Tararin, I. A. and Karp, B. Ya. (2000): K voprosu o sostave i vozraste magmaticheskikh porod podnyatiya Obrucheva (Tikhiy okean) Problem of composition and age of magmatic rocks of Obruchev Rise (Pacific Ocean)

Leg/Site/Hole:
ODP 145
DSDP 19
DSDP 19 192
ODP 145 883
Identifier:
2009-026788
georefid
Creator:
Tararin, I. A.
Rossiyskaya Akademiya Nauk, Dal'nevostochnoye Otdeleniye, Tikhookeanskiy Okeanologicheskiy Institut, Vladivostok, Russian Federation
author
Karp, B. Ya.
author
Identification:
K voprosu o sostave i vozraste magmaticheskikh porod podnyatiya Obrucheva (Tikhiy okean) Problem of composition and age of magmatic rocks of Obruchev Rise (Pacific Ocean)
2000
Tikhookeanskaya Geologiya = Pacific Geology
Nauka, Novosibirsk, Russian Federation
19
3
49-54
The analysis and critical assessment of data from the literature on the Obruchev Rise, located in the northern termination of the Hawaiian-Emperor volcanic chain, are evidence that the rise is built by strongly altered tholeiitic basaltoids of the shield stage of Hawaiian-type volcanism with a minimal age of 61.9 + or - 5 Ma. This age is in agreement with Maastrichtian (hole 192, Meidzi guyot) and Campanian (hole 883, Detroit Plateau) age of sedimentary rock occurring on the erosion surface of the basal basement. The subalkaline basalts--hawaiites and mugearites, detected by dredging of subordinated craters of the Detroit Plateau, signify the post-shield stage of hawaiian-type volcanism. It is assumed that tholeiitic basalts with an Rb-Sr radioisochrone age of 49.0 Ma, dredged at hole 2649 on the Meidzi guyot, are geochemically distinct from tholeiites of the shield stage of hawaiian type, show a great similarity to the Eocene tholeiites of the complex from the basement of the Attu Island, Aleutian island arc, and may belong to products of glacial delivery.
Russian
Serial
Coverage:Geographic coordinates:
North:53.0035
West:164.4248East: 167.4607
South:51.1155
Igneous and metamorphic petrology; Geochronology; absolute age; age; Attu Island; basalts; Cretaceous; Deep Sea Drilling Project; DSDP Site 192; East Pacific; Emperor Seamounts; Hawaiian Ridge; igneous rocks; Leg 145; Leg 19; Mesozoic; mid-ocean ridge basalts; North Pacific; Northeast Pacific; Northwest Pacific; Obruchev Rise; Ocean Drilling Program; ODP Site 883; Pacific Ocean; Rb/Sr; Upper Cretaceous; volcanic rocks; volcanism; West Pacific;
.