Initial Report on Downhole Temperature and Shipboard Thermal Conductivity Measurements, Leg 19, Deep Sea Drilling Project

Erickson, A. J.

doi:10.2973/dsdp.proc.19.116.1973

Cited by 31 publications

(41 citation statements)

References 3 publications

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“…These values must be corrected for temperature and pressure conditions in the hole in order to be of use in the calculation of the rate of heat flow through the sediments. We accomplished this by the application of correction factors proposed by Ratcliffe (I960), and modified for use in deep-sea holes (Erickson, 1973). …”

Section: Previous Geothermal Studiesmentioning

confidence: 99%

Down-Hole Temperature Measurements, Deep Sea Drilling Project, Leg 42A

Erickson¹,

Herzen²

1978

Initial Reports of the Deep Sea Drilling Project

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Heat-flow measurements were made in DSDP boreholes at five sites in the Mediterranean and Aegean seas. AbnormalUy high heat flow was observed in the Algero-Provençal Basin, and in the Tyrrhenian and Aegean seas. Much lower heat flow was observed through the Central Ionian Sea and on the Florence Rise southwest of Cyprus. The heat-flow data from the DSDP holes are in excellent agreement with nearby conventional heat-flow values. High heat-flow through the Tyrrhenian and Aegean seas suggests, but does not require, that these basins are back-arc basins associated with the Calabrian and Cretan island arcs. The explanation of high heat flow through the Algero-Provençal and Balearic basins, and of low heat flow through the entire eastern Mediterranean Sea, may be related to thermal and chemical differences in, and horizontal and/or vertical displacements of, the asthenosphere beneath the converging African and Eurasian plates.

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Section: Previous Geothermal Studiesmentioning

confidence: 99%

Down-Hole Temperature Measurements, Deep Sea Drilling Project, Leg 42A

Erickson¹,

Herzen²

1978

Initial Reports of the Deep Sea Drilling Project

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“…For normal heat flow of about 1.5 /xcal cm~2 s -1 (Lee and Uyeda, 1965;Langseth and von Herzen, 1971), the gradient to be deduced presumably lies between 35°C/km and higher gradients of less consolidated, wetter diatomaceous sediments still underlying the sea floor. Gradients of 40°C/km have been measured in several North Sea basins that are filled with Tertiary and Quaternary clay shales (Evans and Coleman, 1974), but diatomaceous shales would probably have somewhat higher gradients because of their generally lower heat conductivity relative to clay shales (Erickson, 1973).…”

Section: Geothermal Gradients In Submarine Diatomaceous Sedimentsmentioning

confidence: 99%

“…The reflection horizon thus corresponds closely to the shaleporcelanite transition at a depth of 730 m in the Chico Martinez section. At DSDP site 185 in the Bering Sea, the product of the thermal gradient (50.4°C/km) and the average conductivity, 2.04 meal cm-1 s -1 °C -1, to 667 m, indicate a heat flow of 1.04 /teal cm-2 s -1 (Erickson, 1973). The bottom-simulating reflector at this site is at about (Elliott and others, 1968) ; the remaining thicknesses are measured values (Dlbblee, 1973).…”

Section: Geothermal Gradients In Submarine Diatomaceous Sedimentsmentioning

confidence: 99%

“…The bottom-simulating reflector at this site is at about (Elliott and others, 1968) ; the remaining thicknesses are measured values (Dlbblee, 1973). ; at and just below this depth Erickson (1973) (Creager, Scholl, and others, 1973, p. 169-185). We therefore infer that the higher conductivity of 2.82 meal cm-1 s" 1 0 C -1 is a good average value for the diagenetically altered clay that very likely corresponds to porcelanite of Chico Martinez Creek.…”

Section: Geothermal Gradients In Submarine Diatomaceous Sedimentsmentioning

confidence: 99%

“…The diatomaceous sediments of the Bering Sea (Iocs. 3 and 4, table 3) lie in a region with an average heat flow of 1.2 ^.cal cm-2 s-1 (Foster, 1962;Erickson, 1973), and they have been drilled to a subbottom depth near 700 m by the Deep Sea Drilling Project (Creager, Scholl, and others, 1973). At subbottom depths of 500-700 m in the Bering Sea, a widespread seismic reflection horizon, the so-called bottom-simulating reflector, is coincident with an abrupt downward change in lithology from diatomaceous ooze to a harder cristo- Hills, 1954;Maricopa, 1951. balitic clay and clay stone .…”

Section: Geothermal Gradients In Submarine Diatomaceous Sedimentsmentioning

confidence: 99%

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Journal of Research of the U. S. Geological Survey, 1975, volume 3, issue 5

1975

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Origin of Authigenic Carbonates in Sediment from the Deep Bering Sea

Hein¹,

O'Neill²,

Jones³

2003

Sandstone Diagenesis

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Forty beds of authigenic carbonate were identified from the deep Bering Sea in cores taken on Leg 19 of the Deep Sea Drilling Project. Carbonate minerals were mainly high-magnesium calcite and protodolomite, less commonly siderite, rhodochrosite, low-magnesium calcite, and manganosiderite. Authigenic carbonates cement and replace diatom ooze, ash and bentonite beds, and, less commonly, clastic beds. Replacement zones are as much as 60 cm thick. Eighty-five per cent of carbonate beds occurred below 400 m sub-bottom depth and 70% in sediment older than 4 m.y. 613C values averaged--l7~20"/,, PDB and 6l80 ranged from 18.59 to 34.1 lo/oo SMOW. The carbon was derived from oxidation of organic matter under anaerobic conditions during bacterial reduction of sulphate, or from CO, produced in concert with CH, during degradation of organic matter. The cations (Ca, Mg, Fe, Mn) were derived from alteration of ash beds. In Bering Sea deposits, ash beds altered to smectite within about 3-5 m.y. Carbonate precipitated simultaneously at different stratigraphic levels within the 627-1057 m sections at temperatures of 7-85°C. No apparent calcite precursor of biogenic origin was found for these authigenic carbonates.

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Initial Report on Downhole Temperature and Shipboard Thermal Conductivity Measurements, Leg 19, Deep Sea Drilling Project

Cited by 31 publications

References 3 publications

Down-Hole Temperature Measurements, Deep Sea Drilling Project, Leg 42A

Down-Hole Temperature Measurements, Deep Sea Drilling Project, Leg 42A

Journal of Research of the U. S. Geological Survey, 1975, volume 3, issue 5

Origin of Authigenic Carbonates in Sediment from the Deep Bering Sea

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