The use of converging remagnetization circles in palaeomagnetism

Halls, H. C.

doi:10.1016/0031-9201(78)90095-x

Cited by 184 publications

(80 citation statements)

References 9 publications

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“…The site-mean paleomagnetic directions were calculated using Fisher statistics [32] or the McFadden and McElhinny Method when individual characteristic directions had to be combined with great circle intersections with sector constraints [31]. We calculated the direction-means of LTC at "Period" level of geochronologic scale, and compared with the present Earth field (PEF) direction in geographic coordinates.…”

Section: Paleomagnetic Resultsmentioning

confidence: 99%

“…Remanence component directions were determined by principal component analysis of Kirschvink [30]. Figure (Figure 3(i)), but a great circle with sector constraints [31] could be used to determine the HTC. Dissimilar demagnetization behavior and magnetic properties among sites and sections may be an indication that the final direction (HTC), which is approximately identical if the rocks are the same geological age, are independent of lithology.…”

Section: Laboratory Paleomagnetic Analysismentioning

confidence: 99%

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Paleomagnetic results of Late Paleozoic rocks from northern Qiangtang Block in Qinghai-Tibet Plateau, China

Cheng

Guo

et al. 2011

Sci. China Earth Sci.

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Tectonic evolution of the Tethys and the boundary between the Gondwanaland and the Eurasia during the Carboniferous and Permian remain hotly debated. Qiangtang region in the Qinghai-Tibet Plateau may be a key place to study these problems. A paleomagnetic study was conducted on the Late Paleozoic rocks in the northern Qiangtang region (33.7°N, 86.7°W), Tibet. Two sites (21 samples) in the Upper Carboniferous, eleven sites (101 samples) in the Permian, and two sites (16 samples) in the Lower Triassic were investigated. The rock magnetic data revealed hematite and magnetite as the main magnetic carriers. In stepwise thermal demagnetization and/or combined alternating field (AC) demagnetization, two characteristic components in the majority of the samples were identified as (1) the Low-temperature Component (LTC), characterized by northerly declination and moderate to steep inclination, corresponding to a pole position overlay with the present North Pole. A minority of the samples present single component, and their directions are the same as (2) the High-temperature Component (HTC) of double components. The combined single-component and HTC data of the Permian can pass the R-test at 95% level and the F-test at 99% level, as well as the BC-test. The pole position from the Late Carboniferous is at 31.8°S, 45.7°E with dp=2.1, dm=3.9, that from the Early and Middle (Late) Permian is at 31. 7°S, 46.8°E with dp=9.2, dm=16.9 (34.4°N, 54.1°E with dp=6.9, dm=12.5) respectively, and that from the Early Triassic is at 16.9°S, 22.5°E with dp=4.9, dm=9.2. These pole positions are different from the other poles for the Qiangtang Block, which suggests the single-component and HTC directions are probably a primary magnetization and the northern Qiangtang Block was paleogeographically

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Section: Paleomagnetic Resultsmentioning

confidence: 99%

Section: Laboratory Paleomagnetic Analysismentioning

confidence: 99%

Paleomagnetic results of Late Paleozoic rocks from northern Qiangtang Block in Qinghai-Tibet Plateau, China

Cheng

Guo

et al. 2011

Sci. China Earth Sci.

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“…For analysis, demagnetization results were plotted as orthogonal vector diagrams [Zijderveld, 1967] and equal-area projections. Paleomagnetic directions were determined using principal component analysis [Kirschvink, 1980] or using the remagnetization circles technique [Halls, 1978]. Site-mean directions were determined using the statistics of Fisher [1953] Eurasia for 60 and 40 Ma by 20.80+9.9 ø and 25.90+9.8 ø , respectively.…”

Section: Paleomagnetic Resultsmentioning

confidence: 99%

Resolving the problem of shallow magnetizations of Tertiary age in Asia: insights from paleomagnetic data from the Qiangtang, Kunlun, and Qaidam blocks (Tibet, China), and a new hypothesis

Cogné¹,

Halim²,

Chen³

et al. 1999

J. Geophys. Res.

121

122

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“…Such classifications usually hinge on whether a "characteristic" component of magnetization can be determined from principal component analysis (PCA) of a sequence of data points [Kirschvink, 1980] or whether it must be estimated from the extrapolated intersection of remagnetization circles from a number of specimens from a site [Halls, 1976[Halls, , 1978McFadden and McElhinny, 1988]. This has often been done without properly establishing that the chosen characteristic component really is the primary, detrital component of remanence.…”

Section: Characterization Of Progressive Demagnetization Datamentioning

confidence: 99%

Toward an understanding of the multicomponent magnetization of uplifted Neogene marine sediments in New Zealand

Turner¹

2001

J. Geophys. Res.

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Abstract. New Zealand contains many sequences of tectonically uplifted Miocene/Pliocene marine sediments, which have been central to the development of a biostratigraphic framework for temperate southern latitudes. Chronological control is almost invariably dependent on magnetostratigraphy. Interpretation of the natural remanent magnetization (NRM) of these sediments is, however, notoriously difficult because of the weak magnetization, secondary components that resist demagnetization, and thermal instability of the clay minerals. A new paleomagnetic study of Wanganui Basin sediments has yielded unusually well defined demagnetization data from which systematic characterization, explanation, and interpretation of the multicomponent nature of the NRM have been possible.In general, the magnetization consists of three components: (1)

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The use of converging remagnetization circles in palaeomagnetism

Cited by 184 publications

References 9 publications

Paleomagnetic results of Late Paleozoic rocks from northern Qiangtang Block in Qinghai-Tibet Plateau, China

Paleomagnetic results of Late Paleozoic rocks from northern Qiangtang Block in Qinghai-Tibet Plateau, China

Resolving the problem of shallow magnetizations of Tertiary age in Asia: insights from paleomagnetic data from the Qiangtang, Kunlun, and Qaidam blocks (Tibet, China), and a new hypothesis

Toward an understanding of the multicomponent magnetization of uplifted Neogene marine sediments in New Zealand

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