Interpretacja grawimetrycznej anomalii Tajno
Abstract
INTERPRETATION OF GRAVIMETRIC ANOMALY TAJNO
Summary
The interpretation has been made by a method worked out by D. C. Skeels. The pyroxenite intrusive body Tajno occurs in the granitoid mantle, where the average value of bulk density amounts to 2,70 G/cm3. The intrusive body is built up of a differentiated rock complex characterized by an average value of its bulk density equal to 3,14 G/cm3. Based on these assumptions the author has considered in his calculation a contrast of the density of rock equal to 0,44 G/cm3. As a result of the interpretation the following data have been obtained for the individual gravimetric sections:
Section A-B D1 D2 W
left side 826 1424 2421
right side 689 1406 1350
Section C-D
left side 576 1280 1280
right side 600 1250 2125
Section E-F
left side 550 1222 1464
right side 588 1251 2252
Section G-H
left side 580 1261 1891
right side 588 1089 2722
Where: D1- depth down to the top of the disturbing body in metres; D2 – depth down to the bottom of the disturbing body in metres; W - width of the disturbing body in metres. The interpretation made according to Skeels method creates a possibility to determine the surface extent of the intrusion. This extent has been presented in Fig. 1. The results obtained from bore holes Tajno 1, Tajno 3, and Tajno 5 corroborate the interpreted boundary of the intrusion. The bore hole Tajno 6 pierced the altered pyroxenite which proves the existence of a peripheric zone of the intrusive body. The results obtained in bore hole Tajno 2 are contradictory to the interpretation performed, this, however, can be an apparent contradiction only, since the melanocratic syenites pierced in bore hole Tajno 2 represent the younger intrusive phase, which, in principle, uses the systems of fine fissures in the basement. It is not unlikely that the main zone of the fissure system runs, in the form of a narrow strip from the Tajno anomaly northwards.
Full Text:
PDFRefbacks
- There are currently no refbacks.