Geologic map of southeastern Alaska
Geologic map of southeastern Alaska
复制标题
阿拉斯加东南部地质图
DOI：
10.3133/ofr84886
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
H. C. Berg
中科院分区：
文献类型：
--
作者：
G. Gehrels;H. C. Berg
阿拉斯加东南部被第四纪地表沉积和沉积、火山岩、侵入岩和变质岩所覆盖，其年龄从第四纪到元古界(？)。我们根据它们的年龄和岩石类型，而不是它们的正式名称，将这些岩石划分为地图单位，以努力强调岩石相似且一般同时代的地质单位的区域分布。地图单元的分布、岩性成分、时代、地层或侵入关系、变质作用和构造特征将在下面的地图单元描述中描述。地图单位的年代显示在地图单位的相关性上，单位的一般岩石类型列在地图单位的描述中(见地图表)。表1引用了阿拉斯加东南部所有正式承认的地质单位，以及我们的地图单位和发现它们的地理区域。
INTRODUCTION Southeastern Alaska is underlain by Quaternary surficial deposits and by sedimentary, volcanic, intrusive, and metamorphic rocks ranging in age from Quaternary to Proterozoic(?). We have classified these rocks into map units on the basis of their age and lithic type, rather than their formally recognized names, in an effort to emphasize the regional distribution of lithically similar and generally coeval geologic units. The distribution, lithic components, age, stratigraphic or in~sive relations, and metamorphic and structural characteristics of the map units are described below in the Description of Map Units. The ages of map units are shown on the Correlation of Map Units, and the general lithic types of the units are listed in the Description of Map Units (see map sheet). Table 1 references all formally recognized geologic units in southeastern Alaska to our map units and to the geographic regions in which they are found.