Previous   |    Next

doi:10.2204/iodp.proc.324.204.2013

Data report: Si, Al, Fe, Ca, and K systematics of volcaniclastic sediments from selected cores of Hole U1347A, IODP Expedition 324¹

Sandra Herrmann² and Nicole A. Stroncik²

Abstract

We analyzed the whole-rock Si, Al, Fe, Ca, K, Cl, and Mn content of volcaniclastic sediment cores recovered during Integrated Ocean Drilling Program Expedition 324 in Hole U1347A. Hole U1347A, located at the eastern flank of Tamu Massif, the oldest of the three volcanic edifices forming Shatsky Rise, a large igneous plateau in the western Pacific, was drilled into early Cretaceous sediments and volcanic basement. The analyzed cores represent the mainly volcaniclastic sediments lying on top of the basaltic basement, which starts at roughly 156.7 meters below seafloor. Whole-rock Si, Al, Fe, Ca, K, Cl, and Mn were obtained from a stratigraphic depth interval covering about 60 m using an Avaatech X-ray fluorescence core scanner. Data interpretation has been based on the normalization of individual element count rates to Ca. In the uppermost 110 m depth interval, increases in the Al/Ca, Fe/Ca, Mn/Ca, K/Ca, and Cl/Ca ratios can be observed. Below this depth, no clear element depth correlation is evident and the average element ratios stay relatively constant throughout the remaining depth interval. However, rhythmic patterns can be observed throughout the entire investigated core material, characterized by positive co-variations of Si/Ca, Al/Ca, Fe/Ca, Mn/Ca, K/Ca, and Cl/Ca with variable amplitudes and peak widths. The geochemical downhole trends of increasing Si/Ca, Al/Ca, Fe/Ca, Mn/Ca, K/Ca, and Cl/Ca clearly reflect the changes in the principal lithology from marine limestone with intercalated chert to volcaniclastic sediment. The observed rhythmic patterns of Si/Ca, Al/Ca, Fe/Ca, Mn/Ca, K/Ca, and Cl/Ca correlate with existing variations in the ratio of volcaniclastic material to carbonaceous material.

¹ Herrmann, S., and Stroncik, N.A., 2013. Data report: Si, Al, Fe, Ca, and K systematics of volcaniclastic sediments from selected cores of Hole U1347A, IODP Expedition 324. In Sager, W.W., Sano, T., Geldmacher, J., and the Expedition 324 Scientists, Proc. IODP, 324: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.324.204.2013

² Integrated Ocean Drilling Program, Texas A&M University, 1000 Discovery Drive, College Station TX 77845, USA. Correspondence author: herrmann@iodp.tamu.edu

Initial receipt: 17 November 2012
Acceptance: 21 May 2013
Publication: 14 October 2013
MS 324-204

Top of page   |    Previous   |    Next