Mean grainsize of surface samples collected from the Reef rim physiographic zone of Wistari Reef

Wistari Reef is a lagoonal platform reef, situated on the Tropic of Capricorn, within the Capricorn and Bunker region of the southern Great Barrier Reef (GBR). Surface samples were taken from the reef-rim to determine the mean grainsize and the sorting coefficient and also the proportion of aragonite to calcite within the samples. In this area the average mean grainsize is ~0.21phi, with an average sorting coefficient of 0.62phi. It should be noted that the sediments of the reef edge vary greatly in grainsize and sorting; ranging from moderately well-sorted to poorly sorted coarse sand.

威斯塔里礁（Wistari Reef）是一座泻湖型台地礁，坐落于南回归线上，隶属于南大堡礁（Great Barrier Reef, GBR）的摩羯-邦克尔海域。研究人员从该礁的礁缘采集表面样本，以测定样本的平均粒径、分选系数，以及文石（aragonite）与方解石（calcite）的占比。本区域的平均粒径约为0.21φ，平均分选系数为0.62φ。需注意的是，礁缘沉积物的粒径与分选性差异极大，粗砂组分的分选程度从中等良好至较差。