Age dating and isotopic analyses of sediment core RC11-120

Using the concept of 'orbital tuning', a continuous, high-resolution deep-sea chronostratigraphy has been developed spanning the last 300,000 yr. The chronology is developed using a stacked oxygen-isotope stratigraphy and four different orbital tuning approaches, each of which is based upon a different assumption concerning the response of the orbital signal recorded in the data. Each approach yields a separate chronology. The error measured by the standard deviation about the average of these four results (which represents the 'best' chronology) has an average magnitude of only 2500 yr. This small value indicates that the chronology produced is insensitive to the specific orbital tuning technique used. Excellent convergence between chronologies developed using each of five different paleoclimatological indicators (from a single core) is also obtained. The resultant chronology is also insensitive to the specific indicator used. The error associated with each tuning approach is estimated independently and propagated through to the average result. The resulting error estimate is independent of that associated with the degree of convergence and has an average magnitude of 3500 yr, in excellent agreement with the 2500-yr estimate. Transfer of the final chronology to the stacked record leads to an estimated error of +/-1500 yr. Thus the final chronology has an average error of +/-5000 yr.

Chemical composition of basalts from ODP Leg 115

Leg 115 of the Ocean Drilling Program recovered basalts from four locations along the hotspot track that leads from the Deccan flood basalts in India to Reunion Island in the western Indian Ocean (Sites 706, 707, 713, and 715). The drilled basalts range in age from 35 Ma (Site 706) to 64 Ma (Site 707), and including the Deccan basalts (66 to 68 Ma), Mauritius Island (0.2 to 8 Ma), and Reunion Island (0 to 2 Ma), seven sites are provided for sampling the volcanic record of the 5000-km-long hotspot track. Chemical and age comparisons indicate that Site 707 lavas correlate with basalt units near the top of the Deccan flood basalt sequence. The lavas of Site 715 (55 to 60 Ma) are most similar to the islands of Mauritius and Reunion. Site 713 basalts (48 Ma) are similar to the earliest lavas of the Deccan province, and Site 706 basalts are intermediate in chemistry between those of central Indian spreading-ridge basalts and Reunion. Differences in lava compositions along the hotspot track can be related to variable mixing of plume and asthenospheric mantle, depending on the changing position of spreading-ridge segments and the hotspot during the opening of the Indian Ocean. Alternatively, time-dependent changes in the composition of hotspot melts may be due to a decrease in partial melting of a heterogeneous plume or to intrinsic changes in the composition of material supplied by the plume.

1983 University of Michigan Football Team

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Back Row: Bill Giarmo, Alex Agase, Jerry Hanlon, Bob Thornbladh, Elliott Uzelac, Gary Moeller, Lloyd Carr, Jerry Meter, Milan Vooletich, Tirrel Burton, Bob Chmiel, Jim Herrmann, Dave Magazu

9th Row: Doug Ham (Mgr.), Mike Gittleson, Lou Kovacs, Joe English, Joe Mosketti, James Rott, Garrett Smith, Phil Logas, John Whitledge, Andy Samosiuk, Dave Garlow, Russ Miller, Fritz Seyferth, Jon Falk

8th Row: Tim Schulte, Mike O'Connor, Billy Harris, Carlitos Bostic, Gene Cecchini, Steve Thibert, Jack Walker, John Balourdos, Pete Wentworth, Todd Schulte, Brandon Johns, Monte Robbins, John Zingales

7th Row: Billy Dawson, Doug Mallory, Gerald White, Garland Rivers, Dave Folkertsma, Andrew Borowski, Glenn Mogle, John Elliott, Andree McIntyre, Dwayne Freeman, Phil Webb, Chris Zurbrugg, Ken Higgins, Russell Rein

6th Row: Gene Lawson, Camp Fellin, Marc Shevrin, Dieter Heren, John Mihic, Jerry Quaerna, Rick Frazer, Marty Shimko, Triando Markray, Dan Decker, Keith Cowan, Pat Moons, Ed Hood, Al Bishop

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3rd Row: Joe Gray, Mike Mallory, Clay Miller, Eric Kattus, Art Balourdos, Al Sincich, Kevin Brooks, Mike Hammerstein, Sim Nelson, Jeff Akers, Rick Rogers, Bob Popowski, Bob Tabachino, Brian Mercer

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Front Row: Jeff Cohen, Jerry Diorio, Dave Hall, Carlton Rose, Steve Smith, Tom Dixon, Stefan Humphries, Mike Boren, Doug James, Evan Cooper, Tom Hassel, John Lott, Vince Bean, Rich Hewlett, Coach Bo Schembechler