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Annotated record of the detailed examination of Mn deposits from DSDP Site 49, Leg 6 (Cores 49A-1, 49-1) (1971)

Heezen, Bruce C ; Fischer, A G ; Boyce, Robert E ; [et al.]

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In: Supplement to: Heezen, Bruce C; Fischer, A G; Boyce, Robert E; Bukry, David; Douglas, Robert G; Garrison, Robert E; Kling, S A; Krasheninnikov, Valery A; Lisitzin, Alexander P; Pimm, Anthony C (1971): Site 49. In: Fischer, A.G.; et al., Initial Reports of the Deep Sea Drilling Project, 6, Initial Reports of the Deep Sea Drilling Project, 6, U.S. Government Printing Office, VI, 171-194, https://doi.org/10.2973/dsdp.proc.6.107.1971

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Publication Date: 2023-08-28

Description: At Sites 47 and 48, impenetrable and cherty Upper Cretaceous chalks were found. The upper part of what infer to be lower Cretaceous is even more reflective, and likely to be very cherty (and was found to be cherty in the Vema core). It became clear that basement could only be reached where the Upper Cretaceous and the upper part of the lower Cretaceous are absent. However, west of Site 48, the R/V Argo record showed an area in which the Upper Cretaceous has wedged out down dip, and the Lower Cretaceous is thinning out by loss of the strongly reflective beds at the top. This area appeared to offer the best chance for sampling the lowermost transparent layer. Two holes were drilled: Hole 49.0 and Hole 49.1 after Hole 49.0 stopped at 18 m. Beds near the base of sedimentary sequence revealed by the seismic profiles are found to be of early Cretaceous (Neocomian) or latest Jurassic (Tithonian) age, and of pelagic facies. The crust under the Shatsky Rise is latest Jurassic or older.

Keywords: 6-49; 6-49A; Comment; Deep Sea Drilling Project; Deposit type; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; Event label; Glomar Challenger; Identification; Leg6; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; North Pacific/CONT RISE; Position; Quantity of deposit; Sample code/label; Sediment type; Size; Substrate type; Visual description

Type: Dataset

Format: text/tab-separated-values, 63 data points

	Location	Call Number	Expected	Availability

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