A Least-Squares Method to find a Remanence Direction from Converging Remagnetization Circles

Halls, H. C.

doi:10.1111/j.1365-246x.1976.tb00327.x

Cited by 250 publications

(126 citation statements)

References 8 publications

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“…However, a ChRM direction (Fig. 4c) could be calculated using the converging remagnetization circles technique of Halls (1976) and McFadden and McElhinny (1988).…”

Section: Palaeomagnetic Resultsmentioning

confidence: 99%

Southward migration of continental volcanic activity in the Sierra de Las Cruces, Mexico: palaeomagnetic and radiometric evidence

et al. 2000

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New Palaeomagnetic data for 30 sites (271 samples) and K-Ar data from five units in the Sierra de Las Cruces, western Basin of Mexico, provide constraints on the spatial-temporal evolution of arc magmatism in the central Trans-Mexican Volcanic Belt. The normal and reversed directions show a polarity pattern with a consistent spatial zonation perpendicular to the NNW-SSE trend of the range. The magnetostratigraphy and K-Ar dates indicate that volcanic activity in the Sierra de Las Cruces migrated southeastward at a mean rate of 1.6 cm/a, between 3.6 and 1.8 Ma, and that the rate of migration may have been higher, up to 4 cm/a, during the Gauss Chron. Normal and reversed directions pass the reversal test at a 95% confidence level. The mean Plio-Quaternary palaeomagnetic direction for Sierra de Las Cruces is D=350.7\ I=30.6° (N=25, k=30.7, :;(95=5.3°). The declination deviates to the west of the expected direction, which suggests that small counterclockwise rotations could take place during formation of the Sierra de Las Cruces volcanics.

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“…However, a ChRM direction (Fig. 4c) could be calculated using the converging remagnetization circles technique of Halls (1976) and McFadden and McElhinny (1988).…”

Section: Palaeomagnetic Resultsmentioning

confidence: 99%

Southward migration of continental volcanic activity in the Sierra de Las Cruces, Mexico: palaeomagnetic and radiometric evidence

et al. 2000

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“…ChRM of type C specimens were analyzed using Fisherian statistics [30]. A less reliable type showed two overlapping magnetic components thus showing demagnetization trajectories that do not go to the origin (type D); it was analyzed using statistical methods of remagnetization circles [31,32]. Finally, specimens with the least reliable paleomagnetic behavior were discarded (type E).…”

Section: Demagnetization Techniques and Paleomagnetic Resultsmentioning

confidence: 99%

The Neuquén composite section: magnetostratigraphy and biostratigraphy of the marine lower Jurassic from the Neuquén basin (Argentina)

Llanos

Riccardi

2000

Earth and Planetary Science Letters

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Paleomagnetic and biostratigraphic data from five marine sedimentary sections in the Argentine Neuquën basin have allowed to construct the Lower Jurassic Neuquën Composite Section. This composite section comprises 14 reversed and 11 normal polarity Zones, in relation to 17 Andean ammonite Assemblage Zones, spanning the Hettangian^Toarcian (Early Jurassic). It represents the first paleomagnetic data of Lower Jurassic marine successions in the Southern Hemisphere. The Neuquën composite Section was correlated to the International Mesozoic Polarity Time Scale which, for the Lower Jurassic, comprises 54 polarity Zones and 16 Standard ammonite Zones. The correlation between the regional and the international biomagnetostratigraphic scales supports but also refines the correlation between the Andean and Standard ammonite zonations. Correlation between the Neuquën composite Section and the polarity sequences recorded in each section helped to assign several unfossiliferous stratigraphical levels to the corresponding biozones. ß

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“…McGuire ( 1989) based his original interpretation of the demagnetisation data on the premise that the primary, detrital component of magnetisation was the highest blocking temperature component. He made significant use of great circles analysis (Halls 1976(Halls , 1978McFadden & McElhinny 1988) to interpret data that had not reached a stable endpoint before thermal alteration occurred. The overall result of his analysis was a rather noisy, mixed polarity record that was difficult to correlate with the geomagnetic polarity timescale.…”

Section: Geological Settingmentioning

confidence: 99%

A coherent middle Pliocene magnetostratigraphy, Wanganui Basin, New Zealand

Turner

Kamp²,

McIntyre

et al. 2005

Journal of the Royal Society of New Zealand

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We document magnetostratigraphies for three river sections (Turakina, Rangitikei, Wanganui) in Wanganui Basin and interpret them as corresponding to the Upper Gilbert, the Gauss and lower Matuyama Chrons of the Geomagnetic Polarity Timescale, in agreement with foraminiferal biostratigraphic datums. The Gauss-Gilbert transition (3.58 Ma) is located in both the Turakina and Wanganui River sections, while the GaussMatuyama transition (2.58 Ma) is located in all three sections, as are the lower and upper boundaries of the Mammoth (3.33-3.22 Ma) and Kaena (3.11-3.04 Ma) Subchrons. Our interpretations are based in part on the re-analysis of existing datasets and in part on the acquisition and analysis of new data, particularly for the Wanganui River section. The palaeomagnetic dates of these six horizons provide the only numerical age control for a thick (up to 2000 m) mudstone succession (Tangahoe Mudstone) that accumulated chiefly in upper bathyal and outer neritic palaeoenvironments. In the Wanganui River section the mean sediment accumulation rate is estimated to have been about 1.8 m/k.y., in the Turakina section it was about 1.5 m/k.y., and in the Rangitikei section, the mean rate from the beginning of the Mammoth Subchron to the Hautawa Shellbed was about 1.1 m/k.y. The high rates may be associated with the progradation of slope clinoforms northward through the basin. This new palaeomagnetic timescale allows revised correlations to be made between cyclothems in the Rangitikei River section and the global Oxygen Isotope Stages (OIS) as represented in Ocean Drilling Program (ODP) Site 846. The 16 depositional sequences between the end of the Mammoth Subchron and the Gauss-Matuyama Boundary are correlated with OIS MG2 to 100. The cyclothems average 39 k.y. in duration in our age model, which is close to the 41 k.y. duration of the orbital obliquity cycles. We support the arguments advanced recently in defence of the need for local New Zealand stages as a means of classifying New Zealand sedimentary successions, and strongly oppose the proposal to move stage boundaries to selected geomagnetic polarity transitions. The primary magnetisation of New Zealand mudstone Zealand, Volume 35, 2005 is frequently overprinted with secondary components of diagenetic origin, and hence it is often difficult to obtain reliable magnetostratigraphic records. We suggest specific approaches, analytical methods, and criteria to help ensure robustness and coherency in the palaeomagnetic identification of chron boundaries in typical New Zealand Cenozoic mudstone successions.

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A Least-Squares Method to find a Remanence Direction from Converging Remagnetization Circles

Cited by 250 publications

References 8 publications

Southward migration of continental volcanic activity in the Sierra de Las Cruces, Mexico: palaeomagnetic and radiometric evidence

Southward migration of continental volcanic activity in the Sierra de Las Cruces, Mexico: palaeomagnetic and radiometric evidence

The Neuquén composite section: magnetostratigraphy and biostratigraphy of the marine lower Jurassic from the Neuquén basin (Argentina)

A coherent middle Pliocene magnetostratigraphy, Wanganui Basin, New Zealand

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