R7: Petrology, Mineralogy and Economic geology (Joint Session with Society of Resource Geology)

[R7-11] The magmatic conditions and hypersolidus deformation of lower crustal magma chamber below a fast-spreading ridge. Insight from the core analyses of the Oman ICDP drill holes GT1A and GT2A

*Trinh Nguyen¹, Susumu Umino¹, Takahiro Fudai³, Yuki Kusano², Osamu Ishizuka², Akihiro Tamura¹, Tomoaki Morishita¹ (1. Kanazawa University, 2. AIST, 3. Pacific Cement, Co. Ltd.)

Keywords:Oman ICDP, GT1A>2A, magma chamber, fast-spreading ridge, foliated gabbro

The ICDP Oman Drilling Project drilled the lower crustal section of the Oman Ophiolite in Wadi Gideah, north of Ibra and recovered 400 m long cores each from Hole GT1A and GT2A. Microscope observations and La-ICP-MS analyses were conducted on the core samples to obtain microstructural data and trace element concentrations, which help to understand the magmatic conditions and hypersolidus deformation operated in the lower crustal magma chamber beneath the Oman paleoridge axis.