Magnetic fabric analysis of the Plio-Pleistocene sedimentary formations of the Coastal Range of Taiwan

Details Magnetic fabric analysis of the Plio-Pleistocene sedimentary formations of the Coastal Range of Taiwan Magnetic fabric analysis of the Plio-Pleistocene sedimentary formations of the Coastal Range of Taiwan

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..98...23t&link_type=abstract

Earth and Planetary Science Letters, Volume 98, Issue 1, p. 23-32.

Computer Science

23

Scientific paper

Over 2100 samples were collected from 130 sedimentary sites of early Pliocene to Pleistocene age in the Coastal Range of Eastern Taiwan. Their lithology is mainly unmetamorphosed marls, siltstones and sandstones and the formations are folded and faulted at different scales. Different shapes of the susceptibility ellipsoid were observed from an oblate form, with Kmin closely perpendicular to the bedding plane, to a ``pencil'' structure, with Kmin ~ Kint forming a girdle around Kmax, reflecting an increasing tectonic contribution to the magnetic fabric. At sites where fault tectonic analysis is available, the magnetic lineation is perpendicular to the main compression. These results have a twofold significance: first, confirming previous preliminary results, they show that in such visually undeformed sediments the magnetic fabric may be, at least in part, of tectonic origin. Second, when considered together with recent paleomagnetic and tectonic data, they suggest that in the Plio-Pleistocene sediments of the Coastal Range of Taiwan the magnetic lineation arises from the compression due to the collision of the Philippine Sea and the Eurasian plates. In our interpretation, the stress pattern has rotated clockwise along with the structures during this collision.

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