Fluoride and chloride melts included in phenocrysts of agpaitic acid volcanic rocks from Pantelleria Island

2010 ◽  
Vol 433 (1) ◽  
pp. 978-981 ◽  
Author(s):  
I. P. Solovova ◽  
A. V. Girnis ◽  
V. I. Kovalenko
Keyword(s):  
Volcanic Rocks ◽  
Chloride Melts ◽  
Acid Volcanic

scholarly journals III.—On the Probable Pelean Origin of the Felsitic Slates of Snowdon, and their Metamorphism

1905 ◽  
Vol 2 (12) ◽  
pp. 541-549 ◽  
Author(s):  
J. R. Dakyns ◽  
Edward Greenly ◽  
J. R. Dakyns
Keyword(s):  
Viscous Flow ◽  
Volcanic Rocks ◽  
Acid Volcanic

There are several kinds of acid volcanic rocks in Wales. In the X neighbourhood of Snowdon there are at least five kinds, as follows:1. There are undoubted lavas, showing lines of viscous flow and sometimes vesicular, and weathering into cubical blocks. Such may be seen on Crib Goch and on Crib Yddysgl, on Cerrig Cochion, and elsewhere. These rocks are rarely cleaved.2. There are rocks like the last as to fracture and mode of weathering, but which are neither viscous nor vesicular. They are probably masses of felsitic dust or mud. Such may be seen in Cwm Llan.3. There are also massive felstones, rudely cleaved, such as form Moel Meirch. and Clogwyn Llwyd.4. There are the so-called ashes of various kinds, usually wellbedded and often highly cleaved.5. Lastly, there are highly cleaved felsitic rocks, which show no lines of viscous flow, are generally unbedded, and which are in many places fragmentary.

Possible signs of liquation in acid volcanic rocks

1980 ◽  
Vol 22 (12) ◽  
pp. 1437-1442
Author(s):  
N. V. Koronovskiy ◽  
E. D. Fromberg
Keyword(s):  
Volcanic Rocks ◽  
Acid Volcanic

scholarly journals A well-preserved bimodal Archaean volcanic succession in the Tasiusarsuaq terrane, South-West Greenland

2007 ◽  
Vol 13 ◽  
pp. 53-56 ◽  
Author(s):  
Henrik Stendal ◽  
Anders Scherstén
Keyword(s):  
Volcanic Rocks ◽  
Field Investigation ◽  
Geological Mapping ◽  
Ocean Floor ◽  
Field Campaign ◽  
Mafic Rocks ◽  
West Greenland ◽  
South West ◽  
Acid Volcanic ◽  
Volcanic Succession

During the field campaign in the Nuuk region, one of the objectives was to describe Archaean primary geological environments (Hollis et al. 2006). On Nunatak 1390, which is part of the Tasiusarsuaq terrane (Figs 1, 2), a bi modal volcanic succession is preserved and interpreted as former ocean floor. The field investigation included geological mapping and sampling of the volcanic sequence comprising mafic to ul tra mafic rocks, and associated acid volcanic rocks and granite intrusions.

scholarly journals New geological investigations in eastern Disko: redeposited volcanoclastic sediments with rhyolite from the Nordfjord Member

1989 ◽  
Vol 145 ◽  
pp. 45-49
Author(s):  
L.M Larsen ◽  
A.K Pedersen
Keyword(s):  
Volcanic Rocks ◽  
Field Work ◽  
Shallow Sea ◽  
Acid Volcanic ◽  
North Western

During field work in 1988 in eastern Disko we encountered redeposited volcanoclastic sediments with acid rocks at several localities between Rensdyrdalen and Charles Polaris Dal within lava sequences from the Nordfjord Member of the Maligât Formation. Some of the sediments were only observed during helicopter reconnaissance of steep inaccessible walls and corries, while other sites provided detailed information and samples through field visits. Fig.1 shows the area with newly discovered acid volcanic rocks in eastern Disko. Localities 1 and 2 denote localities investigated in some detail. In north-western Disko peraluminous rhyolite tuffs and conglomerates with almandine-bearing rhyolite blocks occur as widespread but minor deposits in the Nordfjord Member (Pedersen, 1977; Hansen & Pedersen, 1985; Pedersen & Pedersen, 1987). The acid rocks contain graphite and scarce sediment xenoliths and they are associated with contaminated basalts, andesites and dacites, same af which carry nativc iran. The distribution af airfall rhyolite tuff shows that the aciel rocks were erupted somewhere in north-western Disko or in the present shallow sea west af this arca. No eruption sites are exposed at present.

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