A global review of non-living resources on the extended continental shelf

Murton, Bramley J.

doi:10.1590/s0102-261x2000000300007

Cited by 11 publications

(7 citation statements)

References 37 publications

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“…Marine heavy mineral placer deposits, including gold, diamond, zircon, garnet, rutile, cassiterite, xenotime, magnetite, and monazite, are distributed worldwide on beaches, in coastal waters, and on continental shelves (Baturin, 2000;Murton, 2000;Rona, 2003). These heavy mineral deposits are increasingly recognized as important supplements to continental endogenic ore deposits or as important sources of some disperse metals; for example, the main source of metallic zirconium from zircon placers.…”

Section: Introductionmentioning

confidence: 99%

Using zircon U–Pb ages to constrain the provenance and transport of heavy minerals within the northwestern shelf of the South China Sea

Zhong

Yan

et al. 2017

Journal of Asian Earth Sciences

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Numerous ore-grade heavy mineral placer deposits occur in the northern South China Sea region. Previous studies on these deposits have focused on the heavy-mineral ore resources themselves, but the provenance and transport pathways of these heavy minerals are poorly constrained. This paper presents U-Pb ages of detrital zircons from sediments within the northwestern shelf of the South China Sea, and uses this new dataset to determine the provenance and transport pathway of the sediments. Zircons in sediments from ten areas of the northwestern shelf exhibit distinct age populations, suggesting that they have multiple provenances. Zircons in sediments from the Pearl River Mouth, Shangchuan Island, and Moyang River Mouth areas all have an obvious peak of Mesozoic ages, indicating that they have similar sediment

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Section: Introductionmentioning

confidence: 99%

Using zircon U–Pb ages to constrain the provenance and transport of heavy minerals within the northwestern shelf of the South China Sea

Zhong

Yan

et al. 2017

Journal of Asian Earth Sciences

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“…Em períodos em que o nível do mar se encontrava abaixo do atual, depósitos de minerais pesados podem ter se formado na margem da plataforma continental e, em determinados casos, com a subseqüente elevação do nível marinho, muito desses depósitos foram soterrados por sedimentos transgressivos (Kudras, 1987(Kudras, , 2000 apud Murton, 2000). A posterior exposição destes depósitos possibilitou seu retrabalhamento pela ação das correntes e das ondas, sendo depositados nas praias como resultado da migração transgressiva da atual linha de costa (Souza, 2004).…”

Section: Proveniência Dos Minerais Deóxidos De Fe-ti Da Praia Do Pântunclassified

Proveniência dos minerais de óxidos de Fe-Ti nas areias da praia do Pântano do Sul, ilha de Santa Catarina (SC), sul do Brasil

2007

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ABSTRACT. The sandy sediments of the Pântano do Sul beach, located in South coast of Santa Catarina island, have significant concentrations of heavy minerals, especially Fe-Ti oxides minerals (ilmenite and magnetite). In intention to discuss the source area of these minerals, comparison holding texture and chemistry of ilmenite and magnetite of the beach sediments and basic dykes was realized. Beach samples were impregnated, studied by thin sections and the electronic microprobe. The database includes 66 analysis from the beach sands and 72 from nearby outcrops. The use of electronic microprobe showed that ilmenite presents wide chemical variability and diverse provenance, originated from diabases and granitic and acid volcanic lithotypes that constitute the rocky coasts of the island. The ilmenite sandy sediments were arranged in four groups of similar chemical composition, correlationed to adjacent basic dykes. Considering the totality of ilmenite and magnetite grains; 4,6% were derived from dike 1; 7% from dike 2; 7% from dike 3; 16,3% from dike 4 and 55,8% from another source, possibly from granitic or volcanic acid rocks, while 9,3% of the grains showed deriving from dike 3 or dike 4. Therefore the chemical comparison of ilmenite in Pântano do Sul sandy sediments and lithotypes of the Santa Catarina island was very useful to determinate the sedimentary provenance of ilmenite sandy grains.Keywords: provenance indicators, ilmenite, mineral chemistry, sandy beach. RESUMO.Nos sedimentos arenosos da praia do Pântano do Sul, situada ao sul da ilha de Santa Catarina, ocorrem significativas concentrações de minerais pesados, principalmente minerais deóxidos de Fe-Ti (ilmenita e magnetita). Com o objetivo de discutir a proveniência desses minerais, fez-se uma comparação entre as texturas e a química de grãos de minerais deóxidos de Fe-Ti (ilmenitas e magnetitas) da areia praial e de minerais deóxidos de Fe-Ti de quatro diques básicos, eleitos como rochas fonte prováveis. Amostras de areia de praia foram impregnadas com resina e estudadas, sob a forma de lâminas delgadas e em microssonda eletrônica.Foram realizadas 66 análises micro químicas em areias de praia e 72 em afloramentos rochosos vizinhos. As análises químicas desses minerais, com microssonda eletrônica, mostraram que os grãos de ilmenita possuem um amplo espectro de variação de composição química, o que aponta para uma procedência variada, advinda não somente de diques básicos, mas provavelmente também de rochas graníticas e vulcânicasácidas que constituem os costões rochosos da ilha. Composicionalmente, os grãos de ilmenita das areias agruparam-se em quatro conjuntos congruentesà composição química das ilmenitas dos quatro diques básicos acima referidos. Do total de grãos de ilmenita e magnetita analisados, 4,6% apontaram para proveniência a partir do dique 1; 7% do dique 2; 7% do dique 3, 16,3% do dique 4 e 55,8% de outras fontes, possivelmente rochas graníticas ou vulcânicasácidas, enquanto que 9,3% dos grãos mostraram-se provenientes ou do dique 3 ou d...

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“…At the time of this writing, the United States was in the process of establishing a program to delineate the US Extended Continental Shelf (ECS) estimated to exceed 1 million square kilometers and to include energy and mineral resources with an estimated value in excess of $1 trillion (Murton et al, 2001). While the US ECS program, the criteria necessary to submit a claim, and the requisite research are not the direct subjects of this paper, recent events demonstrate a direct link between ocean exploration and a nation's ocean and coastal resources.…”

Section: Oceanography December 2007 21mentioning

confidence: 99%

Ocean Exploration: Discovery and Offshore Stewardship

Kendall¹,

Ahlfeld²,

Boland³

et al. 2007

Oceanog.

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and a blue, white, and red titanium flag rests on the soil of an alien world. The explorers who planted it, tucked safely within the confines of their twin vehicles, are safe from a deadly temperature and pressure differential but miles from any other human contact. Moments later, both craft lift off and head skyward, mission accomplished, but the risks are far from over as they head upward, looking to dock with their mother ship.These were not outer-space vehicles landing on a world orbiting another star or even our own, but vehicles exploring Earth's inner space-the seafloor beneath the North Pole. The submersibles, Mir-I and Mir-II, and the explorers they protected, were the first ever to visit this hostile and unforgiving landscape. Having reached a depth of over 4,200 m, the submersibles made their way back to the surface to locate the break in the ice from which they started. Not finding this point of entry would have the same ramifications of being marooned on a far, distant world.This expedition was much more than an act of national pride and was not without precedent. According to Russian Foreign Minister Sergei Lavrov, this spectacular, and then controversial, journey was an attempt "to show that our shelf reaches to the North Pole.

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A global review of non-living resources on the extended continental shelf

Cited by 11 publications

References 37 publications

Using zircon U–Pb ages to constrain the provenance and transport of heavy minerals within the northwestern shelf of the South China Sea

Using zircon U–Pb ages to constrain the provenance and transport of heavy minerals within the northwestern shelf of the South China Sea

Proveniência dos minerais de óxidos de Fe-Ti nas areias da praia do Pântano do Sul, ilha de Santa Catarina (SC), sul do Brasil

Ocean Exploration: Discovery and Offshore Stewardship

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