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| Abstract |
Heavy mineral composition of the bottom sediments of the northeastern part of the East China Sea has been analyzed. The result shows that some diagnostic mineral suites can be used for establishing th...ree petroprovinces: Goto, Tsushima Strait, and Cheju. The Cheju Petroprovince is the northernmost part of the newly proposed Staurolite Petroprovince on a large scale, which characterizes the main shelf region of the East China Sea. The Goto Petroprovince is represented by a mineral suite of clinopyroxene and hypersthene, that characterizes the coastal seas of the Goto Islands and mainland Kyushu. The Tsushima Strait Petroprovince is composed mainly of green and brown hornblende and clinopyroxene, which prevail in the area of the Tsushima Strait. The Cheju Petroprovince is characterized by a suite of staurolite, well-rounded zircon, rutile, tourmaline, and garnet, which are widely scattered in the shelf region south of latitude 33°. Staurolite as an index mineral of high-grade metamorphic rocks is also found in many Neogene sediments in northwestern Kyushu, Okinawa, Miyako Island, Yaeyama Island, and North Taiwan. These occurrences of staurolite suggest the establishment of the Neogene Staurolite Petroprovince, on which the Present Staurolite Petroprovince overprints. Such an occurrence of staurolite seems to be important for reconstructing tectonics and paleogeography of the East China Sea area.show more
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