University of Nigeria Virtual Library

Serial No

Author 1

ONUOHA, K. M.

Author 2

Author 3

Title

Reconnaissance Geophysical and Geochemical investigations of the

Ophiolites of the darno tectonic-line (NE HUNGARY)

Keywords

Description

Reconnaissance Geophysical and Geochemical investigations of the

Ophiolites of the darno tectonic-line (NE HUNGARY)

Category

Physical Science

Publisher House of The Hungarian Academy of Sciences

Publication Date 1981

Signature

/

.......

~

SEPARATUM

~RECONNAISSANCE GEOPHYSICAL AND

GEOCHEMICAL INVESTIGATIONS OF THEOPHIOLITES OF THE DARNO TECTONIC-LINE

(NE HUNGARY)

By

K. M. ONUOHA

DEPT. OF GEOPHYSICS, EOTVOS L. UNIVERSITY, BUDAPEST

The results obtained from a series of petrophysical, geochemicaJ and fiJmagnetic investigations of the mafic and ultramafic complexes aJong the Darno-lsuggest a strong genetic affiliation to similar occurrences elsewhere in the Alpin4Mediterranean region. Geochemical evidence suggests that the originaJ basaJtic magwas tholeitic and the differentiation and fractionation trends agree well with tbfor abyssal tholeiites from the ocean floor. Y/Nb ratios, Ti-Cr relations and the mo~de ~hemistry all support this view ?nd. rule out the p.ossib~~y of~~he ~~neou~~~,-~ ,~.~~_~1a.G n~~u~.o~~o. A-_~._.:I.-- --'.. ~-- A_- - _A___A--

.AKADEMIAI KIAD6, BUDAPEST

PUBLISHING HOUSE OF THE HUNGARIAN ACADEMY OF SCIENCESVERLAG DER UNGARISCHEN AKADEMIE DER WISSENSCHAFTEN

MAISON D'EDITIONS DE L'ACADEMIE DES SCIENCES DE HONGRIE113~ATEJ1bCTBO AI{A~EMI1I1 HAYK BEHrpl111

»... ""~~, ".~ -- ----

(:'

Acta Geologica Academiae Scientiarum Hungaricae, Tomu& 21 (4), pp. 197-206(1977)

RECONNAISSANCE GEOPHYSICAL ANDGEOCHEMICAL INVESTIGATIONS OF THE

OPHIOLITES OF THE DARNO TECTONIC-LINE(NE HUNGARY)

By

K. M. ONUOBA

DEPT. OF GEOPHYSICS, EOTVOSL. UNIVERSITY, BUDAPEST

The results obtained from a series of petrophysical, geochemicaJ and fieldmagnetic investigations of the mafic and ultramafic complexes aJong the Darno-linesuggest a strong genetic affiliation to similar occurrences elsewhere in the Alpine-Mediterranean region. Geochemical evidence suggests that the original basaltic magmawas tholeitic and the differentiation and fractionation trends agree well with thosefor abyssal tholeiites from the ocean floor. YjNb ratios, Ti-Cr relations and the majoroxide chemistry all support this view and rule out the possibility of the igneous seriesbeing intra-plate occurrences created in situ by magmatic activity. Negative magneticanomalies (LIZ, LIT) were measured over the complex and the interpretative modelsseem to bear out the allochthonous position of these rock suites. The magnetic propertiesof two rock units of the complex (diabases and gabbros) are compared with those fromsimilar units of other ophiolites, but the preliminary results cast doubts on the suit-ability of these rocks for detailed paJeomagnetic studies because of the effects of tectonicoverprinting.

Introduction

c

A lot of attention is being paid at present to the study of ophiolite com-

plexes all over the world. This has come about mainly with the identification

of ophiolites as slices of the suboceanic lithosphere tectonically emplaced onthe continental margin during convergence of two continental blocks. These

rock suites mark the suture zones where oceanic lithosphere was consumed bysubduction. A detailed study of ophiolite complexes contributes a lot to the

paleographical and paleotectonic reconstruction of the area where they occur.The Darno-line is perhaps the most important tectonic feature in the

northern half of Hungary. Trending NNE-SSW, it divides the formations

of the Biikk Mts from those of the Central Hungarian Mts (Fig. 1). The linetowards the SE joins the Balaton-line which is supposed (WEIN, 1969; DANK

and BODZAY, 1971) to be the continuation in the Pannonian region of the Peri-adriatic Lineament, the major dividing feature between the Southern and

Northern Alps. The Darno-line appears distinctly on Bouguer anomaly, magneticand aerial photo-geological maps. Mafic and ultramafic rocks occur in several

places along the Balaton-Darno-line, but the complexes investigated in detailin this study are those around Mt. Darno (between Sirok and Recsk), Bator,Szarvasko and Belapatfalva (Fig. 2).

Acta G.alogiea Aeademiae Seienliarum Hungarieae 21, 1977

198 ONUOHA, K. M.

0L

50 km,

Ror;;oyo

N

11

1t5

Fig. 1. Schematic geological map of NE Hungary. 1. Paleozoic; 2. Mesozoic; 3. Neogene;4. Neogene volcanites; 5. Ophiolites

6 km I JV7 /11111\\ Ophiolites J 1~/esr ~Y

\ ,"V

n Petervasara ~~O/ tauerboas\J ~~1 Of tA1S ~V

~St.tA ~\~'" IIC 0 lJ~G~'\RI~SSI~~\.. \-I ~8Jkkszek

t. cO~ / /,\-I &rerpes II

I I

~tradereC ~k:J / :.wiP . /. E. rbakfa

Recskr--"l /, oorn"(l..3;°k tAEtll 0!:.

~ / ~ \1lI W Il.r 9~SE "'V

/ ~ II 1PI~SS\~f 1\-1e:~'TIOtlSf OPtA

/ / 8U1<1<

Fig. 2. Position of the investigated ophiolites of the Darno tectonic zone

0L

.IC?sdfor

Acla Geologica Academioe Scienliorum Hungaricoe 21, 1977

D 8elapdtfalva

( ({Ct

,(,((t

RECONNAISSANCE OF THE OPHIOLITES 199

Structural and Tectonic Backgrouud

Near Szarvasko the ophiolite sequence is complete (radiolarites and

pelagic sediments - pillow lavas and diabases - gabbros - quartz diorites -peridotites, in a more or less pseudo-stratigraphical order, from the top down-wards). Depending on the pyroxene contents, the peridotites which occur atthe deeper levels grade iuto pyroxenite. Hornblendite and wehrlite occur at

the core of the ultramafic complex. Complete petrographic and stratigraphicdescriptions of the complexes have been given by: SZENTPETERY (1953) and

LENGYEL (1957) for the Szarvasko area, KISS (1958) and FOLDESSY (1975)for the Mt. Darn6-Sirok area, and by PANTO and FOLDVARI (1950) for theoccurrences along the B6dva valley in the northeastern-most corner close to

the Czechoslovakian border. SZEPESHAZY (1977) has also discussed the struc-

tural positions of these rock complexes.

Early work done on these mafic and ultramafic rocks (like those quoted

above) were mainly in connection with mineral prospecting. The first attemptto incorporate them into the plate tectonic hypothesis was by SZADECZKY-KARDOSS (1971) when he identified the Balaton-Darn6-line as a U. Creta-

ceous-Paleogene subduction zone. In subsequent works (SZADECZKY-KARDOSS,

1975, 1976) he pointed out the possible connection between the ophiolite occur-

rences and the Eocene andesite volcanism west of the Darn6-line, and gave amodel for the plate tectonic evolution of the Pannonian region. The paleo-

geographical reconstructions of CHANNELL and HORVATH (1976) and HORVATHand CHANNELL (1977) also took into account the ophiolite occurrences of theBalaton-Darn6-line.

In this paper results of a series of geochemical, field magnetic and petro-

physical investigations are discussed. The geochemical studies have helpedto clarify the original tectonic setting of the igneous rock suites, while field

studies support the view that the rocks are in allochthonous positions.

While most of the problems pertaining to these rocks are gradually beingsolved, one particular problem, however, still remains an engima. This is the

problem of ascertaining the right ages of these rocks. Ages suggested for theophiolites include Upper Paleozoic, Triassic (BALOGH, 1964; ZELENKA, 1975;

FOLDESSY, 1975), Cretaceous (PANTO-FoLDVARI, 1950). Such diversities inopinion are caused by the fact that no diagnostic fossils have been found in

the sedimentary volcanic assemblage itself. On the basis of the ages of similaroccurences in the Alpine-Mediterranean area an Upper Jurassic-Lower Creta-

ceous age has also been suggested (SZEPESHAZY, 1977; ONUOHA, 1977a). Radio-metric age determination of the rocks as well as geochronological work basedon the available radiolarias should be an urgent matter for the immediatefuture. The work of KOZUR and MOCK (1977) on the Meliata series of the SW

3 Acla Geologica Academiae Scienliarum Hungaricoe 21, 1977

"~"'~""~"~~"" " .".

200 ONUOHA, K. M.

Biikk Mts. has helped to solve part of the problems mentioned earlier. On the

basis of conodonts they have ascertained a Middle Triassic - Upper Carnianage for the sedimentary series associated with the ophiolites.

Geochemical Investigations

The major oxide contents of the rock units of the ophiolites formed the

basis of the geochemical study. Ten samples were also analysed for their Ti,

Sr, Y, Nb and Cr contents. A separate and detailed account of the geochemical

investigations has been published by the author (ONUOHA, 1977b). Making useof several variational parameters (Na20 + K20 versus Si02; Si02 versusFeOtjMgO; FeOt versus FeOtjMgO; Ti02 versus FeOtjMgO; YjNb ratio;

Ti-Cr relation of PEARCE (1975); FeOt = Fe20s + FeO), it was found thatthe differentiation and fractionation trends for the complex agree very well

with those of other ophiolite complexes, and with that of abyssal tholeiites

from the ocean floor. YjNb ratios for the complex are high (2.75-8.75), thussupporting the tholeitic nature of the rocks. The Ti02-FeOtjMgO and the

Ti-Cr relations not only confirm their similarity to ocean floor basalts, butalso bear out the fact that their original tectonic settings had nothing to do

with island arc magmatism.

Magnetic Anomalies and Rock Magnetic Studies

Detailed field magnetic work with a proton precession magnetometerwas carried out along several profiles that cut across the Darno-line. As re-ported earlier by the author (ONUOHA,1977), the ophiolite outcrops are as-sociated with negative LIT anomalies. The most intensive minimum values(-400 gammas) were recorded over the largest, thickest outcrops. The mag-netic profiles celarly reflected the sub-surface distribution of the mafic rocks(Fig. 3). An interpretative model using a series of steeply inclined dykes offinite lengths appears to explain the observed anomalies over Mt. Darno.On the basis of a regional magnetic survey carried out earlier in the area a 15 kmlong, 1-2 km wide anomaly showed up between Sirok and Bator. This anomalygoes right up to the western margin of Mt. Darno in a branch that is about500 m wide and 3 km long. According to the estimates of the specialists atthe State Geophysical Institute (Annual Report, 1973), the interpretation gavea body 70 m deep, 150 m wide with a NE-SW strike, and dipping deeplyunder Mt. Darno. The susceptibjlity contrast between the volcanic rocks andthe country sedimentary rocks is appreciable enough to give the type of cor-relation that is reflected in Fig. 3.

Acta Geologica Academiae Scientiarum Hungaricae 21, 1977

(d[t

«(0

,~" ,,, .,,'

RECONNAISSANCE OF THE OPHIOLITES 201

tJT /rl

100

50

0

-50

-100

-150

150

100

50

a~f .2 -50

-100

-150EJ3000

000:0:1" [35

Fig. 3. Magnetic profiles over Mt Darno and their correlation with sub-surface features:1. Upper Paleozoic (Permian) limestones; 2. (Triassic?) marls and shales; 3. (Jurassic-Creta-ceous?) spilite diabase-pillow lava formations; 4. Terrigenous and 5. Marine clastic sediments

(Neogene)

It was thought necessary to carry out preliminary rock magnetic in-vestigations of certain units of the complex with a view of determining the

suitability of those units for detailed and reliable paleomagnetic work. The

results to the magnetic susceptibility K, initial N.R.M. intensity In andKOENIGSBERGER ratio Q of two of the rock units (diabases and gabbros) areshown in Table 1 and in Figs 4 and 5. The gabbros and diabases have sus-

ceptibilities of the same order of magnitude (10-S GjOe), and cannot be sep-arated from each other on the basis of susceptibility alone. The initial NRM

3*Acta Geologica Academiae Scientiarum Hungaricae 21, 1977

202 ONUOHA, K, M,

intensities are significantly different, being nearly three times greater for the

diabases. The KOENIGSBERGER ratio is almost three times greater for the dia-

bases, than for the gabbros, but both average values are of the order of 10-3,

values not characteristic of basic rocks. A comparison of the rock magnetic

Table 1

Magnetic properties of two rock units from the Darn6 ophiolite complex

* Numbers in parentheses is the number of samples considered for the investigation. Allmean values were computed from the log-normal distribution

N

10

8~~to~ 6~

~ *

D O~bbroillIIIIDlobase

::::, ,

':-: :::: :::;

",'

1

«)<::::::: -:-: ';',1

2

-3 -2log,o K

Fig. 4. Magnetic susceptibility (log-normal distribution)

properties of theses rock units with those for similar units of other ophiolite

complexes from other parts of the world is made in Fig. 6.

The low J n values and the extraordinarily low Q values deserve some fewcomments. Since there is no doubt about the basicity of the rocks, and sincetheir ocean floor affinities have been ascertained geochemically, it appearsthat the low In and Q values are due to some or all of the following factors:

a) the effect of weathering (all the samples considered for the rockmagnetic studies were from surface outcrops);

Acla Geologica Academiae Scienliarum Hungaricae 21, 1977

(, «.

<"tD

.""".,.,,,,, ...,

N

6

5

.. *.!!!

~~ 3~<:i

:;;;:2

RECONNAISSANCE OF THE OPHIOLITES

.," .

.',' .','

{::;:',', .','

>(>:!i.H!:.

:>:: FHI

<<

1

<> ',', '-:' .':-',', :>: :-::

-6 -5/0910 In

Fig. 5. Distribution of initial NRM values

1 j r , 'Seguin(1976)

Fig. 6, Comparison of rock magnetic properties

203

D Gabbro

ffiJII) Diabase

-4

Darnor.

~1

1!1t~

'ii

II

I,

Acta Geolo~ico Academiae Scientiarum Hun~aTicae 21, 1977

Susceptibility NMR intensity Koenigsbergerratio

Rock type (K ' 10-. GjOe) (J.. ' 10-. G) Q , 10-1 (F= 0,45 Oe)

range I mea.. range I mea.. range I mean

G-abbro (13)* 74-151 112 (29) 0.36-18.62 4.30 (17) 1.18-35.09 6.64

Diabase (39) 35-471 116 (21) 1.22-94.37 11.39 (11) 6.84-44.54 18.81

Kizll OaghHatay

Troodos (Turkey) QuebecI I I 1 r--

K(GlOe)

'I

:"'.rl

'H

i il"" '§.:;.!;

t ,,lt'::;1;

'!!i"-'!

i t

/0'3

.,. T,1!< " Ii 1i " <:Ii 1>" '" I1fj' :t ""i';: i:. .. ::

JI/RH(0)

tf'I II10'5

IJIll

J)'.

11

'xj'

'I, I10'1

Q (f'o.5)

10'4

10'3,

10'2

10"

;.j rWI10'2Mooes and Cagulu

V,ne eta/.(1972) (1975)

--.""" --- .- .n ~~

204 ONUOHA,K.M.

b) low-temperature oxidation of the remanence carrying titanomagneticminerals;

c) tectonic overprinting. At present we do not yet know for sure what

possible changes in magnetic properties occur during the obduction of ophio-

lites. Large-scale tectonic interactions and whole-sale deformation haveoccurred all along the Darno-line. The effects of these tectonic processes on the

original magnetic properties are difficult to ascertain, but presumably theymust have been destructive.

Discussion of the Results

The stratigraphy and geochemistry of the Darno mafic and ultramafic

rocks favour an ocean floor origin for them. The fractionation and differentia-

tion trends resemble those of abyssal tholeiites from the ocean floors. Thedetected magnetic anomalies seem to suggest that the rocks are in allochthonous

positions and are not deeply rooted. Induced polarization investigationscarried out in the area confirmed that the whole morphological area of Mt.

Darno is a foreign body in the Matra surroundings (Annual Report, 1973).Most probably, the Darno zone marks an oceanic suture; thus the usual inter-

pretation given to the complexes as in situ volcanic occurrences has to be re-viewed.

The chemical characteristics of the Darno ophiolites are very similar

to those of the Upper Schieferhiille of the Penninic windows of the Tauern

and Strobl as described by BICKLE and PEARCE (1975),OBERHANSLI and

DIETRICH (1975), and RAITH et al. (1977). The reconnaissance rock magneticstudies reveal that paleomagnetic work on the ophiolit~s may not be reliable

unless the samples were subjected to the most complicated and sophisticated

processes of magnetic cleaning to remove the imprints of past tectonic pro-

cesses. There are also other views (e.g. P. MARTON; personal comm.) that be-

cause of the paucity of data the present rock magnetic results may not bediagnostic of the whole mafic-ultramafic rocks of the Darno zone. However,

at present it appears that if paleotectonic reconstructions for the area haveto make use of paleomagnetic data, then such data would have to be for rocks

from the less disturbed (autochtonous?) sedimentary units, and not for theophiolites.

The Darno ophiolites are genetically related to similar occurrences found

in the Mesozoic of the Gemerides. Any explanations for the origin and tectonicpositions of the Darno complex would thus have to be valid for the are allydispersed complexes of the Southern Gemerides. The Darno-line has beeninterpreted as a subduction zone (SZADECZKy-KARDOSS, 1971, 1975). Stratig-raphic considerations and other tectonic features of the area (including the

ACla Geologica Academiae Scienliarum Hungaricae 21, 1977

(I (0

;(.

,,-- "".,""'- " ", ..,.,- ..

RECONNAISSANCE OF THE OPHIOLITES 205

area of the S. Gemerides) allow for the alternative interpretation that the

ophiolites are located on (Tauern-type?) tectonic windows. This interpretation,

like the one of SZADECZKy-KAHDOSS (1971, 1975, 1976) naturally assumesthat the complexes were created by plate accretion at a mid-ocean ridge, and

later transported to a subduction zone, but does not necessarily identify thepresent positions of the ophiolites along the Darno megatectonic zone asmarking the site of the subduction. The plate-tectonic significance of the Darno

ophiolites and the associated Meliata series in the reconstruction of the Meso-

zoic - Cainozoic evolution of the Western Carpathian - Pannonian region is

discussed in details somewhere else (see: HORVATH, VOROS, ONUOHA, thisvolume).

ACKNOWLEDGEMENTS

The author is very grateful to F. HORVATHand K. SZEPESHAzYfor several stimulatingdiscussions of Alpine-Carpathian geology, and to P. MARTONfor guidance in paleomagneticwork.

REFERENCES

Annual Report of the Hungarian Geophysical Institute for 1972. Budapest, 29-32, 1973.BALOGH,K.: A,Biikk hegyseg foldtani kepzOdmenyei (Geological formations of the Biikk Mts).MAFI Evk., 48, 2, 1964.

BICKLE, M. J.-J. A. PEARCE: Oceanic mafic rocks in the Eastern Alps. Contrib. Mineral. Pet-rol.,49, 177-189, 1975.

CHANNELL,J. E. T.-F. HORVATH:The African/Adriatic promontory as a paleogeographicalpremise for Alpine orogeny and plate movements in the Carpatho-Balkan region.Tectonophysics, 35, 71-101, 1976.

COGULU, E.-M. DELALOYE-M. VUAGNAT-J. J. WAGNER: Some geochemical, geochronolog-ical and petrophysical data on the ophiolitic massiffrom the Kizil Dagh Hatay-Turkey.C. R. des Seances, SPHN Geneve, 10, 2-3, 141-150, 1975.

DANK, V.-I. BODZAY: Geohistorical background of the potential hydrocarbon reserves inHungary. Acta Mineral. Petrog., Szeged, 20,1,57-70,1971.

FOLDESSY, J.: Petrological study of a diabase-spilite magmatic rock suite, Darn6-hegy/Sirok,Hungary. G-eol. Ustav. D. Stura, Bratislava, 55-64, 1975.

HORVATH, F.-J. E. T. CHANNEL:Further evidence relevant to the African/Adriatic promon-tory as a palaeogeographic premise for alpine orogeny. In: BIJU-DUVAL, B.-L. MON-TADERT(ed.) Intern. Symposium on the structural history of the Mediterranean basins,Split, 1976, 133-142, Paris, Editions Technik, 1977.

KISS, J.: Ercfoldtani vizsgalatok a siroki Darn6-hegyen (Mineralogic-geological investigationsof Sirok's Mt Darn6). Foldtani Kozlony, 88, 27-41,1958.

KOZUR, H.-R. MOCK,: Conodonts and holothurian sclerites from the Upper Permian andTriassic of the Biikk Mts (North Hungary). Acta Mineral. Petrogr., Szeged, 23, 1,109-126, 1977.

LENGYEL, E.: A Szarvasko kornyeki titan-, vanadium-, vaserckutatas ujabb eredmenyei (Newerr,esults oftitanium-vanadium-iron ore prospecting in the area of Szarvasko). MAFIEvk., 46, 2, 251-381, 1957.

OBERHANSLI, R.- V. DIETRICH: Geochemische Untersuchungen an Metabasalten der alpinenOphiolithe. Schweiz. Mineral. Petrog. Mitt., 55, 3, 574-576, 1975.

ONUOHA, K. M.: Geofizikai vizsgalatok a Darn6-hegy teriileten (Geophysical investigations ofthe area of Mt Darn6). M. Sc. Thesis, Budapest, 1977.

ONUOHA, K. M.: Geophysical investigation of the ophiolites of the Darn6-line. Magyar Geo-fizika, 18, 5, 181-188. 1977a.

Acla Geologica Academiae Scienliarum Hungaricae 21, 1977

2D6 ONUOHA, K. M.

ONUOHA,K. M.: Tectonic significance of some geochemical data associated with the ophioliticcomplexes of the Darno megatectonic line (NE Hungary). Acta Geol. Acad. Sci. Hung.,(in press), 1977b.

PANTO, G.-M. FOLDVARI-VOG~.:Natron-gabbro a Bodva-volgyben (Sodium-gabbro from theBodva valley). MAFl Evk., 39, 3, 1950.

PEARCE, J. A.: Basalt geochemistry used to investigate past tectonic environments on Cyprus,Tectonophysics, 25, 41-67, 1975.

RAITH, M.-P. K. HORMANN-K. ABRAHAM:Petrology and metamorphic evolution of the Pen-ninic ophiolites in the western Tauern window (Austria). Schweiz. Mineral. Petrog. Mitt.,57, 187-232, 1977.

SEGUIN, M. K.: Reconnaissance paleomagnetic investigation of the ophiolitic complex. ThetfordMines, Asbestos, Quebec, Tectonophysics, 34, 231-243, 1976.

SZADECZKy-KARDOSS,E.: Mechanism of the new global tectonics and its relation to the evolu-tion of the Earth and Life. Geon. es Bany., 4, 1-89, 1971.

SZADECZKy-KARDOSS,E.: Plattentektonik im pannonisch-karpatischen Raum. Geol. Rund-schau, 65, 143, 1975.

SZADECZKy-KARDOSS,E.: A mediterran tipusu lemeztektonika (The Mediterranean-type plate-tectonics). MTA X. Osztalyanak Kozl., 9, 1-2,47-82, 1976.

SZENTPETERY, Zs.: A deli Biikkhegyseg diabaz es, gabbrotOmege (The diabasic and gabbroicmasses of the Southern Biikk Mts). MAFI Evk., 41, 1, 1-101, 1953.

SZEPESHAZY,K.: Az AlfOld mezozoos magmas kepzodmenyei (The Mesozoic igneous forma-tions of the Great Hungarian Plains). Foldtani KozlOny, 107, 2, 150-167, 1977.

VINE, F. J.-E. M. MOOREs: A model for the gross structure petrology and magnetic propertiesof oceanic crust. Geol. Soc. Am. Mem., 132, 195-205, 1972.

WEIN, Gy.: Tectonic review of the Neogene-covered areas of Hungary. Acta Geol. Acad. Sci.Hung., 13, 1-4, 396-435, 1969.

ZELENKA, T.: A recski melyszinti szinesfemerc elOfordulas szerkezeti-magmafoldtani helyzete(Structural-igneous setting of the deep-seated base metal ore deposit of Recsk). Fold-tani Kozlony, 105, (Supplementum), 582-597, 1975.

rEO<l>113114ECl{l1E 11 rEOXl1M114ECl{l1E l1CCJIE):{OBAHl15I O<l>110JIl1TOB):{EPHOBCl{OVt rEOTEl{TOH114ECl{OVt JIl1Hl1l1

(CB BeHrpH5I)

K.M.OHYOXA

Pe310Me

Pe3YJIbTaTbI neTpOWH3H'IeCKHX, reOXHMH'IeCKHX H nOJIeBOMarHHTHbIX HCCJIe,':\OBaHHHnpo-Be,':\eHHbIx Ha MaWH'IeCKHX H YJIbTpaMaWH'IeCKHX 06pa30BaHH5Ix HaXO,':\5IIl\HC5IB,':\OJIb):{apHOB-CKoro JIHHeaMeHTa nOKa3bIBalOT Ha HX TeCHoe reHeTH'IeCKOe CXO,':\CTBOC no,':\06HbIMH 06pa30Ba-HH5IMH, H3BeCTHbIMH B ,':\pyrHx paHoHax AJIbnHHCKo-cpe.n;HH3eMHoMopCKOH OIOJIaCTH. no reo-XHMH'IeCKHM ,':\aHHbIM, nepBOHa'laJIbHa51 6a3aJIbTOBa51 MarMa BbIJIa TOJIeHTOrO THna; ee TpeH,':\bI,':\HwwepeHl~HpOBaHH5I, wpaK~HOHHpOBaHH5I XOpOIIlO COCTBeTcTBylOTTeM a6HCCaJIbHbIX TOJIeHTOBOKeaHcKoro ,':\Ha. 9TO MHeHHe nO,':\TBep)l{,':\aeTC5ITaK)I{e OTHOIIleHH5IMHYjNb, Ti- Cr H OIOIl\HMXHMH'IeCKHM COCTaBOM.TaKHM 06pa30M 3TH MarMaTH'IeCKHe nopO,':\bI He MorYT BbITb Me)l{nJIHTO-BbIMH 06pa30BaHH5IMH, B03HHKIIlHMH Ha MeCTe BCJIe,':\CTBHHMarMaTH3Ma. Ha,':\ 3TOH TOJIIl\H 06Ha-PY)l{HJIHCb OTpH~aTeJIbHbIe MarHHTHbIe aHOMaJIHH (LIZ, LIT); HHTepnpeTa~HoHHbIe Mo,':\eJIH ro-BOp5lT 3a aJIJIOXTOHHbIe nOJIO)l{eHHe 3THX CBHT. MarHHTHbIe oc06eHHocTH ,':\BYXe,':\HHH~ H3Y'Iae-MOH TOJIIl\H (,':\Ha6a30B H ra66po) cpaBHHBaIOTC5I C no.n;o6HbIMH e,':\HHH~aMH ,':\pyrnx OWHOJIHTOB,HO no npe,':\BopHTeJIbHbIM ,':\aHHbIM 3TH nopO,':\bI e,':\Ba JIll nO,':\XO,':\5IT,':\JI5I no,':\po6HbIX naJIeo-MarHHTHbIX HCCJIe,':\OBaHHH,H3-3a 3wweKTOB ,':\eHCTBH5IMOJIO.n;OroTeKTOHH3Ma.

Acta Gcologica Academioe Scientiarum Hangaricae 21, 1977

(1 cr

(cD>

Reviews of the Hungarian Academy of Sciences are obtainable. at the following addresses:

ALBANIA

Dreilorija Ql1ndrone e Pahapjes

dhe Propagandimilla Libril

Kruga Konferenca a PazesTirana

AUSTRALIA

A. KeesingBox 4886, GPOSydney

AUSTRIA

GlobusHechsladlplalz 3A-/200 Wien XX

BELGIUM

Office Infernalional de Librairie

30, Avenue MarnixBruxel/es 5

Du Monde Enlier

S, Place 51. JeanBruxelles

BULGARIA

Hemus

11 pi Siaveikov

Sofia

CANADA

Pannonia Books

2, Spadina Road

Toronto 'I, ant.

CHINA

Waiwen Shudia..PekingP. O. B. 88

CZECHOSLOVAKIA

Artia

Ve SmUkach 30Proho 2

Poslovn! Noviniva

Dovoz lisku

Vinohradska 46

Proho 2

Mad'arska Kultura

Proho 2

Vaclovske nam. 2

Proho /Siovart A. G.

GorkehoBrotis/ovo

luiba

DENMARK

Ejnar Munksgaadr

Nerregade 6

Copeoho.;e

FINLAND

Akaleeminen KirjakauppaKeskuskalu 2He/sinki

FRANCE

Office Inlernalional de Documenlalionel Librairie

48, rue Gay-LussacParis 5

GERMAN DEMOCRATIC REPUBLIC

Deulscher Buch-Exporl und ImparlLeninsiraBe 16

Leipzig 701

ZeilungsvertriebsamlFruchtslraBe 3-4

/004 Bulin

GERMAN FEDERAL REPUBLIC

Kunsl und Wissen

Er" h 8ieber

Posllach 46

7 Stuttgart S.

GREAT BRITAIN

Blackwell's Periodicais

Oxenford House

. Magdalen SireelOxford

Collel's Subscriplion Import

DepartmenlDen inglon Eslale

Wellingsborough. NorthontS.Robert Maxwell and Co. Ltd.

4-S Fitzroy SquareLandon W.

HOLLAND

Swelz and Zeillinger

KeizersgrachI471-478Amsterdam C.

Martinus Nijhof

Lanse Voorhoul9

The Hogue

INDIA

Hind Bc~k House

66 Babar Road

New De/hi /

ITALY

Sanlo Vanasia

Via M. Macchi 71

MilanoLibraria Commissionaria Sansoni

Via La Marmara 'IS

Firenze

JAPAN

Kinokuniya Book-Store Co. Lt~.826 Tsunohazu 1-chame

Shinjuku-ku

TokyoMaruzen and Co. Ltd.P. O. Box 60S

Tokyo-Central

KOREA

ChulpanmulPhenjan

NORWAY

Tanum-CammermeyerKari Johansgt 41-43Oslo /

POLAND

RUCH

ul. Wronia 23Worszowo

ROUMANIA

CartimexSIr. Arislide Briand 14-18Bucurelti

SOVIET UNION

Mezhdunarodnaya KnigaMoscow G-200

SWEDEN

Almquisl and WiksellGamla Brogalan 26S - 101 20 Stockholm

USA

F. W. Faxon Co. Inc.

1S Soulhwesl Park

Westwood, Moss. 02090Slechert Ha/ner Inc.31. Easl10th Sireel

New York. N. Y. /0003

VIETNAt1

Xunhasaba19, Tran Quoc ToanHanoi

YUGOSLAVIA

Forum

Vojvode Misi~a broi 1Novi Sod

Jugoslavenska Knjiga

Terozije 27Beograd