ELECTRONIC APPENDIX 16
Further aspects for ZIP studies
Gaps remain in the overall picture of West Pacific margin ZIP genesis, where some regions and aspects of
zircon growth need more comprehensive detailed study. This particularly applies to Thailand and Cambodia
sites, where sapphire/ruby studies prevail, but where detailed accompanying zircon U –Pb and FT ages, zircon
trace element, O and Hf isotope data are often lacking. Studies of zircon megacrysts from the Ratanakiri,
Cambodian gem deposits, particularly favourable for heat treatments, are in progress (Piilonen et al. 2014) and
will add new data for integration into the regional ZIP models. Further combined studies of mineral, fluid and
melt inclusions in zircon and sapphire, such as at Dak Nong, Vietnam (Izokh et al. 2010) are needed. Noble gas
isotopic studies on zircon suites, such as made on Changle sapphire, East China (He et al. 2011) may reveal new
aspects on mantle/ crust relationships within ZIP suites. More detailed integrated studies will provide better
resolution of the complex source interaction involved in generating ZIP melts.
Potential targets for further finds and extensions of ZIP sites remain in remote settings, such as the large
active Changabai volcano that borders North Korea, China and Russia (Lei and Zhao 2005), late Cenozoic
megacryst-bearing alkali basalt exposures along the ice-clad Antarctic, SW Pacific rift margins (Cooper et al.
2007) and unusual West Pacific settings and source magmas such as described for Mailata zircons generated
below oceanic plateau crust in alnoite source magmas (Simonetti and Neal 2010).
References
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a basanite volcano, White Island, Ross Sea, Antarctica. J Volcanol Geotherm Res 165: 189–216
He H, Zhu R, Saxton J (2011) Noble gas isotopes in corundum and peridotite xenoliths from Eastern North
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Izokh AE, Smirnov SV, Egorova VV, Tran Tuan Anh, Kovyazin SV, Ngo Thi Phuong, Kalinina VV (2010) The
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