Fine-grained igneous rock, resulting from alteration of oceanic basalt
Spilite
Spilite (from Greek: σπιλάς) is a fine-grained igneous rock, resulting particularly from alteration of oceanic basalt.
The term was introduced into the geological literature by Alexandre Brongniart in 1827.[1] Spilite is formed when basaltic lava reacts with seawater, or from hydrothermal alteration when seawater circulates through hot volcanic rocks.[2]
It is a metasomatic rock with a microscopic or very-fine grain size produced by hydrothermal alteration of basalt, and composed of albite or oligoclase, together with chlorite, epidote, calcite, and actinolite.[3] Spilite is veined by calcite or chalcedony, and vesicles and cavities are filled with secondary minerals.[2] It is generally classed with basalts, and it often retains many textural and structural features characteristic of basalt.[3]
^Manfred Schidlowski: Spilite and the basal tables volcanism. Natural sciences, Bd. 56, No. 10, P. 488-493, Springer publishing house, Berlin/Heidelberg 1969, ISSN 0028-1042
^ abMonica Price, Kevin Walsh, Pocket Nature, Rocks and Minerals, page 63. Dorling Kindersley.
^ abMcGraw-Hill encyclopedia of the geological sciences, page 793
Spilite (from Greek: σπιλάς) is a fine-grained igneous rock, resulting particularly from alteration of oceanic basalt. The term was introduced into the...
of the island, Spilite Arch is a sea-worn arch formed by a pillar of rock 30 m (98 ft) high joined to the coastal cliffs by a spilite sill. Towards the...
can also be rock types without any schistosity, especially metabasalt (spilite). However, basalts may remain quite black if primary pyroxene does not...
Italy Pillow basalt from Baras, Rizal Province, Philippines Pillow basalt Spilite, a fine-grained igneous rock, resulting particularly from the alteration...
plagiogranite. The sedimentary sequence consists of volcanic keratophyre and spilite interbedded with greywacke and argillite. Fossil radiolaria in the argillite...
Low-profile volcano usually formed almost entirely of fluid lava flows Spilite – Fine-grained igneous rock, resulting from alteration of oceanic basalt...
helped to create the weathering conditions to form bauxite, gypsum, clay, spilite, and limestone. The territory covers 56,594 square kilometres (21,851 square...
roundstone conglomerate is common and all beds are tuffaceous. Lithic tuff and spilite are mapped separately. A number of fossil collections have been made from...
became known as the "Steinmann Trinity": the mixture of serpentine, diabase-spilite and chert. The recognition of the Steinmann Trinity served years later...
that have been previously identified as variolites and also classified as spilites, are found in the Durance, France; on Mont Genvre, France; in Devonian...
basalt vents. These, therefore, may represent a type of exhalite chert or spilite. These are subordinate in volume to the shear-hosted forms and are usually...
conglomerate, siltstone and sandstone. In the west are basalt flows, pillowed spilite, prehnite and trachyandesite, as well as shale with radiolarite fossils...
coast Lithology Primary Mudstone Other Siltstone, sandstone, limestone, spilite, hyaloclastite, tuff Location Region England Country United Kingdom Extent...
weathering conditions to form bauxite, gypsum, clay, amphibolite, granite, spilite, gabbro, diabase and limestone. Most of Croatia is lowlands, with elevations...
the Dial Range and Fossey Mountain Troughs, up to 1 km thick. The Motton Spilite lies on top of the chert. It consists of pillow lava, massive lava flows...
|journal= (help) Vallance, T. G. (1974). "Pyroxenes and the Basalt. Spilite Relation". Spilites and Spilitic Rocks. pp. 59–68. doi:10.1007/978-3-642-88230-2_5...
were formed near Ballantrae in Scotland. Here radiolarian cherts overlie spilites and volcanic rocks. Radiolarites are also found in the nearby Southern...
the Mesozoic, an ophiolite zone with serptenized peridotite, diabase, spilite, pillow lava, tuff, argillite and radiolarite formed in the north and is...
Riphean-Cambrian segment of the Vardar Zone, including phyllite, spilite and keratophyre, epidote-chlorite, spilite-mica schist and low-grade metamorphic shales. Ordovician...
politic sediments formed together with volcanic rocks such as keratophyre, spilite, and pyroclastic flows, associated with tholeiitic island arc volcanism...
are less common, mainly basalt, andesite and dacite, transformed into spilite, keratophyre and pyroclastic rocks. Older Triassic rocks and the carbonate...
onset of the Campanian, volcanic rocks occur including basaltic lavas, spilite, and diabase, but also pyroclastic rocks like tuff, lapilli tuff, volcanic...
metasomatism at the time of formation, and the rocks have been referred to as spilites. Such early alteration is possible but most of the effects are now interpreted...
Geologists' Association. In particular she studied chert, serpentines, and spilites. In 1887, her first paper was read to the Geological Society of London...
subdivision of the Devonian period), with small outliers of resistant spilites forming both the ridge on which the church stands and the hills north of...
surface in three places on the Turkmenistan plain. Shale with lenses of spilite, jasper-like rocks and silicified limestone outcrops in the center of the...
The Famennian is composed of clymeniid-bearing shales interbedded with spilites. Mississippian sediments crop out in a band stretching from the Roannais...
(Sakmarian-Roadian) the theoliitic Nar-Tsum(?) produced 300 metres (980 ft) of spilites and Bhote Kosi basalts in southern Tibet. The slightly younger (Artinskian-Kazanian)...
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