Quaternary Glaciomarine Sedimentation Interpreted from Seismic Surveys of Fiords on Baffin Island, N.W.T.
Quaternary Glaciomarine Sedimentation Interpreted from Seismic Surveys of Fiords on Baffin Island, N.W.T.
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根据西北地区巴芬岛峡湾地震勘测解释的第四纪冰川沉积物
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发表时间：
1985
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通讯作者：
R. Gilbert
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作者：
R. Gilbert
在巴芬岛的九个峡湾中使用压缩空气源进行的地震反射勘测提供了有关沉积物数量以及沉积与晚第四纪冰期期间事件的关系的信息。在地震记录中可以识别出五种沉积相：（A）冰接触冰川沉积物的基底相，包括冰碛和变形的、分层的冰海沉积物，（B）沉积在冰附近环境中的分层良好的沉积物的下部冰海相，（C）沉积在远离冰川沉积物源的较低能量环境中的声学透明沉积物相，（D）上部，与相B相似的分层良好的相，也被解释为冰近的，以及（E）在其它物质之上的现代沉积物的薄相。这些相初步与巴芬岛东部的冰川事件。A相和B相与福克斯期早期（> 50，000 BP）巴芬岛外海岸和大陆架的冰川退缩有关。D相与早全新世Cockburn亚期冰川的再进形成巴芬兰冰碛有关。在这些事件之间的较长时期内，居间相C与较低的能量条件和较少的沉积物输入有关，相E与峡湾中的当前环境有关。关键词：巴芬岛，峡湾，沉积学，连续地震剖面，第四纪冰川
Seismic reflection surveys using a compressed air source in nine fiords on Baffin Island provide information on the amounts of sediment deposited and the relation of sedimentation to events during late Quaternary glaciation. Five sedimentary facies can be recognised in the seismic records: (A) a basal facies of ice contact glacial sediment including moraines and deformed, stratified, glaciomarine sediment, (B) a lower glaciomarine facies of well-stratified sediment deposited in an ice-proximal environment, (C) a facies of acoustically transparent sediment deposited in a lower energy environment farther from sources of glacial sediment, (D) an upper, well-stratified facies similar to facies B and also interpreted as ice-proximal, and (E) a thin facies of modern sediment on top of the other materials. These facies are tentatively correlated with glacial events on eastern Baffin Island. Facies A and B are associated with the retreat of glaciers from the outer coast and continental shelf of Baffin Island during the early Foxe Period (>50,000 BP). Facies D is associated with the readvance of glaciers to form the moraines of the Baffinland drift during the Cockburn Substage of the Early Holocene. The intervening Facies C is associated with lower energy conditions and less sediment input in a long period between these events, and Facies E with the present environment in the fiords. Key words: Baffin Island, fiords, sedimentology, continuous seismic profiling, Quaternary glaciation