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The pre-pilot drillhole CCSD-PP1 of the Chinese Continental Scientific Drilling Project, with a depth of 432.08 m, is located in the Donghai area in the southeaste Sulu terrane. The core samples are comprised mainly of paragneiss, granitic gneiss and ultramafic rock with minor intercalated layers of phengite-bearing kyanite quartzite and eclogite.