A new relationship between subsidence rate and zero‐age depth
A new relationship between subsidence rate and zero‐age depth
复制标题
沉降率与零龄深度之间的新关系
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
D. Hayes
中科院分区：
文献类型：
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作者：
Kimberlee A. Kane;D. Hayes
在三个不同大洋的洋中脊系统中，已记录了零年龄地壳的沉降速率与轴部深度之间的关系。这两个参数之间存在一种系统性的线性关系。浅的零年龄深度与高沉降速率相关，深的零年龄深度与低沉降速率相关。对于所有三个大洋，线性沉降速率与零年龄深度的趋势具有相似的斜率，但它们的零年龄深度截距相差几百米。各个沉降速率和零年龄深度值相对于每条线性趋势的离散程度因大洋而异，并且与每个洋中脊系统长期存在的大规模分段的情况和程度有关。通常用于量化沉降速率的一维热传导模型无法解释所观测到的关系。先前用于解释长期构造分段的一个定性模型，通过假设分别存在约20°C到约170°C的平均区域和局部地幔温度变化，也能够解释沉降速率与零年龄深度的关系以及相关的差异。
The relationship between subsidence rates and axial depths for zero-age crust has been documented along the mid-ocean ridge systems of three separate oceans. A systematic, linear relationship exists between these two parameters. Shallow zero-age depths are associated with high subsidence rates, and deep zero-age depths are associated with low subsidence rates. The linear subsidence rate versus zero-age depth trends have similar slopes for all three oceans, but their zero-age depth intercepts are offset by a few hundred meters. The scatter of individual subsidence rate and zero-age depth values about each linear trend varies from ocean to ocean and is related to the presence and extent of long-lived, large-scale segmentation of each mid-ocean ridge system. One-dimensional thermal conduction models typically used to quantify subsidence rates cannot account for the observed relationships. A qualitative model that was used previously to explain long-lived tectonic segmentation can also explain the subsidence rate versus zero-age depth relationships and associated variance by assuming the existence of average regional and local mande temperature variations of ∼20°C to ∼170°C, respectively.