Site U1516

Abstract

In this report the geothermal measurements made with temperature probes on the JOIDES Resolution during legs 101-180 are reanalyzed in a standard systematic manner. Sediment temperatures were measured on 53 of the first 80 Ocean Drilling Project Legs. 205 of the 475 sites have reliable data. For 22% of sites with reliable values, however, heat flow data were not reported in the Initial Results volumes. A total of 993 reliable temperature measurements yields an average of 4.8 measurements per site. Most temperature measurements were between 20 to 250 mbsf, and the deepest depth in this study is 550 mbsf. Available thermal conductivity data for these 205 sites were corrected for in-situ conditions. Heat flow values, calculated using the Bullard method, range from 5 mW m-2 to 13 W m-2. Temperature, thermal conductivity, and heat flow data presented in this report are available from the included CD.

Late Miocene‐Pliocene Vigorous Deep‐Sea Circulation in the Southeast Indian Ocean: Paleoceanographic and Tectonic Implications

“…Elements Al, Si, K, Ti, and Fe are found within sediment particles derived from terrigenous sources, while Ca is found within biogenic calcareous sediments (Calvert & Peterson, 2007; Rothwell et al., 2006). U1513 B was scanned from 0 – 72.3 m CSF‐A (Huber et al., 2019a); U1514 A from 0 – 30.1 m CSF‐A (Huber et al., 2019b); and U1516 A from 61.7 – 223.55 m CSF‐A (Huber et al., 2019c).…”

“…The Miocene‐recent interval of Sites U1513, U1514, and U1516 were drilled with the advanced piston corer (APC) coring system on the JOIDES Resolution which produced >100% recovery for all sections presented (Hobbs et al., 2019). Age models for Sites U1513, U1514, and U1516 are derived from shipboard nannofossil biostratigraphy and paleomagnetic reversals (Hobbs et al., 2019; Huber et al., 2019a, 2019b, 2019c). For Sites U1513 and U1516, geochemical trace‐metal data in the depth domain were transformed to time using the magnetostratigraphic age model, assuming linear sedimentation rates between age tie‐points.…”

“…Site U1514 is presented only in the depth domain due to the presence of major stratigraphic hiatus between 7.8 and 4.2 Ma (∼19 m CSF‐A) which reduced the resolution of the age model (Huber et al., 2019b). Natural gamma radiation (NGR) results (Hobbs et al., 2019; Huber et al., 2019c) track the decay of mineral‐hosted 238 U, 232 Th, and 40 K isotopes, which are enriched within clay minerals in hemipelagic deposits. For Exp.…”

“…[2016]; Tagliaro, Wainman, & Fulthorpe, 2021; Tagliaro, Fulthorpe, et al., 2021). Site U1513 recovered a record of upper Pliocene and Pleistocene unconsolidated deposits, Site U1514 recovered a condensed section (20 m thick) of upper Miocene to Pliocene unconsolidated deposits, while Site U1516 recovered a ∼150 m thick record of upper Miocene to Pliocene unconsolidated deposits (Figure 3; Huber et al., 2019a, 2019b; 2019c; Tagliaro, Wainman, & Fulthorpe, 2021). Here we use geochemical data, particle analysis, and age control from IODP Expedition 369 Sites to determine how deep‐ocean circulation changed in the region between Australia and Antarctica during the late Miocene and Pliocene, a period of enhanced tectonic rifting between Australia and Antarctica.…”

“… (a) Upper Miocene and Pliocene lithologies, natural gamma radiation, magnetostratigraphy, and the (b) age models for Holess U1513 B, U1514 A, and U1516 A (Hobbs et al., 2019). Linear sedimentation rates for Hole U1516 A (Huber et al., 2019c). Orange lines indicate magnetostratigraphic ties between sites.…”