A probable meteorite origin for Mistastin Lake, Labrador

A probable meteorite origin for Mistastin Lake, Labrador
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拉布拉多米​​斯塔斯汀湖可能的陨石起源

DOI:
10.1139/e69-004
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发表时间:
1969
影响因子:
1.4
通讯作者:
M. Dence
M. Dence
中科院分区:
地球科学4区
文献类型:
--
作者:
F. C. Taylor;M. Dence

文献摘要

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拉布拉多的米斯塔斯丁湖(Mistastin Lake),北纬55°53′,西经63°18′,是一个大致呈圆形的湖泊,中央有一个巨大的岛屿,位于明显的洼地中。中央岛斜长岩和二长花岗岩的冲击变质特征和破裂以及西海岸平坦火成岩中的包裹体表明陨石撞击成因。该陨石坑的原始直径约为20公里,全岩K-Ar测定的年龄为2.02 ± 25亿年。    
Mistastin Lake, Labrador, latitude 55°53′ N, longitude 63°18′ W, is a roughly circular lake with a large central island lying in a marked depression. A meteorite impact origin is indicated by shock metamorphism features and fracturing of anorthosite and adamellite on the central island and of inclusions in flat-lying igneous rocks on the western shore. The crater had an original diameter of about 20 km and an age, by whole-rock K–Ar determination, of 202 ± 25 m.y.