supported by the Chinese Academy of Sciences (Grant no.KZCX3-SW-234);the National Natural Science Foundation of China (Grant no.40476025);the Science and Technology Program of Guangdong Province (Grant no.2004B33201002).
The coastal hard rock with a thickness of over 5 m and a distribution area of nearly 200 ha in the Haishan Island, south China, has long drawn researchers' attention. However, there were controversies over its format...