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.

企業唯才是用

有時在想，逢迎拍馬是否為職場必備的能力之一。當然在一般年輕人心裡，”理”應當是最行得通的準則之一。大多數人都會期待老闆懂得賞識人才，那如果事實並非如此呢？又該怎樣說服自己進了一家有願景的公司？甚或擁有讓人生充滿願景的未來？
這個問題我還沒有參透，要依從自己的意願或是保全大環境。

戰爭

聽著 There You’ll Be 珍珠港的主題曲，細想電影裡的情節。戰爭是人類罪行中最殘忍的，上位者操弄愛家愛國虛偽的意識形態，迫使千千萬萬人家的父母兄弟姐妹前往戰場與一樣無辜的對手在戰場上廝殺。海珊在前些時候伏法了，看他所受的折磨跟死法，跟眾多賠上身家性命的無辜受害者相比，他受到的待遇何其高尚與尊嚴。如果有上帝，海珊離開軀體後會前往哪裡？想起李家同在陌生人裡的一篇文章，貪得無厭的人到了天堂卻想早點下地獄。
仇恨是這些罪惡行為的起源，如果都沒有了仇恨，我們將會生活在一個很快樂的世界裡。為何佛教會說人來到這世間是來受苦的，要贖前世的債。其實你我都有能力讓這個世界更美好。修身齊家治國平天下，越覺中國五千年文化真是寶典。