Regional variation of 87Sr/86Sr ratios and mineral compositions of sediment from the Ross Sea, Antarctica

Shaffer, Nelson R.; Faure, Gunter

doi:10.1130/0016-7606(1976)87<1491:rvosra>2.0.co;2

Cited by 21 publications

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“…The Sr concentrations of sediment in the upper portions of cores from the Ross Sea generally increase from east to west in the direction of the coast of Victoria Land and Ross Island (Shaffer & Faure 1976). This trend is displayed also by the average Sr concentrations of the sediment above the disconformity in cores 32-36 (Sr= 115 ppm) and 32-16 (Sr= 120 ppm).…”

Section: Resultsmentioning

confidence: 99%

“…3). The samples of Holocene sediment do not define a mixing line, but appear to fit the equation derived by Shaffer & Faure (1976) sialic component is probably greater than 0·726 (highest value reported by Shaffer & Faure 1976), but should be less than 0·735. The upper limit implies an average age of about 875 million years for the bedrock in the area drained by ice of the Ross Ice Shelf, based on an initial 87Sr/86Sr ratio of 0·704 and an average Rb/Sr of 0·882 for sediment in the two cores.…”

Section: Interpretation Of 87srj86sr Ratiosmentioning

confidence: 99%

“…That of the sialic component (87Sr/86Sr =0'730±0'005) is 90± 13 ppm. The corresponding values for these components in the Holocene sediment, as calculated by means of the mixing equation of Shaffer & Faure (1976), are: Sr=567± 143 ppm for the volcanic component and Sr= 79 +: 13 ppm for the sialic component. From these results, the Sr concentrations of the sialic components in the late Pliocene and Holocene sediment are indistinguishable from each other.…”

Section: Interpretation Of 87srj86sr Ratiosmentioning

confidence: 99%

“…The 87Srj 86S r ratios and Sr concentrations (Table 1) can be used to estimate the concentrations of volcanogenic detritus by means of a two-component mixing model developed by Boger & Faur (1974;1976) and Shaffer & Faure (1976). The mixing equations were derived by fitting straight lines to the data points in coordinates of 87Srj86Sr and IjSr (Fig.…”

Section: Interpretation Of 87srj86sr Ratiosmentioning

confidence: 99%

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Sources and abundance of volcanogenic sediment in piston cores from the Ross Sea, Antarctica

Kovach

Faure

1977

New Zealand Journal of Geology and Geophysics

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The 87Srj86Sr ratios and Sr concentrations of detrital silicate fractions of sediment of late Pliocene to Holocene age in the Ross Sea are controlled by the presence of varying proportions of volcanogenic detritus. A quantitative interpretation of the data in terms of a two-component mixing model leads to the conclusion that Mesozoic and Cenozoic volcanics of West Antarctica were the principal source of volcanogenic detritus in sediments of late Pliocene age. A thin and discontinuous layer of Holocene sediment contains much lower concentrations of volcanic detritus of basaltic composition.

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Section: Resultsmentioning

confidence: 99%

Section: Interpretation Of 87srj86sr Ratiosmentioning

confidence: 99%

Section: Interpretation Of 87srj86sr Ratiosmentioning

confidence: 99%

Section: Interpretation Of 87srj86sr Ratiosmentioning

confidence: 99%

See 2 more Smart Citations

Sources and abundance of volcanogenic sediment in piston cores from the Ross Sea, Antarctica

Kovach

Faure

1977

New Zealand Journal of Geology and Geophysics

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“…The viewpoints of previous workers have ranged from optimism to pessimism. At the time of deposition, sand, silt, and clay particles are not usually equilibrated with ambient Sr or among themselves (Dasch 1969;Shaffer and Faure 1976). Authigenic minerals can grow in equilibrium with local Sr in solution (Clauer 1976(Clauer ,1979.…”

Section: Dating Of Sedimentary Rocks By Rb-srmentioning

confidence: 98%

Sr isotopic study of Helikian sediment and diabase dikes in the Athabasca Basin, northern Saskatchewan

Armstrong¹,

Ramaekers²

1985

Can. J. Earth Sci.

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The Athabasca Group overlles 1.8 Ga or older basement of the Churchill Province and predates uranium mineralization at 1.3 Ga. Cross-cutring diabase dikes have been dated by Rb-Sr mineral isochrons at 1.3 1 2 0.07 Ga at Diabase Peninsula, Cree Lake, and 1.16 t 0.04 Ga at Lazy Eklward Bay. Cree Lake. Initial "Sr/''Sr ratios for these dikes are 0.7040 2 0.0005 and 0.7036 k 0.002, respectively. Clastic sedimentary rocks d the Athabasca Group normally show limited variation in Rb/Sr and variable initial "Sr/""Sr. Sedimentary rocks in two areas near the northern margin of the Athabasca Basin scatter about isochrons of 2.6 Ga. reflecting Archean provenance af detrital material and lack of Sr isotopic homogenization since deposition. Sediment of the tuffaccous Wolverine Point Formation, near Rumpel Lake, IS much more variable in Rb/Sr and enriched in Rb relative to Sr and defines a 1.43 2 0.03 Ga isochron with a 0.7057 2 0.0005 initial ratio. This is possibly the age of deposition of the Athabasca Group.LC groupe d'Athabasca recouvre un swle Pgd de 1,8 Ga, ou plus ancien, de la province de Churchill et rtvele que la mininlisation en uranium fut mise en piace anlkrieurement B 1,3 Ga. Les dykes de diabase coupant le groupe ont tte dates B I'aide des isochrones Rb-Sr dc mintraux 21 1.3 1 & 0.07 Ga a la p6ninsule Dlabase, lac Cree, et a 1,16 2 0,04 Ga a la baie Lazy Edward, lac Cree. Les rapports initiaux *'Sr/"Sr F u r ces dykes sont 0,7040 * 0,0005 et 0,7036 * 0,0002, respectivement. Les mches ~Cdirncnfaires clast~qucs du g r o u~ d'Athabasca presentent normalement peu de variation du Rb/Sr et un H7Sr/X'~r initial variable. Lrs rnches ddirnentaires dans deux rtgions pres de la limite nord du bassin d'Athabasca Tournissent des isochrones qavitant autour de 2.6 Ga, tkmoignant de la provenance archkenne des matkriaux detritiques et de I'hCt6rogikit& imtopique du Sr depuis I'accurnulation des ddiments. Le mattriel sedimentaire composant la formation tufacke de Wolverine Point, prks du Iac Rurnpd, fournit un Rb/Sr beaucoup plus variable et est enrichie en Rb relativement au Sr et dCfio11 un isochrone 5 1,43 2 0.03 Cia avec un rapport initial de 0,7057 2 0,0005. Ce qui correspond possiblement a I'bge dc sckfimentntion du gmupe d'Athabasca.[Traduit par le journal]Can.

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Glaciaton of Southern Victoria Land

Faure

Mensing

2010

The Transantarctic Mountains

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Regional variation of 87Sr/86Sr ratios and mineral compositions of sediment from the Ross Sea, Antarctica

Cited by 21 publications

References 0 publications

Sources and abundance of volcanogenic sediment in piston cores from the Ross Sea, Antarctica

Sources and abundance of volcanogenic sediment in piston cores from the Ross Sea, Antarctica

Sr isotopic study of Helikian sediment and diabase dikes in the Athabasca Basin, northern Saskatchewan

Glaciaton of Southern Victoria Land

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