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all geography including DSDP/ODP Sites and Legs
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Invertebrata
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Constraining depth to basement for mineral exploration using microtremor: A demonstration study from remote inland Australia Available to Purchase
Polyphase Neoproterozoic orogenesis within the East Africa–Antarctica Orogenic Belt in central and northern Madagascar Available to Purchase
Abstract Our recent geological survey of the basement of central and northern Madagascar allowed us to re-evaluate the evolution of this part of the East Africa–Antarctica Orogen (EAAO). Five crustal domains are recognized, characterized by distinctive lithologies and histories of sedimentation, magmatism, deformation and metamorphism, and separated by tectonic and/or unconformable contacts. Four consist largely of Archaean metamorphic rocks (Antongil, Masora and Antananarivo Cratons, Tsaratanana Complex). The fifth (Bemarivo Belt) comprises Proterozoic meta-igneous rocks. The older rocks were intruded by plutonic suites at c. 1000 Ma, 820–760 Ma, 630–595 Ma and 560–520 Ma. The evolution of the four Archaean domains and their boundaries remains contentious, with two end-member interpretations evaluated: (1) all five crustal domains are separate tectonic elements, juxtaposed along Neoproterozoic sutures and (2) the four Archaean domains are segments of an older Archaean craton, which was sutured against the Bemarivo Belt in the Neoproterozoic. Rodinia fragmented during the early Neoproterozoic with intracratonic rifts that sometimes developed into oceanic basins. Subsequent Mid-Neoproterozoic collision of smaller cratonic blocks was followed by renewed extension and magmatism. The global ‘Terminal Pan-African’ event (560–490 Ma) finally stitched together the Mid-Neoproterozoic cratons to form Gondwana.
Zircon age constraints on the provenance of Llandovery to Wenlock sandstones from the Midland Valley terrane of the Scottish Caledonides Available to Purchase
Upper Llandovery–Wenlock (Silurian) palynology of the Pentland Hills inliers, Midland Valley of Scotland Available to Purchase
The Gaick Fold Complex: large-scale recumbent folds and their implications for Caledonian structural architecture in the Central Grampian Highlands Available to Purchase
Fluvial and aeolian deposition in the Siluro-Devonian Swanshaw Sandstone Formation, SW Scotland Available to Purchase
Palynomorph and ostracod biostratigraphy of the Ballagan Formation, Midland Valley of Scotland, and elucidation of intra-Dinantian unconformaties Available to Purchase
Composition and provenance of the Silurian to Devonian sandstone sequences of the southern Midland Valley Available to Purchase
The Siluro-Devonian evolution of the southern Midland Valley of Scotland Free
Regional gravity and magnetic study of west Texas Available to Purchase
Abstract West Texas is weli suited to a regional gravity and magnetic study, because such data have potential for resolving existing questions regarding the structural relations in this area as well as its tectonic history. In this study, gravity data have been compiled from many sources and analyzed along with aeromagnetic data from the National Uranium Resource Evaluation (NURE) program of the U.S. Department of Energy in an integrated regional study of west Texas. Complete Bouguer gravity-anomaly and total-magnetic-intensity maps and a variety of filtered maps were employed in this analysis. Several basins, such as the Hueco bol-son, Salt basin graben, Marfa basin, Presidio graben, and Valentine basin, can be delineated from the maps, as can interesting positive features associated with the Diablo Plateau, Davis Mountains, and Chalk Draw fault. Deep-seated anomalies were found to be associated with the Delaware basin, Central basin platform, and Ouachita orogenic belt.