oligo-Miocene, Maltese Islands and Sicily)
… chosen. Here two sections were logged in Olio-Miocene shallow-water carbonates consisting of different kinds of heterozoan assemblages. The study area is very suitable for the investigation of constructive early diagenetic processes, as the rocks were never deeply buried and burial diagenetic …
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Structural geology of South Hadhramaut area Yemen Republic
… present. The dominant structures are related to Oligo-Miocene rifting in the early stages of development of the Gulf of Aden and they overprint Palaeozoic and Mesozoic structures. An area of 170 km by 50 km was mapped at scale of 1:50,000. Landsat images of the whole area, at 1:50,000 and …
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Kinematics and timing of normal faulting in a metamorphic core complex: Grouse Creek Mountains, Utah
… of motion along the MMSZ in Eocene and Late Oligocene to Early Miocene time and motion along the sub-parallel Upper detachment in Middle Miocene time. Eocene fabrics record top-to-the-305 noncoaxial shear and are cut by the Red Butte stock and associated leucocratic dikes and sills. The …
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Structural and stratigraphic relationships between the Numidien formation and underlying formations in the westernmost Mogod Mountains, northern Tunisia
… in water depths less than 2 meters. A probable Oligo-Miocene (?) shelf facies sandstone sequence overlies the Middle to Upper (?) Eocene marls in places. The Oligo-Miocene Numidien formation is part of a deep sea fan complex deposited further to the north and was derived from the African craton. …
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The tectonic evolution of the western Tien Shan
… motion along the TFF commenced at the Oligo-Miocene boundary, facilitating CCW rotation of the Fergana basin and enabling exhumation of the linked horsetail splays. Higher depositional rates (~150 m Myr-1) in the Oligo-Miocene section (Massaget Fm.) of the Fergana basin suggest …
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Evolution and diversity of passerine birds of Australasia
… Riversleigh World Heritage Area, Queensland (Oligo-Miocene and Pliocene), and St Bathans, New Zealand (early Miocene). Many of the newly described fossils represent families previously unknown from these sites, and most are the oldest known representatives of extant passerine families. I …
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Dynamic Topography of the Borborema Province, South America
… 700 m within the Araripe basin, and by emergent Oligo-Miocene marine coastal terraces. It is inferred that sub-plate mantle convective processes play a significant role in generating and maintaining this elevated topography. Crustal velocity structure is constrained using a combination of legacy …
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Diversity, phylogeny and biostratigraphy of diprotodontoids (marsupialia: diprotodontidae, palorchestidae) from the Riversleigh world heritage area
… from any single region in Australia comes from Oligo-Miocene limestone deposits of the Riversleigh World Heritage Area, northwestern Queensland. In this thesis a new diprotodontoid genus and five new species are described from Riversleigh, as well as additional material from Riversleigh for the …
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Geology in the Vicinity of the City of Fossil, Wheeler County, North-Central Oregon
… position of leaf-bearing tufts mapped as Oligo-Miocene John Day Formation but surrounded by andesitic basalts of the Eo-Oligocene Clarno Formation, 2) the age of "olivine basalt" mapped as John Day Formation by some workers but referred to the Clarno Formation by others, and 3) the …
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A seismic study on the structural evolution of the North Celtic Sea Basin, offshore Ireland
… geometry. Subsequent Alpine compression in the Oligo-Miocene and uplift in the Paleocene reactivated and reversed the mid-basin antithetic faults, creating broad mid-basinal anticlines and flower structures. These faults were preferentially reactivated as they detached in Triassic halites. …
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Tectonic implications of mantle source changes recorded by Eocene-Oligocene basalts from the Dillon volcanic field southwest Montana (USA)
Basalts of the Eocene to Oligo-Miocene Dillon volcanic field Montana (U.S.A.) record the change from dominantly compression to extensional tectonics, within the northern Rocky Mountains and accordingly, also present across the North American Cordillera. The Dillon volcanic field is composed of …
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Cenozoic potassic magmatism and uplift of the Western United States
… the Western Cordillera. <br></br><br></br>The Oligo-Miocene potassic-ultrapotassic lamprophyres of the Navajo Volcanic Field, Colorado Plateau, and the late Miocene-Pliocene shoshonites of the San Joaquin- Kings Volcanic Field, Sierra Nevada, represent primary or near primary mantle-derived …
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Paleo-environmental conditions and tectonic settings of cretaceous-tertiary kaolins in the Eastern Dahomey and Niger Delta Basins in Nigeria.
… between the Ediacaran Period (645 – 541 Ma) and Oligo – Miocene age for the Tertiary kaolins. The Nigerian and Brazilian Cretaceous kaolins formed under similar warm tropical paleoclimate. The study corroborated the occurrence of the Eburnean (Transamazonian) and Pan African (Brasiliano) orogenic …