Because the central theme of Leg 184 was the Neogene coevolution of tectonics and climate, the shipboard focus was on recovering continuous sediment sections capable of recording millennial- to orbital-scale variations. This concentration on orbital-scale and higher resolution variability is reflected in the Leg 184 shipboard measurements program as well as its sampling plan and shore-based analysis.

Shipboard measurement strategy was to acquire high-resolution (2-5 cm) core-logging records from all holes, including MS, gamma-ray attenuation (GRA) bulk density, NGR, and CR These data were used to construct the meters composite depth (mcd) scale, which was used to evaluate the completeness of the stratigraphic section and to splice an intact, representative record for each site. Routine measurements, taken at frequencies of one per section to one per core (intervals of ~1.5-10 m), included biostratigraphy (calcareous nannofossils and foraminifers), paleomagnetism, hydrocarbon gas analysis, interstitial water chemistry, moisture and density, carbonate, and P-wave velocities.

The Leg 184 downhole logging plan was designed to provide (1) complete stratigraphic coverage, especially in the incomplete XCB intervals; (2) proxy data not available from core measurements, such as resistivity and yields of K, U, and Th; and (3) in situ sonic velocity for the construction of synthetic seismograms. Sites 1143, 1144, 1146, and 1148 were logged using the following three downhole tool strings:

Site Summaries - Site 1143

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