Latest Igneous rocks Stories
VANCOUVER, July 2 /PRNewswire-FirstCall/ - Anglo Platinum Limited ("Anglo Platinum") (JSE: AMS) and Anooraq Resources Corporation ("Anooraq") (TSXV: ARQ; NYSE Amex: ANO; JSE: ARQ) announces that all of the conditions precedent to the acquisition by Anooraq of an effective 51% interest in the Lebowa Platinum Mine from Anglo Platinum have been fulfilled. The transaction has accordingly been implemented in accordance with the terms and conditions of the agreements entered into between, among...
Billions of years of history have been uncovered with a new technique that is helping scientists paint a picture of how Earth's continents were arranged. Scientists are using the new method to recover rare minerals from rocks and analyze their composition. In addition, researchers claim they can accurately date ancient volcanic rocks for the first time. The early landmasses can be pieced together by aligning rocks that have a similar age and orientation. Scientists say the new approach will...
Hawaii's Kilauea volcano seems to be active again, with molten lava moving around 300 feet under the crater's floor.The growth of the Halemaumau crater corroborates scientists' certainty that the lava is near the summit, said Janet Babb, a geologist and spokeswoman at the U.S. Geological Survey's Hawaiian Volcano Observatory.Park rangers have started allowing the overlook at the Jaggar Museum to stay open later in the evening to have capacity for the larger numbers of visitors to see the...
According to a new study, volcanic eruptions in what is now present-day China may have been the cause of mass extinction 260 million years ago.The Guadalupian Mass Extinction, which devastated marine life around the world, was preceded by eruptions in the Emeishan province of Southwest China, said Paul Wignall, paleontologist from the University of Leeds.According to the report, which appears in Friday's edition of the journal Science, the eruption in China unleashed nearly a half million...
- Lebowa Technical Review completed - Revised Production Scheduling and Cost Estimates - Revised Lebowa Life of Mine plan (100%) Indicates Positive Net Present Value VANCOUVER, May 14 /PRNewswire-FirstCall/ - Anooraq Resources Corporation ("Anooraq" or the "Company") (TSXV: ARQ; NYSE Amex: ANO; JSE: ARQ) announces that, together with Anglo Platinum Limited ("Anglo Platinum") (referred to collectively as "the parties"), it has completed the technical review of...
U.S. and French scientists say they have discovered the origin of carbon-based lavas erupting from a Tanzanian volcano. The researchers, led by the University of New Mexico, analyzed gas samples collected from inside the active crater of Tanzania's Oldoinyo Lengai volcano -- the only volcano that is actively producing carbon-based lavas. The geochemical analyses revealed a very small degree of partial melting of minerals in the Earth's upper mantle is the source of the rare carbon-derived...
Two volcanoes near a major city in eastern Congo have begun showing evidence of intense volcanic activity - tremors, pools of lava and plumes of smoke - causing some residents flee the area, MSNBC reported.Scientists who visited the two volcanic peaks of Nyiragongo and Nyamulagira said on Thursday the volcanoes could be near eruption and would threaten Goma, a city with a population of more than half a million people. Dieudonne Wafula, the head of Goma's Volcanological Observatory, said the...
Carbon dioxide completely "disappears" into the atmosphere at all other volcanoes on EarthScience has unearthed the secret to what might have been alchemy at Oldoinyo Lengai volcano in Tanzania.There, in the ancient East African Rift at a place known to local Maasai people as the Mountain of God, Oldoinyo Lengai spews forth carbon dioxide-laden lavas called carbonatites. The carbonatites line the volcano's flanks like snowballs.Oldoinyo Lengai is the only place on Earth where...
Scientists who have just returned from an expedition to an erupting undersea volcano near the Island of Guam report that the volcano appears to be continuously active, has grown considerably in size during the past three years, and its activity supports a unique biological community thriving despite the eruptions.An international science team on the expedition, funded by the National Science Foundation (NSF), captured dramatic new information about the eruptive activity of NW...
Scientists who have just returned from an expedition to an erupting undersea volcano near the Island of Guam report that the volcano appears to be continuously active, has grown considerably in size during the past three years, and its activity supports a unique biological community thriving despite the eruptions.An international science team on the expedition, funded by the National Science Foundation (NSF), captured dramatic new information about the eruptive activity of NW...
Latest Igneous rocks Reference Libraries
Biotite is a common phyllosilicate mineral that contains potassium, magnesium, iron and aluminium. It is sometimes called "iron mica" and is found in granitic rocks, gneisses, and schists. Like other mica minerals, biotite has a highly perfect basal cleavage, its flexible sheets easily flaking off. It has a hardness of 2.5 - 3, a specific gravity of 2.7 - 3.1, is colored greenish to brown or black, and can be transparent to opaque. Biotite is occasionally found in large sheets, especially in...
Diorite is a grey to dark grey intermediate intrusive igneous rock composed principally of plagioclase feldspar (typically andesine), hornblende, and/or pyroxene. Varieties deficient in hornblende and other dark minerals are called leucodiorite. It is often described as "salt and pepper" when composed largely of light-colored minerals randomly interspersed with dark minerals. When olivine and more iron-rich augite are present, the rock grades into ferrodiorite, which is transitional to...
Gabbro is a dark, coarse-grained, intrusive igneous rock chemically equivalent to basalt. It is a plutonic rock, formed when molten magma is trapped beneath the Earth's surface and cools slowly into a hard, coarsely crystalline mass. It is dense, greenish or dark-colored and contains varied percentages of plagioclase feldspar, pyroxene, amphibole, and olivine (called olivine gabbro when olivine is present in large quantities). Quartz gabbros are also known to occur and are probably derived...
Peridotite is a dense, coarse grained ultrabasic rock, consisting mainly of the minerals olivine and pyroxene. Peridotite is also a group of mantle derived igneous rocks. They all are ultramafic or ultrabasic meaning they contain less than 45% silica and are high in iron and magnesium. Members of the peridotite family include: Dunite - predominately composed of olivine, with minor enstatite pyroxene and chromite. Harzburgite - composed of olivine, enstatite, and minor chromite....
Rhyolite is an igneous, volcanic (extrusive) rock, of felsic composition, with aphanitic to porphyritic texture. Mineral assembly is usually quartz, alkali feldspar and plagioclase (in a ratio > 1:2). Biotite and pyroxene are common accessory minerals. Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock. Due to their high content of silica, rhyolite form highly viscous lavas. They can also occur as breccias or in volcanic necks and dikes. Like obsidian,...
