ÿþ<HTML xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns="http://www.w3.org/TR/REC-html40"> <HEAD> <meta name=Title content="The Sangihe volcanic arc"> <meta name=Keywords content=""> <meta http-equiv=Content-Type content="text/html; charset=macintosh"> <meta name=ProgId content=Word.Document> <meta name=Generator content="Microsoft Word 10"> <meta name=Originator content="Microsoft Word 10"> <link rel=File-List href="sangihe_files/filelist.xml"> <link rel=Edit-Time-Data href="sangihe_files/editdata.mso"> <TITLE>Sangihe research</TITLE> <LINK REL="stylesheet" TYPE="text/css" HREF="stylesheet.css"> </HEAD> <BODY BACKGROUND="smoke1.jpg" BGCOLOR="silver" LANG="EN-US" LEFTMARGIN="60"> <BR> <H1>The Sangihe volcanic arc</H1> <BR> <HR WIDTH="60%"> <BR> <P>This is a very unusual tectonic setting where the tiny Molucca Sea Plate subducts beneath the Sangihe Arc on its western margin, and also beneath the Halmahera arc only 250 km away on its eastern margin. We looked at what effect this double-subduction might be having on the chemistry of the gases. This is also an ideal place to study along-arc variations of volatiles.</P> <BR><BR> <IMG SRC="sangihemap.gif" WIDTH="431"> <BR>Tectonic map of the Molucca Sea area. From Clor et al., 2005. <BR><BR><BR> <IMG SRC="sangihexsection.gif" WIDTH="400" BORDER="1"> <BR>Schematic cross section through the Molucca Sea, showing subduction in two directions. From Clor et al., 2005. <BR><BR> <H3>Publications from this work:</H3> <P CLASS="reference">Clor, L.E.*, <B>Fischer, T.P.</B>, Hilton, D.R., Sharp, Z.D., and Hartono, U. (2005), Volatile and N isotope chemistry of the Molucca Sea collision zone: Tracing source components along the Sangihe Arc, Indonesia, <I>Geochem. Geophys. Geosyst.</I>, 6, Q03J14, <A HREF="http://www.agu.org/journals/gc/gc0503/2004GC000825/">doi:10.1029/2004GC000825</A>.</P> <P CLASS="reference">Jaffe, L.A., Hilton, D.R., <B>Fischer, T.P.</B>, and Hartono, U. (2004), Tracing magma sources in an arc-arc collision zone: Helium and carbon isotope and relative abundance systematics of the Sangihe Arc, Indonesia, <I>Geochem. Geophys. Geosyst.</I>, 5, Q04J10, <A HREF="http://www.agu.org/journals/gc/gc0404/2003GC000660/">doi:10.1029/2003GC000660</A>.</P> <BR> <P CLASS="note">* Fischer's student</P> </BODY> </HTML>