Reversed-polarity overprint in dikes from the Troodos ophiolite: Implications for the timing of alteration and extension

Citation:
Gee, J, Varga R, Gallet Y, Staudigel H.  1993.  Reversed-polarity overprint in dikes from the Troodos ophiolite: Implications for the timing of alteration and extension. Geology. 21:849-852.: Geological Society of America

Keywords:

ASFA 2: Ocean Technology Policy & Non-Living Resources, Cretaceous, Cyprus, Troodos Mts., Troodos Ophiolite, dikes, ophiolites, Palaeo studies, palaeomagnetism, polarity, Q2 02148:Palaeo-studies, SW 0540:Properties of water, tectonics, Timing, Water Resources Abstracts

Abstract:

Paleomagnetic analysis of dikes from the Troodos ophiolite indicates the presence of a well-defined reversed-polarity overprint, an unexpected result given the currently accepted Cenomanian-Turonian age (88-91 Ma) suggesting formation during the Cretaceous Long Normal Period (83-118 Ma). This reversed- polarity component was apparently acquired prior to tectonic tilting of the dikes, implying that extensional tectonism occurred significantly (>5 m.y.) off axis. Alternatively, the paleomagnetic and field observations may be reconciled if parts of the ophiolite are significantly younger.

Notes:

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DOI:

10.1130/0091-7613(1993)021<0849:rpoidf>2.3.co;2