科研之友
微信
新浪微博
Facebook
分享链接
摘要
Basic rocks in the CCSD main borehole, which is located in the ultrahigh pressure metamorphic terrain of the Sulu area, China, can contain apatites showing exsolution textures. These apatites, which are the major accessory minerals in some samples, coexist with garnet, omphacite, phengite, and rutile in eclogites and with omphacite, epidote, and rutile in amphibole-rich rocks. Almost all apatite grains in these samples show exsolved rods strictly orientated in one direction. No pyrrhotite rods but aqueous inclusions were observed in the late-stage apatite grains. All exsolved rods have similar width (< 1 mu m) but variable length (5 similar to 100 mu m). The energy-dispersive (EDS) analyses show that the rods mainly consist of S and Fe. In fact, the Fe: S ratios could not be accurately measured but they are similar to that of pyrrhotite (Fe1-xS). Apatite contains considerable contents of F, Cl, and minor amounts of S showing by pyrrhotite exsolution. Thus, such apatites demonstrate that recycling of corresponding rocks in the deep Earth must also consider F and Cl which might, however, be mainly bounded to micas.
- 出版日期2007-12
- 单位北京大学
