DOI: 10.1038/ngeo2012
论文题名: Motion in the north Iceland volcanic rift zone accommodated by bookshelf faulting
作者: Green R.G. ; White R.S. ; Greenfield T.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 1 起始页码: 29
结束页码: 33
语种: 英语
英文摘要: Along mid-ocean ridges the extending crust is segmented on length scales of 10-1,000 km. Where rift segments are offset from one another, motion between segments is accommodated by transform faults that are oriented orthogonally to the main rift axis. Where segments overlap, non-transform offsets with a variety of geometries accommodate shear motions. Here we use micro-seismic data to analyse the geometries of faults at two overlapping rift segments exposed on land in north Iceland. Between the rift segments, we identify a series of faults that are aligned sub-parallel to the orientation of the main rift. These faults slip through left-lateral strike-slip motion. Yet, movement between the overlapping rift segments is through right-lateral motion. Together, these motions induce a clockwise rotation of the faults and intervening crustal blocks in a motion that is consistent with a bookshelf-faulting mechanism, named after its resemblance to a tilting row of books on a shelf. The faults probably reactivated existing crustal weaknesses, such as dyke intrusions, that were originally oriented parallel to the main rift and have since rotated about 15clockwise. Reactivation of pre-existing, rift-parallel weaknesses contrasts with typical mid-ocean ridge transform faults and is an important illustration of a non-transform offset accommodating shear motion between overlapping rift segments. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106440
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, United Kingdom
Recommended Citation:
Green R.G.,White R.S.,Greenfield T.. Motion in the north Iceland volcanic rift zone accommodated by bookshelf faulting[J]. Nature Geoscience,2014-01-01,7(1)