Rotated paleomagnetic poles from the Sassamansville syncline, Newark basin, southeastern Pennsylvania

Kodama, Kenneth P.; Hedlund, Christopher A.; Gosse, John C.; Strasser, Juliette W.

doi:10.1029/93jb02763

Cited by 11 publications

(16 citation statements)

References 28 publications

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“…This direction is very similar to the`B' component in the Newark Basin , and in inclination to the Sassamansville Diabase (Kodama & Mowery 1994) and a`B' component seen in the Passaic sediments in the Sassamansville syncline (Kodama et al 1994b). The oldest igneous phase, the HTQ Holden diabases, have a peak unblocking temperature of 570 uC and carry a shallow normal polarity with northeasterly direction coincident with the primary direction in the mudstones.…”

Section: Discussionsupporting

confidence: 56%

“…Coincident with these elevated temperatures was extensive hydrothermal activity and¯uid migration (Hubert & Dutcher 1999), providing for the bleaching of the arkoses and production of new ferric iron phases. It must be noted that, if the site locations for these sample are rotated some 15u, the directions move into coincidence with other Newark Basin overprint directions, as suggested by Kodama et al (1994b). The arkose B component is not unlike a remagnetized direction in the Sassamansville Diabase (72uN, 137uE) determined by Kodama & Mowery (1994) and a B component seen in the Passaic sediments in the Sassamansville syncline of 67uN, 147uE (Kodama et al 1994b).…”

Section: Redbed/dyke Pole Comparisonsmentioning

confidence: 56%

“…Evidence supporting this is found in reset ®ssion-track ages of 118±130 Ma (Roden & Miller 1991) in the Deer®eld Basin, which indicate that closure temperatures for apatite did not occur until the Middle to Late Jurassic (Roden & Miller 1991). The arkose B component is not unlike a remagnetized direction in the Sassamansville Diabase (72uN, 137uE) determined by Kodama & Mowery (1994) and a B component seen in the Passaic sediments in the Sassamansville syncline of 67uN, 147uE (Kodama et al 1994b). The interbedded mudstones were generally impermeable to extensive bleaching (Stevens & Hubert 1980;Hubert & Dutcher 1999), and, although they experienced some alteration, were able to retain their original component of magnetization.…”

Section: Redbed/dyke Pole Comparisonsmentioning

confidence: 62%

“…Considerable palaeomagnetic work has been undertaken recently in eastern North America (McIntosh et al 1985;Witte & Kent 1990, 1991Kent et al 1995;Kent & Olsen 1997;Kodama & Mowery 1994;Kodama et al 1994aKodama et al , 1994b, with attention given to both sedimentary and interbedded volcanic units of the Newark Supergroup (Olsen 1978(Olsen , 1997. These continental sediments (`redbeds') and extrusive volcanic rocks accumulated from the Late Triassic to Early Jurassic in a series of extensional basins as a result of initial separation between North America, Africa and Europe.…”

Section: Introductionmentioning

confidence: 99%

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Palaeomagnetism, rock magnetism and geochemistry of Jurassic dykes and correlative redbeds, Massachusetts, USA

McEnroe

Brown²

2000

Geophysical Journal International

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Jurassic diabase dykes, sills and sedimentary rocks in central Massachusetts were sampled for palaeomagnetic analysis. The intrusions fall into three of the chemical types for eastern North American diabases: high TiO2 quartz‐normative (Holden); low TiO2 quartz‐normative (Ware); and high Fe2O3 quartz‐normative (Pelham–Loudville). The characteristic magnetizations in the majority of intrusive samples unblock between 550 °C and 580 °C, with Curie temperatures in a discrete interval between 556 °C and 580 °C. The dominant remanence in the diabases is carried by C1 to C3 oxidation‐exsolved titanomagnetite occurring as euhedral grains, as fine needles or dust in the matrix, as devitrifed glass, and as fine magnetite‐ilmenite‐silicate symplectite. In some dykes, titanomagnetite was further modified by deuteric oxidation during post‐magmatic cooling, creating titanomaghematite and/or a granulation of the magnetite. Palaeopoles for the three diabase groups are: Holden, 60.1°N, 80.5°E, A95 = 4.1°; Ware, 73.5°N, 85.8°E, A95 = 3.9°; and Pelham–Loudville, 65.3°N, 95.6°E, A95 = 4.1°. These data are combined with samples from two stratigraphic sections through the Early Jurassic part of the Sugarloaf Formation in the Deerfield Basin representing both fine‐grained mudstones and coarser arkoses. These haematite‐dominated rocks reveal several components of magnetization, a steep recent field direction, an intermediate secondary diagenetic overprint direction in both mudstones and arkoses, and a high‐temperature shallow primary direction found only in the mudstones. Palaeopoles for the Sugarloaf Formation are: mudstones, 57.7°N, 81.3°E, A95 = 9.1°; and arkoses, 75.1°N, 131.6°E, A95 = 5.9°. Based on the new palaeomagnetic data reported here, the North American plate in the Middle Jurassic was at higher palaeolatitudes than indicated by the present North American apparent polar wander path.

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Section: Discussionsupporting

confidence: 56%

Section: Redbed/dyke Pole Comparisonsmentioning

confidence: 56%

Section: Redbed/dyke Pole Comparisonsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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Palaeomagnetism, rock magnetism and geochemistry of Jurassic dykes and correlative redbeds, Massachusetts, USA

McEnroe

Brown²

2000

Geophysical Journal International

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“…Age given to nearest 5 My. References: (1) Ekstrand & Butler (1989); (2) Smith & Noltimier (1979); (3) Kodama et al (1994); (4) Prevot & McWilliams (1989); (5) Witte & Kent (1990); (6) Kent & Witte (1993); (7) Reeve & Helsley (1972); (8) Bazard & Butler (1991); (9) Witte et al (1991); (10) Larochelle & Currie (1967); Robertson (1967); (11) Bazard & Butler (1991); (12) Steiner & Lucas (2000); (13) Molina‐Garza et al (1996); (14) Molina‐Garza et al (1998); (15) Witte & Kent (1989); (16) Fang & Van der Voo (1988); (17) Grubbs & Van der Voo (1976); (18) Wynne et al (1992); (19) Molina‐Garza et al (1991); (20) Helsley & Steiner (1974), Molina‐Garza et al (1991), Purucker et al (1980); (21) Van der Voo & Grubbs (1977), Shive et al (1984), Herrero‐Brevera & Helsley (1983); (22) Molina‐Garza et al (1996); (23) Molina‐Garza et al (2000); (24) Molina‐Garza et al (1989); (25) Peterson & Nairn (1971); (26) DeBoer & Brookins (1972); (27) Peterson & Nairn (1971); (28) Symons (1990); (29) Helsley (1971), Gose & Helsley (1972); (30) Diehl & Shive (1979); (31) Peterson & Nairn (1971); (32) Steiner (1988); (33) Gose & Helsley (1972); (34) Diehl & Shive (1981); (35) Peterson & Nairn (1971); (36) Steiner (1988).…”

Section: Methods and Apw Pathsmentioning

confidence: 99%

Pre-drift extension of the Atlantic margins of North America and Europe based on paths of Permo-Triassic apparent polar wander

Beck

Housen

2003

Geophysical Journal International

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SUMMARY We reconstruct the relative configuration of North America and Europe prior to separation using paths of apparent polar wander (APW) for the interval 300 to 200 Ma. The Bullard et al. (1965) reconstruction closely superimposes the 300 Ma points on the two APW paths but leaves the 200 Ma points far apart. Conversely, anomaly‐based reconstructions for later times approximately superimpose the 200 Ma ends of the paths but leave the older ends far apart. This indicates that separation of the interiors of the two continents began during the interval 300 to 200 Ma, long before surficial rifting commenced in the late Mesozoic. This in turn requires pre‐rift extension in the two continental margins. Extension appears to have occurred in two phases of approximately equal magnitude but significantly different direction; the change in direction occurred at about 200 Ma. The earlier (300 to 200 Ma) episode of extension appears to have involved a strong element of sinistral shear. Based on our preferred reconstruction, the total amount of pre‐rift extension of the two continental margins may have been as much as 1400 km.

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The role of true polar wander on the Jurassic palaeoclimate

Llanos

Prezzi

2012

Int J Earth Sci (Geol Rundsch)

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From the Late Carboniferous until the Middle Jurassic, continents were assembled in a quasi-rigid supercontinent called Pangea. The first palaeomagnetic data of South America indicated that the continent remained stationary in similar present-day latitudes during most of the Mesozoic and even the Palaeozoic. However, new palaeomagnetic data suggest that such a scenario is not likely, at least for the Jurassic. In order to test the stationary versus the dynamic-continent model, we studied the Jurassic apparent polar wander paths of the major continents, that is, Eurasia, Africa and North America that all in all show the same shape and chronology of the tracks with respect to those from South America. We thus present a master path that could be useful for the Jurassic Pangea. One of the most remarkable features observed in the path is the change in pole positions at *197 Ma (Early Jurassic), which denotes the cessation of the counter-clockwise rotation of Pangea and commencement of a clockwise rotation that brought about changes in palaeolatitude and orientation until the end of the Early Jurassic (185 Ma).Here, we analyse a number of phenomena that could have triggered the polar shift between 197 and 185 Ma and conclude that true polar wander is the most likely. In order to do this, we used Morgan's (Tectonophysics 94:123-139, 1983) grid of hotspots and performed ''absolute'' palaeogeographical reconstructions of Pangea for the Late Triassic and Jurassic. The palaeolatitudes changes that we observe from our palaeomagnetic data are very well sustained by diverse palaeoclimatic proxies derived from geological and palaeoecological data at this time of both the southern and northern hemispheres.

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Rotated paleomagnetic poles from the Sassamansville syncline, Newark basin, southeastern Pennsylvania

Cited by 11 publications

References 28 publications

Palaeomagnetism, rock magnetism and geochemistry of Jurassic dykes and correlative redbeds, Massachusetts, USA

Palaeomagnetism, rock magnetism and geochemistry of Jurassic dykes and correlative redbeds, Massachusetts, USA

Pre-drift extension of the Atlantic margins of North America and Europe based on paths of Permo-Triassic apparent polar wander

The role of true polar wander on the Jurassic palaeoclimate

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