197,295 research outputs found
Evidenze di tettonica distensiva sinsedimentaria nel bacino messiniano della Laga: implicazioni per l'evoluzione dell'Appennino Settentrionale
No full textL'Appennino umbro-marchigiano offre situazioni particolarmente favorevoli per lo studio dei rapporti fra tettonica e sedimentazione. All'interno della catena si riconoscono due importanti province fisiografico-strutturali, l'Appennino umbro-marchigiano s.s. e la fascia pedemontana marchigiana, che rappresentavano rispettivamente la catena e l'adiacente bacino di avanfossa durante il Messiniano. Nell'area compresa fra M. la Speluca e M. Prato, lungo un segmento della linea Olevano-Antrodoco-M. Sibillini, la Formazione della Lçaga, che costituisce il riempimento terrigeno dell'avanfossa messiniana, è interessata da faglie dirette il cui sviluppo ha preceduto la propagazione dei sovrascorrimenti. Il passaggio da distensione a compressione, estremamente rapido (meno di un milione di anni) si è realizzato durante l'intervallo Messiniano superiore-Pliocene inferiore. La presenza di strutture distensive all'interno della Formazione della Laga ha localmente controllato la geometria della superficie di sovrascorrimento di M. la Speluca-M. Prato. La distensione pre-orogenica rappresenta verosimilmente una risposta superficiale ai processi di flessurazione litosferica indotta dalla costruzione della catena e potrebbe aver condizionato la posizione del fronte messiniano del sistema catena-avanfossa-avampaese
Dispersal pathways in the early Messinian Adriatic foreland and provenance of the Laga Formation (Central Apennines, Italy)
No full textThe early Messinian Laga Formation represents a turbidite complex deposited in the Late Neogene foreland basin
system of the growing Apenninic chain. While the stratigraphy and physiography of the Laga Basin are well
known, the source of its sediments is contentiously claimed to be either recycled Apenninic or primary Alpine.
Furthermore, a shift in paleocurrentwas proposed as a marker of provenance change around 6Ma. By combining
double-dating of detrital zircons (fission-track and U-Pb dating) with compositional analyses, the sedimentary
provenance of the lower Laga arenites and differences between the proximal channelized and distal lobe facies
are addressed. Due to sediment sorting processes, the lobe facies shows a reduced heavy mineral spectrum relative
to the channelized facies. Hence, proximal deposits reflect their hinterland lithologies better than their distal
counterpart and should be preferred in provenance analyses. The petrographic composition of the Laga units implies
amajormetamorphic source combinedwith an additional dolomite and carbonate source.No compositional
difference spanning the shift in paleocurrents is observed,which therefore likely reflects the evolving topography
of the foreland due to syn-sedimentary tectonics. Detrital zircon fission-track data reveal youngest age populations
at ~16–17 Ma and lag times in the range of 9 to 11Ma that can be related to modern fission-track ages observed
in the Central Alps. The two major 238U/206Pb age populations, centered at 277.5 and 37.5 Ma, represent
(post-)Variscan events and the Paleogene magmatic activity in the Central Alps, specifically the Adamello complex.
The Central and Southern Alps are thus inferred as the major source for the early Messinian Laga arenites.
The pathways of the sediments from the Alps to the Laga Basin crossed the Alps-Apennines foreland and passed
on the outer Apenninic wedge-top along elongated and tectonically controlled basins and channels that entered
the basin from the north and northwest. The transfer could have been direct along the Apenninic depozones.
Additionally, late Tortonian sediments fromthe Alps could have been temporarily stored on top of the Apenninic
wedge, e.g. in the Marnoso-arenacea Basin, and then seamlessly cannibalized into the Laga Basin
Um afturvirkni laga og ógildingarreglu 36. gr. samningalaga
No full textÍ þessari ritgerð hyggst ég annars vegar kanna grundvöll meginreglunnar um afturvirkni laga og undirstöður hinnar víðtæku ógildingarreglu sml. Hins vegar mun ég takast á hendur það verkefni að gera grein fyrir því hvernig dómstólar hafa í framkvæmd beitt þeim þætti 36. gr. sml. sem heimilar að ógilda samning með afturvirkum hætti og líta til þess hvernig þeim hefur farnast að gæta jafnvægis milli undirstöðuraka áðurgreindrar meginreglu um bann við afturvirkni laga og ógildingarreglunnar.
Í kafla 2 verður gerð grein fyrir uppruna meginreglunnar um bann við afturvirkni laga, hvaða sjónarmið búa að baki reglunni og á hvaða réttarheimildarlega grunni hún hvílir í íslenskum rétti. Í kafla 3 er að finna umfjöllun um 36. gr. sml., þ. á m. aðdraganda að setningu reglunnar, gildissvið hennar og inntak og það hvað greinir hana frá öðrum ógildingarreglum sml. Þar að auki verður vikið sérstaklega að þeim þætti ógildingarreglunnar sem heimilar að litið sé til atvika sem síðar koma til. Í kafla 4 verður leitast við að greina þann þátt ógildingarreglunnar í 36. gr. sml. sem felur í sér afturvirkni laga og gera grein fyrir dómaframkvæmd þar um. Að síðustu verður umfjöllunarefni ritgerðarinnar dregið saman og helstu niðurstöður hennar kynntar í kafla 5
Stratigraphy, structural setting and burial history of the Messinian Laga basin in the context of Apennine foreland basin system
No full textAn integrated approach to the study of the Central Apennines thrust system has been conducted, combining
together new field, geophysical, organic matter maturity and mineralogical datasets. The area comprises one of the most
studied basins of the Central Apennines: the Laga basin. It developed during the Messinian time and represents the link
between the internal, uplifted, Lower Miocene fold-and-thrust belt to the west, and the external, more recent part of the
chain, buried below a thick pile of synorogenic, Plio-Pleistocene clastic deposits of the Periadriatic basin to the east. The Laga
basin is filled by several turbiditic sedimentary sequences, largely studied in the past and mostly included into the Laga
Formation, classically considered the fill of a deep marine foredeep basin connected to the flexure of the subducted Adriatic
lithosphere under the Apennines. Our results clearly suggest that during Messinian, the main factor controlling depositional
system architectures was thrusts activity, which governed the localization of the main depocenter in the basin and its
eastward space-time migration. The occurrence of thrust activity during deposition of most of the Laga basin sedimentary
succession suggests that it can be described as an internally deformed but not migrating sedimentary wedge, having
features recording the transition from foredeep to wedge top depozone
OPTIMASI PERENCANAAN PENINGKATAN KAPASITAS RUAS JALAN LAGA – BAGUIA DISTRIK BAUCAU REPUBLIK DEMOKRAKTIK TIMOR - LESTE
No full textABSTRAK
Frederik Barreto Da Costa Xavier, 2018, Optimasi Perencanaan Peningkatan Kapasitas Ruas Jalan Laga – Baguia Distrik Baucau Sub-Distrik Laga – Baguia Republik Demokratik Timor – Leste, Program Studi S1 Teknik Sipil Fakultas Teknik Sipil Dan Perencanaan Institut Teknologi Nasional Malang, Dosen Pembimbing I : Dr. Ir. Nusa Sebayang, MT, Dosen Pembimbing II : Annur Ma’aruf, ST, MT.
Jalan Laga – Baguia merupakan salah satu jalan yang ada di distrik (Kabupaten) Baucau Timor – Leste. Sub Distrik (Kecamatan) Laga - Baguia mempunyai Panjang jalan menurut kondisi jalan sepanjang 38 km. Kodisi eksisting jalan yang sudah melibihi kapasitas arus lalu lintas dan kodisi lapis kerusakan yang banyak terdapat seperti lubang dan pengelupasan permukaan jalan yang sangat mempengaruhi tingkat pelayanaan jalan.
Data yang digunakan dalam perencanaan peningkatan kapasitas ruas jalan adalah data sekunder yaitu data peta jaringan jalan, kordinat lokasi, CBR, LHR. dan RAB. Metode yang digunakan yaitu Pedoman Geometrik Jalan Bina marga tahun 2021, manual desain Perkerasan (MDP) Tahun 2017 dan perhitungan rencana anggaran biaya mengacu pada harga satuan pekerjaan Timor-Leste tahun 2021-2022. dan menggunakan acuan AHSP tahun 2022.
Hasil perhitungan Perencanaan peningkatan kapasitas ruas jalan Laga – Baguia dengan lebar jalan 6 meter dimana V20 sebesar 0.75 dengan Rasio Q/C = 0.45-0.75 dan panjang jalan 3000 m, dengan Kedalaian medan rata-rata 19,34 % . Maka termasuk jenis medan perbukitan . Pada ruas jalan Laga-Baguia dicoba 3 Alternatif sudah memenuhi faktor Ekonomi, keamanan dan keyamanan sehingan dipilih alternatif 2 dan didapatkan lengkung horizontal dengan jumblah PI sebanyak 8 buah tikungan Full – Circle (F-C) dan 6 buah tikungan Spiral-Circle-Spiral (S-C-S) dan lenkung cembung sebanyak 4, dan cekung sebanyak 2. Dan untuk galian 53,637,59 m^3 Dengan harga satuan Dolar USD. 149,434 Sedangkan Volume Timbunan adalah 48,240,06 m^3 Dengan harga satuan Dolar USD. 249,787 didapatkan jumblah total harga pekerjaan = USD. 399,221 Dolar. Tebal perkerasan lentur dengan umur rencana 20 tahun menunjuhkan bahwa pada jalan baru (pelebaran) 1 m (0.5 x 2 kiri kanan) yaitu : AC-WC = 40 mm, AC-BC = 60 mm, AC-Base = 80 mm, LFA = 300 mm LFB = 100 mm. pada perkerasaan eksisting perlu penambahan tebal lapis jalan (Overlay) dengan lebar jalan 5 m dengan lapis tambah AC-WC = 40 mm, AC-BC = 60 mm, AC-Base 80 mm. total kesuluruhan biaya konstruksi sebesar dolar 1.451.130 (Satu juta empat ratus lima puluh satu ribu seratus tiga puluh dolar) di konversi ke rupiah sebesar RP. 2.031.582.000 (Dua miliar tiga puluh satu juta lima ratus delapan puluh dua ribuh rupiah)
Kata kunci : Volume Kapasitas Jalan, Geometrik jalan, Perkerasaan Lentur, Rencana Anggaran Biaya
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
The lower-middle Messinian turbidite deposits of the Laga Basin (central Apennines, Italy)
No full textTurbidite sedimentation occurs in different tectonic contexts, although the major fossil record of these deposits is preserved in the foreland basin systems. In such type of basins turbidite deposits coexist at different depth being located either in the more deeper portions (foredeep turbidite systems) or in the relatively shallower tectonically confined depressions occurring on top of the thrust belt (wedge-top turbidite systems). The possibility to find both preserved and superimposed one to each other these turbidite systems is strictly related to progressive shiftiing of the main depocentres towards the foreland, a process that is essentially controlled by thrust propagation. This sedimentary evolution is well recorded by the Marnoso-areanacea and the Lower Messinian Laga Formation the
deposits of which show many features indicating a sedimentation in a confined basin in which thrust propagation controlled shape, dimension and topography of the basin as well as the geometry of the deposits and the resulting facies
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