VOLCANISM IN THE BRANSFIELD STRAIT, ANTARCTICA

被引：40

作者：

FISK, MR

机构：

[1] College of Oceanography, Oregon State University, Corvallis

来源：

JOURNAL OF SOUTH AMERICAN EARTH SCIENCES | 1990年 / 3卷 / 2-3期

关键词：

D O I：

10.1016/0895-9811(90)90022-S

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Back-arc and marginal basins make up a significant portion of the earth's crust and they can represent the transition from continental to oceanic crust. The Bransfield Strait is a young marginal basin of the arc-trench system that lies off the northwestern edge of the Antarctic Peninsula. The strait is about 65 km wide and has a maximum water depth of 2000 m. "Active" volcanoes in the Bransfield Strait include two seamounts, which are south of the eastern end of King George Island, and three island volcanoes - Penguin, Deception, and Bridgeman Islands. Alkaline and calc-alkaline suites occur on these islands, and the seamounts are composed of tholeiites and basaltic andesites. This diversity is similar to that found in some back-arc basins, but the Bransfield Strait basalts as a group cannot be classified as back-arc basin or island-arc basalts. The diverse rock types and the chemical similarity of some of the Bransfield Strait basalts to ophiolite basalts suggests that some ophiolites were generated in back-arc basins. © 1990.

引用

页码：91 / 101

页数：11

共 46 条

[1]

Albee, Ray, Correction factors for electron probe microanalyses of silicates, oxides, carbonates, phosphates and sulfides, Analytical Chemistry, 43, pp. 1408-1414, (1970)

[2]

Ashcroft, Crustal Structure of the South Shetland Islands and Bransfield Strait, British Antarctic Survey, Scientific Report, 66, (1972)

[3]

Barker, The Cenozoic subduction history of the Pacific margin of the Antarctic Peninsula: Ridge crest-trench interactions, Journal of the Geological Society of London, 139, pp. 787-801, (1982)

[4]

Barker, Dalziel, Progress in geodynamics of the Scotia Arc region, Geodynamics of the Eastern Pacific Region, Caribbean and Scotia Arcs, 9, pp. 137-170, (1983)

[5]

Bence, Albee, Empirical correction factors for electron microanalysis of silicates and oxides, The Journal of Geology, 76, pp. 382-403, (1968)

[6]

Birkenmajer, The Penguin Island volcano, South Shetland Islands (Antarctica): Its structure and succession, Studia Geologica Polonica, 74, pp. 155-173, (1982)

[7]

Birkenmajer, Keller, Pleistocene age of Melville Peak volcano, King George Island, West Antarctica, by KAr dating, Journal of Volcanology and Geothermal Research, (1990)

[8]

Carmichael, The petrology of Thingmuli—A Tertiary volcano in eastern Iceland, Journal of Petrology, 5, pp. 435-460, (1964)

[9]

Cassignol, Gillot, Range and effectiveness of unspiked potassium-argon dating: Experimental groundwork and applications, Numerical Dating in Stratigraphy, pp. 159-179, (1982)

[10]

Cohen, O'Nions, Identification of recycled continental material in the mantle from Sr, Nd and Pb isotopic investigations, Earth and Planetary Science Letters, 61, pp. 73-84, (1982)

← 1 2 3 4 5 →