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Durham University

Department of Earth Sciences

Profile

Publication details for Professor Yaoling Niu

Batiza, R., Niu, Yaoling, Karsten, J.L., Boger, W., Potts, E., Norby, L. & Butler, R. (1996). Steady and non-steady state magma chambers below the East Pacific Rise. Geophysical Research Letters 23(3): 221-224.

Author(s) from Durham

Abstract

Volcanic rocks collected on flowline traverses on the flanks of the East Pacific Rise (EPR) document changes in axial magma chemistry with time, providing a record of the thermal history of axial magma chambers (AMC). We present data for a sample set of closely spaced (1–2 km) samples along EPR flowlines at three localities out to ∼800 ka showing both steady (constant average temperature) and non-steady state behavior of magma chambers on time scales of 200–500 ka. Though based on only three symmetrical traverses so far, it appears that magmatically robust ridge locations (11°20′N and 9°30′N) have steady state chambers, whereas a magmatically starved axis (10°30′N) shows large temperature changes with time. These observations provide a new petrologic perspective to the ongoing debate regarding the significance and causes of morphologic variations along the axis of the East Pacific Rise.