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SUMMARY:Looking Through the Sunda Arc: An Overview of Java’s Magmatism -
  Dr Esti Handini\, Universitas Gadjah Mada
DTSTART:20210218T130000Z
DTEND:20210218T140000Z
UID:TALK157267@talks.cam.ac.uk
CONTACT:Céline Marie Vidal
DESCRIPTION:The Sunda arc is a simple-looking island arc at the western ti
 p of Pacific Ring of Fire\, extending from the Andaman islands in the Nort
 h and Sumatra in the West to the small volcanic islands in the north of Sa
 vu Sea in the East. The current active arc is built on top of composite cr
 ustal blocks\, and has been active since Miocene. This more recent style o
 f activity occurred after the Cretaceous subduction period ceased\, and ar
 c activity shifted towards the north. Today\, the Sunda Arc is one of the 
 most active volcanic arcs in the world\, with 95 Quaternary volcanic cente
 rs. \nThe groundwork on Sunda arc magma geochemistry was laid in the 1970s
  (as early as 1973)\, and has now reached a new peak of data accumulation 
 and complexity. This allows us to look through a large-scale systematics o
 f arc geochemistry. Understanding this geochemical framework should provid
 e an opportunity to understand the interplay between the three main subduc
 tion zone components (i.e.\, mantle source\, subducting slab\, and the ove
 rriding crust) and their role in the generation of magmas along Sunda arc.
 \nThis talk will provide (1) an introduction to the general geochemical sy
 stematics along Sunda arc\, followed by (2) a closer look into the across-
 arc chemical systematics in Central Java. In the first part I will briefly
  show you the geochemical variation of volcanics from along the arc to sho
 w the variable association with the underlying crustal blocks. In the seco
 nd part I will highlight my recent work\, which seeks to untangle the subd
 uction contribution across Merapi-Muria volcanic line in Central Java\, wh
 ere the slab-mantle wedge interface goes deeper than the rest of the arc s
 egments\, using trace elements and radiogenic isotopes
LOCATION: Zoom webinar - link to follow
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