NDTnet 1998 Aug, Vol.3 No.8

Abstract

The main aim of this study is to fill the data gap of petrophysical properties of so rare and unique materials from the Central Pacific Ocean transform faults.
The Non-destructive Structural petrophysical-anabsis (Starostin, 1979) was applied with two main research methods: 1) Free water saturation method - consist seven fixed in the time specimens weightings in the process of water saturation; 2) Ultrasonic waves velocities (P- and S-waves (Vp, Vs)) determinations. By computer processing the following parameters was obtained: effective porosity (Pef), density( ); Poisson's ratio (µ); Young's modulus(E); Shear modulus(G), Debye temperature() etc.The materials were selected from natural outcrops of Magellan (one sample), New Canton (2 samples), Clarion (5 samples) transform faults Central Pacific by dragging of 28th Mendeleev research vessel trip (1982). Petrographic characterization was made on the base of optical determinations. The results show that their physical properties vary in very large limits (see table).

		Pef		Vp	Vs	µ	E	G
No	Rock type	%	t/m3	m/s	m/s	-	10GPa	10GPa	K
1	Variolite hyaline basalt	22.01	2.21	3622	2233	0.19	2.58	1.08	289
2	Volcanic breccia	10.17	2.54	4241	2667	0.17	4.15	1.77	361
4	Dolerite	1.19	2.95	5727	3369	0.24	8.10	3.28	471
5	Aphyric amygdaloidal basalt	20.37	2.22	3513	2426	0.04	2.68	1.28	310
6	Gabbro	4.08	2.79	4785	2985	0.18	5.77	2.44	413
7	Gabbro	5.71	2.79	5674	3218	0.26	7.15	2.83	450
8	Basalt	17.12	2.38	4004	2365	0.23	3.22	1.31	315
9	Fine grained quartz rock	35.05	1.71	3718	2085	0.27	1.85	0.73	250
10	Basalt	19.14	2.27	3726	2318	0.18	2.84	1.20	302

This is a consequence of the very different rocks forming conditions. The betterplanning and special specimens collecting will significantly improve the petrophysicalmarine investigations, which with their productivity, simplicity, low costs and highlyinformativity will help very much in better describing and understanding of ocean floorforming processes.

1. Starostin, V. I. 1979. Structure-petrophysical analysis of endogenous ore fields. Nedra,Moscow, 257 p. (in Russian)

Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00

Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:

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