GLACIOMARINE DELTAIC DEPOSITION AND ICE-MARGINAL TECTONICS - THE LOCH DON SAND MORAINE, ISLE OF MULL, SCOTLAND

被引：23

作者：

BENN, DI

EVANS, DJA

机构：

[1] Department of Geography and Geology, University of St Andrews, St Andrews, Fife

[2] Department of Geography and Topographic Science, University of Glasgow, Glasgow

[3] Department of Geography, University of Aberdeen, Aberdeen

来源：

JOURNAL OF QUATERNARY SCIENCE | 1993年 / 8卷 / 04期

关键词：

GILBERT-TYPE DELTA; GLACIOTECTONICS; SEA-LEVEL CHANGE; DEVENSIAN; LOCH LOMOND READVANCE;

D O I：

10.1002/jqs.3390080402

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

Detailed descriptions are given of sediments exposed in the 'Loch Don Sand Moraine', Isle of Mull, Scotland. Two distinct sediment-landform associations occur within the 'moraine': (i) a Gilbert-type glaciomarine delta complex graded to ca. 34 m Ordnance Datum; and (ii) thrust moraines consisting of deformed sands and silts. Whereas previous studies have attributed the 'moraine' to a single glacial readvance, this paper shows that the delta and the thrust moraines formed during ice-sheet deglaciation and the Loch Lomond Readvance, respectively. Depositional conditions and the palaeoenvironment for each stage of 'moraine' formation are reconstructed. During the Loch Lomond Readvance, till deposition and thrust moraine formation appear to have been controlled by drainage conditions in the marginal zone of the glacier.

引用

页码：279 / 291

页数：13

共 51 条

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