A palaeomagnetic reconnaissance of Kashmir, northwestern Himalaya, India

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Scientific paper

Thermal demagnetization studies of 800 Palaeozoic and Lower Mesozoic samples, mainly carbonates, from 14 localities in Kashmir, showed four magnetic components:
(A)A recent field component of normal polarity and large intensity.
(B)A Middle to Late Tertiary secondary component of large intensity and of reversed and normal polarity, which indicates clockwise rotation of central and eastern Kashmir over approximately 45° with respect to peninsular Indo-Pakistan.
(C)Primary magnetic components of Triassic, Late Permian, Early Carboniferous, Siluro-Ordovician and Middle to Early Ordovician age. The Triassic and Late Permian components show a 20-30° cumulative counterclockwise offset with respect to the Indo-Pakistan apparent polar wander path (APWP). This indicates a post-Middle to -Late Triassic counterclockwise rotational movement of Kashmir over 65-75° with respect to peninsular Indo-Pakistan.
(D)A component of low inclination and predominantly east-west declination, which is observed only in rocks of pre-Panjal Traps age. A secondary origin associated with extrusion of the Panjal Traps flows is surmised, but could not be established beyond doubt. Alternatively, this component may be related to the regional foliation.
The Triassic and Late Permian primary component directions are predominantly of normal polarity. This suggests a pre-Punjabian (Late Permian) upper age limit for the Permo-Carboniferous (Kiaman) reversed polarity interval, which is earlier than the Early to Late Tatarian limit observed in the U.S.S.R.

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