Dr. Ming Hao [Carnegie Institution for Science, USA]

Title: The visibility of eclogitic materials in the deep Earth

Language:  English presentation

Time: 10:30AM - 12:00PM, Monday, August 5, 2024

Place:  Onsite：Conference room A417, HPSTAR (Beijing)             Online:  Tencent Meeting: https://meeting.tencent.com/dm/zvbKyNxIe5Dl  Meeting ID: 495-535-183

Host:  Prof. Renbiao Tao

Abstract:

Identifying and locating the geochemical and geophysical heterogeneities in the Earth’s interior is one of the most important and challenging tasks for the deep Earth scientists. Subducted and delaminated crustal materials metamorphize into the dense eclogite in the upper mantle and is considered as a major cause of geochemical and geophysical heterogeneities in the deep Earth. In order to detect eclogitic materials inside the Earth, precise measurements of the high pressure-temperature single-crystal elasticity of major minerals in eclogite are thus exceedingly important. Na,Al-bearing clinopyroxenes constitute up to 75 vol.% of eclogite. We performed the high pressure-temperature single-crystal elasticity measurements of omphacite and jadeite using Brillouin spectroscopy. Based on the new experimental results, we modeled the seismic properties of eclogitic materials in the Earth’s upper mantle, proving the visibility constraints for seismic observations.

Biography of the Speaker:

I am a mineral physicist with a primary research focus on delving into the intricate compositions and structures of both Earth and other planets. My work revolves around high pressure and temperature techniques, enabling the precise measurement of essential geophysical properties like elasticity and electrical conductivity of materials on Earth and other planets. By synergistically merging field geophysical observations with experimental measurements, I can reveal the complexities that underlie the dynamic processes shaping Earth and other planets.