Criteria for identifying structures related to true crustal extension in orogens
Criteria for identifying structures related to true crustal extension in orogens
复制标题
识别与造山带真实地壳伸展相关的结构的标准
DOI：
10.1016/0191-8141(94)90083-3
复制
发表时间：
1994
影响因子：
3.1
通讯作者：
R. Butler
中科院分区：
文献类型：
--
作者：
J. Wheeler;R. Butler
Faults and shear zones in orogens may be related to crustal shortening or extension or both. True extensional structures should ultimately intersect the Earth's surface when traced out in a direction opposite to that of hangingwall transport; the present dip of a fault in an orogen, and its relation to local layering, are unreliable guides. The observation of low-pressure metamorphic rocks structurally above high-pressure metamorphic rocks isnot sufficientto diagnose crustal extension. A valid metamorphic criterion is the difference in pressure-timehistoriesbetween footwall and hangingwall: if the footwall was decompressing faster than the hangingwall during shear zone movement, then the shear zone was truly extending the crust. The pressure-time history can be constrained via the temperature-time and pressure-temperature histories. Ideally, crustal extension inferred from structural data should be confirmed using diagnosticPTtinformation.
