Siderite transforms to magnetite/hematite during/after the large earthquake along the East Yibug Chaka Fault in the Qiangtang Terrane, Central Tibetan Plateau
Abstract
A series of large earthquakes occurred during the past decade, and more and more geologist focus on seismogeology research. Fault rocks, from the scientific drilling project's holes and outcrops, are the main materials for deciphering the seismogeology issues. In this study, a well exposed fault rocks outcrop is detected along the East Yibug Chaka Fault (EYF) earthquake rupture zone in the Qiangtang terrane (QT), Central Tibetan Plateau (TP). The fault rocks include the fault gouge and fault breccia of the footwall and hanging wall. Rocks magnetism and X-ray diffraction measurement results give the magnetic mineral assemblages of the fault rocks. Basing on the difference of the magnetic minerals, the new-formed magnetite/hematite in the gouge from siderite is possible the magnetic mineral change during/after large earthquake along the East Yibug Chaka Fault. The new-formed hematite maybe induced by the earth surface process after large earthquake.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2017
- Bibcode:
- 2017AGUFMGP51A0773L
- Keywords:
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- 1518 Magnetic fabrics and anisotropy;
- GEOMAGNETISM AND PALEOMAGNETISM;
- 1519 Magnetic mineralogy and petrology;
- GEOMAGNETISM AND PALEOMAGNETISM;
- 1525 Paleomagnetism applied to tectonics: regional;
- global;
- GEOMAGNETISM AND PALEOMAGNETISM;
- 1527 Paleomagnetism applied to geologic processes;
- GEOMAGNETISM AND PALEOMAGNETISM