New data on the structure of the sedimentary section on the Ita Mai Tai Guyot (Magellan Seamounts,Pacific Ocean)

The geological-prospecting investigations carried out by scientists from the Yuzhmorgeologiya State Scientific Center in the eastern segment of the Magellan Seamounts of the Pacific during the cruise of the R/V Gelendzhik in 2003–2010 brought new data on the topography of the Ita Mai Tai Guyot and its Lower Cretaceous-Pleistocene sedimentary section. The guyot is characterized by its complex irregular morphology with angular outlines being complicated by numerous relief mesoforms: spurs, scarps, and volcanic cones and domes. It is shown that the sedimentary cover was formed during a long period. The analysis of the organic macro- and microfaunal remains from the sedimentary rocks made it possible to define transgressive phases in the guyot’s development: the Albian-Cenomanian, the Late Campanian-Maastrichtian, and the late Paleocene-early Eocene. The oolitic limestone sequence recovered by DSDP Hole 202 is determined to be the Albian in age. Based on the original and published data, the geological development of the guyot was analyzed in comparison with other similar structures of the Magellan Seamounts.     

Ore Content of Cobalt-Rich Ferromanganese Crusts of the Govorov Guyot of the Magellanic Mountains of the Pacific Ocean

Doklady Earth Sciences - The main ore minerals of all layers of cobalt-rich ferromanganese crusts of Guyot Govorov of the Magellanic Mountains of the Pacific Ocean are poorly crystallized, poorly...     

Cobalt-Rich Ferromanganese Crusts of the Govorov Guyot of the Magellan Seamounts of the Pacific Ocean: Conditions of Occurrence,Mineralogy, and Geochemistry

Oceanology - The article describes the geological conditions of the formation of cobalt-rich ferromanganese crusts on the Govorov guyot in the Magellan Seamount system of the Pacific Ocean. It is...     

New data on the morphology and geological structure of the Gramberg Guyot (Magellan Seamounts, Pacific Ocean)

The geological-geophysical studies carried out in the western part of the Pacific Ocean by the State Research Center “Yuzhmorgeologiya“ during cruises of the R/V “Gelendzhik” in 2002–2004 yielded new data on the relief of the Gramberg Guyot and its constituting rocks, which appeared to be Early Cretaceous to Pleistocene in age. The analysis of macro- and microfaunal remains in sedimentary rocks made it possible to define the transgressive phases in the development of seamounts (the Cenomanian-Turonian, Late Campanian-Maastrichtian, and Late Cenozoic). The geological development of the Gramberg Guyot is compared with that of other similar structures of the Magellan Seamounts.     

New geological and paleontological data on Alba Guyot (Magellan Seamounts, Pacific Ocean)

New materials obtained in the Pacific during cruises of the R/V Gelendzhik carried out by the State Scientific Center Yuzhmorgeologiya in 2000–2001 make it possible to specify the geologic and geomorphologic structure of Alba Guyot and clarify lithological and paleontological characteristics of lithotectonic rock complexes ranging from the Early Cretaceous to Pleistocene in age. Based on macro-and microfossils from sedimentary rocks several “transgressive” phases are distinguished in the guyot development: Cenomanian-Turonian, late Campanian-Maastrichtian, late Paleocene-middle Eocene, and Late Cenozoic. Finds of Paleogene molluscan and coral remains, together with planktonic foraminifers, imply relatively shallow sedimentation settings on Alba Guyot during the early Paleocene.     

Volcanic edifices on guyots of the Magellan Seamounts (Pacific Ocean)

Analysis of detailed bathymetric charts and records of phototelevision profiling over the surfaces of the guyots of the Magellan Seamounts reveals many cones and domes. Their diameters and heights vary from a few hundreds of meters to 10 km and from 30 to 350 m, respectively. The age generations of these mesomorphic structures correspond to the Campanian–Maastrichtian, Late Paleocene–Eocene, and Miocene. The formation of complicating volcanic edifices is most likely determined by late phases of volcanic activity related to differentiation of magmatic melts. At the same time, the tectonic factor responsible for their formation is also sufficiently well evident: volcanic edifices on plateau summits are associated spatially with linear morphostructures and lineaments.