scholarly journals Geology and recognition criteria for sandstone uranium deposits in mixed fluvial-shallow marine sedimentary sequences, South Texas. Final report

1981 ◽  
Author(s):  
S Adams ◽  
R Smith
Keyword(s):  
South Texas ◽  
Final Report ◽  
Uranium Deposits ◽  
Shallow Marine ◽  
Sedimentary Sequences

scholarly journals Geology and recognition criteria for roll-type uranium deposits in continental sandstones. Final report

1981 ◽  
Author(s):  
E.N. Harshman ◽  
S.S. Adams
Keyword(s):  
Final Report ◽  
Uranium Deposits ◽  
Roll Type

scholarly journals Cloudiness transitions within shallow marine clouds near the Azores. Final report

2018 ◽  
Author(s):  
Simon P. de Szoeke
Keyword(s):  
Final Report ◽  
Shallow Marine

The Wenlock sediments of north-west Galway, Ireland.

1970 ◽  
Vol 107 (4) ◽  
pp. 297-317 ◽  
Author(s):  
M. G. Laird ◽  
W. S. McKerrow
Keyword(s):  
Sediment Supply ◽  
Shallow Marine ◽  
North West ◽  
Sedimentary Sequences ◽  
The North ◽  
Upper Silurian

SummaryThis work describes the Wenlock sedimentary sequences south of Killary Harbour where the fullest successions in north-west Galway are exposed; much of the Upper Silurian in the east (Joyces Country) has been removed by erosion.The Wenlock beds (the Upper Owenduff and Killary Harbour Groups) rest on shallow marine and continental sediments (the Lower Owenduff Group) of Upper Llandovery (C5–6) age. Conglomerates near the base of the Wenlock are followed by 1,500 m of sandstones, which are mostly turbidites and which contain Middle Wenlock graptolites. These basin deposits are succeeded by a transitional sequence of rise, slope and shelf clastics, also of Middle Wenlock age. The youngest Silurian beds exposed are 800 m of red lagoonal deposits withLingula.During Wenlock times, the sediment supply to north-west Galway was mainly from the north and north-west. This observation fits well with the regional picture which places Galway near the north-west margin of a Silurian basin which extended eastwards across Ireland.

Late Cretaceous – Tertiary sediments offshore central West Greenland: lithostratigraphy, sedimentary evolution, and petroleum potential

1985 ◽  
Vol 22 (7) ◽  
pp. 1001-1019 ◽  
Author(s):  
Flemming Rolle
Keyword(s):  
Upper Cretaceous ◽  
Source Rocks ◽  
Petroleum Potential ◽  
Shallow Marine ◽  
West Greenland ◽  
Reservoir Rocks ◽  
Sedimentary Sequences ◽  
Sedimentary Evolution ◽  
Petroleum Generation ◽  
Exploratory Wells

Five dry exploratory wells were drilled through Upper Cretaceous and Tertiary sediments on the West Greenland shelf in 1976 and 1977. Two of these entered Precambrian basement, two bottomed in Paleocene or Upper Cretaceous basalt, and one in Campanian mudstone. On the basis of samples and logs supplied to the Geological Survey of Greenland the sedimentary sequence has been divided into seven new formations: the Campanian Narssarmiut Formation, consisting of coarse basement wash and black mudstone; the Campanian to Eocene Ikermiut Formation, consisting of marine organic-rich mudstone; the Upper Paleocene to Eocene Hellefisk Formation, comprising shallow-marine to paralic sandstone and mudstone; the Eocene Nukik Formation, consisting of turbiditic sandstone and mudstone; the Eocene to Oligocene Kangâmiut Formation of shelf to shallow-marine clean and argillaceous sandstone; the Oligocene to Neogene Manîtsoq Formation, consisting of coarse paralic to fan delta sandstone; and the Neogene Ataneq Formation, consisting of protected shallow-marine mudstone.The sedimentary evolution of the area fits well with earlier proposed models for the tectonic evolution of the Baffin Bay–Labrador Sea region.Potential petroleum source rocks are present in the Upper Cretaceous to Paleocene mudstone, and, even though they are largely immature in the drilled sections, they are expected to have entered the petroleum generation zone in the deeper parts of the basin. Their potential is mainly for gas, but some oil potential is also present. No reservoir rocks were encountered in the deeper parts of the sedimentary sequences, and the porous sandstones that occur higher in the sequence lack seals.

scholarly journals Sedimentological And Stratigraphical Analysis Of Kaki Bukit Formation (Lower Setul Member) At Teluk Ewa, Pulau Langkawi

2021 ◽  
Vol 72 ◽  
pp. 25-35
Author(s):  
Mohamad Ezanie Abu Samah ◽  
◽  
Che Aziz Ali ◽  
Kamal Roslan Mohamed ◽  
◽  
...  
Keyword(s):  
North American ◽  
Carbonate Sediment ◽  
Shallow Marine ◽  
Nomenclature Committee ◽  
Sedimentary Sequences ◽  
Marine System ◽  
Carbonate Sequence ◽  
Stratigraphic Nomenclature ◽  
Stratigraphic Succession

The identification of new units on the carbonate sequence of Teluk Ewa (from Tg. Mendidih to Teluk Ewa) has given an idea for the review of stratigraphic succession of Kaki Bukit Formation (Lower Setul Member). The analysis is related to a sedimentology study, where the sedimentary sequences formed as a mixed siliciclastic–carbonate shallow marine system that combines the carbonate and silisiclastic deposits. Eight facies have been recognised such as (1) argillite facies, (2) interlayer of mudstone and limestone facies, (3) wavy stromatolites limestone facies, (4) linear stromatolites limestone facies, (5) heterolithic of mudstone-limestone facies, (6) shale facies, (7) massive limestone facies and (8) thrombolites limestone facies. Each facies are divided into four litostratigraphic units based on the evaluation from Malaysian Stratigraphic Nomenclature Committee (1997) and North American Stratigraphic Code 2005. (1) The clastic unit referring to the uppertmost part of Machinchang Formation maintains it's name. Meanwhile, the suggested nomenclature for the new units such as (2) The Sabung Member is referring to the basal carbonate unit comprising microbial facies and mixed silisiclastic-carbonate sediment. (3) The Pesak Seluar Member in the middle is a silisiclastic unit that consists of shale facies and (4) The Ewa Member at the top representing the upper limestone unit. All units show a similar litostratigraphic characteristics that are found in Tarutao Group, Pante Malaka Formation, Rung Nok Formation and Lae Tong Formation in Thailand as described by Wongwanich et al. (1990; 2002) and Imsamut & Abdul Rahman (2017).

scholarly journals ESPINHAÇO - QUO VADIS ? (ONDE ESTÁ? - AONDE VAI?) A EVOLUÇÃO DOS CONHECIMENTOS SOBRE A CORDILHEIRA DO ESPINHAÇO MERIDIONAL EM MINAS GERAIS ENTRE 1979 E 1995

1995 ◽  
Author(s):  
Friedrich E. Renger ◽  
Luiz Guilherme Knauer
Keyword(s):  
Mineral Resource ◽  
Economic Geology ◽  
Minas Gerais ◽  
Complete Understanding ◽  
Geochronological Data ◽  
Shallow Marine ◽  
Sedimentary Sequences ◽  
Basic Volcanics ◽  
Quo Vadis ◽  
Archean Basement

In this paper a brief review is given of master and doctoral thesis as well of articles published duringthe last 16 years, concerning the geology of the Serra do Espinhaço in Minas Gerais, Brazil. The differentproposals of a subdivision of the Archean basement and sedimentary sequences of Pre-Espinhaço age arereviewed. The existing geochronological data are insufficient for a complete understanding of these units.The Espinhaço rift started its evolution about 1800 Ma ago with continental sediments with intercalationof acidic and basic volcanics evolving in the upper part of the sequence to shallow marine sedimentation.Aspects of stratigraphy and sedimentology of the Espinhaço Supergroup as well as those of structuraland economic geology are briefly discussed. Diamonds washed in the Sopa-Brumadinho conglomeratesand in alluvials remains the principal mineral resource as about 160 years ago predicted by L.W. vonEschwege. In recent years exploration work was successful to identify the gold deposit at Riacho dosMachados in the northern extension of the Serra do Espinhaço.A chapter resumes the geodymamic models presented during the considered period. Finally, suggestionsfor future investigations are listed.

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