Magnetic survey of the Wairakei hydrothermal field

Studt, F. E.

doi:10.1080/00288306.1959.10422768

Cited by 21 publications

(5 citation statements)

References 4 publications

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“…Studt (1959), discussing a magnetic survey of the Wairakei hydrothermal fields in New Zealand, found that the basalts were subjected to hydrothermal alteration that altered the magnetite, thus creating areas of low magnetic relief.…”

Section: If Layer 2 Is Basalt However Another Process That Would Rementioning

confidence: 98%

Geologic Implications of Aeromagnetic Data for the Eastern Continental Margin of the United States

1968

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An aeromagnetic survey extending from the Gulf of Maine to the tip of Florida was conducted by the U. S. Naval Oceanographic Office between 1964 and 1966. Flight traverses were flown in a northwesterly direction at right angles to the geologic grain. The flight lines were approximately 800 km long and had an 8-km separation. The survey traversed part of the New England, Piedmont, and Coastal Plain provinces and extended some 320 km beyond the continental shelf into the Atlantic Ocean. Despite the wide flight-line spacing, numerous geological and structural features became apparent from this survey. Interpretation of these features was aided by using the available gravity and seismic data in addition to the State and Provincial geologic maps.The residual aeromagnetic map shows a continuous magnetic high on or near the continental slope as far south as the 31st parallel. At about the 36th parallel, this east-coast magnetic anomaly splits into two branches, and both of them parallel the SSO-fathom contour. At the 31st parallel, the outer branch of the anomaly swings westward and crosses the coastline near Brunswick, Georgia. This continuous magnetic anomaly may result from an igneous intrusive body that parallels the edge of the pre-Paleozoic continental landmass. These magnetic data suggest that Florida and part of Georgia were added to the paleo-continent in pre-Paleozoic time.Landward from the east-coast anomaly, the magnetic field is quite variable, whereas oceanward it has an extremely small gradient. The absence of magnetic anomalies east of the continental slope suggests that in this region layer 2 may be composed of metamorphosed basalt.The characteristic magnetic patterns observed over the Piedmont and New England provinces extend oceanward to the east-coast anomaly.

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Section: If Layer 2 Is Basalt However Another Process That Would Rementioning

confidence: 98%

Geologic Implications of Aeromagnetic Data for the Eastern Continental Margin of the United States

1968

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“…Magnetic surveys have been found useful in the study of thermal areas in New Zealand (Studt, 1959). Some representative ground magnetometer traverses in the Steamboat area are shown on plates 3 and 4; magnetometer readings were made by a Schmidt vertical intensity magnetometer on almost all traverse points shown on plate 1.…”

Section: Magnetic Surveysmentioning

confidence: 99%

Rocks, structure, and geologic history of Steamboat Springs thermal area, Washoe County, Nevada

White¹,

Thompson²,

Sandberg³

1964

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“…Ancient analogs of hydrothermal systems in ophiolites show that discrete zones of demagnetized crust are associated with the heavily mineralized stockworks of ore deposits producing discrete magnetic anomalies [e.g., Richards et al ., ; Johnson et al ., ; Hall , ]. Furthermore, studies of hydrothermal systems on land in volcanic settings show that alteration is by far the most dominant mechanism for the destruction of magnetic minerals [e.g., Studt , ; Browne , ; Hochstein and Soengkono , ] compared to the transient thermal demagnetization of magnetic minerals due to temperatures elevated above the Curie temperature.…”

Section: Introductionmentioning

confidence: 99%

High‐resolution near‐bottom vector magnetic anomalies over Raven Hydrothermal Field, Endeavour Segment, Juan de Fuca Ridge

et al. 2014

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High-resolution, near-bottom vector magnetic data were collected by remotely operated vehicle Jason over the Raven hydrothermal vent field (47°57.3′N 129°5.75′W) located north of Main Endeavour vent field on the Endeavour segment of the Juan de Fuca Ridge. The survey was part of a comprehensive heat flow study of the Raven site using innovative thermal blanket technology to map the heat flux and crustal fluid pathways around a solitary hydrothermal vent field. Raven hydrothermal activity is presently located along the western axial valley wall, while additional inactive hydrothermal deposits are found to the NW on the upper rift valley wall. Magnetic inversion results show discrete areas of reduced magnetization associated with both active and inactive hydrothermal vent deposits that also show high conductive heat flow. Higher spatial variability in the heat flow patterns compared to the magnetization is consistent with the heat flow reflecting the currently active but ephemeral thermal environment of fluid flow, while crustal magnetization is representative of the static time-averaged effect of hydrothermal alteration. A general NW to SE trend in reduced magnetization across the Raven area correlates closely with the distribution of hydrothermal deposits and heat flux patterns and suggests that the fluid circulation system at depth is likely controlled by local crustal structure and magma chamber geometry. Magnetic gradient tensor components computed from vector magnetic data improve the resolution of the magnetic anomaly source and indicate that the hydrothermally altered zone directly beneath the Raven site is approximately 15 × 10 6 m 3 in volume.

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Magnetic survey of the Wairakei hydrothermal field

Cited by 21 publications

References 4 publications

Geologic Implications of Aeromagnetic Data for the Eastern Continental Margin of the United States

Geologic Implications of Aeromagnetic Data for the Eastern Continental Margin of the United States

Rocks, structure, and geologic history of Steamboat Springs thermal area, Washoe County, Nevada

High‐resolution near‐bottom vector magnetic anomalies over Raven Hydrothermal Field, Endeavour Segment, Juan de Fuca Ridge

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