Geochronologic evidence for Early Cretaceous volcanic activity on Barton Peninsula, King George Island, Antarctica SCIE SCOPUS

Cited 16 time in WEB OF SCIENCE Cited 19 time in Scopus
Title
Geochronologic evidence for Early Cretaceous volcanic activity on Barton Peninsula, King George Island, Antarctica
Author(s)
Kim, H; Lee, JI; Choe, MY; Cho, M; Zheng, XS; Sang, HQ; Qiu, J
Publication Year
2000
Abstract
Ages of six volcanic and plutonic rocks on Barton Peninsula, King George Island, were determined using Ar-40/Ar-39 and K-Ar isotopic systems. The Ar-40/Ar-39 and K-Ar ages of basaltic andesite and diorite range from 48 My to 74 My and systematically decrease toward the upper stratigraphic section, Two specimens of basaltic andesite which occur in the lowermost sequence of the peninsula, however, apparently define two distinct plateau ages of 52-53 My and 119-120 My, The latter is interpreted to represent the primary cooling age of basaltic andesite, whereas the former is interpreted as the thermally-reset age caused by the intrusion of Tertiary granitic pluton, The isochron ages calculated from the isotope correlation diagram corroborate our interpretation based on the apparent plateau ages, It is therefore likely that volcanism was active during the Early Cretaceous on Barton Peninsula, When the K-Ar ages of previous studies are taken into account with our result, the ages of basaltic andesite in the northern part of the Barton Peninsula are significantly older than those in the southern part. Across the north-west-south-east trending Barton fault bounding the two parts, there are significant differences in geochronologic and geologic aspects.
ISSN
0800-0395
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/6099
DOI
10.1111/j.1751-8369.2000.tb00347.x
Bibliographic Citation
POLAR RESEARCH, v.19, no.2, pp.251 - 260, 2000
Publisher
NORWEGIAN POLAR INST
Subject
SOUTH-SHETLAND ISLANDS; CENTRAL LIVINGSTON ISLAND; GEOCHEMICAL CONSTRAINTS; AGE
Type
Article
Language
English
Document Type
Article
Publisher
NORWEGIAN POLAR INST
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