082609_ASU-SESE_Tim Grove (MIT)

Date: 26 Aug, 2009
Speaker: Tim Grove (Massachusetts Institute of Technology)
Title: Melt Generation Processes in Subduction Zone
Abstract: New experimental results and evidence from field investigations of subduction zone volcanoes provide insight into the processes that lead to the volcanoes at convergent margins. The experimental evidence on the pressure and temperature of mantle peridotite melting in the presence of H2O illuminates new processed that transport H2O to depth in subducted zones and new insights into the beginning of melting in the mantle wedge above the subducted slab. When combined with geochemical evidence from arc lavas a model of hydrous flux melting can be constructed that allows one to understand the unusually high H2O contents observed in arc magma (4 to 6 wt. % H2O). These experimental and geochemical constraints also allow one to understand the physical factors control the location of volcanoes in subduction zones.

Note: H2O and Chlorite play critical rules in the Subduction Zone down to 150 km from surface. The thing impressed me the most is "what do you think how deep the slabs go down in subduction zones to create volcanoes?" The range is 60-130 km and the average is 108 km.

Have one more book in my list??

也不真是書，倒是本身的技能很弱。算是有些心急，想當初在東華也花了一年多才確定想要做得題目。現在只能不斷地看paper，卻對應用軟體跟具體的研究項目感到非常不踏實。停留在教一動做一動的階段，五年的時間夠嗎？^^:

Last day in USC

沒想到硬是忙到最後一刻，過去幾天真是充實！雖然只完成了初步成果，但確定有些方向可以走，還不賴！

第一個星期努力念C-shell，卻越念越想睡覺，超級沒效率，我果然不是K書的料。第二個星期開始做些工作，剛覺得有材料可以練習，卻發現熟悉度有限，進度超慢，導致心情有些低落，直到最後兩天才發現有很多預備工作要弄，除了跟小吾一家偷閒了一天，竟然每天都在唸書跟工作。第三個星期就精彩啦！一直遭遇困難，一解決了就馬上沒天沒地的把資料分析完，今天就真的做到最後一刻，還是有些課題沒解決到，帶著四張A1的走時圖就這麼飛到Denver，現在腦袋有點不清楚，但精神上有收穫，心情很愉快。