A middle Carnian to early Norian (~225 Ma) paleopole from sediments of the Newark Basin, Pennsylvania

W. K. Witte, D. V. Kent

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Abstract

Paleomagnetic study of the middle Carnian Stockton Formation, upper Carnian Lockatong Formation, and the lower part of the Norian Passaic Formation from 24 sites along 3 traverses perpendicular to strike in the Newark Basin of eastern Pennsylvania shows that two hematitic magnetizations can be isolated from these rocks. Thermal demagnetization experiments reveal a distributed unblocking temperature (typically 300 to 680°C) magnetization with uniformly downward and northerly directions, and a high unblocking temperature (660°C and above) magnetization with shallow northerly (normal polarity) and southerly (reversed polarity) directions. The pole calculated from the high unblocking temperature magnetization (53.6°N, 101.6°E, A95 = 4.8°) is consistent with other Late Triassic poles and indicates a paleolatitude of 3.8°N ± 3.0°. The lower unblocking temperature magnetization is an overprint acquired at about the same time as the Jurassic Newark trend igneous N2 pole magnetization. -from Author

Original languageEnglish (US)
Pages (from-to)1118-1126
Number of pages9
JournalGeological Society of America Bulletin
Volume101
Issue number9
DOIs
StatePublished - 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geology

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