关键词: 纳尔逊岛, 火山岩, 地层对比, 火山作用, 次火山岩

Abstract: The Stansbury Peninsula, Nelson Island, a neighbor of Fildes Peninsula, on which the Chinese Great Wall Station is located, is covered with basaltic, basalt-andesitic lavas and breccias' as well as fossiliferous volcanic-sedimentary clastic rocks. Based on the stratigra-phical relationship and the petrological characteristics the author considers that the strati-gsaphical division of volcanic rocks on Stansbury Peninsula is much similar to that in Fildes Peninsula. The volcanic rocks and volcanic-sedimentary clastic rocks are the products of two stages of volcanism and can be stratigraphically subdivided into three members. At the first stage agglomerates and breccias, interbedding basaltic, basalt-andesitic lavas and breccias formed successively, which are comparable with that of Jasper Hill plus Agate Beach Members in Fildes Peninsula. Before the end of this stage some subvolcanic intrusives appeared. The flora-bearing volcanic sedimentary clastic rocks belonging to Fossil Hill Member as found on Fildes Peninsula represent a long time break of volcanic activities on the peninsula. A lots of agglomeratic lavas and breccia on the volcanic sediments near the east coast of peninsula showes that the centre of volcanic activities of the second stage had migrated eastwards. The similar development of volcanic strata and the discovery of plant fossils provided an evidence for such a suggestion that the volcanic rocks on Stansbury Peninsula and on Fildes Peninsula resulted from the same regional volcanism in the Early Tertiary. The faults on the peninsula parallel to the Fildes Strait Fault are the main structure and control the distribution of subvolcanic intrusives in the Peninsula.