HR: 0800h
AN: V41C-0715    [Abstracts]
TI: Trace elemental records of short-lived heating during exhumation of the CCSD eclogites
AU: * Zong, K
EM: kqzong@126.com
AF: State Key Laboratory of Geological Processes and Mineral Resoure, China University of Geosciences, Wuhan, 430074, China
AU: Liu, Y
EM: yshliu@hotmail.com
AF: State Key Laboratory of Geological Processes and Mineral Resoure, China University of Geosciences, Wuhan, 430074, China
AB: Trace element compositions of garnet, omphacite and apatite in ultrahigh-pressure eclogites from the main hole of the Chinese Continental Scientific Drilling (CCSD) project were in situ analyzed by the LA-ICP-MS method. Although both garnet and omphacite have homogeneous major element compositions, their trace elements show zonations from core to rim in rare earth elements. In particular, middle rare earth elements in the garnet, heavy rare earth elements in the apatite and all rare earth elements in the omphacite increase from core to rim, respectively. Based on dependence of partition coefficients on temperature and pressure in these minerals, we suggest that the trace elemental zonations in these minerals may record a short-lived heating event during exhumation.
DE: 1031 Subduction zone processes (3060, 3613, 8170, 8413)
DE: 3060 Subduction zone processes (1031, 3613, 8170, 8413)
DE: 3613 Subduction zone processes (1031, 3060, 8170, 8413)
DE: 8170 Subduction zone processes (1031, 3060, 3613, 8413)
DE: 8413 Subduction zone processes (1031, 3060, 3613, 8170)
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting