The basic dyke swarms in the Wudang block and its geological significance

1998 ◽  
Vol 43 (13) ◽  
pp. 1111-1115 ◽  
Author(s):  
Dingwu Zhou ◽  
Chengli Zhang ◽  
Juli Wang ◽  
Liang Liu ◽  
Yunpeng Dong ◽  
...  
Keyword(s):  
Basic Dyke ◽  
Geological Significance ◽  
Wudang Block ◽  
Dyke Swarms

Study on the Sr, Nd, Pb and O isotopes of basic dyke swarms in the Wudang block and basic volcanics of the Yaolinghe Group

2001 ◽  
Vol 20 (3) ◽  
pp. 193-200 ◽  
Author(s):  
Chengli Zhang ◽  
Dingwu Zhou ◽  
Hailong Jin ◽  
Song Han ◽  
Yinyu Liu
Keyword(s):  
Basic Dyke ◽  
O Isotopes ◽  
Basic Volcanics ◽  
Wudang Block ◽  
Dyke Swarms

scholarly journals Geological reconnaissance of the Precambrian rocks of south-east Greenland

1969 ◽  
Vol 19 ◽  
pp. 43-50
Author(s):  
D Bridgwater ◽  
K Gormsen
Keyword(s):  
Structural Units ◽  
Basic Dyke ◽  
East Greenland ◽  
Precambrian Rocks ◽  
Central Block ◽  
Dyke Swarms

The Precambrian of SE Greenland can be divided into three main structural units; a northern block affected by the eastern continuation of the Nagssugtoqidian orogeny; a southern block affected by the Ketilidian orogeny; and a central block of gneisses unaffected by these younger events. The boundaries of the younger orogenies can be seen in the field by their effect on basic dyke swarms intruded into the older basement. With the exception of younger intrusive complexes, the rocks so far mapped within the two younger orogenic complexes in this part of Greenland are all derived from an older basement.

scholarly journals Ti-rich plagioclase-phyric dykes of southern West Greenland

1987 ◽  
Vol 135 ◽  
pp. 46-52
Author(s):  
R.P Hall ◽  
D.J Hughes ◽  
C.R.L Friend
Keyword(s):  
World Wide ◽  
Entire Region ◽  
Basic Dyke ◽  
Systematic Mapping ◽  
Late Archaean ◽  
West Greenland ◽  
Mantle Evolution ◽  
The World ◽  
Geological Map ◽  
Dyke Swarms

The investigation of Proterozoic basic dykes in southern West Greenland stemmed from the programme of systematic mapping of the Archaean craton in that region by the Geological Survey of Greenland (GGU). This work began in the southern Frederikshåb region in the early 1960s (Jensen, 1968, 1969) and progressed northwards, from bases in the Fiskenæsset (Kalsbeek & Myers, 1973; GGU, 1976), Godthåb (Allaart et al., 1977) and Sukkertoppen areas (Allaart et al., 1978). The results of most of this mapping work were summarized by Bridgwater et al. (1976) and compiled onto a 1:500 000 scale geological map sheet by Allaart (1982). The distribution of the major Proterozoic dykes which cut the entire region is shown on this map. While the basic dykes are individually minor intrusions, many are up to 50 metres wide and continuous for several tens of kilometres, and collectively they represent a major magmatic event. As many of the Archaean terrains of the world possess Proterozoic basic dyke swarms, their compositions are crucial to a correlation of events from one craton to another and to an understanding of crustal and mantle evolution after the world-wide late Archaean sialic crust-forming event.

scholarly journals A metamorphosed basic dyke swarm in the vicinity of Sarqarigsup nunâ (Ravns Storø area), Fiskenæsset, southern West Greenland

1976 ◽  
Vol 73 ◽  
pp. 22-30
Author(s):  
C.R.L Friend
Keyword(s):  
Significant Part ◽  
Dyke Swarm ◽  
Basic Dyke ◽  
West Greenland ◽  
Plutonic Rocks ◽  
Dyke Swarms

Ancient dyke swarms have been used successfully as time markers throughout the Archaean of West Greenland, particularly in subdividing the early Archaean in the Godthåb region (McGregor, 1973). This paper describes a swarm of metamorphosed basic dykes which cut across the lithologicallayering and an early tectonic fabric in the Ravns Storø group of metavo1canic and plutonic rocks. Previously only sporadic occurrences of metamorphosed basic dykes have been noted in the Fiskenæsset region. The Sarqarigsup nuna swarm may thus have a significant part to play in the division of the events which have taken place in the area from the Frederikshåbs Isblink to Bjørnesund and perhaps even further north.

The paleomagnetism and geological significance of Mesoproterozoic dyke swarms in the central North China Craton

2001 ◽  
Vol 44 (2) ◽  
pp. 185-192 ◽  
Author(s):  
Hou Guiting ◽  
Li Jianghai ◽  
Qian Xianglin ◽  
Zhang Baoxing ◽  
H. C. Halls
Keyword(s):  
North China Craton ◽  
North China ◽  
Geological Significance ◽  
Dyke Swarms

The tectonic significance of some basic dyke swarms in the Canadian Superior Province with special reference to the geochemistry and paleomagnetism of the Mistassini swarm, Quebec, Canada

1986 ◽  
Vol 23 (2) ◽  
pp. 238-253 ◽  
Author(s):  
W. F. Fahrig ◽  
K. W. Christie ◽  
E. H. Chown ◽  
D. Janes ◽  
N. Machado
Keyword(s):  
Genetic Relationship ◽  
Early Stage ◽  
Tectonic Setting ◽  
Superior Province ◽  
Plate Boundaries ◽  
Basic Dyke ◽  
Tectonic Significance ◽  
Fold Belts ◽  
Opening And Closing ◽  
Dyke Swarms

The Mistassini dykes extend northwest from the Mistassini embayment and comprise both tholeiitic and komatiitic suites. They are probably > 2000 Ma old and yield two major paleomagnetic components. One of these, with a pole at 131°W, 13°S, is thought to be an overprint related to the Elsonian Disturbance 1400–1500 Ma ago. A very steeply down (and reversed) component may be primary and has a pole at 080°W, 50°N.These spacial, chemical, and age relationships between the Mistassini, Molson, Marathon, and Payne River dyke swarms and the Aphebian supracrustal fold belts on the perimeter of the Superior Province suggest a genetic relationship between the dyke swarms and the fold belts. The supracrustal belts are evidence of the opening and closing of oceans, and the dyke swarms are evidence of early-stage failed arms related to these openings. More rarely (for example, the Payne River dykes), early-stage dyke swarms are developed and preserved parallel to the edges of newly developed spreading plate boundaries. Presumably if a spreading episode stops, the dykes themselves may remain as the only evidence of that event. Probably all the world's great continental dyke swarms have the above-described tectonic setting, and the number and extent of dyke swarms during a geological epoch may be a measure of the number and vigour of spreading events.

Geochemistry of early Paleozoic alkali dyke swarms in south Qinling and its geological significance

2003 ◽  
Vol 46 (12) ◽  
pp. 1292-1306 ◽  
Author(s):  
Chengli Zhang ◽  
Shan Gao ◽  
Guowei Zhang ◽  
Xiaoming Liu ◽  
Zaiping Yu
Keyword(s):  
Early Paleozoic ◽  
Geological Significance ◽  
South Qinling ◽  
Dyke Swarms

scholarly journals Field relations of some Precambrian basic dykes in the vicinity of Sukkertoppen, central West Greenland

1978 ◽  
Vol 90 ◽  
pp. 54-57
Author(s):  
C.R.L Friend
Keyword(s):  
Central Portion ◽  
Garnet Amphibolite ◽  
Basic Dyke ◽  
West Greenland ◽  
Dyke Swarms

Various field relations of the basic dyke swarms near Sukkertoppen have been described (Ramberg, 1948; Berthelsen & Bridgwater, 1960; Windley, 1970) and a preliminary chronology suggested (Bridgwater et al., 1976). The Kangâmiut dykes are noteable in that the central portion of some of the dykes has been converted into amphibolite and garnet amphibolite (Ramberg, 1948; Windley, 1970). Otherwise they appear as normal dolerites.

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