Christie, David M.; Pedersen, Rolf B.; Miller, D. Jay; Balzer, Vaughn G.; Einaudi, Florence; Gee, M. A. Mary; Hauff, Folkmar; Kempton, Pamela D.; Liang, Wen-Tzong; Lysnes, Kristine; Meyzen, Christine M.; Pyle, Douglas G.; Russo, Christopher J.; Sato, Hiroshi; Thorseth, Ingunn H. (2001): Site 1161. Texas A&M University, Ocean Drilling Program, College Station, TX, United States, In: Christie, David M., Pedersen, Rolf B., Miller, D. Jay, Balzer, Vaughn G., Einaudi, Florence, Gee, M. A. Mary, Hauff, Folkmar, Kempton, Pamela D., Liang, Wen-Tzong, Lysnes, Kristine, Meyzen, Christine M., Pyle, Douglas G., Russo, Christopher J., Sato, Hiroshi, Thorseth, Ingunn H., Bridges, Brenda (editor), Proceedings of the Ocean Drilling Program, initial reports, mantle reservoirs and migration associated with Australian Antarctic rifting; covering Leg 187 of the cruises of the drilling vessel JOIDES Resolution; Fremantle, Australia, to Fremantle, Australia; sites 1152-1164, 16 November 1999-10 January 2000, 187, georefid:2003-045874

This site was intended to check for Indian-type mantle between Sites 1158 and 1159. If it is of Indian type, it could test whether rift propogation reintroduced Pacific-type mantle beneath the region. Hole 1161A produced 4.4 m (15% recovery) of basaltic rubble with fragments of plagioclase-olivine phyric basalt breccia. Between the larger clasts is a finer-grained breccia with clasts of altered basalt and palagonitized glass in a clay-rich sediment matrix. This hole was abandoned due to drilling problems Hole 1161 B is composed of aphyric to highly plagioclase olivine phyric basalt and basaltic breccia. Both holes were moderately to highly altered by low-temperature reactions. Za/Br systematics of 1161A basaltic glass indicate Indian-type mantle source. The glass has a high Na (sub 2) O/TiO (sub 2) relative to other Leg 187 compositions and is therefore Indian type. This occurrence, separated by <1 Ma from the Pacific type mantle beneath site 1158, documents a second incursion of Indian-type mantle into Zone A (1157 is the first).(LEL)
West: 129.0306 East: 129.0306 North: -44.1706 South: -44.1712
Expedition: 187
Site: 187-1161
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