Textural and geochemical characteristics of Fe−Mn crusts from four seamounts near the Marshall Islands, western Pacific

2005 ◽  
Vol 9 (4) ◽  
pp. 331-338 ◽  
Author(s):  
Jonguk Kim ◽  
Kiseong Hyeong ◽  
Chan Min Yoo ◽  
Jai-Woon Moon ◽  
Ki-Hyune Kim ◽  
...  
Keyword(s):  
Geochemical Characteristics ◽  
Marshall Islands ◽  
Western Pacific

scholarly journals Paleomagnetic investigation of seamounts in the vicinity of Ogasawara Fracture Zone northwest of the Marshall Islands, western Pacific

2003 ◽  
Vol 55 (6) ◽  
pp. 355-360 ◽  
Author(s):  
Tae-Gook Lee ◽  
Sang-Mook Lee ◽  
Jae-Woon Moon ◽  
Kiehwa Lee
Keyword(s):  
Fracture Zone ◽  
Marshall Islands ◽  
Western Pacific

Poecilostomatoid Copepods associated with the Scleractinian coral Acropora in the tropical western Pacific Ocean

1993 ◽  
Vol 7 (4) ◽  
pp. 805 ◽  
Author(s):  
AG Humes
Keyword(s):  
Pacific Ocean ◽  
Scleractinian Coral ◽  
New Records ◽  
New Caledonia ◽  
Marshall Islands ◽  
Western Pacific ◽  
Western Pacific Ocean ◽  
New Genera ◽  
Tropical Western Pacific ◽  
Enewetak Atoll

Nine new lichomolgid copepods, including two new genera, Ecphysarion and Unicispina, are described, all associated with various species of the scleractinian genus Acropora in New Caledonia, at Ceram and Obi in the Moluccas, and at Enewetak Atoll in the Marshall Islands: Schedomolgus idanus, S. majusculus, S. insignellus, S. exiliculus, Scyphuliger eumorphus, S. aristoides, Ecphysarion ampullulum, E. spinulatum, and Unicispina latigenitalis. New records are given for Ecphysarion lobophomm (Humes & Ho, 1968), comb. nov., Scyphuliger concavipes Humes, 1991, S. manifestus Humes, 1991, and S. tenuatus (Humes, 1990).

scholarly journals Gato hyalinus gen. et sp. nov., an unusual araphid tube-dwelling diatom from Western Pacific and Caribbean islands

Phytotaxa ◽  
2013 ◽  
Vol 127 (1) ◽  
pp. 22 ◽  
Author(s):  
CHRISTOPHER S. LOBBAN ◽  
J. NELSON NAVARRO
Keyword(s):  
Puerto Rico ◽  
New Species ◽  
Coral Reef ◽  
Marshall Islands ◽  
Western Pacific ◽  
Caribbean Islands ◽  
Valve Structure ◽  
First Time ◽  
A New Species ◽  
Apical Axis

A new species of tube-dwelling diatom, unusual in being araphid, is described from benthic coral reef habitats in Guam, Palau, Puerto Rico and Jamaica. Gato gen. nov. is heteropolar and heterovalvar, exhibits very fine striae delimiting a narrow and irregular sternum, and possesses a series of rimmed pores on each side of the foot pole. One valve of the frustule has a rimoportula at the foot pole, but both valves possess a rimoportula at the head pole. The generitype, G. hyalinus sp. nov. forms small, branched colonies. Individual cells are oval, slightly tapered along the apical axis, 30–40 µm x 13–15 µm, with 60–70 striae in 10 µm. On the foot pole with a rimoportula the rimmed pores are connected to the sternum by diagonal striae; several additional rimmed pores interrupt transapical striae further up both valves. We compare valve structure of G. hyalinus with Florella portoricensis and F. pascuensis, which we report for the first time from the Marshall Islands, and to Licmophora spp. We find no taxa to which this genus is related, and can identify no structure potentially homologous to the series of rimmed pores among the diatoms.

scholarly journals 40Ar/39Ar Ages and Geochemistry of Seamount Basalts from the Western Pacific Province

2022 ◽  
Vol 10 (1) ◽  
pp. 54
Author(s):  
Qian Liu ◽  
Limei Tang ◽  
Ling Chen ◽  
Peng Gao
Keyword(s):  
Geochemical Characteristics ◽  
Western Pacific ◽  
Primitive Mantle ◽  
Magma Source ◽  
Ocean Island Basalts ◽  
The Pacific ◽  
Three Samples ◽  
Formation And Evolution ◽  
Geochemical Profiles ◽  
The Western Pacific

Seamounts are features generated by hot spots and associated intraplate volcanic activity. The geochemical characteristics of igneous rocks constituting seamounts provide evidence of important details of dynamic processes in the Earth, such as mantle magma source areas, and are key to understanding how mantle plume processes control the formation and evolution of seamounts and their resulting geochemical characteristics. The Pacific Ocean contains a large number of hitherto unstudied seamounts, whose ages and geochemical characteristics remain poorly known. This study presents the geochemical characteristics of six basalt samples from five seamounts in the Western Pacific and the 40Ar/9Ar ages of three samples are determined. The new analysis yielded 40Ar/39Ar ages for seamounts samples MP3D21, MP5D11, and MP5D15A of 95.43 ± 0.33, 62.4 ± 0.26, and 99.03 ± 0.4 Ma, respectively. The geochemical profiles of seamounts samples MP3D04, MP3D21, MP5D11, MP5D15A, MPID201, and MPID202 are consistent with alkaline basalts, as evidence by alkali-rich, silicon-poor compositions along with high titanium concentrations. The primitive mantle normalized rare-earth elements and trace elements spider pattern are similar to those of ocean island basalts. The Ta/Hf and Nb/Zr ratios and La/Zr-Nb/Zr discriminant diagrams indicate that the six seamounts formed from magma that originated in the deep mantle.

Geochemical characteristics and metal element enrichment in crusts from seamounts of the Western Pacific

2015 ◽  
Vol 10 (1) ◽  
pp. 171-182
Author(s):  
Xiaoyu Zhang ◽  
Kechao Zhu ◽  
Yong Du ◽  
Fuyuan Zhang ◽  
Weiyan Zhang ◽  
...  
Keyword(s):  
Geochemical Characteristics ◽  
Western Pacific ◽  
Metal Element ◽  
Element Enrichment ◽  
The Western Pacific

scholarly journals Total Field Magnetic Analysis of Nine Seamounts Northwest of the Marshall Islands, Western Pacific

2002 ◽  
Vol 24 (3) ◽  
pp. 197-205
Author(s):  
Tae-Gook Lee ◽  
Sang-Mook Lee ◽  
Jae-Woon Moon ◽  
Kie-Hwa Lee
Keyword(s):  
Marshall Islands ◽  
Western Pacific ◽  
Total Field ◽  
Magnetic Analysis

scholarly journals A root for massive crown-of-thorns starfish outbreaks in the Pacific Ocean

2021 ◽  
Author(s):  
Nina Yasuda ◽  
June Inoue ◽  
Michael R. Hall ◽  
Manoj R. Nair ◽  
Mehdi Adjeroud ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Environmental Changes ◽  
French Polynesia ◽  
The Philippines ◽  
Marshall Islands ◽  
Western Pacific ◽  
Central Pacific ◽  
The Pacific ◽  
The Pacific Ocean ◽  
The Western Pacific

AbstractRecurring outbreaks of crown-of-thorns starfish (COTS) severely damage healthy corals in the Western Pacific Ocean. To determine the source of outbreaking COTS larvae and their dispersal routes across the Western Pacific, complete mitochondrial genomes were sequenced from 243 individuals collected in 11 reef regions. Our results indicate that Pacific COTS comprise two major clades, an East-Central Pacific clade (ECP-C) and a Pan-Pacific clade (PP-C). The ECP-C consists of COTS from French Polynesia (FP), Fiji, Vanuatu and the Great Barrier Reef (GBR), and does not appear prone to outbreaks. In contrast, the PP-C, which repeatedly spawns outbreaks, is a large clade comprising COTS from FP, Fiji, Vanuatu, GBR, Papua New Guinea, Vietnam, the Philippines, Japan, Micronesia, and the Marshall Islands. Given the nature of Pacific Ocean currents, the vast area encompassing FP, Fiji, Vanuatu, and the GBR likely supplies larvae for repeated outbreaks, exacerbated by anthropogenic environmental changes, such as eutrophication.

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