Prehnite-pumpellyite facies metamorphism in Precambrian basement rocks of S Sweden

1971 ◽  
Vol 32 (4) ◽  
pp. 307-314 ◽  
Author(s):  
H. P. Zeck
Keyword(s):  
Precambrian Basement ◽  
Basement Rocks ◽  
Facies Metamorphism

Structure de la region d'Ijibiten (feuille El Gleitat, E d'Akjoujt, Mauritanie occidentale)

1969 ◽  
Vol S7-XI (2) ◽  
pp. 222-232 ◽  
Author(s):  
Jean Paul Lecorche
Keyword(s):  
Sedimentary Cover ◽  
Precambrian Basement ◽  
Basement Rocks

Abstract Folds, overthrusts, four units, Precambrian basement rocks, sedimentary cover of Paleozoic age, Reg unit overthrust, and the epimetamorphic formations

scholarly journals From source to sink in central Gondwana: Exhumation of the Precambrian basement rocks of Tanzania and sediment accumulation in the adjacent Congo basin

Tectonics ◽  
2016 ◽  
Vol 35 (9) ◽  
pp. 2034-2051 ◽  
Author(s):  
Charles Happe Kasanzu ◽  
Bastien Linol ◽  
Maarten J. de Wit ◽  
Roderick Brown ◽  
Cristina Persano ◽  
...  
Keyword(s):  
Sediment Accumulation ◽  
Congo Basin ◽  
Precambrian Basement ◽  
Basement Rocks ◽  
Source To Sink

Geology and Ages of Buried Precambrian Basement Rocks, Manitoulin Island, Ontario

1975 ◽  
Vol 12 (7) ◽  
pp. 1175-1189 ◽  
Author(s):  
W. R. Van Schmus ◽  
K. D. Card ◽  
K. L. Harrower
Keyword(s):  
Granitic Rocks ◽  
Precambrian Basement ◽  
Aeromagnetic Data ◽  
Grenville Province ◽  
Metasedimentary Rocks ◽  
Basement Rocks ◽  
Metavolcanic Rocks ◽  
Northern Half ◽  
East End ◽  
Archean Basement

The geology of the buried Precambrian basement under Manitoulin Island in northern Lake Huron, Ontario, has been re-evaluated on the basis of aeromagnetic data, well cuttings, core samples, and rubidium–strontium and uranium–lead geochronologic data on some of the subsurface samples. We conclude that the northern half of the island is underlain in part by Huronian metasedimentary rocks, but that these are absent from the southern part of the island, which is underlain by granitic, gneissic, and metavolcanic rocks. Granitic and gneissic rocks are also present under the northern half of the island.Geochronologic data show that rocks underlying major positive aeromagnetic anomalies are quartz-monzonitic composite plutons which are about 1500 ± 20 m.y. old. Surrounding metasedimentary. gneissic, and granitic rocks are at least 1700 m.y. old. No evidence was found for extrapolation of the pre-Huroman Archean basement beneath Manitoulin Island; if it is present it has been affected by younger metamorphic overprinting.The south west ward extension of the boundary zone between the Grenville Province and rocks to the west can he traced along the east end of Manitoulin Island on the basis of aeromagnetic data.

P–T conditions of Grenville-age eclogite facies metamorphism and amphibolite facies retrogression of the Glenelg–Attadale Inlier, NW Scotland

2005 ◽  
Vol 142 (5) ◽  
pp. 605-615 ◽  
Author(s):  
C. D. STOREY ◽  
T. S. BREWER ◽  
S. TEMPERLEY
Keyword(s):  
Tectonic Evolution ◽  
Amphibolite Facies ◽  
Geodynamic Evolution ◽  
Broad Agreement ◽  
Grenville Orogeny ◽  
Basement Rocks ◽  
Facies Metamorphism ◽  
Uplift Rates ◽  
Peak Metamorphism ◽  
Eclogite Facies

Peak and retrograde P–T conditions of Grenville-age eclogites from the Glenelg–Attadale Inlier of the northwest Highlands of Scotland are presented. Peak conditions are estimated as c. 20 kbar and 750–780°C, in broad agreement with previous work. The eclogites subsequently followed a steep decompression path to c. 13 kbar and 650–700°C during amphibolite facies retrogression. Peak eclogite facies metamorphism occurred > 1080 Ma and retrogression at c. 995 Ma, suggesting fairly sluggish uplift rates of < 0.3 km/Ma and cooling rates of < 1.25°C/Ma, when compared with other parts of the Grenville orogeny and/or modern orogens. However, current poor constraints on the timing of peak metamorphism mean that these rates cannot be used to interpret the geodynamic evolution of this part of the orogen. The P–T–t data, together with petrology and the field relationships between the basement rocks of the Glenelg–Attadale Inlier and the overlying Moine Supergroup, mean that it is difficult to support the currently held view that an unconformable relationship exists between the two. It is suggested that more data are required in order to re-interpret the Neoproterozic tectonic evolution of the northwest Highlands of Scotland.

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