Rock Magnetism and Paleomagnetism of Basalts Drilled during Deep Sea Drilling Project Leg 65

Pechersky, D. M.; Tikhonov, L. V.; Zolotarev, Boris P

doi:10.2973/dsdp.proc.65.139.1983

Cited by 4 publications

(3 citation statements)

References 7 publications

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“… Note : References: 1, Gee and Kent (1997); 2, Varga et al (2004); 3, Day et al (1983); 4, Pechersky, Tikhonov, and Pertsev (1983); 5, Allerton et al (2006); 6, Furuta and Levi (1983); 7, Pechersky, Tikhonov, and Zolotarev (1983); 8, Kinoshita et al (1985); 9, Facey et al (1985); 10, Smith and Banerjee (1985); 11, Smith and Banerjee (1986); 12, Pariso and Johnson (1989); 13, Pariso et al (1995); 14, Johnson (1978); 15, JANUS database for ODP Leg 206 (Wilson et al, 2003); 16, Levi (1980); 17, JANUS database for ODPI Legs 129 (Lancelot & Larson, 1990) and 185 (Plank et al, 2000); 18, Wallick and Steiner (2006); 19, Kikawa and Pariso (1991); 20, Dick et al (1999); 21, Kelemen et al (2004); 22, Gee et al (1997); 23. Cannat et al (1995); 24, Pariso et al (1996); 25, Blackman et al (2006); 26, Oufi (2002) …”

Section: Complex Oceanic Crust Structurementioning

confidence: 99%

“…However, the oceanic lithosphere includes the lava, dike, and gabbro layers as well as part of the upper mantle (Bronner et al, 2014;Liu et al, 2016), and thus, the magnetic contributions of the dike, gabbro, and serpentinised peridotite layers to the marine magnetic anomaly cannot be ignored (Pouliquen & Sailhac, 2003;Toft & Arkani-Hamed, 1992). According to the results of oceanic crust drilling and T A B L E 1 Equatorial natural remanent magnetization values for oceanic crustal rocks (Gee & Kent, 2007) (1983); 4, Pechersky, Tikhonov, and Pertsev (1983); 5, Allerton et al (2006); 6, Furuta and Levi (1983); 7, Pechersky, Tikhonov, and Zolotarev (1983); 8, Kinoshita et al (1985); 9, Facey et al (1985); 10, Smith and Banerjee (1985); 11, Smith and Banerjee (1986);12, Pariso and Johnson (1989);13, Pariso et al (1995);14, Johnson (1978); 15, JANUS database for ODP Leg 206 (Wilson et al, 2003); 16, Levi (1980); 17, JANUS database for ODPI Legs 129 (Lancelot & Larson, 1990) and 185 (Plank et al, 2000); 18, Wallick and Steiner (2006); 19, Kikawa and Pariso (1991);20, Dick et al (1999); 21, Kelemen et al (2004);22, Gee et al (1997);23. Cannat et al (1995); 24, Pariso et al (1996); 25, Blackman et al (2006);26, Oufi (2002) a Each sample value is based on three or more specimens.…”

Section: Complex Oceanic Crust Structurementioning

confidence: 99%

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Influence of the oceanic crust structure on marine magnetic anomalies: Review and forward modelling

Zhang

Jiang

et al. 2022

Geological Journal

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Handling Editor: CHANDRAKALA. KOTESWARA Marine magnetic anomaly strips are important for plate tectonic studies, thereby promoting the development of the geoscience revolution. Most previous studies typically consider a lava layer with vertical polarity boundaries as a simplified magnetic source layer. However, it cannot accurately explain the observed magnetic anomaly data; thus, complex oceanic crusts with multiple magnetic source layers, such as lava, dike, and gabbro layers, and various polarity boundary dip angles should be considered. To date, there is a lack of systematic understanding about how the dike and gabbro layers affect the total marine magnetic anomalies, particularly the effect of lava layers with different boundary inclinations on the intensity and polarity boundary of the magnetic anomaly. This study aimed to confirm the significance of these factors. Hence, we systematically simulated and analysed the magnetic anomaly characteristics with different inclination and magnetization settings for each layer using the forward modelling method and determined the impact of the complexity of the magnetic structure of the oceanic crust on the magnetic anomaly. Our results showed that the contributions of the dike and gabbro layers to the magnetic anomalies was up to 10%-30% and cannot be ignored. Moreover, the polarity transition point may shift with the inclination of the lava, dike, and gabbro layers but is insensitive to the magnetization of each layer. This study emphasizes the significance of the dike and gabbro layers and the inclination variations of different layers, which should be thoroughly studied. This study facilitates a reasonable interpretation of the magnetic structure of the oceanic crust and further refines the boundary of the magnetization zone with alternative polarity.

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Section: Complex Oceanic Crust Structurementioning

confidence: 99%

Section: Complex Oceanic Crust Structurementioning

confidence: 99%

Influence of the oceanic crust structure on marine magnetic anomalies: Review and forward modelling

Zhang

Jiang

et al. 2022

Geological Journal

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“…;Harnano et al, 1980;Nishitani and Kono, 1983;Pechersky et al, 1983;Furuta, 1983; Brown and O'Reil!y, 1987;Beske-Diehl, 1990]. The X ray diffraction pattern of one sample was measured after heating to 600øC, and it was found to have a unit cell dimension of 8.449 J•, which is only slightly larger than that of the starting titanomagnetite (a = 8.443 ]i).…”

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confidence: 99%

The effect of low‐temperature hydrothermal alteration on the remanent magnetization of synthetic titanomagnetites: A case for acquisition of chemical remanent magnetization

1991

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The effect of hydrothermal alteration on the thermoremanent magnetization (TRM) of synthetic titanomagnetite (TM40: Fe2.6Ti0.404) has been studied, to simulate the alteration that occurs in the oceanic crust. Pseudo-single-domain titanomagnetite grains, similar in size to those often found in oceanic basalts, were dispersed in a permeable but rigid glass matrix. This resulted in a TRM in the sample which was subsequently oxidized in acidic solutions while a magnetic field (0.1 mT) was applied perpendicular to the TRM direction. The experiments were conducted in a non-magnetic stainless steel pressure vessel at 150øC in solutions of acidity varying from pH=2 to pH=7. In addition to being time and temperature dependent, the acquired chemical remanent magnetization (CRM) was also found to be very pH dependent. The degree of maghemitization increased drastically as the acidity of the hydrothermal solution was increased in accordance with a process controlled by the loss of iron ions in aqueous solutions. Long-term storage experiments at carefully chosen temperatures demonstrated that no significant viscous remanent magnetization was acquired during heating. It was found that during the alteration of TM40 to titanomaghemite the CRM is along the a•nbie. nt field direction from the onset, and not partly or wholly along the TRM direction as has been found in previous air oxidation experiments. This has important implications for the possible cause of anomalous skewness of marine magnetic anomalies and for the anomalous directions of natural remanent magnetization found in some oceanic basalt samples. 19,54519,546 KELSO ET AL.: CRM IN T1TANOMAGNETITE DUE TO HYDROTttERMAL ALTERATION (i.e., the CRM direction) being perpendicular to the original TRM of the sample. They found that CRM and TRM were parallel up to z = 0.7, where z, the oxidation parameter, is the proportion of ferrous iron converted to ferric iron, which varies from 0 to 1.

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(Table 1) Magnetic properties of basalt from DSDP Leg 65 Holes

Pechersky,

Tikhonov,

Zolotarev

1983

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Rock Magnetism and Paleomagnetism of Basalts Drilled during Deep Sea Drilling Project Leg 65

Cited by 4 publications

References 7 publications

Influence of the oceanic crust structure on marine magnetic anomalies: Review and forward modelling

Influence of the oceanic crust structure on marine magnetic anomalies: Review and forward modelling

The effect of low‐temperature hydrothermal alteration on the remanent magnetization of synthetic titanomagnetites: A case for acquisition of chemical remanent magnetization

(Table 1) Magnetic properties of basalt from DSDP Leg 65 Holes

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