Conjugate zone between the northern termination of the Baikal-Patom Foldbelt and the Siberian Craton: Structure of the crystalline basement |
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Authors: | V A Bush |
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Institution: | 1.Aerogeophysica Inc.,Moscow,Russia |
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Abstract: | New data on the deep structure of the crystalline basement in the conjugate zone between the northern termination of the Baikal-Patom
Foldbelt and the Siberian Craton are discussed. Digital processing of the data of a high-precision airborne geophysical (magnetic,
gravity, radiometric) surveys on a scale of 1: 50000 allows us to construct 3D models of the petrophysical properties of the
rocks and to ascertain the main features of the deep structure of the pre-Riphean crystalline basement overlapped by a thick
sedimentary cover. The Archean and Paleoproterozoic metamorphic and plutonic petrophysical complexes are identified, and their
vertical and horizontal relationships are outlined. Horizontal tectonic movements and overthrusting for many tens of kilometers
are interpreted in the internal structure of the crystalline basement. The tectonic overriding of the marginal part of the
Siberian Craton by nappes of the Baikal-Patom Foldbelt is proved. In particular, the completely detached, allochthonous position
of the Kotuikan Zone along which the Magan and Daldyn terranes cojugate with the Aldan Province in the south of the craton
is established. This compels us to consider a re-evaluation of the currently accepted concept concerning the structure and
formation history of the basement of the ancient Siberian Craton. |
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