Comment on: "Crustal strength in central Tibet determined from Holocene shoreline deflection around Siling Co" by Xuhua Shi, Eric Kirby, Kevin P. Furlong, Kai Meng, Ruth Robinson and Erchie Wang
Comment on: "Crustal strength in central Tibet determined from Holocene shoreline deflection around Siling Co" by Xuhua Shi, Eric Kirby, Kevin P. Furlong, Kai Meng, Ruth Robinson and Erchie Wang
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评论：“根据色林措周围全新世海岸线偏转确定的西藏中部地壳强度” 作者：Xuhua Shi、Eric Kirby、Kevin P. Furlong、Kai Ming、Ruth Robinson 和 Erchie Wang
DOI：
10.1016/j.epsl.2015.08.042
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发表时间：
2016
影响因子：
5.3
通讯作者：
England P
中科院分区：
文献类型：
--
作者：
England P
Shi et al.（2015）分析了西藏中部思岭措周围古海岸线的高程分布，假设一个模型，其中表面载荷完全由覆盖在无粘性流体上的弹性盖支撑。他们的结论是，弹性盖的厚度为20-30 km，并且为了使该模型中的无粘性基底假设有效，弹性盖下方地壳的粘性必须小于1-2× 10 19 Pa·s。在这里，我们放松假设的无粘性下地壳，并表明，海岸线海拔的分布可以解释由一个厚的弹性盖或高粘度的下地壳。在无粘下地壳的极限下，弹性盖的厚度必须大于25至39公里。如果弹性盖比这更薄，那么下面地壳的粘度必须至少为5× 1019至2× 1020 Pa·s，这取决于湖泊加载的时间间隔。
Abstract Shi et al.(2015) analysed the distributions of elevation of palaeoshorelines around Siling Tso, central Tibet assuming a model in which surface loads are entirely supported by an elastic lid overlying an inviscid fluid. They concluded that the thickness of the elastic lid is 20–30 km and that, for the assumption of an inviscid substrate in this model to be valid, the viscosity of the crust below the elastic lid must be less than 1–2× 10 19 Pa s. Here we relax the assumption of an inviscid lower crust and show that the distribution of shoreline elevations may be explained either by a thick elastic lid or by high viscosity in the lower crust. In the limit of an inviscid lower crust, the thickness of the elastic lid must be greater than 25 to 39 km. If the elastic lid is thinner than this, then the viscosity of the crust beneath must be at least 5× 10 19 to 2× 10 20 Pa s, depending on the time interval over which the lake was loaded.