Contemporaneous faulting and clastic intrusions in the Quirke Lake Group, Elliot Lake, Ontario

1970 ◽  
Vol 7 (2) ◽  
pp. 215-225 ◽  
Author(s):  
G. H. Eisbacher
Keyword(s):  
Lake Ontario ◽  
Normal Faults ◽  
Glacial Origin ◽  
Vertical Displacements ◽  
Sedimentary Succession

Contemporaneous faults and clastic intrusions near Elliot Lake are common within the Espanola Formation of the Quirke Lake Group. Contemporaneous faults formed in response to differential vertical displacements which controlled regional paleocurrents and basin slope. The normal faults within the sedimentary succession probably channeled the intrusive material of the clastic dikes. Four types of clastic dikes occur in the Espanola Formation: internally sorted conglomerate dikes; internally unsorted conglomerate dikes; thin sand- and siltstone dikes; and discordant sandstone masses with scattered quartz pebbles. Emplacement of the conglomerate masses into the Espanola Formation may represent a sub-permafrost phenomenon, provided the glacial origin for the boulder conglomerates within the Huronian succession is accepted.

Shallow faults, Upper Cretaceous clinoforms, and the Colonsay Collapse, Saskatchewan

2006 ◽  
Vol 43 (12) ◽  
pp. 1859-1875 ◽  
Author(s):  
Don Gendzwill ◽  
Mel Stauffer
Keyword(s):  
Upper Cretaceous ◽  
Late Glacial ◽  
Open Pit ◽  
Normal Faults ◽  
Reflection Seismic ◽  
Horizontal Length ◽  
Vertical Displacements ◽  
Two Stages ◽  
Seismic Reflections ◽  
Glacial Time

Reflection seismic data in the vicinity of the Colonsay potash mine near Saskatoon, Saskatchewan, reveal numerous shallow normal faults with vertical displacements of as much as 25 m. The faults cut the glacial deposits and Upper Cretaceous rocks to a maximum depth of about 400 m. Horizontal length ranges from a few hundred to a few thousand metres. Similar faults are also exposed in several widely separated open-pit coal mines of southern Saskatchewan and may be common elsewhere in the prairies. Such faulting is considered to be a result of Tertiary to Quaternary extensional tectonics and may have been aided in this region by the melting of gas hydrates. The study area includes the east flank of the Colonsay Collapse, a subsidence structure caused by dissolution and removal of salt in the 200 m thick Devonian Prairie Evaporite Formation. Salt was removed in two stages prior to or during early glacial time and in late-glacial time. Subsidence was gradual, with no observable faulting. A complex of clinoform structures about 120 m thick and prograding east-northeast occurs in the Upper Cretaceous Lea Park Formation in the study area and may correlate to the Alderson Member of southern Saskatchewan. Strong seismic reflections within the complex could be due to gas-filled porosity. Where undermined by salt removal in the Colonsay Collapse, the clinoform structures now form drape antiforms.

scholarly journals Holocene Sedimentary Record and Coastal Evolution in the Makran Subduction Zone (Iran)

Quaternary ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 21 ◽  
Author(s):  
Raphaël Normand ◽  
Guy Simpson ◽  
Frédéric Herman ◽  
Rabiul Haque Biswas ◽  
Abbas Bahroudi
Keyword(s):  
Late Pleistocene ◽  
Coastal Evolution ◽  
Makran Subduction Zone ◽  
Surface Uplift ◽  
Marine Terraces ◽  
Vertical Displacements ◽  
History Of ◽  
Sedimentary Succession ◽  
Large Earthquakes ◽  
Lateral Propagation

The western Makran coast displays evidence of surface uplift since at least the Late Pleistocene, but it remains uncertain whether this displacement is accommodated by creep on the subduction interface, or in a series of large earthquakes. Here, we address this problem by looking at the short-term (Holocene) history of continental vertical displacements recorded in the geomorphology and sedimentary succession of the Makran beaches. In the region of Chabahar (Southern Iran), we study two bay-beaches through the description, measurement and dating of 13 sedimentary sections with a combination of radiocarbon and Optically Stimulated Luminescence (OSL) dating. Our results show that lagoonal settings dominate the early Holocene of both studied beach sections. A flooding surface associated with the Holocene maximum transgression is followed by a prograding sequence of tidal and beach deposits. Coastal progradation is evidenced in Pozm Bay, where we observe a rapid buildup of the beach ridge succession (3.5 m/years lateral propagation over the last 1950 years). Dating of Beris Beach revealed high rates of uplift, comparable to the rates obtained from the nearby Late Pleistocene marine terraces. A 3150-year-old flooding surface within the sedimentary succession of Chabahar Bay was possibly caused by rapid subsidence during an earthquake. If true, this might indicate that the Western Makran does produce large earthquakes, similar to those that have occurred further east in the Pakistani Makran.

scholarly journals Recent Deformation in the Bottom Sediments of Western and Southeastern Lake Ontario and its Association with Major Structures and Seismicity

2007 ◽  
Vol 47 (3) ◽  
pp. 325-335 ◽  
Author(s):  
R. L. Thomas ◽  
J. L. Wallach ◽  
R. K. McMillan ◽  
J. R. Bowlby ◽  
S. Frape ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Lake Ontario ◽  
Rift System ◽  
Glacial Sediments ◽  
Western Lake ◽  
Geophysical Surveys ◽  
Lake Bottom ◽  
Vertical Displacements ◽  
Lake Bottom Sediments ◽  
Paleozoic Rocks

ABSTRACT Geophysical surveys, undertaken in the Toronto-Burlington corridor of western Lake Ontario and in the Rochester Basin of southeastern Lake Ontario, revealed the presence of features affecting the young lake-bottom sediments. In the western part of the lake, they include inferred pop-ups in bedrock, and plumose structures, dark linear patterns, and linear belts of circular to elliptical signatures in the modern mud. In southeastern Lake Ontario the glacial and post-glacial sediments display vertical separations of on the order of 10-15 m. Pop-ups are tectonically-induced structures. The features in the modern mud commonly parallel the orientation of P-stresses measured in Paleozoic rocks nearby and, along with the pop-ups, are spatially related to an aeromagnetic lineament. Furthermore, all of these features occur within a seismically active belt. The vertical displacements of the layered glacial and post-glacial sediments, within the Rochester Basin, are located along the southern margin of the postulated WSW extension of the seismically active St. Lawrence rift system and are interpreted to be due to faulting. The geologically young age of the sediments affected by the various deformational features, along with the characteristics of the features themselves, suggest that the lake-bottom sediments surveyed in this study may have recorded the effects of neotectonic processes.

Estimating the slip rates of normal faults in the Great Basin, USA

2000 ◽  
Vol 12 (3-4) ◽  
pp. 227-240 ◽  
Author(s):  
C. M. dePolo ◽  
J. G. Anderson
Keyword(s):  
Great Basin ◽  
Normal Faults ◽  
Slip Rates

The Comparison of Land Subsidence between East and West Side of Bangkok, Thailand

2020 ◽  
Vol 17 (3) ◽  
pp. 1
Author(s):  
Angkana Pumpuang ◽  
Anuphao Aobpaet
Keyword(s):  
Time Series ◽  
Land Subsidence ◽  
Time Series Data ◽  
Series Data ◽  
Industrial Estates ◽  
Vertical Displacements ◽  
Land Deformation ◽  
Extensive Farming ◽  
Chao Phraya River ◽  
Set Up

The land deformation in line of sight (LOS) direction can be measured using time series InSAR. InSAR can successfully measure land subsidence based on LOS in many big cities, including the eastern and western regions of Bangkok which is separated by Chao Phraya River. There are differences in prosperity between both sides due to human activities, land use, and land cover. This study focuses on the land subsidence difference between the western and eastern regions of Bangkok and the most possible cause affecting the land subsidence rates. The Radarsat-2 single look complex (SLC) was used to set up the time series data for long term monitoring. To generate interferograms, StaMPS for Time Series InSAR processing was applied by using the PSI algorithm in DORIS software. It was found that the subsidence was more to the eastern regions of Bangkok where the vertical displacements were +0.461 millimetres and -0.919 millimetres on the western and the eastern side respectively. The districts of Nong Chok, Lat Krabang, and Khlong Samwa have the most extensive farming area in eastern Bangkok. Besides, there were also three major industrial estates located in eastern Bangkok like Lat Krabang, Anya Thani and Bang Chan Industrial Estate. By the assumption of water demand, there were forty-eight wells and three wells found in the eastern and western part respectively. The number of groundwater wells shows that eastern Bangkok has the demand for water over the west, and the pumping of groundwater is a significant factor that causes land subsidence in the area.Keywords: Subsidence, InSAR, Radarsat-2, Bangkok

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