Models of Along Axis Segmentation and Across Axis Structure of Mid-Ocean Ridges

PI研究了大洋中脊构造和构造的两个问题：亚脊地幔底辟作用的机制和海脊正断层演化的控制。他已经证明，与亏损相关的密度变化本身不太可能是地幔底辟的原因，但熔融和熔体通过地幔隆起下方的上涌而渗漏产生的浮力可能会导致底辟。建议进一步研究熔体相关粘度在这一过程中的作用。将考虑解释沿EPR观测到的地壳厚度变化所需的地幔条件，并与MAR沿线的观测结果进行比较。有关正断层机制的研究成果将应用于山脊构造问题。

Two problems of mid-ocean ridge structure and tectonics have been investigated by the PI: the mechanism of sub-ridge mantle diapirism, and the controls on normal fault evolution at a ridge. He has shown that depletion-related density variations alone are an unlikely cause of mantle diapirism, but that buoyancy resulting from melting and melt percolation through mantle upwelling below a ridge can lead to diapirism. Further work is proposed to look at the role of melt related viscosity in this prosess. The mantle conditions needed to explain observations of crustal thickness variations along the EPR, in contract to those along the MAR, will be considered. The results about the mechanisms of normal faulting will be applied to the problem of ridge tectonics.