Site U1492: Expedition 366

Abstract

Site U1492 is located on the southwestern rim of the summit of Yinazao Seamount (informally known as Blue Moon Seamount) along the extension of an inferred northeast-trending normal fault where there was evidence for interstitial water discharge. Three boreholes were cored to recover materials from the area of the hypothesized conduit. Holes U1492A, U1492B, and U1492C are located 200 m north, 100 m north, and 25 m south, respectively, of Hole U1492D, the site identified to have the highest interstitial water discharge rate in precruise surveys. Screened casing was emplaced in Hole U1492D, and the hole was revisited late in the expedition to seal the base of the casing, leaving a cased/screened borehole ready for a future CORK- Lite deployment.