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San Jorge Island
San Jorge Island is the second largest island in the Isabel Province, Solomon Islands. Geography The terrain elevation above sea level has been estimated at about 159 metres, but SRTM data shows a maximum elevation of about 470 metres. The island lies at the southern end of Santa Isabel Island and borders Thousand Ships Bay. San Jorge has an area of and has less than 1000 inhabitants living in four villages. The island possesses substantial nickel ore deposites, and international mining companies consider developing mining projects. Also, peridotites associated with pyroxenites, with rare olivine and spinel, are exposed on the island. History The first recorded sighting by Europeans was by the Spanish expedition of Álvaro de Mendaña on 21 April 1568. More precisely the sighting was due to a local voyage done by a small boat, in the accounts the brigantine ''Santiago'', commanded by Maestre de Campo Pedro Ortega Valencia and having Hernán Gallego as pilot. They were who cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isabel Province
Isabel Province (also spelled Ysabel) is one of the provinces of Solomon Islands. The province had a population of around 35,257 as of 2020, mostly concentrated on the main island, Santa Isabel Island. The capital of the province is Buala on Santa Isabel Island, which has scheduled airline services to Honiara on Solomon Airlines from Fera Airport, on Fera Island, a 15-minute boat ride from Buala. The province has an economy dominated by subsistence agriculture with occasional plantations for cash crops such as copra, and by logging activities. The province is seldom visited by tourists due to poor infrastructure, lack of roads, hotels, modern medical care, and endemic malaria. Most areas have a "Rest House", a house where guests can seek accommodation for the night or two, but many residents are willing to take in visitors for the night. Santa Isabel is the longest Island in the Solomon Islands. The first European contact to the Solomon Islands was made by Spanish navigator ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solomon Islands
Solomon Islands is an island country consisting of six major islands and over 900 smaller islands in Oceania, to the east of Papua New Guinea and north-west of Vanuatu. It has a land area of , and a population of approx. 700,000. Its capital, Honiara, is located on the largest island, Guadalcanal. The country takes its name from the wider area of the Solomon Islands (archipelago), which is a collection of Melanesian islands that also includes the Autonomous Region of Bougainville (currently a part of Papua New Guinea), but excludes the Santa Cruz Islands. The islands have been settled since at least some time between 30,000 and 28,800 BCE, with later waves of migrants, notably the Lapita people, mixing and producing the modern indigenous Solomon Islanders population. In 1568, the Spanish navigator Álvaro de Mendaña was the first European to visit them. Though not named by Mendaña, it is believed that the islands were called ''"the Solomons"'' by those who later receiv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SRTM
The Shuttle Radar Topography Mission (SRTM) is an international research effort that obtained digital elevation models on a near-global scale from 56°S to 60°N, to generate the most complete high-resolution digital topographic database of Earth prior to the release of the ASTER GDEM in 2009. SRTM consisted of a specially modified radar system that flew on board the Space Shuttle Endeavour during the 11-day STS-99 mission in February 2000. The radar system was based on the older '' Spaceborne Imaging Radar-C/X-band Synthetic Aperture Radar'' (SIR-C/X-SAR), previously used on the Shuttle in 1994. To acquire topographic data, the SRTM payload was outfitted with two radar antennas. One antenna was located in the Shuttle's payload bay, the other – a critical change from the SIR-C/X-SAR, allowing single-pass interferometry – on the end of a 60-meter (200-foot) mast that extended from the payload bay once the Shuttle was in space. The technique employed is known as interferomet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santa Isabel Island
Santa Isabel Island (also known as Isabel, Ysabel and Mahaga) is the longest in Solomon Islands, the third largest in terms of surface area, and the largest in the group of islands in Isabel Province. Location and geographic data Choiseul lies to the north-west, Malaita to the south-east. The Pacific Ocean lies to the north, and Guadalcanal (Isatabu) to the south. The highest point in Santa Isabel is Mount Sasari, . The Marutho river runs down Mount Sasari to the ocean at Hofi. Almost all the rivers or streams run from that centre point except for those at the other tip of the island on the Katova side. The administrative centre is Buala. The nearest airport is Fera Airport on neighbouring Fera Island. History The first European landing in the Solomon Islands archipelago was made at Santa Isabel Island, by the Spanish explorer Álvaro de Mendaña on 7 February 1568. It was charted as ''Santa Isabel de la Estrella'' (St. Elizabeth of the Star of Bethlehem in Spanish). A set ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thousand Ships Bay
Thousand Ships Bay is a bay located on the south coast of Santa Isabel Island in the Solomon Islands, between San Jorge Island and Santa Isabel Island Santa Isabel Island (also known as Isabel, Ysabel and Mahaga) is the longest in Solomon Islands, the third largest in terms of surface area, and the largest in the group of islands in Isabel Province. Location and geographic data Choiseul lies t .... References * Tideschart.com tide table of Thousand Ships BayTide-Forecast.com tide table of Thousand Ships Bay* Hammond World Travel Atlas''. Union, N.J.: Hammond World Atlas Corporation, c. 2004–2005. . Page 245. * Bays of the Solomon Islands {{Solomons-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peridotites
Peridotite ( ) is a dense, coarse-grained igneous rock consisting mostly of the silicate minerals olivine and pyroxene. Peridotite is ultramafic, as the rock contains less than 45% silica. It is high in magnesium (Mg2+), reflecting the high proportions of magnesium-rich olivine, with appreciable iron. Peridotite is derived from Earth's mantle, either as solid blocks and fragments, or as crystals accumulated from magmas that formed in the mantle. The compositions of peridotites from these layered igneous complexes vary widely, reflecting the relative proportions of pyroxenes, chromite, plagioclase, and amphibole. Peridotite is the dominant rock of the upper part of Earth's mantle. The compositions of peridotite nodules found in certain basalts are of special interest along with diamond pipes (kimberlite), because they provide samples of Earth's mantle brought up from depths ranging from about 30 km to 200 km or more. Some of the nodules preserve isotope ratios of osmi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyroxenite
Pyroxenite is an ultramafic igneous rock consisting essentially of minerals of the pyroxene group, such as augite, diopside, hypersthene, bronzite or enstatite. Pyroxenites are classified into clinopyroxenites, orthopyroxenites, and the websterites which contain both types of pyroxenes (see diagram below). Closely allied to this group are the hornblendites, consisting essentially of hornblende and other amphiboles. They are essentially of igneous origin, though some pyroxenites are included in the metamorphic Lewisian complex of Scotland. The pyroxene-rich rocks, which result from the type of contact metamorphism known as pyroxene-hornfels facies, have siliceous sediment or basaltic protoliths, and are respectively metapelites and metabasites. Intrusive and mantle pyroxenites Igneous pyroxenites are closely allied to gabbros and norites, from which they differ by the absence of feldspar, and to peridotites, which are distinguished from them by containing more than 40% olivine. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Olivine
The mineral olivine () is a magnesium iron silicate with the chemical formula . It is a type of nesosilicate or orthosilicate. The primary component of the Earth's upper mantle, it is a common mineral in Earth's subsurface, but weathers quickly on the surface. For this reason, olivine has been proposed as a good candidate for accelerated weathering to sequester carbon dioxide from the Earth's oceans and atmosphere, as part of climate change mitigation. Olivine also has many other historical uses, such as the gemstone peridot (or chrysolite), as well as industrial applications like metalworking processes. The ratio of magnesium to iron varies between the two endmembers of the solid solution series: forsterite (Mg-endmember: ) and fayalite (Fe-endmember: ). Compositions of olivine are commonly expressed as molar percentages of forsterite (Fo) and fayalite (Fa) (''e.g.'', Fo70Fa30). Forsterite's melting temperature is unusually high at atmospheric pressure, almost , while ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spinel
Spinel () is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula in the cubic crystal system. Its name comes from the Latin word , which means ''spine'' in reference to its pointed crystals. Properties Spinel crystallizes in the isometric system; common crystal forms are octahedra, usually twinned. It has no true cleavage, but shows an octahedral parting and a conchoidal fracture. Its hardness is 8, its specific gravity is 3.5–4.1, and it is transparent to opaque with a vitreous to dull luster. It may be colorless, but is usually various shades of red, lavender, blue, green, brown, black, or yellow. Some spinels are among the most famous gemstones; among them are the Black Prince's Ruby and the "Timur ruby" in the British Crown Jewels, and the "Côte de Bretagne", formerly from the French Crown jewels. The Samarian Spinel is the largest known spinel in the world, weighing . The transparent red spinels were called spinel-rubies or b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Petrology
The ''Journal of Petrology'' is a monthly peer-reviewed academic journal focused on the field of igneous and metamorphic petrology and petrogenesis. The journal is published by the Oxford University Press and indexed in the Science Citation Index. The editor-in-chief is Georg Zellmer (Massey University). Abstracting and indexing The journal is abstracted and indexed in: *Aquatic Sciences and Fisheries Abstracts *Chemical Abstracts *CAB Abstracts *Current Contents/Physical, Chemical and Earth Sciences *GEOBASE * ProQuest databases *Science Citation Index According to the ''Journal Citation Reports'', the journal has a 2020 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as i ... of 4.515. References External links * English-language journals 1960 establishments in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Álvaro De Mendaña De Neira
Álvaro de Mendaña y Neira (or Neyra) (1 October 1542 – 18 October 1595) was a Spanish navigator and discoverer, best known for two of the earliest recorded expeditions across the Pacific in 1567 and 1595. His voyages led to the discovery of the Marquesas, Cook Islands and Solomons among other archipelagos. Born in Congosto, in El Bierzo Region ( León), he was the nephew of Lope García de Castro, viceroy of Peru. Search for Terra Australis Between 1565 and 1605, three important Spanish voyages of exploration left Peru bound for the southwest Pacific. One inspiration for these voyages was Spanish soldier Pedro Sarmiento de Gamboa who arrived in Peru in 1557. Sarmiento de Gamboa developed an interest in Inca stories of gold and riches being collected from lands further to the west. Sarmiento's proposal for an expedition to find land in the Pacific was put to Governor Lope García de Castro, finding favour as it matched common Spanish belief in the existence of a great South ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brigantine
A brigantine is a two-masted sailing vessel with a fully square-rigged foremast and at least two sails on the main mast: a square topsail and a gaff sail mainsail (behind the mast). The main mast is the second and taller of the two masts. Older usages are looser; in addition to the rigorous definition above (attested from 1695), the ''Oxford English Dictionary'' has about 1525 definitions of "a small vessel equipped both for sailing and rowing, swifter and more easily manœuvred than larger ships" and "(loosely) various kinds of foreign sailing and rowing vessels, as the galleon, galliot, etc." Modern American definitions include vessels without the square sails on the main mast. Mediterranean brigantines In the Mediterranean Basin during the 13th century, a brigantine referred to a sail- and oar-driven war vessel. It was lateen rigged on two masts and had between eight and twelve oars on each side. Its speed, maneuverability, and ease of handling made it a favourite of Mediter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
