Interplay between sulphur sources in polysulphidemineralisation in the Lower Palaeozoic of the Anglo-Brabant Fold belt, Belgium

2003 ◽  
Vol 78-79 ◽  
pp. 607-611
Author(s):  
S. Dewaele ◽  
Ph. Muchez ◽  
A. Boyce
Keyword(s):  
Fold Belt ◽  
Lower Palaeozoic

scholarly journals Structural and stratigraphic framework of the North Greenland fold belt in Johannes V. Jensen Land, Peary Land

1979 ◽  
Vol 93 ◽  
pp. 1-40
Author(s):  
P.R Dawes ◽  
N.J Soper
Keyword(s):  
Northern Coast ◽  
Structural Detail ◽  
Fold Belt ◽  
The North ◽  
Stratigraphic Framework ◽  
Mineral Assemblages ◽  
Lower Palaeozoic ◽  
Main Deformation ◽  
Basin Margin ◽  
North Greenland

Structural and stratigraphic detaiIs collected during reconnaissance fjeld work in northern Peary Land in 1969 are presented to substantiate the rather general accounts of the North Greenland fold belt hitherto published. The structural detail, largely in the form of graphic profiles sketched in the fieid, is referred to a structural frarnework in which three main deformation phases are recognised. The fold belt displays a roughly E-W zonation based on the progressive northerly increasing intensity of deformation and metamorphic effects that culminate along the northern coast in amphibolite-facies mineral assemblages in complexly folded schist lithologies. It is stressed that, while the conspicuous structural character of the fold belt is its northerly vergence seen particularly in the northernmost part, the detailed structural make-up of the fold belt is complex. Fold style and vergence vary considerably and the southern margin of the fold belt, autochthonous with respect to the platform, is characterised by south-verging folds. Some stratigraphical data is presented particularly from the Lower Palaeozoic sequence at the southern part of the fold belt that iIIustrates the basinal clastic facies at the sheIf-basin margin.

scholarly journals The North Greenland fold belt in eastern Johannes V Jensen Land

1980 ◽  
Vol 99 ◽  
pp. 89-98
Author(s):  
N.J Soper ◽  
A.K Higgins ◽  
J.D Friderichsen
Keyword(s):  
Metamorphic Grade ◽  
Fold Belt ◽  
The North ◽  
Lower Palaeozoic ◽  
North Greenland ◽  
Dividing Line

This report concerns that part of the North Greenland fold belt in north Peary Land (Johannes V. Jensen Land) which lies east of Polkorridoren (the glacier filled depression between Frigg Fjord and Sands Fjord) and north of the Harder Fjord fault (fig. 40). The rocks forming the fold belt are mainly Lower Palaeozoic quartzites, carbonates, arkoses and shales, which are an extension of the Hazen Trough that stretched through the Queen Elizabeth Islands of Canada and across northern Greenland. Because of the northward increase in deformation and metamorphic grade, it is convenient to subdivide the region into a southerly, less deformed, area in which a stratigraphical sequence ean be established, and a northerly area in which only lithological units can be mapped. The dividing line corresponds to that, north of which, 'way-up' criteria cannot be used owing to the masking of the sedimentation structures by a pervasive schistosity. This line runs approximately from the northern end of Paradisfjeld to Bliss Bugt.

scholarly journals Geology of central and eastern North Greenland

1986 ◽  
Vol 128 ◽  
pp. 37-54
Author(s):  
A.K Higgins
Keyword(s):  
Historical Review ◽  
Convincing Evidence ◽  
Fold Belt ◽  
Sedimentary Sequences ◽  
The North ◽  
Middle Carboniferous ◽  
Lower Palaeozoic ◽  
Dyke Swarms ◽  
Grade Increase ◽  
North Greenland

A historical review of geological research in North Greenland is followed by a summary of the main results of the 1978-80 GGU expeditions to the region. New outcrops of Archaean and early Proterozoic crystalline rocks are recorded only as xenoliths in dykes and volcanic centres. A revised stratigraphy is applied to the middle Proterozoic Independence Fjord Group sandstones, while petrographic and isotopic studies have been made of the cross-cutting Midsommersø dolerites and the overlying Zig-Zag Dal Basalt Formation. No convincing evidence has been found of a Carolinidian orogenic episode separating these units from succeeding late Proterozoic sedimentary sequences. Lower Palaeozoic sediments dominate North Greenland and are divided into southern shelf and northern trough successions; new or revised stratigraphies are now applied in both settings. The shelf-trough boundary can be shown to have moved south with time, and a major early Silurian expansion of the trough is related to shelf subsidence and a new phase of turbidite deposition derived from the rising East Greenland Caledonian mountains. Devonian - Middle Carboniferous (Ellesmerian) deformation brought deposition to a close and created the North Greenland fold belt, in which deformation intensity and metamorphic grade increase northwards. Thin-skinned thrusting in association with west or south-facing folds is important in southern areas; this is one of the main differences in interpretation compared to earlier work in the fold belt. New outcrops of post-ElIesmerian sediments (Wandel Sea Basin) have mainly been recorded as fault or thrust bounded sequences; a new stratigraphy is applied to the Wandel Sea Basin succession. Cretaceous - Tertiary events include a suite of volcanic centres, dyke swarms, the Kap Washington Group volcanics, and faults and thrusts of Tertiary (Eurekan) age; all have been studied anew, as have the Quaternary deposits.

scholarly journals Lower Palaeozoic geology of the western part of the North Greenland fold belt

1966 ◽  
Vol 11 ◽  
pp. 11-15
Author(s):  
P.R Dawes
Keyword(s):  
The Arctic ◽  
North Coast ◽  
Northern Coast ◽  
Fold Belt ◽  
North West ◽  
The North ◽  
Lower Palaeozoic ◽  
Inland Ice ◽  
Insight Into ◽  
North Greenland

In the summers 1965 and 1966 reconnaissance mapping of 10 000 km2 of the rarely visited north coast of North Greenland was carried out. In 1965 the investigations were restricted to Hall Land (fig. 3) with a view of obtaining an insight into the stratigraphy of the Ordovician-Silurian succession, while in 1966 work centred on Nyeboe Land and Hendrik Island with cursory exammation of the north-west coast of Wulff Land and the islands in Sherard Osborn Fjord. Both the unfolded rocks of the south towards the Inland Ice and the folded rocks of the northern coast bordering the Robeson Channel and the Arctic Ocean were studied and in the two summers a broad view of the western part of the North Greenland fold belt i. e. west of Peary Land, has been obained.

Cleavage–fold relationships in the Lower Cambrian Tubize Group, southeast Anglo-Brabant Fold Belt (Lembeek, Belgium)

1998 ◽  
Vol 135 (2) ◽  
pp. 217-226 ◽  
Author(s):  
M. SINTUBIN ◽  
F. BRODKOM ◽  
D. LADURON
Keyword(s):  
Lower Cambrian ◽  
Large Scale ◽  
Local Strain ◽  
Structural Features ◽  
Railway Track ◽  
Fold Belt ◽  
Regional Deformation ◽  
Regional Trends ◽  
Lower Palaeozoic ◽  
Southern Extremity

Little is known about the cleavage–fold relationships in the Lower Palaeozoic Brabant Massif, primarily because of the scarcity of suitable exposures. Moreover, to date, folds have only been described in the Ordovician and Silurian sequences along the southern extremity of the basement. However, excavation works for the construction of the TGV(railway)-track south of Brussels created an opportunity to study cleavage–fold relationships in the Lower Cambrian terrigenous series (Tubize Group) in a more central part of the Brabant Massif. The structural features observed seemed inconsistent with the suspected regional trends. Primarily, a divergent cleavage fan was observed in a region thought to have a regular cleavage attitude. The symmetrical but divergent disposition of the cleavage with regard to the fold hinges is explained by flexural folding of a pre-existing bedding-parallel compaction fabric. Cleavage development and folding are considered synchronous. The divergent cleavage fan reflects local strain variations. Also the steeply plunging hinge lines of the open, subangular folds are seemingly inconsistent with the regional trend characterized by subhorizontal fold hinges. Taking into account the structural position of the fold assemblage in the subvertical limb of a large-scale, upright, isoclinal fold structure, the fold assemblage is interpreted as an incongruous parasitic feature. The steeply plunging hinge lines are considered to be caused by fold hinge rotation during progressive coaxial deformation. Although this incongruous fold assemblage with its divergent cleavage fan is localized, it provides important information on both local and regional deformation circumstances in this part of the Anglo-Brabant Fold Belt.

scholarly journals The North Greenland fold belt between central Johannes V Jensen Land and eastern Nansen Land

1981 ◽  
Vol 106 ◽  
pp. 35-45
Author(s):  
A.K Higgins ◽  
J.D Friderichsen ◽  
N.J Soper
Keyword(s):  
Fault Zone ◽  
Ellesmere Island ◽  
Fold Belt ◽  
The West ◽  
Eastern Margin ◽  
The North ◽  
Thrust Zone ◽  
Geological Map ◽  
Lower Palaeozoic ◽  
North Greenland

The part of the North Greenland fold belt mapped in 1980 includes Johannes V. Jensen Land west of Polkorridoren, the group of large islands to the west, and the eastern margin of Nansen Land (Map 2). The rocks forming the fold belt are mainly Lower Palaeozoic turbiditic sediments, deposited in an E-W trending trough which is an extension of the Hazen trough of northern Ellesmere Island, Canada. Observations on the stratigraphy, structure and metamorphism of the fold belt are given in this report. Brief descriptions of the E-W trending Harder Fjord fault zone, the Kap Cannon thrust zone, and important swarms of basic dykes are also included. A geological map covering the parts of the North Greenland fold belt mapped in both 1979 and 1980 is found in the back of this report (Map 2), and indudes all the place names mentioned in the text.

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