Long term records of erosional change from marine ferromanganese crusts

Ferromanganese crusts from the Atlantic, Indian and Pacific Oceans record the Nd and Pb isotope compositions of the water masses from which they form as hydrogenous precipitates. The10Be/9Be-calibrated time series for crusts are compared to estimates based on Co-contents, from which the equatorial Pacific crusts studied are inferred to have recorded ca. 60 Ma of Pacific deep water history. Time series of ɛNd show that the oceans have maintained a strong provinciality in Nd isotopic composition, determined by terrigenous inputs, over periods of up to 60 Ma. Superimposed on the distinct basin-specific signatures are variations in Nd and Pb isotope time series which have been particularly marked over the last 5 Ma. It is shown that changes in erosional inputs, particularly associated with Himalayan uplift and the northern hemisphere glaciation have influenced Indian and Atlantic Ocean deep water isotopic compositions respectively. There is no evidence so far for an imprint of the final closure of the Panama Isthmus on the Pb and Nd isotopic composition in either Atlantic or Pacific deep water masses

Cimotoe area

Geol. Palaont. - Inst. Univ. Kie

Cruise report POSEIDON 172-4 MIPAMEHR-MAST I Volcanism and hydrothermal activity in the strait of sicily. Malaga - Trapani - Faro: 19 Apr - 14 May 1990

With 17 figs., 2 tabs.Available from TIB Hannover: RA6759(41) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Bericht ueber Reise Nr. 158 des F.S. Poseidon T. 1, Kiel - Akureyri, 4.4.-17.4.1989: Basaltpetrographie und hydrothermale Mineralisationen am Kolbeinsey-Ruecken (noerdlich Island). T. 2, Akureyri - Kiel, 17.4.-25.4.1989: Untersuchungen zur Sedimentverteilung und -dynamik am Island-Faeroeer-Ruecken

TIB Hannover: RA 6759(38) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Cruise report SONNE 57 - Mariana back-arc, fore-arc region and Philippine basin Okinawa-Guam-Hongkong, 2.7.-11.8.1988

SIGLETIB Hannover: RA 6759(34) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Geowissenschaftliche Untersuchungen zur lokalen Verbreitung, Entstehung und Erfassung des Metallpotentials Co-reicher Erzkrusten in den submarinen Gebirgen des Zentralpazifischen Beckens (SO 33 und SO 37) T. 1. Textbd; T. 2. Anlagenbd

TIB: FR 655 (1)+(2) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman