Petrology of Volcanic Rocks Recovered on DSDP Leg 19 from the North Pacific Ocean and the Bering Sea

Stewart, Richard J.; Natland, James H.

doi:10.2973/dsdp.proc.19.114.1973

Cited by 18 publications

(20 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus the samples may be transitional. The chemistry of the Site 883 basalts is quite similar to that of the DSDP Site 192 (Meiji Seamount) basalt, which was tentatively classified based upon mineralogy as an alkali basalt (Stewart et al, 1973), but later analyses of glass and pyroxene in the sample suggested that it may be tholeiitic (Dalrymple et al, 1980). The composition of the Site 883 basalts is equally as ambiguous.…”

Section: Site 883mentioning

confidence: 63%

Geochemistry and 40Ar/39Ar Geochronology of Basalts from ODP Leg 145 (North Pacific Transect)

Keller¹,

Duncan²,

Fisk³

1995

Proceedings of the Ocean Drilling Program, 145 Scientific Results

View full text Add to dashboard Cite

Leg 145 of the Ocean Drilling Program recovered basalts at three locations in the North Pacific. Drilling at Sites 883 and 884 on Detroit Seamount, near the northern end of the Emperor seamount chain, penetrated altered pillow basalts that may be of transitional composition (Site 883) and thick flows of tholeiitic composition (Site 884). The Site 883 basalts did not yield a reliable crystallization age, but a basalt from Site 884 yielded an age of 81 Ma. This is the first reliable radiometric age determination for the northern end of the Emperor Seamounts, and lengthens the period of known activity of the Hawaiian-Emperor seamount chain by approximately 15 million years. Published Pacific-plate-motion models predict an age for Detroit Seamount of approximately 65 to 75 Ma. Either the 81 Ma tholeiite is from very early in the history of an unusually long-lived volcano, or the velocity of the Pacific plate relative to the Hawaiian hotspot increased some time between 81 and 65 Ma.Drilling at Site 885 was expected to reach Lower? Cretaceous oceanic crust near the Chinook Trough in the central North Pacific. Basalt was contacted beneath less than one-half of the expected thickness of sediments. The basalt is altered, but appears to have a mid-ocean ridge tholeiite composition. It yielded a concordant 40 Ar/ 39 Ar plateau age of only 80 Ma, suggesting that volcanism associated with the Late Cretaceous plate reorganization and formation of the Chinook Trough affected a wider area than previously thought.Drilling at Site 887 on the Patton-Murray seamount platform in the Gulf of Alaska recovered transitional basalts overlain by two chemically distinct types of alkalic basalts. The Site 887 basalts are chemically similar to samples dredged from other seamounts in the northeast Pacific. 40 Ar/ 39 Ar dating of an alkalic basalt midway in the section yielded an age of 27 Ma. The uppermost basalt recovered is a sediment-bounded sill that yielded an 40 Ar/ 39 Ar age of 17 Ma. Thus, volcanic activity at this seamount platform spanned at least 10 million years.

show abstract

Section: Site 883mentioning

confidence: 63%

Geochemistry and 40Ar/39Ar Geochronology of Basalts from ODP Leg 145 (North Pacific Transect)

Keller¹,

Duncan²,

Fisk³

1995

Proceedings of the Ocean Drilling Program, 145 Scientific Results

View full text Add to dashboard Cite

show abstract

“…Drilling on DSDP Leg 19 recovered ∼13m of pillow basalt. The altered whole rock compositions are alkalic [ Stewart et al , 1973], but subsequent analysis of a glassy sample by Dalrymple et al [1980] showed that the samples may be altered tholeiitic basalt. An age of 85 Ma was inferred by Keller et al [2000], but no reliable radiometric ages are available.…”

Section: Resultsmentioning

confidence: 99%

Origin of depleted components in basalt related to the Hawaiian hot spot: Evidence from isotopic and incompatible element ratios

Frey

Huang

Blichert‐Toft

et al. 2005

Geochem Geophys Geosyst

View full text Add to dashboard Cite

[1] The radiogenic isotopic ratios of Sr, Nd, Hf, and Pb in basaltic lavas associated with major hot spots, such as Hawaii, document the geochemical heterogeneity of their mantle source. What processes created such heterogeneity? For Hawaiian lavas there has been extensive discussion of geochemically enriched source components, but relatively little attention has been given to the origin of depleted source components, that is, components with the lowest 87 Sr/ 86 Sr and highest 143 Nd/ 144 Nd and 176 Hf/ 177 Hf. The surprisingly important role of a depleted component in the source of the incompatible element-enriched, rejuvenated-stage Hawaiian lavas is well known. A depleted component also contributed significantly to the 76-81 Ma lavas erupted at Detroit Seamount in the Emperor Seamount Chain. In both cases, major involvement of MORB-related depleted asthenosphere or lithosphere has been proposed. Detroit Seamount and rejuvenated-stage lavas, however, have important isotopic differences from most Pacific MORB. Specifically, they define trends to relatively unradiogenic Pb isotope ratios, and most Emperor Seamount lavas define a steep trend of 176 Hf/ 177 Hf versus 143 Nd/ 144 Nd. In addition, lavas from Detroit Seamount and recent rejuvenatedstage lavas have relatively high Ba/Th, a characteristic of lavas associated with the Hawaiian hot spot. It is possible that a depleted component, intrinsic to the hot spot, has contributed to these young and old lavas related to the Hawaiian hot spot. The persistence of such a component over 80 Myr is consistent with a long-lived source, i.e., a plume. (2005), Origin of depleted components in basalt related to the Hawaiian hot spot: Evidence from isotopic and incompatible element ratios, Geochem. Geophys. Geosyst., 6, Q02L07,

show abstract

“…The basalt has a similar geo chemistry (e.g., 17 ppm Ba) to MORB, such as found in hole 304, and is unlikely to be a back arc tholeiite as proposed by Stewart et al (1973) (cf., Ishizuka et al, 1990). The low 87Sr/86Sr (0.70279), which is identical to the value given in von Drach et al (1986), is also consistent with MORB.…”

Section: Sr-isotope Ratiosmentioning

confidence: 98%

Role of subducted sediments in the genesis of Kurile-Kamchatka island arc basalts: Sr isotopic and elemental evidence.

Bailey

1996

Geochem. J.

View full text Add to dashboard Cite

Petrology of Volcanic Rocks Recovered on DSDP Leg 19 from the North Pacific Ocean and the Bering Sea

Cited by 18 publications

References 18 publications

Geochemistry and 40Ar/39Ar Geochronology of Basalts from ODP Leg 145 (North Pacific Transect)

Geochemistry and 40Ar/39Ar Geochronology of Basalts from ODP Leg 145 (North Pacific Transect)

Origin of depleted components in basalt related to the Hawaiian hot spot: Evidence from isotopic and incompatible element ratios

Role of subducted sediments in the genesis of Kurile-Kamchatka island arc basalts: Sr isotopic and elemental evidence.

Contact Info

Product

Resources

About