Look up diabase in Wiktionary, the free dictionary.
Diabase (/ˈdaɪ.əˌbeɪs/), also called dolerite (/ˈdɒl.əˌraɪt/) or microgabbro,[1]
is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grained to aphanitic chilled margins which may contain tachylite (dark mafic glass).
Diabase is the preferred name in North America, while dolerite is the preferred name in the rest of the English-speaking world, where sometimes the name diabase refers to altered dolerites and basalts. Some geologists prefer to avoid confusion by using the name microgabbro.
The name diabase comes from the French diabase, and ultimately from the Greek διάβασις – meaning "act of crossing over, transition".[2] whereas the name dolerite comes from the French dolérite, from the Greek doleros (“deceitful, deceptive”), because it was easily confused with diorite
^
"BGS Rock Classification Scheme - Dolerite (Synonymous with Microgabbro)". British Geological Survey. Retrieved 24 August 2015.
^"diabase". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
Look up diabase in Wiktionary, the free dictionary. Diabase (/ˈdaɪ.əˌbeɪs/), also called dolerite (/ˈdɒl.əˌraɪt/) or microgabbro, is a mafic, holocrystalline...
the diabasic portion and are composed of a distinct type of rock called Diabase-Schist-Tuff, as noted in earlier geological research. However, more recent...
The York Haven Diabase is a rock formation in Pennsylvania, United States. It underlies the Rossville Diabase and is Jurassic in age. The formation is...
University. Wherry theorized that the ringing was due to the texture of the diabase rocks and that they were supported by other rocks. He identified the boulder...
The Diabase Hills are a mountain range in Washoe County, Nevada. "Diabase Hills". Geographic Names Information System. United States Geological Survey...
as black granite. In geological terms, black granite might be gabbro, diabase, basalt, diorite, norite, or anorthosite. Morales Demarco, Manuela; Oyhantçabal...
and diabase. They are sometimes only a fraction of an inch in thickness, resembling a thin layer of pitch or tar on the edge of a crystalline diabase dike...
pyroxene, amphibole, and biotite. Common mafic rocks include basalt, diabase and gabbro. Mafic rocks often also contain calcium-rich varieties of plagioclase...
Subvolcanic rocks include diabase (also known as dolerite) and porphyry. Common examples of subvolcanic rocks are diabase, quartz dolerite, microgranite...
The Nipissing sills, also called the Nipissing diabase, is a large 2217– to 2210–million year old group of sills in the Superior craton of the Canadian...
of this igneous rock. There is very little coarser-grained gabbro and diabase. Nephelinite is exposed on the islands but is extremely rare. The majority...
extrusive igneous rock. Types of trap rock include basalt, peridotite, diabase, and gabbro. Trap is also used to refer to flood (plateau) basalts, e.g...
Magma was injected between layers of sedimentary rock, forming diabase sills. This hard diabase protects the layers of sedimentary rock below, forming the...
properly referred to as diabase (also called dolerite) or, when more coarse-grained (crystals over 2 mm across), as gabbro. Diabase and gabbro are thus the...
sandstone, shale and mudstone. The conglomerate includes clasts of basalt, diabase, gabbro, peridotites, and schists. Overlying the Loreto Formation is the...
completed until 1700. It has 4-5 metre thick walls made of granite, gneiss and diabase. Skansen Kronan was never attacked, and the cannons were never fired in...
of a valley temple, now buried beneath the village of Nazlet el-Samman; diabase paving and nummulitic limestone walls have been found but the site has...
body, dark red denotes a pyrite-chalcopyrite ore body, green is a gabbro diabase, lamprophyre and quartz porphyry dike, and light tan is the Supraore sequence...
years ago. Along the river, the Palisades are of metamorphic basalt, or diabases, the Highlands are primarily granite and gneiss with intrusions, and from...
large body of diabase in central Montgomery County, Maryland, is known as the Boyds Sill, named after the town of Boyds. Jurassic diabase boulders in the...
Contact between a dark-colored diabase dike (about 1100 million years old) and light-colored migmatitic paragneiss in the Kosterhavet National Park in...
basin rift lake system. The main ridge in Sourland Mountain is intrusive diabase (a type of igneous rock) associated with the same igneous event that produced...
designated a National Natural Landmark, being "the best example of a thick diabase sill in the United States". It underlies a portion of northwest Staten...
some sections by one-quarter and the area of its base by four fifths. The diabase rock was used as building material in growing areas like Jersey City. The...
Global Information
